TextureTest.cpp

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Author : Jamie Madill
Date : 2016-12-13 12:42:14
Hash : e1faacb1
Message : Don't use logging macros in end2end_tests. Macros like ASSERT and UNREACHABLE call gl::trace, which at some point we might want to use to call the angle Platform logging code. Standalone tests won't easily have access to the platform, so for now just log errors in other ways. This also corrects some logic in GLSLTest which was calling internal methods in libANGLE when it didn't have to. BUG=angleproject:1660 Change-Id: Idecbd97f2de7916b35bd78f5b7cd02b156ea100d Reviewed-on: https://chromium-review.googlesource.com/419134 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>
src/tests/gl_tests/TextureTest.cpp
//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

#include "common/mathutil.h"
#include "test_utils/ANGLETest.h"
#include "test_utils/gl_raii.h"

using namespace angle;

namespace
{

// Take a pixel, and reset the components not covered by the format to default
// values. In particular, the default value for the alpha component is 255
// (1.0 as unsigned normalized fixed point value).
GLColor SliceFormatColor(GLenum format, GLColor full)
{
    switch (format)
    {
        case GL_RED:
            return GLColor(full.R, 0, 0, 255u);
        case GL_RG:
            return GLColor(full.R, full.G, 0, 255u);
        case GL_RGB:
            return GLColor(full.R, full.G, full.B, 255u);
        case GL_RGBA:
            return full;
        default:
            EXPECT_TRUE(false);
            return GLColor::white;
    }
}

class TexCoordDrawTest : public ANGLETest
{
  protected:
    TexCoordDrawTest() : ANGLETest(), mProgram(0), mFramebuffer(0), mFramebufferColorTexture(0)
    {
        setWindowWidth(128);
        setWindowHeight(128);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
    }

    virtual std::string getVertexShaderSource()
    {
        return std::string(SHADER_SOURCE
        (
            precision highp float;
            attribute vec4 position;
            varying vec2 texcoord;

            void main()
            {
                gl_Position = vec4(position.xy, 0.0, 1.0);
                texcoord = (position.xy * 0.5) + 0.5;
            }
        )
        );
    }

    virtual std::string getFragmentShaderSource() = 0;

    virtual void setUpProgram()
    {
        const std::string vertexShaderSource   = getVertexShaderSource();
        const std::string fragmentShaderSource = getFragmentShaderSource();

        mProgram = CompileProgram(vertexShaderSource, fragmentShaderSource);
        ASSERT_NE(0u, mProgram);
        ASSERT_GL_NO_ERROR();
    }

    void SetUp() override
    {
        ANGLETest::SetUp();

        setUpFramebuffer();
    }

    void TearDown() override
    {
        glBindFramebuffer(GL_FRAMEBUFFER, 0);
        glDeleteFramebuffers(1, &mFramebuffer);
        glDeleteTextures(1, &mFramebufferColorTexture);
        glDeleteProgram(mProgram);
        ANGLETest::TearDown();
    }

    void setUpFramebuffer()
    {
        // We use an FBO to work around an issue where the default framebuffer applies SRGB
        // conversion (particularly known to happen incorrectly on Intel GL drivers). It's not
        // clear whether this issue can even be fixed on all backends. For example GLES 3.0.4 spec
        // section 4.4 says that the format of the default framebuffer is entirely up to the window
        // system, so it might be SRGB, and GLES 3.0 doesn't have a "FRAMEBUFFER_SRGB" to turn off
        // SRGB conversion like desktop GL does.
        // TODO(oetuaho): Get rid of this if the underlying issue is fixed.
        glGenFramebuffers(1, &mFramebuffer);
        glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer);

        glGenTextures(1, &mFramebufferColorTexture);
        glBindTexture(GL_TEXTURE_2D, mFramebufferColorTexture);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 0, GL_RGBA,
                     GL_UNSIGNED_BYTE, nullptr);
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                               mFramebufferColorTexture, 0);
        ASSERT_GL_NO_ERROR();
        ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
        glBindTexture(GL_TEXTURE_2D, 0);
    }

    // Returns the created texture ID.
    GLuint create2DTexture()
    {
        GLuint texture2D;
        glGenTextures(1, &texture2D);
        glBindTexture(GL_TEXTURE_2D, texture2D);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
        EXPECT_GL_NO_ERROR();
        return texture2D;
    }

    GLuint mProgram;
    GLuint mFramebuffer;

  private:
    GLuint mFramebufferColorTexture;
};

class Texture2DTest : public TexCoordDrawTest
{
  protected:
    Texture2DTest() : TexCoordDrawTest(), mTexture2D(0), mTexture2DUniformLocation(-1) {}

    std::string getFragmentShaderSource() override
    {
        return std::string(SHADER_SOURCE
        (
            precision highp float;
            uniform sampler2D tex;
            varying vec2 texcoord;

            void main()
            {
                gl_FragColor = texture2D(tex, texcoord);
            }
        )
        );
    }

    virtual const char *getTextureUniformName() { return "tex"; }

    void setUpProgram() override
    {
        TexCoordDrawTest::setUpProgram();
        mTexture2DUniformLocation = glGetUniformLocation(mProgram, getTextureUniformName());
        ASSERT_NE(-1, mTexture2DUniformLocation);
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();
        mTexture2D = create2DTexture();

        ASSERT_GL_NO_ERROR();
    }

    void TearDown() override
    {
        glDeleteTextures(1, &mTexture2D);
        TexCoordDrawTest::TearDown();
    }

    // Tests CopyTexSubImage with floating point textures of various formats.
    void testFloatCopySubImage(int sourceImageChannels, int destImageChannels)
    {
        // TODO(jmadill): Figure out why this is broken on Intel D3D11
        if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE)
        {
            std::cout << "Test skipped on Intel D3D11." << std::endl;
            return;
        }

        setUpProgram();

        if (getClientMajorVersion() < 3)
        {
            if (!extensionEnabled("GL_OES_texture_float"))
            {
                std::cout << "Test skipped due to missing GL_OES_texture_float." << std::endl;
                return;
            }

            if ((sourceImageChannels < 3 || destImageChannels < 3) && !extensionEnabled("GL_EXT_texture_rg"))
            {
                std::cout << "Test skipped due to missing GL_EXT_texture_rg." << std::endl;
                return;
            }
        }

        GLfloat sourceImageData[4][16] =
        {
            { // R
                1.0f,
                0.0f,
                0.0f,
                1.0f
            },
            { // RG
                1.0f, 0.0f,
                0.0f, 1.0f,
                0.0f, 0.0f,
                1.0f, 1.0f
            },
            { // RGB
                1.0f, 0.0f, 0.0f,
                0.0f, 1.0f, 0.0f,
                0.0f, 0.0f, 1.0f,
                1.0f, 1.0f, 0.0f
            },
            { // RGBA
                1.0f, 0.0f, 0.0f, 1.0f,
                0.0f, 1.0f, 0.0f, 1.0f,
                0.0f, 0.0f, 1.0f, 1.0f,
                1.0f, 1.0f, 0.0f, 1.0f
            },
        };

        GLenum imageFormats[] =
        {
            GL_R32F,
            GL_RG32F,
            GL_RGB32F,
            GL_RGBA32F,
        };

        GLenum sourceUnsizedFormats[] =
        {
            GL_RED,
            GL_RG,
            GL_RGB,
            GL_RGBA,
        };

        GLuint textures[2];

        glGenTextures(2, textures);

        GLfloat *imageData = sourceImageData[sourceImageChannels - 1];
        GLenum sourceImageFormat = imageFormats[sourceImageChannels - 1];
        GLenum sourceUnsizedFormat = sourceUnsizedFormats[sourceImageChannels - 1];
        GLenum destImageFormat = imageFormats[destImageChannels - 1];

        glBindTexture(GL_TEXTURE_2D, textures[0]);
        glTexStorage2DEXT(GL_TEXTURE_2D, 1, sourceImageFormat, 2, 2);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 2, 2, sourceUnsizedFormat, GL_FLOAT, imageData);

        if (sourceImageChannels < 3 && !extensionEnabled("GL_EXT_texture_rg"))
        {
            // This is not supported
            ASSERT_GL_ERROR(GL_INVALID_OPERATION);
        }
        else
        {
            ASSERT_GL_NO_ERROR();
        }

        GLuint fbo;
        glGenFramebuffers(1, &fbo);
        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textures[0], 0);

        glBindTexture(GL_TEXTURE_2D, textures[1]);
        glTexStorage2DEXT(GL_TEXTURE_2D, 1, destImageFormat, 2, 2);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, 2, 2);
        ASSERT_GL_NO_ERROR();

        glBindFramebuffer(GL_FRAMEBUFFER, 0);
        drawQuad(mProgram, "position", 0.5f);

        int testImageChannels = std::min(sourceImageChannels, destImageChannels);

        EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
        if (testImageChannels > 1)
        {
            EXPECT_PIXEL_EQ(getWindowHeight() - 1, 0, 0, 255, 0, 255);
            EXPECT_PIXEL_EQ(getWindowHeight() - 1, getWindowWidth() - 1, 255, 255, 0, 255);
            if (testImageChannels > 2)
            {
                EXPECT_PIXEL_EQ(0, getWindowWidth() - 1, 0, 0, 255, 255);
            }
        }

        glDeleteFramebuffers(1, &fbo);
        glDeleteTextures(2, textures);

        ASSERT_GL_NO_ERROR();
    }

    GLuint mTexture2D;
    GLint mTexture2DUniformLocation;
};

class Texture2DTestES3 : public Texture2DTest
{
  protected:
    Texture2DTestES3() : Texture2DTest() {}

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "out vec2 texcoord;\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp sampler2D tex;\n"
            "in vec2 texcoord;\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    fragColor = texture(tex, texcoord);\n"
            "}\n");
    }

    void SetUp() override
    {
        Texture2DTest::SetUp();
        setUpProgram();
    }
};

class Texture2DIntegerAlpha1TestES3 : public Texture2DTest
{
  protected:
    Texture2DIntegerAlpha1TestES3() : Texture2DTest() {}

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "out vec2 texcoord;\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp isampler2D tex;\n"
            "in vec2 texcoord;\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    vec4 green = vec4(0, 1, 0, 1);\n"
            "    vec4 black = vec4(0, 0, 0, 0);\n"
            "    fragColor = (texture(tex, texcoord).a == 1) ? green : black;\n"
            "}\n");
    }

    void SetUp() override
    {
        Texture2DTest::SetUp();
        setUpProgram();
    }
};

class Texture2DUnsignedIntegerAlpha1TestES3 : public Texture2DTest
{
  protected:
    Texture2DUnsignedIntegerAlpha1TestES3() : Texture2DTest() {}

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "out vec2 texcoord;\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp usampler2D tex;\n"
            "in vec2 texcoord;\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    vec4 green = vec4(0, 1, 0, 1);\n"
            "    vec4 black = vec4(0, 0, 0, 0);\n"
            "    fragColor = (texture(tex, texcoord).a == 1u) ? green : black;\n"
            "}\n");
    }

    void SetUp() override
    {
        Texture2DTest::SetUp();
        setUpProgram();
    }
};

class Texture2DTestWithDrawScale : public Texture2DTest
{
  protected:
    Texture2DTestWithDrawScale() : Texture2DTest(), mDrawScaleUniformLocation(-1) {}

    std::string getVertexShaderSource() override
    {
        return std::string(SHADER_SOURCE
        (
            precision highp float;
            attribute vec4 position;
            varying vec2 texcoord;

            uniform vec2 drawScale;

            void main()
            {
                gl_Position = vec4(position.xy * drawScale, 0.0, 1.0);
                texcoord = (position.xy * 0.5) + 0.5;
            }
        )
        );
    }

    void SetUp() override
    {
        Texture2DTest::SetUp();

        setUpProgram();

        mDrawScaleUniformLocation = glGetUniformLocation(mProgram, "drawScale");
        ASSERT_NE(-1, mDrawScaleUniformLocation);

        glUseProgram(mProgram);
        glUniform2f(mDrawScaleUniformLocation, 1.0f, 1.0f);
        glUseProgram(0);
        ASSERT_GL_NO_ERROR();
    }

    GLint mDrawScaleUniformLocation;
};

class Sampler2DAsFunctionParameterTest : public Texture2DTest
{
  protected:
    Sampler2DAsFunctionParameterTest() : Texture2DTest() {}

    std::string getFragmentShaderSource() override
    {
        return std::string(SHADER_SOURCE
        (
            precision highp float;
            uniform sampler2D tex;
            varying vec2 texcoord;

            vec4 computeFragColor(sampler2D aTex)
            {
                return texture2D(aTex, texcoord);
            }

            void main()
            {
                gl_FragColor = computeFragColor(tex);
            }
        )
        );
    }

    void SetUp() override
    {
        Texture2DTest::SetUp();
        setUpProgram();
    }
};

class TextureCubeTest : public TexCoordDrawTest
{
  protected:
    TextureCubeTest()
        : TexCoordDrawTest(),
          mTexture2D(0),
          mTextureCube(0),
          mTexture2DUniformLocation(-1),
          mTextureCubeUniformLocation(-1)
    {
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(SHADER_SOURCE
        (
            precision highp float;
            uniform sampler2D tex2D;
            uniform samplerCube texCube;
            varying vec2 texcoord;

            void main()
            {
                gl_FragColor = texture2D(tex2D, texcoord);
                gl_FragColor += textureCube(texCube, vec3(texcoord, 0));
            }
        )
        );
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();

        glGenTextures(1, &mTextureCube);
        glBindTexture(GL_TEXTURE_CUBE_MAP, mTextureCube);
        glTexStorage2DEXT(GL_TEXTURE_CUBE_MAP, 1, GL_RGBA8, 1, 1);
        EXPECT_GL_NO_ERROR();

        mTexture2D = create2DTexture();

        setUpProgram();

        mTexture2DUniformLocation = glGetUniformLocation(mProgram, "tex2D");
        ASSERT_NE(-1, mTexture2DUniformLocation);
        mTextureCubeUniformLocation = glGetUniformLocation(mProgram, "texCube");
        ASSERT_NE(-1, mTextureCubeUniformLocation);
    }

    void TearDown() override
    {
        glDeleteTextures(1, &mTextureCube);
        TexCoordDrawTest::TearDown();
    }

    GLuint mTexture2D;
    GLuint mTextureCube;
    GLint mTexture2DUniformLocation;
    GLint mTextureCubeUniformLocation;
};

class SamplerArrayTest : public TexCoordDrawTest
{
  protected:
    SamplerArrayTest()
        : TexCoordDrawTest(),
          mTexture2DA(0),
          mTexture2DB(0),
          mTexture0UniformLocation(-1),
          mTexture1UniformLocation(-1)
    {
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(SHADER_SOURCE
        (
            precision mediump float;
            uniform highp sampler2D tex2DArray[2];
            varying vec2 texcoord;
            void main()
            {
                gl_FragColor = texture2D(tex2DArray[0], texcoord);
                gl_FragColor += texture2D(tex2DArray[1], texcoord);
            }
        )
        );
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();

        setUpProgram();

        mTexture0UniformLocation = glGetUniformLocation(mProgram, "tex2DArray[0]");
        ASSERT_NE(-1, mTexture0UniformLocation);
        mTexture1UniformLocation = glGetUniformLocation(mProgram, "tex2DArray[1]");
        ASSERT_NE(-1, mTexture1UniformLocation);

        mTexture2DA = create2DTexture();
        mTexture2DB = create2DTexture();
        ASSERT_GL_NO_ERROR();
    }

    void TearDown() override
    {
        glDeleteTextures(1, &mTexture2DA);
        glDeleteTextures(1, &mTexture2DB);
        TexCoordDrawTest::TearDown();
    }

    void testSamplerArrayDraw()
    {
        GLubyte texData[4];
        texData[0] = 0;
        texData[1] = 60;
        texData[2] = 0;
        texData[3] = 255;

        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, mTexture2DA);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, texData);

        texData[1] = 120;
        glActiveTexture(GL_TEXTURE1);
        glBindTexture(GL_TEXTURE_2D, mTexture2DB);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, texData);
        EXPECT_GL_ERROR(GL_NO_ERROR);

        glUseProgram(mProgram);
        glUniform1i(mTexture0UniformLocation, 0);
        glUniform1i(mTexture1UniformLocation, 1);
        drawQuad(mProgram, "position", 0.5f);
        EXPECT_GL_NO_ERROR();

        EXPECT_PIXEL_NEAR(0, 0, 0, 180, 0, 255, 2);
    }

    GLuint mTexture2DA;
    GLuint mTexture2DB;
    GLint mTexture0UniformLocation;
    GLint mTexture1UniformLocation;
};


class SamplerArrayAsFunctionParameterTest : public SamplerArrayTest
{
  protected:
    SamplerArrayAsFunctionParameterTest() : SamplerArrayTest() {}

    std::string getFragmentShaderSource() override
    {
        return std::string(SHADER_SOURCE
        (
            precision mediump float;
            uniform highp sampler2D tex2DArray[2];
            varying vec2 texcoord;

            vec4 computeFragColor(highp sampler2D aTex2DArray[2])
            {
                return texture2D(aTex2DArray[0], texcoord) + texture2D(aTex2DArray[1], texcoord);
            }

            void main()
            {
                gl_FragColor = computeFragColor(tex2DArray);
            }
        )
        );
    }
};

class Texture2DArrayTestES3 : public TexCoordDrawTest
{
  protected:
    Texture2DArrayTestES3() : TexCoordDrawTest(), m2DArrayTexture(0), mTextureArrayLocation(-1) {}

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "out vec2 texcoord;\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp sampler2DArray tex2DArray;\n"
            "in vec2 texcoord;\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    fragColor = texture(tex2DArray, vec3(texcoord.x, texcoord.y, 0.0));\n"
            "}\n");
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();

        setUpProgram();

        mTextureArrayLocation = glGetUniformLocation(mProgram, "tex2DArray");
        ASSERT_NE(-1, mTextureArrayLocation);

        glGenTextures(1, &m2DArrayTexture);
        ASSERT_GL_NO_ERROR();
    }

    void TearDown() override
    {
        glDeleteTextures(1, &m2DArrayTexture);
        TexCoordDrawTest::TearDown();
    }

    GLuint m2DArrayTexture;
    GLint mTextureArrayLocation;
};

class TextureSizeTextureArrayTest : public TexCoordDrawTest
{
  protected:
    TextureSizeTextureArrayTest()
        : TexCoordDrawTest(),
          mTexture2DA(0),
          mTexture2DB(0),
          mTexture0Location(-1),
          mTexture1Location(-1)
    {
    }

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp sampler2D tex2DArray[2];\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    float red = float(textureSize(tex2DArray[0], 0).x) / 255.0;\n"
            "    float green = float(textureSize(tex2DArray[1], 0).x) / 255.0;\n"
            "    fragColor = vec4(red, green, 0.0, 1.0);\n"
            "}\n");
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();

        setUpProgram();

        mTexture0Location = glGetUniformLocation(mProgram, "tex2DArray[0]");
        ASSERT_NE(-1, mTexture0Location);
        mTexture1Location = glGetUniformLocation(mProgram, "tex2DArray[1]");
        ASSERT_NE(-1, mTexture1Location);

        mTexture2DA = create2DTexture();
        mTexture2DB = create2DTexture();
        ASSERT_GL_NO_ERROR();
    }

    void TearDown() override
    {
        glDeleteTextures(1, &mTexture2DA);
        glDeleteTextures(1, &mTexture2DB);
        TexCoordDrawTest::TearDown();
    }

    GLuint mTexture2DA;
    GLuint mTexture2DB;
    GLint mTexture0Location;
    GLint mTexture1Location;
};

class Texture3DTestES3 : public TexCoordDrawTest
{
  protected:
    Texture3DTestES3() : TexCoordDrawTest(), mTexture3D(0), mTexture3DUniformLocation(-1) {}

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "out vec2 texcoord;\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp sampler3D tex3D;\n"
            "in vec2 texcoord;\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    fragColor = texture(tex3D, vec3(texcoord, 0.0));\n"
            "}\n");
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();

        glGenTextures(1, &mTexture3D);

        setUpProgram();

        mTexture3DUniformLocation = glGetUniformLocation(mProgram, "tex3D");
        ASSERT_NE(-1, mTexture3DUniformLocation);
    }

    void TearDown() override
    {
        glDeleteTextures(1, &mTexture3D);
        TexCoordDrawTest::TearDown();
    }

    GLuint mTexture3D;
    GLint mTexture3DUniformLocation;
};

class ShadowSamplerPlusSampler3DTestES3 : public TexCoordDrawTest
{
  protected:
    ShadowSamplerPlusSampler3DTestES3()
        : TexCoordDrawTest(),
          mTextureShadow(0),
          mTexture3D(0),
          mTextureShadowUniformLocation(-1),
          mTexture3DUniformLocation(-1),
          mDepthRefUniformLocation(-1)
    {
    }

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "out vec2 texcoord;\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp sampler2DShadow tex2DShadow;\n"
            "uniform highp sampler3D tex3D;\n"
            "in vec2 texcoord;\n"
            "uniform float depthRef;\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    fragColor = vec4(texture(tex2DShadow, vec3(texcoord, depthRef)) * 0.5);\n"
            "    fragColor += texture(tex3D, vec3(texcoord, 0.0));\n"
            "}\n");
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();

        glGenTextures(1, &mTexture3D);

        glGenTextures(1, &mTextureShadow);
        glBindTexture(GL_TEXTURE_2D, mTextureShadow);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);

        setUpProgram();

        mTextureShadowUniformLocation = glGetUniformLocation(mProgram, "tex2DShadow");
        ASSERT_NE(-1, mTextureShadowUniformLocation);
        mTexture3DUniformLocation = glGetUniformLocation(mProgram, "tex3D");
        ASSERT_NE(-1, mTexture3DUniformLocation);
        mDepthRefUniformLocation = glGetUniformLocation(mProgram, "depthRef");
        ASSERT_NE(-1, mDepthRefUniformLocation);
    }

    void TearDown() override
    {
        glDeleteTextures(1, &mTextureShadow);
        glDeleteTextures(1, &mTexture3D);
        TexCoordDrawTest::TearDown();
    }

    GLuint mTextureShadow;
    GLuint mTexture3D;
    GLint mTextureShadowUniformLocation;
    GLint mTexture3DUniformLocation;
    GLint mDepthRefUniformLocation;
};

class SamplerTypeMixTestES3 : public TexCoordDrawTest
{
  protected:
    SamplerTypeMixTestES3()
        : TexCoordDrawTest(),
          mTexture2D(0),
          mTextureCube(0),
          mTexture2DShadow(0),
          mTextureCubeShadow(0),
          mTexture2DUniformLocation(-1),
          mTextureCubeUniformLocation(-1),
          mTexture2DShadowUniformLocation(-1),
          mTextureCubeShadowUniformLocation(-1),
          mDepthRefUniformLocation(-1)
    {
    }

    std::string getVertexShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "out vec2 texcoord;\n"
            "in vec4 position;\n"
            "void main()\n"
            "{\n"
            "    gl_Position = vec4(position.xy, 0.0, 1.0);\n"
            "    texcoord = (position.xy * 0.5) + 0.5;\n"
            "}\n");
    }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "#version 300 es\n"
            "precision highp float;\n"
            "uniform highp sampler2D tex2D;\n"
            "uniform highp samplerCube texCube;\n"
            "uniform highp sampler2DShadow tex2DShadow;\n"
            "uniform highp samplerCubeShadow texCubeShadow;\n"
            "in vec2 texcoord;\n"
            "uniform float depthRef;\n"
            "out vec4 fragColor;\n"
            "void main()\n"
            "{\n"
            "    fragColor = texture(tex2D, texcoord);\n"
            "    fragColor += texture(texCube, vec3(1.0, 0.0, 0.0));\n"
            "    fragColor += vec4(texture(tex2DShadow, vec3(texcoord, depthRef)) * 0.25);\n"
            "    fragColor += vec4(texture(texCubeShadow, vec4(1.0, 0.0, 0.0, depthRef)) * "
            "0.125);\n"
            "}\n");
    }

    void SetUp() override
    {
        TexCoordDrawTest::SetUp();

        glGenTextures(1, &mTexture2D);
        glGenTextures(1, &mTextureCube);

        glGenTextures(1, &mTexture2DShadow);
        glBindTexture(GL_TEXTURE_2D, mTexture2DShadow);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);

        glGenTextures(1, &mTextureCubeShadow);
        glBindTexture(GL_TEXTURE_CUBE_MAP, mTextureCubeShadow);
        glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);

        setUpProgram();

        mTexture2DUniformLocation = glGetUniformLocation(mProgram, "tex2D");
        ASSERT_NE(-1, mTexture2DUniformLocation);
        mTextureCubeUniformLocation = glGetUniformLocation(mProgram, "texCube");
        ASSERT_NE(-1, mTextureCubeUniformLocation);
        mTexture2DShadowUniformLocation = glGetUniformLocation(mProgram, "tex2DShadow");
        ASSERT_NE(-1, mTexture2DShadowUniformLocation);
        mTextureCubeShadowUniformLocation = glGetUniformLocation(mProgram, "texCubeShadow");
        ASSERT_NE(-1, mTextureCubeShadowUniformLocation);
        mDepthRefUniformLocation = glGetUniformLocation(mProgram, "depthRef");
        ASSERT_NE(-1, mDepthRefUniformLocation);

        ASSERT_GL_NO_ERROR();
    }

    void TearDown() override
    {
        glDeleteTextures(1, &mTexture2D);
        glDeleteTextures(1, &mTextureCube);
        glDeleteTextures(1, &mTexture2DShadow);
        glDeleteTextures(1, &mTextureCubeShadow);
        TexCoordDrawTest::TearDown();
    }

    GLuint mTexture2D;
    GLuint mTextureCube;
    GLuint mTexture2DShadow;
    GLuint mTextureCubeShadow;
    GLint mTexture2DUniformLocation;
    GLint mTextureCubeUniformLocation;
    GLint mTexture2DShadowUniformLocation;
    GLint mTextureCubeShadowUniformLocation;
    GLint mDepthRefUniformLocation;
};

class SamplerInStructTest : public Texture2DTest
{
  protected:
    SamplerInStructTest() : Texture2DTest() {}

    const char *getTextureUniformName() override { return "us.tex"; }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "precision highp float;\n"
            "struct S\n"
            "{\n"
            "    vec4 a;\n"
            "    highp sampler2D tex;\n"
            "};\n"
            "uniform S us;\n"
            "varying vec2 texcoord;\n"
            "void main()\n"
            "{\n"
            "    gl_FragColor = texture2D(us.tex, texcoord + us.a.x);\n"
            "}\n");
    }

    void runSamplerInStructTest()
    {
        setUpProgram();

        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, mTexture2D);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                     &GLColor::green);
        drawQuad(mProgram, "position", 0.5f);
        EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    }
};

class SamplerInStructAsFunctionParameterTest : public SamplerInStructTest
{
  protected:
    SamplerInStructAsFunctionParameterTest() : SamplerInStructTest() {}

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "precision highp float;\n"
            "struct S\n"
            "{\n"
            "    vec4 a;\n"
            "    highp sampler2D tex;\n"
            "};\n"
            "uniform S us;\n"
            "varying vec2 texcoord;\n"
            "vec4 sampleFrom(S s) {\n"
            "    return texture2D(s.tex, texcoord + s.a.x);\n"
            "}\n"
            "void main()\n"
            "{\n"
            "    gl_FragColor = sampleFrom(us);\n"
            "}\n");
    }
};

class SamplerInStructArrayAsFunctionParameterTest : public SamplerInStructTest
{
  protected:
    SamplerInStructArrayAsFunctionParameterTest() : SamplerInStructTest() {}

    const char *getTextureUniformName() override { return "us[0].tex"; }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "precision highp float;\n"
            "struct S\n"
            "{\n"
            "    vec4 a;\n"
            "    highp sampler2D tex;\n"
            "};\n"
            "uniform S us[1];\n"
            "varying vec2 texcoord;\n"
            "vec4 sampleFrom(S s) {\n"
            "    return texture2D(s.tex, texcoord + s.a.x);\n"
            "}\n"
            "void main()\n"
            "{\n"
            "    gl_FragColor = sampleFrom(us[0]);\n"
            "}\n");
    }
};

class SamplerInNestedStructAsFunctionParameterTest : public SamplerInStructTest
{
  protected:
    SamplerInNestedStructAsFunctionParameterTest() : SamplerInStructTest() {}

    const char *getTextureUniformName() override { return "us[0].sub.tex"; }

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "precision highp float;\n"
            "struct SUB\n"
            "{\n"
            "    vec4 a;\n"
            "    highp sampler2D tex;\n"
            "};\n"
            "struct S\n"
            "{\n"
            "    SUB sub;\n"
            "};\n"
            "uniform S us[1];\n"
            "varying vec2 texcoord;\n"
            "vec4 sampleFrom(SUB s) {\n"
            "    return texture2D(s.tex, texcoord + s.a.x);\n"
            "}\n"
            "void main()\n"
            "{\n"
            "    gl_FragColor = sampleFrom(us[0].sub);\n"
            "}\n");
    }
};

class SamplerInStructAndOtherVariableTest : public SamplerInStructTest
{
  protected:
    SamplerInStructAndOtherVariableTest() : SamplerInStructTest() {}

    std::string getFragmentShaderSource() override
    {
        return std::string(
            "precision highp float;\n"
            "struct S\n"
            "{\n"
            "    vec4 a;\n"
            "    highp sampler2D tex;\n"
            "};\n"
            "uniform S us;\n"
            "uniform float us_tex;\n"
            "varying vec2 texcoord;\n"
            "void main()\n"
            "{\n"
            "    gl_FragColor = texture2D(us.tex, texcoord + us.a.x + us_tex);\n"
            "}\n");
    }
};

TEST_P(Texture2DTest, NegativeAPISubImage)
{
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    EXPECT_GL_ERROR(GL_NO_ERROR);

    setUpProgram();

    const GLubyte *pixels[20] = { 0 };
    glTexSubImage2D(GL_TEXTURE_2D, 0, 1, 1, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
    EXPECT_GL_ERROR(GL_INVALID_VALUE);

    if (extensionEnabled("GL_EXT_texture_storage"))
    {
        // Create a 1-level immutable texture.
        glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8, 2, 2);

        // Try calling sub image on the second level.
        glTexSubImage2D(GL_TEXTURE_2D, 1, 1, 1, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
        EXPECT_GL_ERROR(GL_INVALID_OPERATION);
    }
}

// Test that querying GL_TEXTURE_BINDING* doesn't cause an unexpected error.
TEST_P(Texture2DTest, QueryBinding)
{
    glBindTexture(GL_TEXTURE_2D, 0);
    EXPECT_GL_ERROR(GL_NO_ERROR);

    GLint textureBinding;
    glGetIntegerv(GL_TEXTURE_BINDING_2D, &textureBinding);
    EXPECT_GL_NO_ERROR();
    EXPECT_EQ(0, textureBinding);

    glGetIntegerv(GL_TEXTURE_BINDING_EXTERNAL_OES, &textureBinding);
    if (extensionEnabled("GL_OES_EGL_image_external") ||
        extensionEnabled("GL_NV_EGL_stream_consumer_external"))
    {
        EXPECT_GL_NO_ERROR();
        EXPECT_EQ(0, textureBinding);
    }
    else
    {
        EXPECT_GL_ERROR(GL_INVALID_ENUM);
    }
}

TEST_P(Texture2DTest, ZeroSizedUploads)
{
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    EXPECT_GL_ERROR(GL_NO_ERROR);

    setUpProgram();

    // Use the texture first to make sure it's in video memory
    glUseProgram(mProgram);
    glUniform1i(mTexture2DUniformLocation, 0);
    drawQuad(mProgram, "position", 0.5f);

    const GLubyte *pixel[4] = { 0 };

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
    EXPECT_GL_NO_ERROR();

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
    EXPECT_GL_NO_ERROR();

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
    EXPECT_GL_NO_ERROR();
}

// Test drawing with two texture types, to trigger an ANGLE bug in validation
TEST_P(TextureCubeTest, CubeMapBug)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_CUBE_MAP, mTextureCube);
    EXPECT_GL_ERROR(GL_NO_ERROR);

    glUseProgram(mProgram);
    glUniform1i(mTexture2DUniformLocation, 0);
    glUniform1i(mTextureCubeUniformLocation, 1);
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();
}

// Test drawing with two texture types accessed from the same shader and check that the result of
// drawing is correct.
TEST_P(TextureCubeTest, CubeMapDraw)
{
    GLubyte texData[4];
    texData[0] = 0;
    texData[1] = 60;
    texData[2] = 0;
    texData[3] = 255;

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, texData);

    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_CUBE_MAP, mTextureCube);
    texData[1] = 120;
    glTexSubImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE,
                    texData);
    EXPECT_GL_ERROR(GL_NO_ERROR);

    glUseProgram(mProgram);
    glUniform1i(mTexture2DUniformLocation, 0);
    glUniform1i(mTextureCubeUniformLocation, 1);
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();

    int px = getWindowWidth() - 1;
    int py = 0;
    EXPECT_PIXEL_NEAR(px, py, 0, 180, 0, 255, 2);
}

TEST_P(Sampler2DAsFunctionParameterTest, Sampler2DAsFunctionParameter)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    GLubyte texData[4];
    texData[0] = 0;
    texData[1] = 128;
    texData[2] = 0;
    texData[3] = 255;
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, texData);
    glUseProgram(mProgram);
    glUniform1i(mTexture2DUniformLocation, 0);
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();

    EXPECT_PIXEL_NEAR(0, 0, 0, 128, 0, 255, 2);
}

// Test drawing with two textures passed to the shader in a sampler array.
TEST_P(SamplerArrayTest, SamplerArrayDraw)
{
    testSamplerArrayDraw();
}

// Test drawing with two textures passed to the shader in a sampler array which is passed to a
// user-defined function in the shader.
TEST_P(SamplerArrayAsFunctionParameterTest, SamplerArrayAsFunctionParameter)
{
    testSamplerArrayDraw();
}

// Copy of a test in conformance/textures/texture-mips, to test generate mipmaps
TEST_P(Texture2DTestWithDrawScale, MipmapsTwice)
{
    int px = getWindowWidth() / 2;
    int py = getWindowHeight() / 2;

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);

    std::vector<GLColor> pixelsRed(16u * 16u, GLColor::red);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixelsRed.data());
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glGenerateMipmap(GL_TEXTURE_2D);

    glUseProgram(mProgram);
    glUniform1i(mTexture2DUniformLocation, 0);
    glUniform2f(mDrawScaleUniformLocation, 0.0625f, 0.0625f);
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(px, py, GLColor::red);

    std::vector<GLColor> pixelsBlue(16u * 16u, GLColor::blue);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 pixelsBlue.data());
    glGenerateMipmap(GL_TEXTURE_2D);

    std::vector<GLColor> pixelsGreen(16u * 16u, GLColor::green);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 pixelsGreen.data());
    glGenerateMipmap(GL_TEXTURE_2D);

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(px, py, GLColor::green);
}

// Test creating a FBO with a cube map render target, to test an ANGLE bug
// https://code.google.com/p/angleproject/issues/detail?id=849
TEST_P(TextureCubeTest, CubeMapFBO)
{
    GLuint fbo;
    glGenFramebuffers(1, &fbo);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    glBindTexture(GL_TEXTURE_CUBE_MAP, mTextureCube);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, mTextureCube, 0);

    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    glDeleteFramebuffers(1, &fbo);

    EXPECT_GL_NO_ERROR();
}

// Test that glTexSubImage2D works properly when glTexStorage2DEXT has initialized the image with a default color.
TEST_P(Texture2DTest, TexStorage)
{
    int width = getWindowWidth();
    int height = getWindowHeight();

    GLuint tex2D;
    glGenTextures(1, &tex2D);
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, tex2D);

    // Fill with red
    std::vector<GLubyte> pixels(3 * 16 * 16);
    for (size_t pixelId = 0; pixelId < 16 * 16; ++pixelId)
    {
        pixels[pixelId * 3 + 0] = 255;
        pixels[pixelId * 3 + 1] = 0;
        pixels[pixelId * 3 + 2] = 0;
    }

    // ANGLE internally uses RGBA as the DirectX format for RGB images
    // therefore glTexStorage2DEXT initializes the image to a default color to get a consistent alpha color.
    // The data is kept in a CPU-side image and the image is marked as dirty.
    glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGB8, 16, 16);

    // Initializes the color of the upper-left 8x8 pixels, leaves the other pixels untouched.
    // glTexSubImage2D should take into account that the image is dirty.
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 8, 8, GL_RGB, GL_UNSIGNED_BYTE, pixels.data());
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    setUpProgram();

    glUseProgram(mProgram);
    glUniform1i(mTexture2DUniformLocation, 0);
    drawQuad(mProgram, "position", 0.5f);
    glDeleteTextures(1, &tex2D);
    EXPECT_GL_NO_ERROR();
    EXPECT_PIXEL_EQ(width / 4, height / 4, 255, 0, 0, 255);

    // Validate that the region of the texture without data has an alpha of 1.0
    GLubyte pixel[4];
    glReadPixels(3 * width / 4, 3 * height / 4, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
    EXPECT_EQ(pixel[3], 255);
}

// Test that glTexSubImage2D combined with a PBO works properly when glTexStorage2DEXT has initialized the image with a default color.
TEST_P(Texture2DTest, TexStorageWithPBO)
{
    if (extensionEnabled("NV_pixel_buffer_object"))
    {
        int width = getWindowWidth();
        int height = getWindowHeight();

        GLuint tex2D;
        glGenTextures(1, &tex2D);
        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, tex2D);

        // Fill with red
        std::vector<GLubyte> pixels(3 * 16 * 16);
        for (size_t pixelId = 0; pixelId < 16 * 16; ++pixelId)
        {
            pixels[pixelId * 3 + 0] = 255;
            pixels[pixelId * 3 + 1] = 0;
            pixels[pixelId * 3 + 2] = 0;
        }

        // Read 16x16 region from red backbuffer to PBO
        GLuint pbo;
        glGenBuffers(1, &pbo);
        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
        glBufferData(GL_PIXEL_UNPACK_BUFFER, 3 * 16 * 16, pixels.data(), GL_STATIC_DRAW);

        // ANGLE internally uses RGBA as the DirectX format for RGB images
        // therefore glTexStorage2DEXT initializes the image to a default color to get a consistent alpha color.
        // The data is kept in a CPU-side image and the image is marked as dirty.
        glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGB8, 16, 16);

        // Initializes the color of the upper-left 8x8 pixels, leaves the other pixels untouched.
        // glTexSubImage2D should take into account that the image is dirty.
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 8, 8, GL_RGB, GL_UNSIGNED_BYTE, NULL);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

        setUpProgram();

        glUseProgram(mProgram);
        glUniform1i(mTexture2DUniformLocation, 0);
        drawQuad(mProgram, "position", 0.5f);
        glDeleteTextures(1, &tex2D);
        glDeleteBuffers(1, &pbo);
        EXPECT_GL_NO_ERROR();
        EXPECT_PIXEL_EQ(3 * width / 4, 3 * height / 4, 0, 0, 0, 255);
        EXPECT_PIXEL_EQ(width / 4, height / 4, 255, 0, 0, 255);
    }
}

// See description on testFloatCopySubImage
TEST_P(Texture2DTest, CopySubImageFloat_R_R)
{
    testFloatCopySubImage(1, 1);
}

TEST_P(Texture2DTest, CopySubImageFloat_RG_R)
{
    testFloatCopySubImage(2, 1);
}

TEST_P(Texture2DTest, CopySubImageFloat_RG_RG)
{
    testFloatCopySubImage(2, 2);
}

TEST_P(Texture2DTest, CopySubImageFloat_RGB_R)
{
    if (IsIntel() && IsLinux())
    {
        // TODO(cwallez): Fix on Linux Intel drivers (http://anglebug.com/1346)
        std::cout << "Test disabled on Linux Intel OpenGL." << std::endl;
        return;
    }

    testFloatCopySubImage(3, 1);
}

TEST_P(Texture2DTest, CopySubImageFloat_RGB_RG)
{
    if (IsIntel() && IsLinux())
    {
        // TODO(cwallez): Fix on Linux Intel drivers (http://anglebug.com/1346)
        std::cout << "Test disabled on Linux Intel OpenGL." << std::endl;
        return;
    }

    testFloatCopySubImage(3, 2);
}

TEST_P(Texture2DTest, CopySubImageFloat_RGB_RGB)
{
    if (IsIntel() && IsLinux())
    {
        // TODO(cwallez): Fix on Linux Intel drivers (http://anglebug.com/1346)
        std::cout << "Test disabled on Linux Intel OpenGL." << std::endl;
        return;
    }

    // TODO (bug 1284): Investigate RGBA32f D3D SDK Layers messages on D3D11_FL9_3
    if (IsD3D11_FL93())
    {
        std::cout << "Test skipped on Feature Level 9_3." << std::endl;
        return;
    }

    testFloatCopySubImage(3, 3);
}

TEST_P(Texture2DTest, CopySubImageFloat_RGBA_R)
{
    testFloatCopySubImage(4, 1);
}

TEST_P(Texture2DTest, CopySubImageFloat_RGBA_RG)
{
    testFloatCopySubImage(4, 2);
}

TEST_P(Texture2DTest, CopySubImageFloat_RGBA_RGB)
{
    // TODO (bug 1284): Investigate RGBA32f D3D SDK Layers messages on D3D11_FL9_3
    if (IsD3D11_FL93())
    {
        std::cout << "Test skipped on Feature Level 9_3." << std::endl;
        return;
    }

    testFloatCopySubImage(4, 3);
}

TEST_P(Texture2DTest, CopySubImageFloat_RGBA_RGBA)
{
    // TODO (bug 1284): Investigate RGBA32f D3D SDK Layers messages on D3D11_FL9_3
    if (IsD3D11_FL93())
    {
        std::cout << "Test skipped on Feature Level 9_3." << std::endl;
        return;
    }

    testFloatCopySubImage(4, 4);
}

// Port of https://www.khronos.org/registry/webgl/conformance-suites/1.0.3/conformance/textures/texture-npot.html
// Run against GL_ALPHA/UNSIGNED_BYTE format, to ensure that D3D11 Feature Level 9_3 correctly handles GL_ALPHA
TEST_P(Texture2DTest, TextureNPOT_GL_ALPHA_UBYTE)
{
    const int npotTexSize = 5;
    const int potTexSize = 4; // Should be less than npotTexSize
    GLuint tex2D;

    if (extensionEnabled("GL_OES_texture_npot"))
    {
        // This test isn't applicable if texture_npot is enabled
        return;
    }

    setUpProgram();

    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

    // Default unpack alignment is 4. The values of 'pixels' below needs it to be 1.
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    glActiveTexture(GL_TEXTURE0);
    glGenTextures(1, &tex2D);
    glBindTexture(GL_TEXTURE_2D, tex2D);

    std::vector<GLubyte> pixels(1 * npotTexSize * npotTexSize);
    for (size_t pixelId = 0; pixelId < npotTexSize * npotTexSize; ++pixelId)
    {
        pixels[pixelId] = 64;
    }

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    // Check that an NPOT texture not on level 0 generates INVALID_VALUE
    glTexImage2D(GL_TEXTURE_2D, 1, GL_ALPHA, npotTexSize, npotTexSize, 0, GL_ALPHA, GL_UNSIGNED_BYTE, pixels.data());
    EXPECT_GL_ERROR(GL_INVALID_VALUE);

    // Check that an NPOT texture on level 0 succeeds
    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, npotTexSize, npotTexSize, 0, GL_ALPHA, GL_UNSIGNED_BYTE, pixels.data());
    EXPECT_GL_NO_ERROR();

    // Check that generateMipmap fails on NPOT
    glGenerateMipmap(GL_TEXTURE_2D);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);

    // Check that nothing is drawn if filtering is not correct for NPOT
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glClear(GL_COLOR_BUFFER_BIT);
    drawQuad(mProgram, "position", 1.0f);
    EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 0, 0, 0, 255);

    // NPOT texture with TEXTURE_MIN_FILTER not NEAREST or LINEAR should draw with 0,0,0,255
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
    glClear(GL_COLOR_BUFFER_BIT);
    drawQuad(mProgram, "position", 1.0f);
    EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 0, 0, 0, 255);

    // NPOT texture with TEXTURE_MIN_FILTER set to LINEAR should draw
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glClear(GL_COLOR_BUFFER_BIT);
    drawQuad(mProgram, "position", 1.0f);
    EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 0, 0, 0, 64);

    // Check that glTexImage2D for POT texture succeeds
    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, potTexSize, potTexSize, 0, GL_ALPHA, GL_UNSIGNED_BYTE, pixels.data());
    EXPECT_GL_NO_ERROR();

    // Check that generateMipmap for an POT texture succeeds
    glGenerateMipmap(GL_TEXTURE_2D);
    EXPECT_GL_NO_ERROR();

    // POT texture with TEXTURE_MIN_FILTER set to LINEAR_MIPMAP_LINEAR should draw
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glClear(GL_COLOR_BUFFER_BIT);
    drawQuad(mProgram, "position", 1.0f);
    EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 0, 0, 0, 64);
    EXPECT_GL_NO_ERROR();
}

// Test to ensure that glTexSubImage2D always accepts data for non-power-of-two subregions.
// ANGLE previously rejected this if GL_OES_texture_npot wasn't active, which is incorrect.
TEST_P(Texture2DTest, NPOTSubImageParameters)
{
    // TODO(geofflang): Allow the GL backend to accept SubImage calls with a null data ptr. (bug
    // 1278)
    if (getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE ||
        getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE)
    {
        std::cout << "Test disabled on OpenGL." << std::endl;
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);

    // Create an 8x8 (i.e. power-of-two) texture.
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glGenerateMipmap(GL_TEXTURE_2D);

    // Supply a 3x3 (i.e. non-power-of-two) subimage to the texture.
    // This should always work, even if GL_OES_texture_npot isn't active.
    glTexSubImage2D(GL_TEXTURE_2D, 1, 0, 0, 3, 3, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    EXPECT_GL_NO_ERROR();
}

// Test to check that texture completeness is determined correctly when the texture base level is
// greater than 0, and also that level 0 is not sampled when base level is greater than 0.
TEST_P(Texture2DTestES3, DrawWithBaseLevel1)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);

    std::vector<GLColor> texDataRed(4u * 4u, GLColor::red);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE, texDataRed.data());
    std::vector<GLColor> texDataGreen(2u * 2u, GLColor::green);
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());
    glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that drawing works correctly when levels outside the BASE_LEVEL/MAX_LEVEL range do not
// have images defined.
TEST_P(Texture2DTestES3, DrawWithLevelsOutsideRangeUndefined)
{
    if (IsAMD() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Observed crashing on AMD. Oddly the crash only happens with 2D textures, not 3D or array.
        std::cout << "Test skipped on AMD OpenGL." << std::endl;
        return;
    }
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    std::vector<GLColor> texDataGreen(2u * 2u, GLColor::green);
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that drawing works correctly when level 0 is undefined and base level is 1.
TEST_P(Texture2DTestES3, DrawWithLevelZeroUndefined)
{
    if (IsAMD() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Observed crashing on AMD. Oddly the crash only happens with 2D textures, not 3D or array.
        std::cout << "Test skipped on AMD OpenGL." << std::endl;
        return;
    }
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    std::vector<GLColor> texDataGreen(2u * 2u, GLColor::green);
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 2);

    EXPECT_GL_NO_ERROR();

    // Texture is incomplete.
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::black);

    glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    // Texture is now complete.
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that drawing works correctly when levels outside the BASE_LEVEL/MAX_LEVEL range have
// dimensions that don't fit the images inside the range.
// GLES 3.0.4 section 3.8.13 Texture completeness
TEST_P(Texture2DTestES3, DrawWithLevelsOutsideRangeWithInconsistentDimensions)
{
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    std::vector<GLColor> texDataRed(8u * 8u, GLColor::red);
    std::vector<GLColor> texDataGreen(2u * 2u, GLColor::green);
    std::vector<GLColor> texDataCyan(2u * 2u, GLColor::cyan);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    // Two levels that are initially unused.
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, texDataRed.data());
    glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataCyan.data());

    // One level that is used - only this level should affect completeness.
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Intel was observed drawing color 0,0,0,0 instead of the texture color after the base
        // level was changed.
        std::cout << "Test partially skipped on Intel OpenGL." << std::endl;
        return;
    }

    // Switch the level that is being used to the cyan level 2.
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 2);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 2);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::cyan);
}

// Test that drawing works correctly when levels outside the BASE_LEVEL/MAX_LEVEL range do not
// have images defined.
TEST_P(Texture3DTestES3, DrawWithLevelsOutsideRangeUndefined)
{
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_3D, mTexture3D);
    std::vector<GLColor> texDataGreen(2u * 2u * 2u, GLColor::green);
    glTexImage3D(GL_TEXTURE_3D, 1, GL_RGBA8, 2, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that drawing works correctly when levels outside the BASE_LEVEL/MAX_LEVEL range have
// dimensions that don't fit the images inside the range.
// GLES 3.0.4 section 3.8.13 Texture completeness
TEST_P(Texture3DTestES3, DrawWithLevelsOutsideRangeWithInconsistentDimensions)
{
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_3D, mTexture3D);
    std::vector<GLColor> texDataRed(8u * 8u * 8u, GLColor::red);
    std::vector<GLColor> texDataGreen(2u * 2u * 2u, GLColor::green);
    std::vector<GLColor> texDataCyan(2u * 2u * 2u, GLColor::cyan);

    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    // Two levels that are initially unused.
    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA8, 8, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataRed.data());
    glTexImage3D(GL_TEXTURE_3D, 2, GL_RGBA8, 2, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataCyan.data());

    // One level that is used - only this level should affect completeness.
    glTexImage3D(GL_TEXTURE_3D, 1, GL_RGBA8, 2, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Intel was observed drawing color 0,0,0,0 instead of the texture color after the base
        // level was changed.
        std::cout << "Test partially skipped on Intel OpenGL." << std::endl;
        return;
    }

    // Switch the level that is being used to the cyan level 2.
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_BASE_LEVEL, 2);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAX_LEVEL, 2);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::cyan);
}

// Test that drawing works correctly when levels outside the BASE_LEVEL/MAX_LEVEL range do not
// have images defined.
TEST_P(Texture2DArrayTestES3, DrawWithLevelsOutsideRangeUndefined)
{
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D_ARRAY, m2DArrayTexture);
    std::vector<GLColor> texDataGreen(2u * 2u * 2u, GLColor::green);
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 1, GL_RGBA8, 2, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that drawing works correctly when levels outside the BASE_LEVEL/MAX_LEVEL range have
// dimensions that don't fit the images inside the range.
// GLES 3.0.4 section 3.8.13 Texture completeness
TEST_P(Texture2DArrayTestES3, DrawWithLevelsOutsideRangeWithInconsistentDimensions)
{
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_3D, m2DArrayTexture);
    std::vector<GLColor> texDataRed(8u * 8u * 8u, GLColor::red);
    std::vector<GLColor> texDataGreen(2u * 2u * 2u, GLColor::green);
    std::vector<GLColor> texDataCyan(2u * 2u * 2u, GLColor::cyan);

    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    // Two levels that are initially unused.
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA8, 8, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataRed.data());
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 2, GL_RGBA8, 2, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataCyan.data());

    // One level that is used - only this level should affect completeness.
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 1, GL_RGBA8, 2, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Intel was observed drawing color 0,0,0,0 instead of the texture color after the base
        // level was changed.
        std::cout << "Test partially skipped on Intel OpenGL." << std::endl;
        return;
    }
    if (IsNVIDIA() && (getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE ||
                       getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE))
    {
        // NVIDIA was observed drawing color 0,0,0,0 instead of the texture color after the base
        // level was changed.
        std::cout << "Test partially skipped on NVIDIA OpenGL." << std::endl;
        return;
    }

    // Switch the level that is being used to the cyan level 2.
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_BASE_LEVEL, 2);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 2);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::cyan);
}

// Test that texture completeness is updated if texture max level changes.
// GLES 3.0.4 section 3.8.13 Texture completeness
TEST_P(Texture2DTestES3, TextureCompletenessChangesWithMaxLevel)
{
    if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Intel was observed having wrong behavior after the texture is made incomplete by changing
        // the base level.
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    std::vector<GLColor> texDataGreen(8u * 8u, GLColor::green);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    // A level that is initially unused.
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    // One level that is initially used - only this level should affect completeness.
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // Switch the max level to level 1. The levels within the used range now have inconsistent
    // dimensions and the texture should be incomplete.
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::black);
}

// Test that 3D texture completeness is updated if texture max level changes.
// GLES 3.0.4 section 3.8.13 Texture completeness
TEST_P(Texture3DTestES3, Texture3DCompletenessChangesWithMaxLevel)
{
    if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Intel was observed having wrong behavior after the texture is made incomplete by changing
        // the base level.
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }
    if (IsOSX())
    {
        // Observed incorrect rendering on OSX.
        std::cout << "Test skipped on OSX." << std::endl;
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_3D, mTexture3D);
    std::vector<GLColor> texDataGreen(2u * 2u * 2u, GLColor::green);

    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    // A level that is initially unused.
    glTexImage3D(GL_TEXTURE_3D, 1, GL_RGBA8, 1, 1, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    // One level that is initially used - only this level should affect completeness.
    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA8, 2, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_BASE_LEVEL, 0);
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAX_LEVEL, 0);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // Switch the max level to level 1. The levels within the used range now have inconsistent
    // dimensions and the texture should be incomplete.
    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAX_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::black);
}

// Test that texture completeness is updated if texture base level changes.
// GLES 3.0.4 section 3.8.13 Texture completeness
TEST_P(Texture2DTestES3, TextureCompletenessChangesWithBaseLevel)
{
    if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Intel was observed having wrong behavior after the texture is made incomplete by changing
        // the base level.
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    std::vector<GLColor> texDataGreen(8u * 8u, GLColor::green);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    // Two levels that are initially unused.
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    // One level that is initially used - only this level should affect completeness.
    glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataGreen.data());

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 2);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 2);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // Switch the base level to level 1. The levels within the used range now have inconsistent
    // dimensions and the texture should be incomplete.
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::black);
}

// Test that texture is not complete if base level is greater than max level.
// GLES 3.0.4 section 3.8.13 Texture completeness
TEST_P(Texture2DTestES3, TextureBaseLevelGreaterThanMaxLevel)
{
    if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        // Intel Windows OpenGL driver crashes if the base level of a non-immutable texture is out
        // of range.
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &GLColor::green);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 10000);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    // Texture should be incomplete.
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::black);
}

// Test that immutable texture base level and max level are clamped.
// GLES 3.0.4 section 3.8.10 subsection Mipmapping
TEST_P(Texture2DTestES3, ImmutableTextureBaseLevelOutOfRange)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 1, 1);

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &GLColor::green);

    // For immutable-format textures, base level should be clamped to [0, levels - 1], and max level
    // should be clamped to [base_level, levels - 1].
    // GLES 3.0.4 section 3.8.10 subsection Mipmapping
    // In the case of this test, those rules make the effective base level and max level 0.
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 10000);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 10000);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    // Texture should be complete.
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that changing base level works when it affects the format of the texture.
TEST_P(Texture2DTestES3, TextureFormatChangesWithBaseLevel)
{
    if (IsNVIDIA() && IsOpenGL())
    {
        // Observed rendering corruption on NVIDIA OpenGL.
        std::cout << "Test skipped on NVIDIA OpenGL." << std::endl;
        return;
    }
    if (IsIntel() && IsDesktopOpenGL())
    {
        // Observed incorrect rendering on Intel OpenGL.
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }
    if (IsAMD() && IsDesktopOpenGL())
    {
        // Observed incorrect rendering on AMD OpenGL.
        std::cout << "Test skipped on AMD OpenGL." << std::endl;
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    std::vector<GLColor> texDataCyan(4u * 4u, GLColor::cyan);
    std::vector<GLColor> texDataGreen(4u * 4u, GLColor::green);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    // RGBA8 level that's initially unused.
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 texDataCyan.data());

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);

    // RG8 level that's initially used, with consistent dimensions with level 0 but a different
    // format. It reads green channel data from the green and alpha channels of texDataGreen
    // (this is a bit hacky but works).
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RG8, 2, 2, 0, GL_RG, GL_UNSIGNED_BYTE, texDataGreen.data());

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // Switch the texture to use the cyan level 0 with the RGBA format.
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);

    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::cyan);
}

// Test that setting a texture image works when base level is out of range.
TEST_P(Texture2DTestES3, SetImageWhenBaseLevelOutOfRange)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 10000);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 10000);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &GLColor::green);

    EXPECT_GL_NO_ERROR();

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);

    drawQuad(mProgram, "position", 0.5f);

    // Texture should be complete.
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// In the D3D11 renderer, we need to initialize some texture formats, to fill empty channels. EG RBA->RGBA8, with 1.0
// in the alpha channel. This test covers a bug where redefining array textures with these formats does not work as
// expected.
TEST_P(Texture2DArrayTestES3, RedefineInittableArray)
{
    std::vector<GLubyte> pixelData;
    for (size_t count = 0; count < 5000; count++)
    {
        pixelData.push_back(0u);
        pixelData.push_back(255u);
        pixelData.push_back(0u);
    }

    glBindTexture(GL_TEXTURE_2D_ARRAY, m2DArrayTexture);
    glUseProgram(mProgram);
    glUniform1i(mTextureArrayLocation, 0);

    // The first draw worked correctly.
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGB, 4, 4, 2, 0, GL_RGB, GL_UNSIGNED_BYTE, &pixelData[0]);

    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_REPEAT);
    drawQuad(mProgram, "position", 1.0f);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // The dimension of the respecification must match the original exactly to trigger the bug.
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGB, 4, 4, 2, 0, GL_RGB, GL_UNSIGNED_BYTE, &pixelData[0]);
    drawQuad(mProgram, "position", 1.0f);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    ASSERT_GL_NO_ERROR();
}

// Test shadow sampler and regular non-shadow sampler coexisting in the same shader.
// This test is needed especially to confirm that sampler registers get assigned correctly on
// the HLSL backend even when there's a mix of different HLSL sampler and texture types.
TEST_P(ShadowSamplerPlusSampler3DTestES3, ShadowSamplerPlusSampler3DDraw)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_3D, mTexture3D);
    GLubyte texData[4];
    texData[0] = 0;
    texData[1] = 60;
    texData[2] = 0;
    texData[3] = 255;
    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA, 1, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, texData);

    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, mTextureShadow);
    GLfloat depthTexData[1];
    depthTexData[0] = 0.5f;
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, 1, 1, 0, GL_DEPTH_COMPONENT, GL_FLOAT,
                 depthTexData);

    glUseProgram(mProgram);
    glUniform1f(mDepthRefUniformLocation, 0.3f);
    glUniform1i(mTexture3DUniformLocation, 0);
    glUniform1i(mTextureShadowUniformLocation, 1);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();
    // The shader writes 0.5 * <comparison result (1.0)> + <texture color>
    EXPECT_PIXEL_NEAR(0, 0, 128, 188, 128, 255, 2);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_GREATER);
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();
    // The shader writes 0.5 * <comparison result (0.0)> + <texture color>
    EXPECT_PIXEL_NEAR(0, 0, 0, 60, 0, 255, 2);
}

// Test multiple different sampler types in the same shader.
// This test makes sure that even if sampler / texture registers get grouped together based on type
// or otherwise get shuffled around in the HLSL backend of the shader translator, the D3D renderer
// still has the right register index information for each ESSL sampler.
// The tested ESSL samplers have the following types in D3D11 HLSL:
// sampler2D:         Texture2D   + SamplerState
// samplerCube:       TextureCube + SamplerState
// sampler2DShadow:   Texture2D   + SamplerComparisonState
// samplerCubeShadow: TextureCube + SamplerComparisonState
TEST_P(SamplerTypeMixTestES3, SamplerTypeMixDraw)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    GLubyte texData[4];
    texData[0] = 0;
    texData[1] = 0;
    texData[2] = 120;
    texData[3] = 255;
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, texData);

    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_CUBE_MAP, mTextureCube);
    texData[0] = 0;
    texData[1] = 90;
    texData[2] = 0;
    texData[3] = 255;
    glTexStorage2D(GL_TEXTURE_CUBE_MAP, 1, GL_RGBA8, 1, 1);
    glTexSubImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE,
                    texData);

    glActiveTexture(GL_TEXTURE2);
    glBindTexture(GL_TEXTURE_2D, mTexture2DShadow);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
    GLfloat depthTexData[1];
    depthTexData[0] = 0.5f;
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, 1, 1, 0, GL_DEPTH_COMPONENT, GL_FLOAT,
                 depthTexData);

    glActiveTexture(GL_TEXTURE3);
    glBindTexture(GL_TEXTURE_CUBE_MAP, mTextureCubeShadow);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
    depthTexData[0] = 0.2f;
    glTexStorage2D(GL_TEXTURE_CUBE_MAP, 1, GL_DEPTH_COMPONENT32F, 1, 1);
    glTexSubImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, 0, 0, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT,
                    depthTexData);

    EXPECT_GL_NO_ERROR();

    glUseProgram(mProgram);
    glUniform1f(mDepthRefUniformLocation, 0.3f);
    glUniform1i(mTexture2DUniformLocation, 0);
    glUniform1i(mTextureCubeUniformLocation, 1);
    glUniform1i(mTexture2DShadowUniformLocation, 2);
    glUniform1i(mTextureCubeShadowUniformLocation, 3);

    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();
    // The shader writes:
    // <texture 2d color> +
    // <cube map color> +
    // 0.25 * <comparison result (1.0)> +
    // 0.125 * <comparison result (0.0)>
    EXPECT_PIXEL_NEAR(0, 0, 64, 154, 184, 255, 2);
}

// Test different base levels on textures accessed through the same sampler array.
// Calling textureSize() on the samplers hits the D3D sampler metadata workaround.
TEST_P(TextureSizeTextureArrayTest, BaseLevelVariesInTextureArray)
{
    if ((IsAMD() || IsIntel()) && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE)
    {
        std::cout << "Test skipped on Intel and AMD D3D." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2DA);
    GLsizei size = 64;
    for (GLint level = 0; level < 7; ++level)
    {
        ASSERT_LT(0, size);
        glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, size, size, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                     nullptr);
        size = size / 2;
    }
    ASSERT_EQ(0, size);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);

    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, mTexture2DB);
    size = 128;
    for (GLint level = 0; level < 8; ++level)
    {
        ASSERT_LT(0, size);
        glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, size, size, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                     nullptr);
        size = size / 2;
    }
    ASSERT_EQ(0, size);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 3);
    EXPECT_GL_NO_ERROR();

    glUseProgram(mProgram);
    glUniform1i(mTexture0Location, 0);
    glUniform1i(mTexture1Location, 1);

    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_NO_ERROR();
    // Red channel: width of level 1 of texture A: 32.
    // Green channel: width of level 3 of texture B: 16.
    EXPECT_PIXEL_NEAR(0, 0, 32, 16, 0, 255, 2);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureRGBImplicitAlpha1)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, 1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureLuminanceImplicitAlpha1)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 1, 1, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, nullptr);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureLuminance32ImplicitAlpha1)
{
    if (extensionEnabled("GL_OES_texture_float"))
    {
        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, mTexture2D);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 1, 1, 0, GL_LUMINANCE, GL_FLOAT, nullptr);
        EXPECT_GL_NO_ERROR();

        drawQuad(mProgram, "position", 0.5f);

        EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
    }
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureLuminance16ImplicitAlpha1)
{
    if (extensionEnabled("GL_OES_texture_half_float"))
    {
        if (IsNVIDIA() && IsOpenGLES())
        {
            std::cout << "Test skipped on NVIDIA" << std::endl;
            return;
        }
        // TODO(ynovikov): re-enable once root cause of http://anglebug.com/1420 is fixed
        if (IsAndroid() && IsAdreno() && IsOpenGLES())
        {
            std::cout << "Test skipped on Adreno OpenGLES on Android." << std::endl;
            return;
        }

        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, mTexture2D);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 1, 1, 0, GL_LUMINANCE, GL_HALF_FLOAT_OES,
                     nullptr);
        EXPECT_GL_NO_ERROR();

        drawQuad(mProgram, "position", 0.5f);

        EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
    }
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DUnsignedIntegerAlpha1TestES3, TextureRGB8UIImplicitAlpha1)
{
    if (IsIntel())
    {
        std::cout << "Test disabled on Intel." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8UI, 1, 1, 0, GL_RGB_INTEGER, GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DIntegerAlpha1TestES3, TextureRGB8IImplicitAlpha1)
{
    if (IsIntel())
    {
        std::cout << "Test disabled on Intel." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8I, 1, 1, 0, GL_RGB_INTEGER, GL_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DUnsignedIntegerAlpha1TestES3, TextureRGB16UIImplicitAlpha1)
{
    if (IsIntel())
    {
        std::cout << "Test disabled on Intel." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16UI, 1, 1, 0, GL_RGB_INTEGER, GL_UNSIGNED_SHORT, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DIntegerAlpha1TestES3, TextureRGB16IImplicitAlpha1)
{
    if (IsIntel())
    {
        std::cout << "Test disabled on Intel." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16I, 1, 1, 0, GL_RGB_INTEGER, GL_SHORT, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DUnsignedIntegerAlpha1TestES3, TextureRGB32UIImplicitAlpha1)
{
    if (IsIntel())
    {
        std::cout << "Test disabled on Intel." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32UI, 1, 1, 0, GL_RGB_INTEGER, GL_UNSIGNED_INT, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DIntegerAlpha1TestES3, TextureRGB32IImplicitAlpha1)
{
    if (IsIntel())
    {
        std::cout << "Test disabled on Intel." << std::endl;
        return;
    }
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32I, 1, 1, 0, GL_RGB_INTEGER, GL_INT, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureRGBSNORMImplicitAlpha1)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8_SNORM, 1, 1, 0, GL_RGB, GL_BYTE, nullptr);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureRGB9E5ImplicitAlpha1)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB9_E5, 1, 1, 0, GL_RGB, GL_UNSIGNED_INT_5_9_9_9_REV,
                 nullptr);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureCOMPRESSEDRGB8ETC2ImplicitAlpha1)
{
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGB8_ETC2, 1, 1, 0, 8, nullptr);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// When sampling a texture without an alpha channel, "1" is returned as the alpha value.
// ES 3.0.4 table 3.24
TEST_P(Texture2DTestES3, TextureCOMPRESSEDSRGB8ETC2ImplicitAlpha1)
{
    if (IsIntel() && IsLinux())
    {
        // TODO(cwallez): Fix on Linux Intel drivers (http://anglebug.com/1346)
        std::cout << "Test disabled on Linux Intel OpenGL." << std::endl;
        return;
    }

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_SRGB8_ETC2, 1, 1, 0, 8, nullptr);
    EXPECT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);

    EXPECT_PIXEL_ALPHA_EQ(0, 0, 255);
}

// Use a sampler in a uniform struct.
TEST_P(SamplerInStructTest, SamplerInStruct)
{
    runSamplerInStructTest();
}

// Use a sampler in a uniform struct that's passed as a function parameter.
TEST_P(SamplerInStructAsFunctionParameterTest, SamplerInStructAsFunctionParameter)
{
    // TODO(ynovikov): re-enable once root cause of http://anglebug.com/1427 is fixed
    if (IsAndroid() && IsAdreno() && IsOpenGLES())
    {
        std::cout << "Test skipped on Adreno OpenGLES on Android." << std::endl;
        return;
    }

    if (IsWindows() && IsIntel() && IsOpenGL())
    {
        std::cout << "Test skipped on Windows OpenGL on Intel." << std::endl;
        return;
    }

    runSamplerInStructTest();
}

// Use a sampler in a uniform struct array with a struct from the array passed as a function
// parameter.
TEST_P(SamplerInStructArrayAsFunctionParameterTest, SamplerInStructArrayAsFunctionParameter)
{
    if (IsIntel() && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }
    // TODO(ynovikov): re-enable once root cause of http://anglebug.com/1427 is fixed
    if (IsAndroid() && IsAdreno() && IsOpenGLES())
    {
        std::cout << "Test skipped on Adreno OpenGLES on Android." << std::endl;
        return;
    }
    runSamplerInStructTest();
}

// Use a sampler in a struct inside a uniform struct with the nested struct passed as a function
// parameter.
TEST_P(SamplerInNestedStructAsFunctionParameterTest, SamplerInNestedStructAsFunctionParameter)
{
    if (IsIntel() && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }
    // TODO(ynovikov): re-enable once root cause of http://anglebug.com/1427 is fixed
    if (IsAndroid() && IsAdreno() && IsOpenGLES())
    {
        std::cout << "Test skipped on Adreno OpenGLES on Android." << std::endl;
        return;
    }
    runSamplerInStructTest();
}

// Make sure that there isn't a name conflict between sampler extracted from a struct and a
// similarly named uniform.
TEST_P(SamplerInStructAndOtherVariableTest, SamplerInStructAndOtherVariable)
{
    runSamplerInStructTest();
}

class TextureLimitsTest : public ANGLETest
{
  protected:
    struct RGBA8
    {
        uint8_t R, G, B, A;
    };

    TextureLimitsTest()
        : mProgram(0), mMaxVertexTextures(0), mMaxFragmentTextures(0), mMaxCombinedTextures(0)
    {
        setWindowWidth(128);
        setWindowHeight(128);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
    }

    ~TextureLimitsTest()
    {
        if (mProgram != 0)
        {
            glDeleteProgram(mProgram);
            mProgram = 0;

            if (!mTextures.empty())
            {
                glDeleteTextures(static_cast<GLsizei>(mTextures.size()), &mTextures[0]);
            }
        }
    }

    void SetUp() override
    {
        ANGLETest::SetUp();

        glGetIntegerv(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &mMaxVertexTextures);
        glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &mMaxFragmentTextures);
        glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &mMaxCombinedTextures);

        ASSERT_GL_NO_ERROR();
    }

    void compileProgramWithTextureCounts(const std::string &vertexPrefix,
                                         GLint vertexTextureCount,
                                         GLint vertexActiveTextureCount,
                                         const std::string &fragPrefix,
                                         GLint fragmentTextureCount,
                                         GLint fragmentActiveTextureCount)
    {
        std::stringstream vertexShaderStr;
        vertexShaderStr << "attribute vec2 position;\n"
                        << "varying vec4 color;\n"
                        << "varying vec2 texCoord;\n";

        for (GLint textureIndex = 0; textureIndex < vertexTextureCount; ++textureIndex)
        {
            vertexShaderStr << "uniform sampler2D " << vertexPrefix << textureIndex << ";\n";
        }

        vertexShaderStr << "void main() {\n"
                        << "  gl_Position = vec4(position, 0, 1);\n"
                        << "  texCoord = (position * 0.5) + 0.5;\n"
                        << "  color = vec4(0);\n";

        for (GLint textureIndex = 0; textureIndex < vertexActiveTextureCount; ++textureIndex)
        {
            vertexShaderStr << "  color += texture2D(" << vertexPrefix << textureIndex
                            << ", texCoord);\n";
        }

        vertexShaderStr << "}";

        std::stringstream fragmentShaderStr;
        fragmentShaderStr << "varying mediump vec4 color;\n"
                          << "varying mediump vec2 texCoord;\n";

        for (GLint textureIndex = 0; textureIndex < fragmentTextureCount; ++textureIndex)
        {
            fragmentShaderStr << "uniform sampler2D " << fragPrefix << textureIndex << ";\n";
        }

        fragmentShaderStr << "void main() {\n"
                          << "  gl_FragColor = color;\n";

        for (GLint textureIndex = 0; textureIndex < fragmentActiveTextureCount; ++textureIndex)
        {
            fragmentShaderStr << "  gl_FragColor += texture2D(" << fragPrefix << textureIndex
                              << ", texCoord);\n";
        }

        fragmentShaderStr << "}";

        const std::string &vertexShaderSource   = vertexShaderStr.str();
        const std::string &fragmentShaderSource = fragmentShaderStr.str();

        mProgram = CompileProgram(vertexShaderSource, fragmentShaderSource);
    }

    RGBA8 getPixel(GLint texIndex)
    {
        RGBA8 pixel = {static_cast<uint8_t>(texIndex & 0x7u), static_cast<uint8_t>(texIndex >> 3),
                       0, 255u};
        return pixel;
    }

    void initTextures(GLint tex2DCount, GLint texCubeCount)
    {
        GLint totalCount = tex2DCount + texCubeCount;
        mTextures.assign(totalCount, 0);
        glGenTextures(totalCount, &mTextures[0]);
        ASSERT_GL_NO_ERROR();

        std::vector<RGBA8> texData(16 * 16);

        GLint texIndex = 0;
        for (; texIndex < tex2DCount; ++texIndex)
        {
            texData.assign(texData.size(), getPixel(texIndex));
            glActiveTexture(GL_TEXTURE0 + texIndex);
            glBindTexture(GL_TEXTURE_2D, mTextures[texIndex]);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                         &texData[0]);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        }

        ASSERT_GL_NO_ERROR();

        for (; texIndex < texCubeCount; ++texIndex)
        {
            texData.assign(texData.size(), getPixel(texIndex));
            glActiveTexture(GL_TEXTURE0 + texIndex);
            glBindTexture(GL_TEXTURE_CUBE_MAP, mTextures[texIndex]);
            glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
                         GL_UNSIGNED_BYTE, &texData[0]);
            glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
                         GL_UNSIGNED_BYTE, &texData[0]);
            glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
                         GL_UNSIGNED_BYTE, &texData[0]);
            glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
                         GL_UNSIGNED_BYTE, &texData[0]);
            glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
                         GL_UNSIGNED_BYTE, &texData[0]);
            glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
                         GL_UNSIGNED_BYTE, &texData[0]);
            glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
            glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
            glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        }

        ASSERT_GL_NO_ERROR();
    }

    void testWithTextures(GLint vertexTextureCount,
                          const std::string &vertexTexturePrefix,
                          GLint fragmentTextureCount,
                          const std::string &fragmentTexturePrefix)
    {
        // Generate textures
        initTextures(vertexTextureCount + fragmentTextureCount, 0);

        glUseProgram(mProgram);
        RGBA8 expectedSum = {0};
        for (GLint texIndex = 0; texIndex < vertexTextureCount; ++texIndex)
        {
            std::stringstream uniformNameStr;
            uniformNameStr << vertexTexturePrefix << texIndex;
            const std::string &uniformName = uniformNameStr.str();
            GLint location = glGetUniformLocation(mProgram, uniformName.c_str());
            ASSERT_NE(-1, location);

            glUniform1i(location, texIndex);
            RGBA8 contribution = getPixel(texIndex);
            expectedSum.R += contribution.R;
            expectedSum.G += contribution.G;
        }

        for (GLint texIndex = 0; texIndex < fragmentTextureCount; ++texIndex)
        {
            std::stringstream uniformNameStr;
            uniformNameStr << fragmentTexturePrefix << texIndex;
            const std::string &uniformName = uniformNameStr.str();
            GLint location = glGetUniformLocation(mProgram, uniformName.c_str());
            ASSERT_NE(-1, location);

            glUniform1i(location, texIndex + vertexTextureCount);
            RGBA8 contribution = getPixel(texIndex + vertexTextureCount);
            expectedSum.R += contribution.R;
            expectedSum.G += contribution.G;
        }

        ASSERT_GE(256u, expectedSum.G);

        drawQuad(mProgram, "position", 0.5f);
        ASSERT_GL_NO_ERROR();
        EXPECT_PIXEL_EQ(0, 0, expectedSum.R, expectedSum.G, 0, 255);
    }

    GLuint mProgram;
    std::vector<GLuint> mTextures;
    GLint mMaxVertexTextures;
    GLint mMaxFragmentTextures;
    GLint mMaxCombinedTextures;
};

// Test rendering with the maximum vertex texture units.
TEST_P(TextureLimitsTest, MaxVertexTextures)
{
    // TODO(jmadill): Figure out why this fails on Intel.
    if (IsIntel() && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel." << std::endl;
        return;
    }

    compileProgramWithTextureCounts("tex", mMaxVertexTextures, mMaxVertexTextures, "tex", 0, 0);
    ASSERT_NE(0u, mProgram);
    ASSERT_GL_NO_ERROR();

    testWithTextures(mMaxVertexTextures, "tex", 0, "tex");
}

// Test rendering with the maximum fragment texture units.
TEST_P(TextureLimitsTest, MaxFragmentTextures)
{
    // TODO(jmadill): Figure out why this fails on Intel.
    if (IsIntel() && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel." << std::endl;
        return;
    }

    compileProgramWithTextureCounts("tex", 0, 0, "tex", mMaxFragmentTextures, mMaxFragmentTextures);
    ASSERT_NE(0u, mProgram);
    ASSERT_GL_NO_ERROR();

    testWithTextures(mMaxFragmentTextures, "tex", 0, "tex");
}

// Test rendering with maximum combined texture units.
TEST_P(TextureLimitsTest, MaxCombinedTextures)
{
    // TODO(jmadill): Investigate workaround.
    if (IsIntel() && GetParam() == ES2_OPENGL())
    {
        std::cout << "Test skipped on Intel." << std::endl;
        return;
    }

    GLint vertexTextures = mMaxVertexTextures;

    if (vertexTextures + mMaxFragmentTextures > mMaxCombinedTextures)
    {
        vertexTextures = mMaxCombinedTextures - mMaxFragmentTextures;
    }

    compileProgramWithTextureCounts("vtex", vertexTextures, vertexTextures, "ftex",
                                    mMaxFragmentTextures, mMaxFragmentTextures);
    ASSERT_NE(0u, mProgram);
    ASSERT_GL_NO_ERROR();

    testWithTextures(vertexTextures, "vtex", mMaxFragmentTextures, "ftex");
}

// Negative test for exceeding the number of vertex textures
TEST_P(TextureLimitsTest, ExcessiveVertexTextures)
{
    compileProgramWithTextureCounts("tex", mMaxVertexTextures + 1, mMaxVertexTextures + 1, "tex", 0,
                                    0);
    ASSERT_EQ(0u, mProgram);
}

// Negative test for exceeding the number of fragment textures
TEST_P(TextureLimitsTest, ExcessiveFragmentTextures)
{
    compileProgramWithTextureCounts("tex", 0, 0, "tex", mMaxFragmentTextures + 1,
                                    mMaxFragmentTextures + 1);
    ASSERT_EQ(0u, mProgram);
}

// Test active vertex textures under the limit, but excessive textures specified.
TEST_P(TextureLimitsTest, MaxActiveVertexTextures)
{
    // TODO(jmadill): Figure out why this fails on Intel.
    if (IsIntel() && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel." << std::endl;
        return;
    }

    compileProgramWithTextureCounts("tex", mMaxVertexTextures + 4, mMaxVertexTextures, "tex", 0, 0);
    ASSERT_NE(0u, mProgram);
    ASSERT_GL_NO_ERROR();

    testWithTextures(mMaxVertexTextures, "tex", 0, "tex");
}

// Test active fragment textures under the limit, but excessive textures specified.
TEST_P(TextureLimitsTest, MaxActiveFragmentTextures)
{
    // TODO(jmadill): Figure out why this fails on Intel.
    if (IsIntel() && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel." << std::endl;
        return;
    }

    compileProgramWithTextureCounts("tex", 0, 0, "tex", mMaxFragmentTextures + 4,
                                    mMaxFragmentTextures);
    ASSERT_NE(0u, mProgram);
    ASSERT_GL_NO_ERROR();

    testWithTextures(0, "tex", mMaxFragmentTextures, "tex");
}

// Negative test for pointing two sampler uniforms of different types to the same texture.
// GLES 2.0.25 section 2.10.4 page 39.
TEST_P(TextureLimitsTest, TextureTypeConflict)
{
    const std::string &vertexShader =
        "attribute vec2 position;\n"
        "varying float color;\n"
        "uniform sampler2D tex2D;\n"
        "uniform samplerCube texCube;\n"
        "void main() {\n"
        "  gl_Position = vec4(position, 0, 1);\n"
        "  vec2 texCoord = (position * 0.5) + 0.5;\n"
        "  color = texture2D(tex2D, texCoord).x;\n"
        "  color += textureCube(texCube, vec3(texCoord, 0)).x;\n"
        "}";
    const std::string &fragmentShader =
        "varying mediump float color;\n"
        "void main() {\n"
        "  gl_FragColor = vec4(color, 0, 0, 1);\n"
        "}";

    mProgram = CompileProgram(vertexShader, fragmentShader);
    ASSERT_NE(0u, mProgram);

    initTextures(1, 0);

    glUseProgram(mProgram);
    GLint tex2DLocation = glGetUniformLocation(mProgram, "tex2D");
    ASSERT_NE(-1, tex2DLocation);
    GLint texCubeLocation = glGetUniformLocation(mProgram, "texCube");
    ASSERT_NE(-1, texCubeLocation);

    glUniform1i(tex2DLocation, 0);
    glUniform1i(texCubeLocation, 0);
    ASSERT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

// Negative test for rendering with texture outside the valid range.
// TODO(jmadill): Possibly adjust the test according to the spec:
// GLES 3.0.4 section 2.12.7 mentions that specifying an out-of-range sampler uniform value
// generates an INVALID_VALUE error - GLES 2.0 doesn't yet have this mention.
TEST_P(TextureLimitsTest, DrawWithTexturePastMaximum)
{
    const std::string &vertexShader =
        "attribute vec2 position;\n"
        "varying float color;\n"
        "uniform sampler2D tex2D;\n"
        "void main() {\n"
        "  gl_Position = vec4(position, 0, 1);\n"
        "  vec2 texCoord = (position * 0.5) + 0.5;\n"
        "  color = texture2D(tex2D, texCoord).x;\n"
        "}";
    const std::string &fragmentShader =
        "varying mediump float color;\n"
        "void main() {\n"
        "  gl_FragColor = vec4(color, 0, 0, 1);\n"
        "}";

    mProgram = CompileProgram(vertexShader, fragmentShader);
    ASSERT_NE(0u, mProgram);

    glUseProgram(mProgram);
    GLint tex2DLocation = glGetUniformLocation(mProgram, "tex2D");
    ASSERT_NE(-1, tex2DLocation);

    glUniform1i(tex2DLocation, mMaxCombinedTextures);
    ASSERT_GL_NO_ERROR();

    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

class Texture2DNorm16TestES3 : public Texture2DTestES3
{
  protected:
    Texture2DNorm16TestES3() : Texture2DTestES3(), mTextures{0, 0, 0}, mFBO(0), mRenderbuffer(0) {}

    void SetUp() override
    {
        Texture2DTestES3::SetUp();

        glActiveTexture(GL_TEXTURE0);
        glGenTextures(3, mTextures);
        glGenFramebuffers(1, &mFBO);
        glGenRenderbuffers(1, &mRenderbuffer);

        for (size_t textureIndex = 0; textureIndex < 3; textureIndex++)
        {
            glBindTexture(GL_TEXTURE_2D, mTextures[textureIndex]);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        }

        glBindTexture(GL_TEXTURE_2D, 0);

        ASSERT_GL_NO_ERROR();
    }

    void TearDown() override
    {
        glDeleteTextures(3, mTextures);
        glDeleteFramebuffers(1, &mFBO);
        glDeleteRenderbuffers(1, &mRenderbuffer);

        Texture2DTestES3::TearDown();
    }

    void testNorm16Texture(GLint internalformat, GLenum format, GLenum type)
    {
        GLushort pixelValue  = (type == GL_SHORT) ? 0x7FFF : 0x6A35;
        GLushort imageData[] = {pixelValue, pixelValue, pixelValue, pixelValue};

        setUpProgram();

        glBindFramebuffer(GL_FRAMEBUFFER, mFBO);
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTextures[0],
                               0);

        glBindTexture(GL_TEXTURE_2D, mTextures[0]);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16_EXT, 1, 1, 0, GL_RGBA, GL_UNSIGNED_SHORT, nullptr);

        glBindTexture(GL_TEXTURE_2D, mTextures[1]);
        glTexImage2D(GL_TEXTURE_2D, 0, internalformat, 1, 1, 0, format, type, imageData);

        EXPECT_GL_NO_ERROR();

        drawQuad(mProgram, "position", 0.5f);

        GLubyte expectedValue = (type == GL_SHORT) ? 0xFF : static_cast<GLubyte>(pixelValue >> 8);

        EXPECT_PIXEL_COLOR_EQ(
            0, 0, SliceFormatColor(
                      format, GLColor(expectedValue, expectedValue, expectedValue, expectedValue)));

        glBindFramebuffer(GL_FRAMEBUFFER, 0);

        ASSERT_GL_NO_ERROR();
    }

    void testNorm16Render(GLint internalformat, GLenum format, GLenum type)
    {
        GLushort pixelValue = 0x6A35;
        GLushort imageData[] = {pixelValue, pixelValue, pixelValue, pixelValue};

        setUpProgram();

        glBindTexture(GL_TEXTURE_2D, mTextures[1]);
        glTexImage2D(GL_TEXTURE_2D, 0, internalformat, 1, 1, 0, format, type, nullptr);

        glBindFramebuffer(GL_FRAMEBUFFER, mFBO);
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTextures[1],
                               0);

        glBindTexture(GL_TEXTURE_2D, mTextures[2]);
        glTexImage2D(GL_TEXTURE_2D, 0, internalformat, 1, 1, 0, format, type, imageData);

        EXPECT_GL_NO_ERROR();

        drawQuad(mProgram, "position", 0.5f);

        GLubyte expectedValue = static_cast<GLubyte>(pixelValue >> 8);
        EXPECT_PIXEL_COLOR_EQ(
            0, 0, SliceFormatColor(
                      format, GLColor(expectedValue, expectedValue, expectedValue, expectedValue)));

        glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer);
        glRenderbufferStorage(GL_RENDERBUFFER, internalformat, 1, 1);
        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
                                  mRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, 0);
        EXPECT_GL_NO_ERROR();

        glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);

        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, 1, 1);

        EXPECT_PIXEL_COLOR_EQ(0, 0, SliceFormatColor(format, GLColor::white));

        glBindFramebuffer(GL_FRAMEBUFFER, 0);

        ASSERT_GL_NO_ERROR();
    }

    GLuint mTextures[3];
    GLuint mFBO;
    GLuint mRenderbuffer;
};

// Test texture formats enabled by the GL_EXT_texture_norm16 extension.
TEST_P(Texture2DNorm16TestES3, TextureNorm16Test)
{
    if (!extensionEnabled("GL_EXT_texture_norm16"))
    {
        std::cout << "Test skipped due to missing GL_EXT_texture_norm16." << std::endl;
        return;
    }

    testNorm16Texture(GL_R16_EXT, GL_RED, GL_UNSIGNED_SHORT);
    testNorm16Texture(GL_RG16_EXT, GL_RG, GL_UNSIGNED_SHORT);
    testNorm16Texture(GL_RGB16_EXT, GL_RGB, GL_UNSIGNED_SHORT);
    testNorm16Texture(GL_RGBA16_EXT, GL_RGBA, GL_UNSIGNED_SHORT);
    testNorm16Texture(GL_R16_SNORM_EXT, GL_RED, GL_SHORT);
    testNorm16Texture(GL_RG16_SNORM_EXT, GL_RG, GL_SHORT);
    testNorm16Texture(GL_RGB16_SNORM_EXT, GL_RGB, GL_SHORT);
    testNorm16Texture(GL_RGBA16_SNORM_EXT, GL_RGBA, GL_SHORT);

    testNorm16Render(GL_R16_EXT, GL_RED, GL_UNSIGNED_SHORT);
    testNorm16Render(GL_RG16_EXT, GL_RG, GL_UNSIGNED_SHORT);
    testNorm16Render(GL_RGBA16_EXT, GL_RGBA, GL_UNSIGNED_SHORT);
}

// Test that UNPACK_SKIP_IMAGES doesn't have an effect on 2D texture uploads.
// GLES 3.0.4 section 3.8.3.
TEST_P(Texture2DTestES3, UnpackSkipImages2D)
{
    if (IsIntel() && IsDesktopOpenGL())
    {
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }
    // TODO(ynovikov): re-enable once root cause of http://anglebug.com/1429 is fixed
    if (IsAndroid() && IsAdreno() && IsOpenGLES())
    {
        std::cout << "Test skipped on Adreno OpenGLES on Android." << std::endl;
        return;
    }

    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    ASSERT_GL_NO_ERROR();

    // SKIP_IMAGES should not have an effect on uploading 2D textures
    glPixelStorei(GL_UNPACK_SKIP_IMAGES, 1000);
    ASSERT_GL_NO_ERROR();

    std::vector<GLColor> pixelsGreen(128u * 128u, GLColor::green);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 128, 128, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 pixelsGreen.data());
    ASSERT_GL_NO_ERROR();

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 128, 128, GL_RGBA, GL_UNSIGNED_BYTE,
                    pixelsGreen.data());
    ASSERT_GL_NO_ERROR();

    glUseProgram(mProgram);
    drawQuad(mProgram, "position", 0.5f);
    ASSERT_GL_NO_ERROR();

    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that skip defined in unpack parameters is taken into account when determining whether
// unpacking source extends outside unpack buffer bounds.
TEST_P(Texture2DTestES3, UnpackSkipPixelsOutOfBounds)
{
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    ASSERT_GL_NO_ERROR();

    GLBuffer buf;
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buf.get());
    std::vector<GLColor> pixelsGreen(128u * 128u, GLColor::green);
    glBufferData(GL_PIXEL_UNPACK_BUFFER, pixelsGreen.size() * 4u, pixelsGreen.data(),
                 GL_DYNAMIC_COPY);
    ASSERT_GL_NO_ERROR();

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 128, 128, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
    ASSERT_GL_NO_ERROR();

    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 1);
    ASSERT_GL_NO_ERROR();

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 128, 128, GL_RGBA, GL_UNSIGNED_BYTE, 0);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);

    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
    glPixelStorei(GL_UNPACK_SKIP_ROWS, 1);
    ASSERT_GL_NO_ERROR();

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 128, 128, GL_RGBA, GL_UNSIGNED_BYTE, 0);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

// Test that unpacking rows that overlap in a pixel unpack buffer works as expected.
TEST_P(Texture2DTestES3, UnpackOverlappingRowsFromUnpackBuffer)
{
    if (IsD3D11())
    {
        std::cout << "Test skipped on D3D." << std::endl;
        return;
    }
    if (IsOSX() && IsAMD())
    {
        // Incorrect rendering results seen on OSX AMD.
        std::cout << "Test skipped on OSX AMD." << std::endl;
        return;
    }

    const GLuint width            = 8u;
    const GLuint height           = 8u;
    const GLuint unpackRowLength  = 5u;
    const GLuint unpackSkipPixels = 1u;

    setWindowWidth(width);
    setWindowHeight(height);

    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    ASSERT_GL_NO_ERROR();

    GLBuffer buf;
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buf.get());
    std::vector<GLColor> pixelsGreen((height - 1u) * unpackRowLength + width + unpackSkipPixels,
                                     GLColor::green);

    for (GLuint skippedPixel = 0u; skippedPixel < unpackSkipPixels; ++skippedPixel)
    {
        pixelsGreen[skippedPixel] = GLColor(255, 0, 0, 255);
    }

    glBufferData(GL_PIXEL_UNPACK_BUFFER, pixelsGreen.size() * 4u, pixelsGreen.data(),
                 GL_DYNAMIC_COPY);
    ASSERT_GL_NO_ERROR();

    glPixelStorei(GL_UNPACK_ROW_LENGTH, unpackRowLength);
    glPixelStorei(GL_UNPACK_SKIP_PIXELS, unpackSkipPixels);
    ASSERT_GL_NO_ERROR();

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
    ASSERT_GL_NO_ERROR();

    glUseProgram(mProgram);
    drawQuad(mProgram, "position", 0.5f);
    ASSERT_GL_NO_ERROR();

    GLuint windowPixelCount = getWindowWidth() * getWindowHeight();
    std::vector<GLColor> actual(windowPixelCount, GLColor::black);
    glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE,
                 actual.data());
    std::vector<GLColor> expected(windowPixelCount, GLColor::green);
    EXPECT_EQ(expected, actual);
}

template <typename T>
T UNorm(double value)
{
    return static_cast<T>(value * static_cast<double>(std::numeric_limits<T>::max()));
}

// Test rendering a depth texture with mipmaps.
TEST_P(Texture2DTestES3, DepthTexturesWithMipmaps)
{
    //TODO(cwallez) this is failing on Intel Win7 OpenGL
    if (IsIntel() && IsWindows() && IsOpenGL())
    {
        std::cout << "Test skipped on Intel OpenGL." << std::endl;
        return;
    }

    const int size = getWindowWidth();

    auto dim   = [size](int level) { return size >> level; };
    int levels = gl::log2(size);

    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexStorage2D(GL_TEXTURE_2D, levels, GL_DEPTH_COMPONENT24, size, size);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    ASSERT_GL_NO_ERROR();

    glUseProgram(mProgram);
    glUniform1i(mTexture2DUniformLocation, 0);

    std::vector<unsigned char> expected;

    for (int level = 0; level < levels; ++level)
    {
        double value = (static_cast<double>(level) / static_cast<double>(levels - 1));
        expected.push_back(UNorm<unsigned char>(value));

        int levelDim = dim(level);

        ASSERT_GT(levelDim, 0);

        std::vector<unsigned int> initData(levelDim * levelDim, UNorm<unsigned int>(value));
        glTexSubImage2D(GL_TEXTURE_2D, level, 0, 0, levelDim, levelDim, GL_DEPTH_COMPONENT,
                        GL_UNSIGNED_INT, initData.data());
    }
    ASSERT_GL_NO_ERROR();

    for (int level = 0; level < levels; ++level)
    {
        glViewport(0, 0, dim(level), dim(level));
        drawQuad(mProgram, "position", 0.5f);
        GLColor actual = ReadColor(0, 0);
        EXPECT_NEAR(expected[level], actual.R, 10u);
    }

    ASSERT_GL_NO_ERROR();
}

// Tests unpacking into the unsized GL_ALPHA format.
TEST_P(Texture2DTestES3, UnsizedAlphaUnpackBuffer)
{
    // TODO(jmadill): Figure out why this fails on OSX.
    ANGLE_SKIP_TEST_IF(IsOSX());

    // Initialize the texure.
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, getWindowWidth(), getWindowHeight(), 0, GL_ALPHA,
                 GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    std::vector<GLubyte> bufferData(getWindowWidth() * getWindowHeight(), 127);

    // Pull in the color data from the unpack buffer.
    GLBuffer unpackBuffer;
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, unpackBuffer.get());
    glBufferData(GL_PIXEL_UNPACK_BUFFER, getWindowWidth() * getWindowHeight(), bufferData.data(),
                 GL_STATIC_DRAW);

    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, getWindowWidth(), getWindowHeight(), GL_ALPHA,
                    GL_UNSIGNED_BYTE, nullptr);

    // Clear to a weird color to make sure we're drawing something.
    glClearColor(0.5f, 0.8f, 1.0f, 0.2f);
    glClear(GL_COLOR_BUFFER_BIT);

    // Draw with the alpha texture and verify.
    drawQuad(mProgram, "position", 0.5f);

    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 127, 1);
}

// Ensure stale unpack data doesn't propagate in D3D11.
TEST_P(Texture2DTestES3, StaleUnpackData)
{
    // Init unpack buffer.
    GLsizei pixelCount = getWindowWidth() * getWindowHeight() / 2;
    std::vector<GLColor> pixels(pixelCount, GLColor::red);

    GLBuffer unpackBuffer;
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, unpackBuffer.get());
    GLsizei bufferSize = pixelCount * sizeof(GLColor);
    glBufferData(GL_PIXEL_UNPACK_BUFFER, bufferSize, pixels.data(), GL_STATIC_DRAW);

    // Create from unpack buffer.
    glBindTexture(GL_TEXTURE_2D, mTexture2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, getWindowWidth() / 2, getWindowHeight() / 2, 0,
                 GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    drawQuad(mProgram, "position", 0.5f);

    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);

    // Fill unpack with green, recreating buffer.
    pixels.assign(getWindowWidth() * getWindowHeight(), GLColor::green);
    GLsizei size2 = getWindowWidth() * getWindowHeight() * sizeof(GLColor);
    glBufferData(GL_PIXEL_UNPACK_BUFFER, size2, pixels.data(), GL_STATIC_DRAW);

    // Reinit texture with green.
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, getWindowWidth() / 2, getWindowHeight() / 2, GL_RGBA,
                    GL_UNSIGNED_BYTE, nullptr);

    drawQuad(mProgram, "position", 0.5f);

    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// This test covers a D3D format redefinition bug for 3D textures. The base level format was not
// being properly checked, and the texture storage of the previous texture format was persisting.
// This would result in an ASSERT in debug and incorrect rendering in release.
// See http://anglebug.com/1609 and WebGL 2 test conformance2/misc/views-with-offsets.html.
TEST_P(Texture3DTestES3, FormatRedefinitionBug)
{
    GLTexture tex;
    glBindTexture(GL_TEXTURE_3D, tex.get());
    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA8, 1, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer.get());
    glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex.get(), 0, 0);

    glCheckFramebufferStatus(GL_FRAMEBUFFER);

    std::vector<uint8_t> pixelData(100, 0);

    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB565, 1, 1, 1, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, nullptr);
    glTexSubImage3D(GL_TEXTURE_3D, 0, 0, 0, 0, 1, 1, 1, GL_RGB, GL_UNSIGNED_SHORT_5_6_5,
                    pixelData.data());

    ASSERT_GL_NO_ERROR();
}

// Use this to select which configurations (e.g. which renderer, which GLES major version) these tests should be run against.
// TODO(oetuaho): Enable all below tests on OpenGL. Requires a fix for ANGLE bug 1278.
ANGLE_INSTANTIATE_TEST(Texture2DTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(TextureCubeTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(Texture2DTestWithDrawScale,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(Sampler2DAsFunctionParameterTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(SamplerArrayTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(SamplerArrayAsFunctionParameterTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(Texture2DTestES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());
ANGLE_INSTANTIATE_TEST(Texture3DTestES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());
ANGLE_INSTANTIATE_TEST(Texture2DIntegerAlpha1TestES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());
ANGLE_INSTANTIATE_TEST(Texture2DUnsignedIntegerAlpha1TestES3,
                       ES3_D3D11(),
                       ES3_OPENGL(),
                       ES3_OPENGLES());
ANGLE_INSTANTIATE_TEST(ShadowSamplerPlusSampler3DTestES3,
                       ES3_D3D11(),
                       ES3_OPENGL(),
                       ES3_OPENGLES());
ANGLE_INSTANTIATE_TEST(SamplerTypeMixTestES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());
ANGLE_INSTANTIATE_TEST(Texture2DArrayTestES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());
ANGLE_INSTANTIATE_TEST(TextureSizeTextureArrayTest, ES3_D3D11(), ES3_OPENGL());
ANGLE_INSTANTIATE_TEST(SamplerInStructTest,
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_D3D9(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(SamplerInStructAsFunctionParameterTest,
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_D3D9(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(SamplerInStructArrayAsFunctionParameterTest,
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_D3D9(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(SamplerInNestedStructAsFunctionParameterTest,
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_D3D9(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(SamplerInStructAndOtherVariableTest,
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_D3D9(),
                       ES2_OPENGL(),
                       ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(TextureLimitsTest, ES2_D3D11(), ES2_OPENGL(), ES2_OPENGLES());
ANGLE_INSTANTIATE_TEST(Texture2DNorm16TestES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());

}  // anonymous namespace
kc3-lang/angle/src/tests/gl_tests/TextureTest.cpp

Commit

kc3-lang/angle /src/tests/gl_tests/TextureTest.cpp
