FramebufferTest.cpp

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Author : Tim Van Patten
Date : 2020-10-07 15:03:40
Hash : a3d5a6e3
Message : Vulkan: Call onColorDraw in resolveColorWithSubpass We are currently calling onImageRenderPassWrite() on the read render target within resolveColorWithSubpass(). We need to instead call onColorDraw() on the draw render target, since that's what's actually being written. Bug: b/159903491 Test: CQ Change-Id: I577381d91228e132950455d2e872fbb9b066d0c8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2458850 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Tim Van Patten <timvp@google.com>
src/tests/gl_tests/FramebufferTest.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.
//
// Framebuffer tests:
//   Various tests related for Frambuffers.
//

#include "platform/FeaturesD3D.h"
#include "test_utils/ANGLETest.h"
#include "test_utils/gl_raii.h"

using namespace angle;

namespace
{

void ExpectFramebufferCompleteOrUnsupported(GLenum binding)
{
    GLenum status = glCheckFramebufferStatus(binding);
    EXPECT_TRUE(status == GL_FRAMEBUFFER_COMPLETE || status == GL_FRAMEBUFFER_UNSUPPORTED);
}

}  // anonymous namespace

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

    void checkBitCount(GLuint fbo, GLenum channel, GLint minBits)
    {
        glBindFramebuffer(GL_FRAMEBUFFER, fbo);

        GLint bits = 0;
        glGetIntegerv(channel, &bits);

        if (minBits == 0)
        {
            EXPECT_EQ(minBits, bits);
        }
        else
        {
            EXPECT_GE(bits, minBits);
        }
    }

    void testBitCounts(GLuint fbo,
                       GLint minRedBits,
                       GLint minGreenBits,
                       GLint minBlueBits,
                       GLint minAlphaBits,
                       GLint minDepthBits,
                       GLint minStencilBits)
    {
        checkBitCount(fbo, GL_RED_BITS, minRedBits);
        checkBitCount(fbo, GL_GREEN_BITS, minGreenBits);
        checkBitCount(fbo, GL_BLUE_BITS, minBlueBits);
        checkBitCount(fbo, GL_ALPHA_BITS, minAlphaBits);
        checkBitCount(fbo, GL_DEPTH_BITS, minDepthBits);
        checkBitCount(fbo, GL_STENCIL_BITS, minStencilBits);
    }

    void testTextureFormat(GLenum internalFormat,
                           GLint minRedBits,
                           GLint minGreenBits,
                           GLint minBlueBits,
                           GLint minAlphaBits)
    {
        glGenTextures(1, &mTexture);
        glBindTexture(GL_TEXTURE_2D, mTexture);

        if (getClientMajorVersion() >= 3)
        {
            glTexStorage2D(GL_TEXTURE_2D, 1, internalFormat, 1, 1);
        }
        else
        {
            glTexStorage2DEXT(GL_TEXTURE_2D, 1, internalFormat, 1, 1);
        }

        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mTexture, 0);

        testBitCounts(mFramebuffer, minRedBits, minGreenBits, minBlueBits, minAlphaBits, 0, 0);
    }

    void testRenderbufferMultisampleFormat(int minESVersion,
                                           GLenum attachmentType,
                                           GLenum internalFormat)
    {
        int clientVersion = getClientMajorVersion();
        if (clientVersion < minESVersion)
        {
            return;
        }

        // Check that multisample is supported with at least two samples (minimum required is 1)
        bool supports2Samples = false;

        if (clientVersion == 2)
        {
            if (IsGLExtensionEnabled("ANGLE_framebuffer_multisample"))
            {
                int maxSamples;
                glGetIntegerv(GL_MAX_SAMPLES_ANGLE, &maxSamples);
                supports2Samples = maxSamples >= 2;
            }
        }
        else
        {
            assert(clientVersion >= 3);
            int maxSamples;
            glGetIntegerv(GL_MAX_SAMPLES, &maxSamples);
            supports2Samples = maxSamples >= 2;
        }

        if (!supports2Samples)
        {
            return;
        }

        glGenRenderbuffers(1, &mRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer);

        EXPECT_GL_NO_ERROR();
        glRenderbufferStorageMultisampleANGLE(GL_RENDERBUFFER, 2, internalFormat, 128, 128);
        EXPECT_GL_NO_ERROR();
        glFramebufferRenderbuffer(GL_FRAMEBUFFER, attachmentType, GL_RENDERBUFFER, mRenderbuffer);
        EXPECT_GL_NO_ERROR();
    }

    void testZeroHeightRenderbuffer()
    {
        glGenRenderbuffers(1, &mRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer);
        glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 0);
        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
                                  mRenderbuffer);
        EXPECT_GL_NO_ERROR();
    }

    void testSetUp() override
    {
        glGenFramebuffers(1, &mFramebuffer);
        glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer);
    }

    void testTearDown() override
    {
        if (mTexture != 0)
        {
            glDeleteTextures(1, &mTexture);
            mTexture = 0;
        }

        if (mRenderbuffer != 0)
        {
            glDeleteRenderbuffers(1, &mRenderbuffer);
            mRenderbuffer = 0;
        }

        if (mFramebuffer != 0)
        {
            glDeleteFramebuffers(1, &mFramebuffer);
            mFramebuffer = 0;
        }

        if (mProgram != 0)
        {
            glDeleteProgram(mProgram);
            mProgram = 0;
        }
    }

    GLuint mFramebuffer;
    GLuint mTexture;
    GLuint mRenderbuffer;
    GLuint mProgram;
};

TEST_P(FramebufferFormatsTest, RGBA4)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       !IsGLExtensionEnabled("GL_EXT_texture_storage"));

    testTextureFormat(GL_RGBA4, 4, 4, 4, 4);
}

TEST_P(FramebufferFormatsTest, RGB565)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       !IsGLExtensionEnabled("GL_EXT_texture_storage"));

    testTextureFormat(GL_RGB565, 5, 6, 5, 0);
}

TEST_P(FramebufferFormatsTest, RGB8)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       (!IsGLExtensionEnabled("GL_OES_rgb8_rgba8") ||
                        !IsGLExtensionEnabled("GL_EXT_texture_storage")));

    testTextureFormat(GL_RGB8_OES, 8, 8, 8, 0);
}

TEST_P(FramebufferFormatsTest, BGRA8)
{
    ANGLE_SKIP_TEST_IF(
        !IsGLExtensionEnabled("GL_EXT_texture_format_BGRA8888") ||
        (getClientMajorVersion() < 3 && !IsGLExtensionEnabled("GL_EXT_texture_storage")));

    testTextureFormat(GL_BGRA8_EXT, 8, 8, 8, 8);
}

TEST_P(FramebufferFormatsTest, RGBA8)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3 &&
                       (!IsGLExtensionEnabled("GL_OES_rgb8_rgba8") ||
                        !IsGLExtensionEnabled("GL_EXT_texture_storage")));

    testTextureFormat(GL_RGBA8_OES, 8, 8, 8, 8);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH16)
{
    testRenderbufferMultisampleFormat(2, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT16);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH24)
{
    testRenderbufferMultisampleFormat(3, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT24);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH32F)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    testRenderbufferMultisampleFormat(3, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT32F);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH24_STENCIL8)
{
    testRenderbufferMultisampleFormat(3, GL_DEPTH_STENCIL_ATTACHMENT, GL_DEPTH24_STENCIL8);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_DEPTH32F_STENCIL8)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    testRenderbufferMultisampleFormat(3, GL_DEPTH_STENCIL_ATTACHMENT, GL_DEPTH32F_STENCIL8);
}

TEST_P(FramebufferFormatsTest, RenderbufferMultisample_STENCIL_INDEX8)
{
    // TODO(geofflang): Figure out how to support GLSTENCIL_INDEX8 on desktop GL
    ANGLE_SKIP_TEST_IF(IsDesktopOpenGL());

    testRenderbufferMultisampleFormat(2, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX8);
}

// Test that binding an incomplete cube map is rejected by ANGLE.
TEST_P(FramebufferFormatsTest, IncompleteCubeMap)
{
    // http://anglebug.com/3145
    ANGLE_SKIP_TEST_IF(IsFuchsia() && IsIntel() && IsVulkan());

    // First make a complete CubeMap.
    glGenTextures(1, &mTexture);
    glBindTexture(GL_TEXTURE_CUBE_MAP, mTexture);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X,
                           mTexture, 0);

    // Verify the framebuffer is complete.
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Make the CubeMap cube-incomplete.
    glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 nullptr);

    // Verify the framebuffer is incomplete.
    ASSERT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();

    // Verify drawing with the incomplete framebuffer produces a GL error
    mProgram = CompileProgram(essl1_shaders::vs::Simple(), essl1_shaders::fs::Red());
    ASSERT_NE(0u, mProgram);
    drawQuad(mProgram, essl1_shaders::PositionAttrib(), 0.5f);
    ASSERT_GL_ERROR(GL_INVALID_FRAMEBUFFER_OPERATION);
}

// Test that a renderbuffer with zero height but nonzero width is handled without crashes/asserts.
TEST_P(FramebufferFormatsTest, ZeroHeightRenderbuffer)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    testZeroHeightRenderbuffer();
}

// Test to cover a bug where the read framebuffer affects the completeness of the draw framebuffer.
TEST_P(FramebufferFormatsTest, ReadDrawCompleteness)
{
    ANGLE_SKIP_TEST_IF(getClientMajorVersion() < 3);

    GLTexture incompleteTexture;
    glBindTexture(GL_TEXTURE_2D, incompleteTexture);

    GLFramebuffer incompleteFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, incompleteFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, incompleteTexture,
                           0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    GLTexture completeTexture;
    glBindTexture(GL_TEXTURE_2D, completeTexture);
    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, getWindowWidth(), getWindowHeight());

    GLFramebuffer completeFBO;
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, completeFBO);
    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                           completeTexture, 0);

    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_READ_FRAMEBUFFER));
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();

    // Simple draw program.
    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), essl1_shaders::fs::Red());

    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    EXPECT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, completeFBO);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
}

// Test that a renderbuffer with RGB565 format works as expected. This test is intended for some
// back-end having no support for native RGB565 renderbuffer and thus having to emulate using RGBA
// format.
TEST_P(FramebufferFormatsTest, RGB565Renderbuffer)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB565, 1, 1);

    GLFramebuffer completeFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, completeFBO);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();

    glClearColor(1, 0, 0, 0.5f);
    glClear(GL_COLOR_BUFFER_BIT);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
}

class FramebufferTest_ES3 : public ANGLETest
{};

// Covers invalidating an incomplete framebuffer. This should be a no-op, but should not error.
TEST_P(FramebufferTest_ES3, InvalidateIncomplete)
{
    GLFramebuffer framebuffer;
    GLRenderbuffer renderbuffer;

    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    std::vector<GLenum> attachments;
    attachments.push_back(GL_COLOR_ATTACHMENT0);

    glInvalidateFramebuffer(GL_FRAMEBUFFER, 1, attachments.data());
    EXPECT_GL_NO_ERROR();
}

// Covers sub-invalidating an incomplete framebuffer. This should be a no-op, but should not error.
TEST_P(FramebufferTest_ES3, SubInvalidateIncomplete)
{
    GLFramebuffer framebuffer;
    GLRenderbuffer renderbuffer;

    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    std::vector<GLenum> attachments;
    attachments.push_back(GL_COLOR_ATTACHMENT0);

    glInvalidateSubFramebuffer(GL_FRAMEBUFFER, 1, attachments.data(), 5, 5, 10, 10);
    EXPECT_GL_NO_ERROR();
}

// Test that the framebuffer state tracking robustly handles a depth-only attachment being set
// as a depth-stencil attachment. It is equivalent to detaching the depth-stencil attachment.
TEST_P(FramebufferTest_ES3, DepthOnlyAsDepthStencil)
{
    GLFramebuffer framebuffer;
    GLRenderbuffer renderbuffer;

    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, 4, 4);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER,
                              renderbuffer);
    EXPECT_GLENUM_NE(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
}

// Test that the framebuffer correctly returns that it is not complete if invalid texture mip levels
// are bound
TEST_P(FramebufferTest_ES3, TextureAttachmentMipLevels)
{
    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture);

    // Create a complete mip chain in mips 1 to 3
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexImage2D(GL_TEXTURE_2D, 3, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    // Create another complete mip chain in mips 4 to 5
    glTexImage2D(GL_TEXTURE_2D, 4, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexImage2D(GL_TEXTURE_2D, 5, GL_RGBA8, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    // Create a non-complete mip chain in mip 6
    glTexImage2D(GL_TEXTURE_2D, 6, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    // Incomplete, mipLevel != baseLevel and texture is not mip complete
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    // Complete, mipLevel == baseLevel
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Complete, mipLevel != baseLevel but texture is now mip complete
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 2);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 3);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Incomplete, attached level below the base level
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 2);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    // Incomplete, attached level is beyond effective max level
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 4);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    // Complete, mipLevel == baseLevel
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 4);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Complete, mipLevel != baseLevel but texture is now mip complete
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 5);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);

    // Complete, mipLevel == baseLevel
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 6);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 6);
    ExpectFramebufferCompleteOrUnsupported(GL_FRAMEBUFFER);
}

TEST_P(FramebufferTest_ES3, TextureAttachmentMipLevelsReadBack)
{
#if defined(ADDRESS_SANITIZER)
    // http://anglebug.com/4737
    ANGLE_SKIP_TEST_IF(IsOSX());
#endif

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture);

    const std::array<GLColor, 2 * 2> mip0Data = {GLColor::red, GLColor::red, GLColor::red,
                                                 GLColor::red};
    const std::array<GLColor, 1 * 1> mip1Data = {GLColor::green};

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE, mip0Data.data());
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, mip1Data.data());

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 1);
    EXPECT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glClearColor(0, 0, 1.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
}

// TextureAttachmentMipLevelsReadBackWithDraw is a copy of TextureAttachmentMipLevelsReadBack except
// for adding a draw after the last clear. The draw forces ANGLE's Vulkan backend to use the
// framebuffer that is level 1 of the texture which will trigger the mismatch use of the GL level
// and Vulkan level in referring to that rendertarget.
TEST_P(FramebufferTest_ES3, TextureAttachmentMipLevelsReadBackWithDraw)
{
#if defined(ADDRESS_SANITIZER)
    // http://anglebug.com/4737
    ANGLE_SKIP_TEST_IF(IsOSX());
#endif

    ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture);

    const std::array<GLColor, 2 * 2> mip0Data = {GLColor::red, GLColor::red, GLColor::red,
                                                 GLColor::red};
    const std::array<GLColor, 1 * 1> mip1Data = {GLColor::green};

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE, mip0Data.data());
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, mip1Data.data());

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 1);
    EXPECT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glClearColor(0, 0, 1.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    // This draw triggers the use of the framebuffer
    glUseProgram(greenProgram);
    drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test that passing an attachment COLOR_ATTACHMENTm where m is equal to MAX_COLOR_ATTACHMENTS
// generates an INVALID_OPERATION.
// OpenGL ES Version 3.0.5 (November 3, 2016), 4.4.2.4 Attaching Texture Images to a Framebuffer, p.
// 208
TEST_P(FramebufferTest_ES3, ColorAttachmentIndexOutOfBounds)
{
    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer.get());

    GLint maxColorAttachments = 0;
    glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &maxColorAttachments);
    GLenum attachment = static_cast<GLenum>(maxColorAttachments + GL_COLOR_ATTACHMENT0);

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D, texture.get());
    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA32F, 1, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, texture.get(), 0);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

// Check that depth-only attachments report the correct number of samples.
TEST_P(FramebufferTest_ES3, MultisampleDepthOnly)
{
    GLRenderbuffer renderbuffer;
    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
    glRenderbufferStorageMultisample(GL_RENDERBUFFER, 2, GL_DEPTH_COMPONENT24, 32, 32);

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, renderbuffer);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
    EXPECT_GL_NO_ERROR();

    GLint samples = 0;
    glGetIntegerv(GL_SAMPLES, &samples);
    EXPECT_GL_NO_ERROR();
    EXPECT_GE(samples, 2);
}

// Check that we only compare width and height of attachments, not depth.
TEST_P(FramebufferTest_ES3, AttachmentWith3DLayers)
{
    GLTexture texA;
    glBindTexture(GL_TEXTURE_2D, texA);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 4, 4, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    GLTexture texB;
    glBindTexture(GL_TEXTURE_3D, texB);
    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA8, 4, 4, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texA, 0);
    glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, texB, 0, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
    EXPECT_GL_NO_ERROR();
}

// Test that clearing the stencil buffer when the framebuffer only has a color attachment does not
// crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentStencil)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    GLint clearValue = 0;
    glClearBufferiv(GL_STENCIL, 0, &clearValue);

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing the depth buffer when the framebuffer only has a color attachment does not
// crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentDepth)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    GLfloat clearValue = 0.0f;
    glClearBufferfv(GL_DEPTH, 0, &clearValue);

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing a nonexistent color attachment does not crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentColor)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    std::vector<GLfloat> clearValue = {{0.0f, 1.0f, 0.0f, 1.0f}};
    glClearBufferfv(GL_COLOR, 1, clearValue.data());

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing the depth and stencil buffers when the framebuffer only has a color attachment
// does not crash.
TEST_P(FramebufferTest_ES3, ClearNonexistentDepthStencil)
{
    GLRenderbuffer rbo;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

    glClearBufferfi(GL_DEPTH_STENCIL, 0, 0.0f, 0);

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op.
    EXPECT_GL_NO_ERROR();
}

// Test that clearing a color attachment that has been deleted doesn't crash.
TEST_P(FramebufferTest_ES3, ClearDeletedAttachment)
{
    // An INVALID_FRAMEBUFFER_OPERATION error was seen in this test on Mac, not sure where it might
    // be originating from. http://anglebug.com/2834
    ANGLE_SKIP_TEST_IF(IsOSX() && IsOpenGL());

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // There used to be a bug where some draw buffer state used to remain set even after the
    // attachment was detached via deletion. That's why we create, attach and delete this RBO here.
    GLuint rbo = 0u;
    glGenRenderbuffers(1, &rbo);
    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);
    glDeleteRenderbuffers(1, &rbo);

    // There needs to be at least one color attachment to prevent early out from the clear calls.
    GLRenderbuffer rbo2;
    glBindRenderbuffer(GL_RENDERBUFFER, rbo2);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, 1, 1);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_RENDERBUFFER, rbo2);

    ASSERT_GL_NO_ERROR();

    // There's no error specified for clearing nonexistent buffers, it's simply a no-op, so we
    // expect no GL errors below.
    std::array<GLfloat, 4> floatClearValue = {0.0f, 0.0f, 0.0f, 0.0f};
    glClearBufferfv(GL_COLOR, 0, floatClearValue.data());
    EXPECT_GL_NO_ERROR();
    std::array<GLuint, 4> uintClearValue = {0u, 0u, 0u, 0u};
    glClearBufferuiv(GL_COLOR, 0, uintClearValue.data());
    EXPECT_GL_NO_ERROR();
    std::array<GLint, 4> intClearValue = {0, 0, 0, 0};
    glClearBufferiv(GL_COLOR, 0, intClearValue.data());
    EXPECT_GL_NO_ERROR();
}

// Test that resizing the color attachment is handled correctly.
TEST_P(FramebufferTest_ES3, ResizeColorAttachmentSmallToLarge)
{
    GLFramebuffer fbo;
    GLTexture smallTexture;
    GLTexture largeTexture;

    ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
    ANGLE_GL_PROGRAM(blueProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Blue());

    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // Bind the small texture
    glBindTexture(GL_TEXTURE_2D, smallTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, smallTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the small texture
    glUseProgram(greenProgram);
    drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ((getWindowWidth() / 2) - 1, (getWindowHeight() / 2) - 1, GLColor::green);

    // Change the attachment to the larger texture that fills the window
    glBindTexture(GL_TEXTURE_2D, largeTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, largeTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the large texture
    glUseProgram(blueProgram);
    drawQuad(blueProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(getWindowWidth() - 1, getWindowHeight() - 1, GLColor::blue);
}

// Test that resizing the color attachment is handled correctly.
TEST_P(FramebufferTest_ES3, ResizeColorAttachmentLargeToSmall)
{
    GLFramebuffer fbo;
    GLTexture smallTexture;
    GLTexture largeTexture;

    ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
    ANGLE_GL_PROGRAM(blueProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Blue());

    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // Bind the large texture
    glBindTexture(GL_TEXTURE_2D, largeTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, largeTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the large texture
    glUseProgram(blueProgram);
    drawQuad(blueProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(getWindowWidth() - 1, getWindowHeight() - 1, GLColor::blue);

    // Change the attachment to the smaller texture
    glBindTexture(GL_TEXTURE_2D, smallTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, smallTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the small texture
    glUseProgram(greenProgram);
    drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ((getWindowWidth() / 2) - 1, (getWindowHeight() / 2) - 1, GLColor::green);
}

// Test that resizing the texture is handled correctly.
TEST_P(FramebufferTest_ES3, ResizeTextureLargeToSmall)
{
    GLFramebuffer fbo;
    GLTexture texture;

    ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
    ANGLE_GL_PROGRAM(blueProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Blue());

    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // Allocate a large texture
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the large texture
    glUseProgram(blueProgram);
    drawQuad(blueProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(getWindowWidth() - 1, getWindowHeight() - 1, GLColor::blue);

    // Shrink the texture
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the small texture
    glUseProgram(greenProgram);
    drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ((getWindowWidth() / 2) - 1, (getWindowHeight() / 2) - 1, GLColor::green);
}

// Test that resizing the texture is handled correctly.
TEST_P(FramebufferTest_ES3, ResizeTextureSmallToLarge)
{
    GLFramebuffer fbo;
    GLTexture texture;

    ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
    ANGLE_GL_PROGRAM(blueProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Blue());

    glBindFramebuffer(GL_FRAMEBUFFER, fbo);

    // Allocate a small texture
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the large texture
    glUseProgram(blueProgram);
    drawQuad(blueProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ((getWindowWidth() / 2) - 1, (getWindowHeight() / 2) - 1, GLColor::blue);

    // Grow the texture
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Draw to FBO backed by the small texture
    glUseProgram(greenProgram);
    drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ(getWindowWidth() - 1, getWindowHeight() - 1, GLColor::green);
}

// Test that fewer outputs than framebuffer attachments doesn't crash.  This causes a Vulkan
// validation warning, but should not be fatal.
TEST_P(FramebufferTest_ES3, FewerShaderOutputsThanAttachments)
{
    constexpr char kFS[] = R"(#version 300 es
precision highp float;

layout(location = 0) out vec4 color0;
layout(location = 1) out vec4 color1;
layout(location = 2) out vec4 color2;

void main()
{
    color0 = vec4(1.0, 0.0, 0.0, 1.0);
    color1 = vec4(0.0, 1.0, 0.0, 1.0);
    color2 = vec4(0.0, 0.0, 1.0, 1.0);
}
)";

    ANGLE_GL_PROGRAM(program, essl3_shaders::vs::Simple(), kFS);

    constexpr GLint kDrawBufferCount = 4;

    GLint maxDrawBuffers;
    glGetIntegerv(GL_MAX_DRAW_BUFFERS, &maxDrawBuffers);
    ASSERT_GE(maxDrawBuffers, kDrawBufferCount);

    GLTexture textures[kDrawBufferCount];

    for (GLint texIndex = 0; texIndex < kDrawBufferCount; ++texIndex)
    {
        glBindTexture(GL_TEXTURE_2D, textures[texIndex]);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 0, GL_RGBA,
                     GL_UNSIGNED_BYTE, nullptr);
    }

    GLenum allBufs[kDrawBufferCount] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1,
                                        GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3};

    GLFramebuffer fbo;
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);

    // Enable all draw buffers.
    for (GLint texIndex = 0; texIndex < kDrawBufferCount; ++texIndex)
    {
        glBindTexture(GL_TEXTURE_2D, textures[texIndex]);
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + texIndex, GL_TEXTURE_2D,
                               textures[texIndex], 0);
    }
    glDrawBuffers(kDrawBufferCount, allBufs);

    // Draw with simple program.
    drawQuad(program, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();
}

class FramebufferTest_ES31 : public ANGLETest
{
  protected:
    void validateSamplePass(GLuint &query, GLuint &passedCount, GLint width, GLint height)
    {
        glUniform2i(0, width - 1, height - 1);
        glBeginQuery(GL_ANY_SAMPLES_PASSED, query);
        glDrawArrays(GL_TRIANGLES, 0, 6);
        glEndQuery(GL_ANY_SAMPLES_PASSED);
        glGetQueryObjectuiv(query, GL_QUERY_RESULT, &passedCount);
        EXPECT_GT(static_cast<GLint>(passedCount), 0);

        glUniform2i(0, width - 1, height);
        glBeginQuery(GL_ANY_SAMPLES_PASSED, query);
        glDrawArrays(GL_TRIANGLES, 0, 6);
        glEndQuery(GL_ANY_SAMPLES_PASSED);
        glGetQueryObjectuiv(query, GL_QUERY_RESULT, &passedCount);
        EXPECT_EQ(static_cast<GLint>(passedCount), 0);

        glUniform2i(0, width, height - 1);
        glBeginQuery(GL_ANY_SAMPLES_PASSED, query);
        glDrawArrays(GL_TRIANGLES, 0, 6);
        glEndQuery(GL_ANY_SAMPLES_PASSED);
        glGetQueryObjectuiv(query, GL_QUERY_RESULT, &passedCount);
        EXPECT_EQ(static_cast<GLint>(passedCount), 0);
    }

    static constexpr char kFSWriteRedGreen[] = R"(#extension GL_EXT_draw_buffers : enable
precision highp float;
void main()
{
    gl_FragData[0] = vec4(1.0, 0.0, 0.0, 1.0);  // attachment 0: red
    gl_FragData[1] = vec4(0.0, 1.0, 0.0, 1.0);  // attachment 1: green
})";
};

// Until C++17, need to redundantly declare the constexpr array members outside the class.
constexpr char FramebufferTest_ES31::kFSWriteRedGreen[];

// Test that without attachment, if either the value of FRAMEBUFFER_DEFAULT_WIDTH or
// FRAMEBUFFER_DEFAULT_HEIGHT parameters is zero, the framebuffer is incomplete.
TEST_P(FramebufferTest_ES31, IncompleteMissingAttachmentDefaultParam)
{
    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 1);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 0);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 1);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, 0);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, 1);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that the sample count of a mix of texture and renderbuffer should be same.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleSampleCountMix)
{
    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    // Lookup the supported number of sample counts (rely on fact that ANGLE uses the same set of
    // sample counts for textures and renderbuffers)
    GLint numSampleCounts = 0;
    std::vector<GLint> sampleCounts;
    GLsizei queryBufferSize = 1;
    glGetInternalformativ(GL_TEXTURE_2D_MULTISAMPLE, GL_RGBA8, GL_NUM_SAMPLE_COUNTS,
                          queryBufferSize, &numSampleCounts);
    ANGLE_SKIP_TEST_IF((numSampleCounts < 2));
    sampleCounts.resize(numSampleCounts);
    queryBufferSize = numSampleCounts;
    glGetInternalformativ(GL_TEXTURE_2D_MULTISAMPLE, GL_RGBA8, GL_SAMPLES, queryBufferSize,
                          sampleCounts.data());

    GLTexture mTexture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTexture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, sampleCounts[0], GL_RGBA8, 1, 1, true);

    GLRenderbuffer mRenderbuffer;
    glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer.get());
    glRenderbufferStorageMultisample(GL_RENDERBUFFER, sampleCounts[1], GL_RGBA8, 1, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTexture.get(), 0);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_RENDERBUFFER,
                              mRenderbuffer.get());
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that the sample count of texture attachments should be same.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleSampleCountTex)
{
    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    // Lookup the supported number of sample counts
    GLint numSampleCounts = 0;
    std::vector<GLint> sampleCounts;
    GLsizei queryBufferSize = 1;
    glGetInternalformativ(GL_TEXTURE_2D_MULTISAMPLE, GL_RGBA8, GL_NUM_SAMPLE_COUNTS,
                          queryBufferSize, &numSampleCounts);
    ANGLE_SKIP_TEST_IF((numSampleCounts < 2));
    sampleCounts.resize(numSampleCounts);
    queryBufferSize = numSampleCounts;
    glGetInternalformativ(GL_TEXTURE_2D_MULTISAMPLE, GL_RGBA8, GL_SAMPLES, queryBufferSize,
                          sampleCounts.data());

    GLTexture mTextures[2];
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[0].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, sampleCounts[0], GL_RGBA8, 1, 1, true);
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[1].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, sampleCounts[1], GL_RGBA8, 1, 1, true);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[0].get(), 0);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[1].get(), 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that if the attached images are a mix of renderbuffers and textures, the value of
// TEXTURE_FIXED_SAMPLE_LOCATIONS must be TRUE for all attached textures.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleFixedSampleLocationsMix)
{
    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    GLTexture mTexture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTexture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGBA8, 1, 1, false);

    GLRenderbuffer mRenderbuffer;
    glBindRenderbuffer(GL_RENDERBUFFER, mRenderbuffer.get());
    glRenderbufferStorageMultisample(GL_RENDERBUFFER, 1, GL_RGBA8, 1, 1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTexture.get(), 0);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_RENDERBUFFER,
                              mRenderbuffer.get());
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test that the value of TEXTURE_FIXED_SAMPLE_LOCATIONS is the same for all attached textures.
TEST_P(FramebufferTest_ES31, IncompleteMultisampleFixedSampleLocationsTex)
{
    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, mFramebuffer.get());

    GLTexture mTextures[2];
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[0].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGBA8, 1, 1, false);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[0].get(), 0);
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, mTextures[1].get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 1, GL_RGB8, 1, 1, true);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D_MULTISAMPLE,
                           mTextures[1].get(), 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE,
                     glCheckFramebufferStatus(GL_FRAMEBUFFER));

    ASSERT_GL_NO_ERROR();
}

// Test resolving a multisampled texture with blit
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlit)
{
    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(gradientProgram, essl31_shaders::vs::Passthrough(),
                     essl31_shaders::fs::RedGreenGradient());
    drawQuad(gradientProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture;
    GLFramebuffer resolveFBO;
    glBindTexture(GL_TEXTURE_2D, resolveTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow
}

// Test resolving a multisampled texture with blit to a different format
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitDifferentFormats)
{
    ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_texture_format_BGRA8888"));

    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(gradientProgram, essl31_shaders::vs::Passthrough(),
                     essl31_shaders::fs::RedGreenGradient());
    drawQuad(gradientProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture;
    GLFramebuffer resolveFBO;
    glBindTexture(GL_TEXTURE_2D, resolveTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA8_EXT, kSize, kSize, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE,
                 nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow
}

// Test resolving a multisampled texture with blit after drawing to mulitiple FBOs.
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitMultipleFBOs)
{
    // FBO 1 -> multisample draw (red)
    // FBO 2 -> multisample draw (green)
    // Bind FBO 1 as read
    // Bind FBO 3 as draw
    // Resolve

    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBORed;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBORed.get());

    GLTexture textureRed;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, textureRed.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           textureRed.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(redProgram, essl31_shaders::vs::Simple(), essl31_shaders::fs::Red());
    drawQuad(redProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    GLFramebuffer msaaFBOGreen;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBOGreen.get());

    GLTexture textureGreen;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, textureGreen.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           textureGreen.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(greenProgram, essl31_shaders::vs::Simple(), essl31_shaders::fs::Green());
    drawQuad(greenProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture;
    GLFramebuffer resolveFBO;
    glBindTexture(GL_TEXTURE_2D, resolveTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBORed);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
}

// Test resolving a multisampled texture with blit after drawing to mulitiple FBOs.
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitMultipleResolves)
{
    // Draw multisampled in FBO 1
    // Bind FBO 1 as read
    // Bind FBO 2 as draw
    // Resolve
    // Bind FBO 3 as draw
    // Resolve

    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBORed;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBORed.get());

    GLTexture textureRed;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, textureRed.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           textureRed.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(redProgram, essl31_shaders::vs::Simple(), essl31_shaders::fs::Red());
    drawQuad(redProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture1;
    GLFramebuffer resolveFBO1;
    glBindTexture(GL_TEXTURE_2D, resolveTexture1);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture1, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBORed);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO1);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO1);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture2;
    GLFramebuffer resolveFBO2;
    glBindTexture(GL_TEXTURE_2D, resolveTexture2);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO2);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture2, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBORed);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO2);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO2);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
}

// Test resolving a multisampled texture with blit into an FBO with different read and draw
// attachments.
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitDifferentReadDrawBuffers)
{
    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(gradientProgram, essl31_shaders::vs::Passthrough(),
                     essl31_shaders::fs::RedGreenGradient());
    drawQuad(gradientProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLFramebuffer resolveFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);

    // Bind both read and draw textures as separate attachments.
    const std::vector<GLColor> blueColors(kSize * kSize, GLColor::blue);
    GLTexture resolveReadTexture;
    glBindTexture(GL_TEXTURE_2D, resolveReadTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                 blueColors.data());
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveReadTexture,
                           0);
    glReadBuffer(GL_COLOR_ATTACHMENT0);
    ASSERT_GL_NO_ERROR();

    GLTexture resolveDrawTexture;
    glBindTexture(GL_TEXTURE_2D, resolveDrawTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, resolveDrawTexture,
                           0);
    // Only enable color attachment 1 to be drawn to, since the Vulkan back end (currently) only
    // supports using resolve attachments when there is a single draw attachment enabled. This
    // ensures that the read and draw images are treated separately, including their layouts.
    GLenum drawBuffers[] = {GL_NONE, GL_COLOR_ATTACHMENT1};
    glDrawBuffers(2, drawBuffers);
    ASSERT_GL_NO_ERROR();
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    glReadBuffer(GL_COLOR_ATTACHMENT1);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow
}

// Test resolving a multisampled texture into a mipmaped texture with blit
TEST_P(FramebufferTest_ES31, MultisampleResolveIntoMipMapWithBlit)
{
    // FBO 1 is attached to a 64x64 texture
    // FBO 2 attached to level 1 of a 128x128 texture

    constexpr int kSize = 64;
    glViewport(0, 0, kSize, kSize);

    // Create the textures early and call glGenerateMipmap() so it doesn't break the render pass
    // between the drawQuad() and glBlitFramebuffer(), so we can test the resolve with subpass path
    // in the Vulkan back end.
    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();

    GLTexture resolveTexture;
    glBindTexture(GL_TEXTURE_2D, resolveTexture);
    glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 1);
    ASSERT_GL_NO_ERROR();

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(gradientProgram, essl31_shaders::vs::Passthrough(),
                     essl31_shaders::fs::RedGreenGradient());
    drawQuad(gradientProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLFramebuffer resolveFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture, 1);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 251, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 251, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 251, 251, 0, 255, 1.0);  // Yellow
}

// Test resolving a multisampled texture with blit after drawing to multiple FBOs.
TEST_P(FramebufferTest_ES31, MultipleTextureMultisampleResolveWithBlitMultipleResolves)
{
    // Attach two MSAA textures to FBO1
    // Set read buffer 0
    // Resolve into FBO2
    // Set read buffer 1
    // Resolve into FBO3

    ANGLE_SKIP_TEST_IF(!EnsureGLExtensionEnabled("GL_EXT_draw_buffers"));

    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture msaaTextureRed;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, msaaTextureRed.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           msaaTextureRed.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    GLTexture msaaTextureGreen;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, msaaTextureGreen.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D_MULTISAMPLE,
                           msaaTextureGreen.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Setup program to render red into attachment 0 and green into attachment 1.
    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), kFSWriteRedGreen);
    glUseProgram(program);
    constexpr GLenum kDrawBuffers[] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};
    glDrawBuffers(2, kDrawBuffers);

    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture1;
    GLFramebuffer resolveFBO1;
    glBindTexture(GL_TEXTURE_2D, resolveTexture1);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture1, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO1);
    glReadBuffer(GL_COLOR_ATTACHMENT0);  // Red
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO1);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture2;
    GLFramebuffer resolveFBO2;
    glBindTexture(GL_TEXTURE_2D, resolveTexture2);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO2);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture2, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO2);
    glReadBuffer(GL_COLOR_ATTACHMENT1);  // Green
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO2);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Test resolving a multisampled texture with blit after drawing to multiple FBOs, with color
// attachment 1 resolved first.
TEST_P(FramebufferTest_ES31,
       MultipleTextureMultisampleResolveWithBlitMultipleResolvesAttachment1First)
{
    // Attach two MSAA textures to FBO1
    // Set read buffer 1
    // Resolve into FBO2
    // Set read buffer 0
    // Resolve into FBO3

    ANGLE_SKIP_TEST_IF(!EnsureGLExtensionEnabled("GL_EXT_draw_buffers"));

    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture msaaTextureRed;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, msaaTextureRed.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           msaaTextureRed.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    GLTexture msaaTextureGreen;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, msaaTextureGreen.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D_MULTISAMPLE,
                           msaaTextureGreen.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Setup program to render red into attachment 0 and green into attachment 1.
    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), kFSWriteRedGreen);
    glUseProgram(program);
    constexpr GLenum kDrawBuffers[] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};
    glDrawBuffers(2, kDrawBuffers);

    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture1;
    GLFramebuffer resolveFBO1;
    glBindTexture(GL_TEXTURE_2D, resolveTexture1);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture1, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO1);
    glReadBuffer(GL_COLOR_ATTACHMENT1);  // Green
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO1);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture2;
    GLFramebuffer resolveFBO2;
    glBindTexture(GL_TEXTURE_2D, resolveTexture2);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO2);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture2, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO2);
    glReadBuffer(GL_COLOR_ATTACHMENT0);  // Red
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO2);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
}

// Test resolving a multisampled texture with blit, then drawing multisampled again.  The latter
// should not get re-resolved automatically.
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitThenDraw)
{
    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(gradientProgram, essl31_shaders::vs::Passthrough(),
                     essl31_shaders::fs::RedGreenGradient());
    drawQuad(gradientProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture;
    GLFramebuffer resolveFBO;
    glBindTexture(GL_TEXTURE_2D, resolveTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow

    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, msaaFBO);
    ANGLE_GL_PROGRAM(blueProgram, essl3_shaders::vs::Passthrough(), essl3_shaders::fs::Blue());
    drawQuad(blueProgram, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // The resolved FBO should be unaffected by the last draw call.
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow
}

// Test resolving a multisampled texture with blit, then drawing multisampled again.  The latter
// should not get re-resolved automatically.  Resoloves color attachment 1.
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitThenDrawAttachment1)
{
    ANGLE_SKIP_TEST_IF(!EnsureGLExtensionEnabled("GL_EXT_draw_buffers"));

    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture msaaTextureRed;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, msaaTextureRed.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           msaaTextureRed.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    GLTexture msaaTextureGreen;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, msaaTextureGreen.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D_MULTISAMPLE,
                           msaaTextureGreen.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Setup program to render red into attachment 0 and green into attachment 1.
    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), kFSWriteRedGreen);
    glUseProgram(program);
    constexpr GLenum kDrawBuffers[] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};
    glDrawBuffers(2, kDrawBuffers);

    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture;
    GLFramebuffer resolveFBO;
    glBindTexture(GL_TEXTURE_2D, resolveTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glReadBuffer(GL_COLOR_ATTACHMENT1);  // Green
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ(0, kSize - 1, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::green);

    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, msaaFBO);
    ANGLE_GL_PROGRAM(blueProgram, essl3_shaders::vs::Passthrough(), essl3_shaders::fs::Blue());
    drawQuad(blueProgram, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // The resolved FBO should be unaffected by the last draw call.
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, 0, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ(0, kSize - 1, GLColor::green);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::green);
}

// Test resolving a multisampled texture with blit, then drawing multisampled again and resolving to
// same framebuffer.
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitThenDrawThenResolveAgain)
{
    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(gradientProgram, essl31_shaders::vs::Passthrough(),
                     essl31_shaders::fs::RedGreenGradient());
    drawQuad(gradientProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture;
    GLFramebuffer resolveFBO;
    glBindTexture(GL_TEXTURE_2D, resolveTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow

    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, msaaFBO);
    ANGLE_GL_PROGRAM(blueProgram, essl3_shaders::vs::Passthrough(), essl3_shaders::fs::Blue());
    drawQuad(blueProgram, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    // Verify that the resolve happened correctly
    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(0, kSize - 1, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::blue);
}

// Test resolving a multisampled texture with blit, then drawing multisampled again and resolving to
// another framebuffer.
TEST_P(FramebufferTest_ES31, MultisampleResolveWithBlitThenDrawThenResolveAgainToDifferentFBO)
{
    constexpr int kSize = 16;
    glViewport(0, 0, kSize, kSize);

    GLFramebuffer msaaFBO;
    glBindFramebuffer(GL_FRAMEBUFFER, msaaFBO.get());

    GLTexture texture;
    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, texture.get());
    glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, kSize, kSize, false);
    ASSERT_GL_NO_ERROR();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE,
                           texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ANGLE_GL_PROGRAM(gradientProgram, essl31_shaders::vs::Passthrough(),
                     essl31_shaders::fs::RedGreenGradient());
    drawQuad(gradientProgram, essl31_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture1;
    GLFramebuffer resolveFBO1;
    glBindTexture(GL_TEXTURE_2D, resolveTexture1);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO1);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture1, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO1);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO1);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow

    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, msaaFBO);
    ANGLE_GL_PROGRAM(blueProgram, essl3_shaders::vs::Passthrough(), essl3_shaders::fs::Blue());
    drawQuad(blueProgram, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();

    // Create another FBO to resolve the multisample buffer into.
    GLTexture resolveTexture2;
    GLFramebuffer resolveFBO2;
    glBindTexture(GL_TEXTURE_2D, resolveTexture2);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindFramebuffer(GL_FRAMEBUFFER, resolveFBO2);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, resolveTexture2, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glBindFramebuffer(GL_READ_FRAMEBUFFER, msaaFBO);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, resolveFBO2);
    glBlitFramebuffer(0, 0, kSize, kSize, 0, 0, kSize, kSize, GL_COLOR_BUFFER_BIT, GL_NEAREST);
    ASSERT_GL_NO_ERROR();

    // Verify that the resolve happened to the correct FBO
    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO2);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, 0, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(0, kSize - 1, GLColor::blue);
    EXPECT_PIXEL_COLOR_EQ(kSize - 1, kSize - 1, GLColor::blue);

    // The first resolve FBO should be untouched.
    glBindFramebuffer(GL_READ_FRAMEBUFFER, resolveFBO1);
    EXPECT_PIXEL_NEAR(0, 0, 0, 0, 0, 255, 1.0);                      // Black
    EXPECT_PIXEL_NEAR(kSize - 1, 1, 239, 0, 0, 255, 1.0);            // Red
    EXPECT_PIXEL_NEAR(0, kSize - 1, 0, 239, 0, 255, 1.0);            // Green
    EXPECT_PIXEL_NEAR(kSize - 1, kSize - 1, 239, 239, 0, 255, 1.0);  // Yellow
}

// If there are no attachments, rendering will be limited to a rectangle having a lower left of
// (0, 0) and an upper right of(width, height), where width and height are the framebuffer
// object's default width and height.
TEST_P(FramebufferTest_ES31, RenderingLimitToDefaultFBOSizeWithNoAttachments)
{
    // anglebug.com/2253
    ANGLE_SKIP_TEST_IF(IsLinux() && IsAMD() && IsDesktopOpenGL());
    // Occlusion query reports fragments outside the render area are still rendered
    ANGLE_SKIP_TEST_IF(IsAndroid() || (IsWindows() && (IsIntel() || IsAMD())));

    constexpr char kVS1[] = R"(#version 310 es
in layout(location = 0) highp vec2 a_position;
void main()
{
    gl_Position = vec4(a_position, 0.0, 1.0);
})";

    constexpr char kFS1[] = R"(#version 310 es
uniform layout(location = 0) highp ivec2 u_expectedSize;
out layout(location = 3) mediump vec4 f_color;
void main()
{
    if (ivec2(gl_FragCoord.xy) != u_expectedSize) discard;
    f_color = vec4(1.0, 0.5, 0.25, 1.0);
})";

    constexpr char kVS2[] = R"(#version 310 es
in layout(location = 0) highp vec2 a_position;
void main()
{
    gl_Position = vec4(a_position, 0.0, 1.0);
})";

    constexpr char kFS2[] = R"(#version 310 es
uniform layout(location = 0) highp ivec2 u_expectedSize;
out layout(location = 2) mediump vec4 f_color;
void main()
{
    if (ivec2(gl_FragCoord.xy) != u_expectedSize) discard;
    f_color = vec4(1.0, 0.5, 0.25, 1.0);
})";

    ANGLE_GL_PROGRAM(program1, kVS1, kFS1);
    ANGLE_GL_PROGRAM(program2, kVS2, kFS2);

    glUseProgram(program1);

    GLFramebuffer mFramebuffer;
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mFramebuffer);
    GLuint defaultWidth  = 1;
    GLuint defaultHeight = 1;

    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_WIDTH, defaultWidth);
    glFramebufferParameteri(GL_FRAMEBUFFER, GL_FRAMEBUFFER_DEFAULT_HEIGHT, defaultHeight);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    const float data[] = {
        1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, -1.0f, -1.0f,
    };

    GLuint vertexArray  = 0;
    GLuint vertexBuffer = 0;
    GLuint query        = 0;
    GLuint passedCount  = 0;

    glGenQueries(1, &query);
    glGenVertexArrays(1, &vertexArray);
    glBindVertexArray(vertexArray);

    glGenBuffers(1, &vertexBuffer);
    glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW);

    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 2, GL_FLOAT, false, 0, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    validateSamplePass(query, passedCount, defaultWidth, defaultHeight);

    glUseProgram(program2);
    validateSamplePass(query, passedCount, defaultWidth, defaultHeight);

    glUseProgram(program1);
    // If fbo has attachments, the rendering size should be the same as its attachment.
    GLTexture mTexture;
    GLuint width  = 2;
    GLuint height = 2;
    glBindTexture(GL_TEXTURE_2D, mTexture.get());
    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, width, height);

    const GLenum bufs[] = {GL_NONE, GL_NONE, GL_NONE, GL_COLOR_ATTACHMENT3};

    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT3, GL_TEXTURE_2D, mTexture.get(),
                           0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
    glDrawBuffers(4, bufs);

    validateSamplePass(query, passedCount, width, height);

    // If fbo's attachment has been removed, the rendering size should be the same as framebuffer
    // default size.
    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT3, 0, 0, 0);
    EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));

    validateSamplePass(query, passedCount, defaultWidth, defaultHeight);

    glDisableVertexAttribArray(0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindVertexArray(0);
    glDeleteBuffers(1, &vertexBuffer);
    glDeleteVertexArrays(1, &vertexArray);

    ASSERT_GL_NO_ERROR();
}

class AddMockTextureNoRenderTargetTest : public ANGLETest
{
  public:
    AddMockTextureNoRenderTargetTest()
    {
        setWindowWidth(512);
        setWindowHeight(512);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
    }

    void overrideWorkaroundsD3D(FeaturesD3D *features) override
    {
        features->overrideFeatures({"add_mock_texture_no_render_target"}, true);
    }
};

// Test to verify workaround succeeds when no program outputs exist http://anglebug.com/2283
TEST_P(AddMockTextureNoRenderTargetTest, NoProgramOutputWorkaround)
{
    constexpr char kVS[] = "void main() {}";
    constexpr char kFS[] = "void main() {}";

    ANGLE_GL_PROGRAM(drawProgram, kVS, kFS);

    glUseProgram(drawProgram);

    glDrawArrays(GL_TRIANGLES, 0, 6);

    ASSERT_GL_NO_ERROR();
}

// Covers a bug in ANGLE's Vulkan back-end framebuffer cache which ignored depth/stencil after
// calls to DrawBuffers.
TEST_P(FramebufferTest_ES3, AttachmentStateChange)
{
    constexpr GLuint kSize = 2;

    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());

    GLTexture colorTexture;
    glBindTexture(GL_TEXTURE_2D, colorTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorTexture, 0);

    ASSERT_GL_NO_ERROR();
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // First draw without a depth buffer.
    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f);

    GLRenderbuffer depthBuffer;
    glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, kSize, kSize);

    // Bind just a renderbuffer and draw.
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);

    ASSERT_GL_NO_ERROR();
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    glDrawBuffers(0, nullptr);
    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f);

    // Re-enable color buffer and draw one final time. This previously triggered a crash.
    GLenum drawBuffs = {GL_COLOR_ATTACHMENT0};
    glDrawBuffers(1, &drawBuffs);

    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
}

// Tests that we can support a feedback loop between a depth textures and the depth buffer.
// The test emulates the read-only feedback loop in Manhattan.
TEST_P(FramebufferTest_ES3, ReadOnlyDepthFeedbackLoopSupported)
{
    // Feedback loops are only supported on Vulkan.
    // TODO(jmadill): Make GL extension. http://anglebug.com/4969
    ANGLE_SKIP_TEST_IF(!IsVulkan());

    constexpr GLuint kSize = 2;
    glViewport(0, 0, kSize, kSize);

    constexpr char kFS[] = R"(precision mediump float;
varying vec2 v_texCoord;
uniform sampler2D depth;
void main()
{
    if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)
    {
        gl_FragColor = vec4(0, 1, 0, 1);
    }
    else
    {
        gl_FragColor = vec4(1, 0, 0, 1);
    }
})";

    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Texture2D(), kFS);

    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);

    GLTexture colorTexture;
    glBindTexture(GL_TEXTURE_2D, colorTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kSize, kSize, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorTexture, 0);

    GLTexture depthTexture;
    glBindTexture(GL_TEXTURE_2D, depthTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, kSize, kSize, 0, GL_DEPTH_COMPONENT,
                 GL_UNSIGNED_INT, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthTexture, 0);

    ASSERT_GL_NO_ERROR();
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Clear depth to 0.5.
    glClearDepthf(0.5f);
    glClear(GL_DEPTH_BUFFER_BIT);

    // Disable depth. Although this does not remove the feedback loop as defined by the
    // spec it mimics what gfxbench does in its rendering tests.
    glDepthMask(false);
    glDisable(GL_DEPTH_TEST);

    // Verify we can sample the depth texture and get 0.5.
    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5);

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

// Tests corner cases with read-only depth-stencil feedback loops.
TEST_P(FramebufferTest_ES3, ReadOnlyDepthFeedbackLoopStateChanges)
{
    // Feedback loops are only supported on Vulkan.
    // TODO(jmadill): Make GL extension. http://anglebug.com/4969
    ANGLE_SKIP_TEST_IF(!IsVulkan());

    constexpr GLuint kSize = 2;
    glViewport(0, 0, kSize, kSize);

    constexpr char kFS[] = R"(precision mediump float;
varying vec2 v_texCoord;
uniform sampler2D depth;
void main()
{
    if (abs(texture2D(depth, v_texCoord).x - 0.5) < 0.1)
    {
        gl_FragColor = vec4(0, 1, 0, 1);
    }
    else
    {
        gl_FragColor = vec4(1, 0, 0, 1);
    }
})";

    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Texture2D(), kFS);
    glUseProgram(program);

    setupQuadVertexBuffer(0.5f, 1.0f);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
    glEnableVertexAttribArray(0);

    GLFramebuffer framebuffer1;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer1);

    GLTexture colorTexture;
    glBindTexture(GL_TEXTURE_2D, colorTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kSize, kSize, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorTexture, 0);

    GLTexture depthTexture;
    glBindTexture(GL_TEXTURE_2D, depthTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, kSize, kSize, 0, GL_DEPTH_COMPONENT,
                 GL_UNSIGNED_INT, nullptr);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    GLFramebuffer framebuffer2;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer2);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    ASSERT_GL_NO_ERROR();

    // Clear depth to 0.5.
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer1);
    glClearDepthf(0.5f);
    glClear(GL_DEPTH_BUFFER_BIT);
    glFlush();

    // Disable depth. Although this does not remove the feedback loop as defined by the
    // spec it mimics what gfxbench does in its rendering tests.
    glDepthMask(false);
    glDisable(GL_DEPTH_TEST);

    // Draw with loop.
    glDrawArrays(GL_TRIANGLES, 0, 6);
    ASSERT_GL_NO_ERROR();

    // Draw with no loop and second FBO. Starts RP in writable mode.
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer2);
    glBindTexture(GL_TEXTURE_2D, 0);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    ASSERT_GL_NO_ERROR();

    // Draw with loop, restarts RP.
    glBindTexture(GL_TEXTURE_2D, depthTexture);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    ASSERT_GL_NO_ERROR();
}

// Covers a bug in ANGLE's Vulkan back-end. Our VkFramebuffer cache would in some cases forget to
// check the draw states when computing a cache key.
TEST_P(FramebufferTest_ES3, DisabledAttachmentRedefinition)
{
    constexpr GLuint kSize = 2;

    // Make a Framebuffer with two attachments with one enabled and one disabled.
    GLTexture texA, texB;
    glBindTexture(GL_TEXTURE_2D, texA);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
    glBindTexture(GL_TEXTURE_2D, texB);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texA, 0);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, texB, 0);

    // Mask out the second texture.
    constexpr GLenum kOneDrawBuf = GL_COLOR_ATTACHMENT0;
    glDrawBuffers(1, &kOneDrawBuf);

    ASSERT_GL_NO_ERROR();
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // Set up a very simple shader.
    ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
    glViewport(0, 0, kSize, kSize);

    // Draw
    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // Update the masked out attachment and draw again.
    std::vector<GLColor> redPixels(kSize * kSize, GLColor::red);
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, kSize, kSize, GL_RGBA, GL_UNSIGNED_BYTE,
                    redPixels.data());

    // Draw
    drawQuad(program, essl1_shaders::PositionAttrib(), 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    glReadBuffer(GL_COLOR_ATTACHMENT1);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
}

class FramebufferTest : public ANGLETest
{};

template <typename T>
void FillTexture2D(GLuint texture,
                   GLsizei width,
                   GLsizei height,
                   const T &onePixelData,
                   GLint level,
                   GLint internalFormat,
                   GLenum format,
                   GLenum type)
{
    std::vector<T> allPixelsData(width * height, onePixelData);

    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, level, internalFormat, width, height, 0, format, type,
                 allPixelsData.data());
    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);
}

// Multi-context uses of textures should not cause rendering feedback loops.
TEST_P(FramebufferTest, MultiContextNoRenderingFeedbackLoops)
{
    constexpr char kTextureVS[] =
        R"(attribute vec4 a_position;
varying vec2 v_texCoord;
void main() {
    gl_Position = a_position;
    v_texCoord = (a_position.xy * 0.5) + 0.5;
})";

    constexpr char kTextureFS[] =
        R"(precision mediump float;
varying vec2 v_texCoord;
uniform sampler2D u_texture;
void main() {
    gl_FragColor = texture2D(u_texture, v_texCoord).rgba;
})";

    ANGLE_GL_PROGRAM(textureProgram, kTextureVS, kTextureFS);

    glUseProgram(textureProgram.get());
    GLint uniformLoc = glGetUniformLocation(textureProgram.get(), "u_texture");
    ASSERT_NE(-1, uniformLoc);
    glUniform1i(uniformLoc, 0);

    GLTexture texture;
    FillTexture2D(texture.get(), 1, 1, GLColor::red, 0, GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE);
    glBindTexture(GL_TEXTURE_2D, texture.get());
    // Note that _texture_ is still bound to GL_TEXTURE_2D in this context at this point.

    EGLWindow *window          = getEGLWindow();
    EGLDisplay display         = window->getDisplay();
    EGLConfig config           = window->getConfig();
    EGLSurface surface         = window->getSurface();
    EGLint contextAttributes[] = {
        EGL_CONTEXT_MAJOR_VERSION_KHR,
        GetParam().majorVersion,
        EGL_CONTEXT_MINOR_VERSION_KHR,
        GetParam().minorVersion,
        EGL_NONE,
    };
    EGLContext context1 = eglGetCurrentContext();
    // Create context2, sharing resources with context1.
    EGLContext context2 = eglCreateContext(display, config, context1, contextAttributes);
    ASSERT_NE(context2, EGL_NO_CONTEXT);
    eglMakeCurrent(display, surface, surface, context2);

    constexpr char kVS[] =
        R"(attribute vec4 a_position;
void main() {
    gl_Position = a_position;
})";

    constexpr char kFS[] =
        R"(precision mediump float;
void main() {
    gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
})";

    ANGLE_GL_PROGRAM(program, kVS, kFS);
    glUseProgram(program.get());

    ASSERT_GL_NO_ERROR();

    // Render to the texture in context2.
    GLFramebuffer framebuffer;
    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer.get());
    // Texture is still a valid name in context2.
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture.get(), 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
    // There is no rendering feedback loop at this point.

    glDisable(GL_BLEND);
    glDisable(GL_DEPTH_TEST);
    ASSERT_GL_NO_ERROR();

    // If draw is no-op'ed, texture will not be filled appropriately.
    drawQuad(program.get(), "a_position", 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    // Make context1 current again.
    eglMakeCurrent(display, surface, surface, context1);

    // Render texture to screen.
    drawQuad(textureProgram.get(), "a_position", 0.5f, 1.0f, true);
    ASSERT_GL_NO_ERROR();
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);

    eglDestroyContext(display, context2);
}

// Ensure cube-incomplete attachments cause incomplete Framebuffers.
TEST_P(FramebufferTest, IncompleteCubeMap)
{
    constexpr GLuint kSize = 2;

    GLTexture srcTex;
    glBindTexture(GL_TEXTURE_CUBE_MAP, srcTex);
    glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, nullptr);

    GLFramebuffer fbo;
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X,
                           srcTex, 0);

    ASSERT_GL_NO_ERROR();
    ASSERT_GLENUM_EQ(glCheckFramebufferStatus(GL_FRAMEBUFFER),
                     GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT);
}

// Test FBOs with different sizes are drawn correctly
TEST_P(FramebufferTest, BindAndDrawDifferentSizedFBOs)
{
    // 1. Create FBO 1 with dimensions 16x16
    // 2. Draw red into FBO 1 (note, FramebufferVk::syncState is called)
    // 3. Create FBO 2 with dimensions 8x8
    // 4. Draw green into FBO 2 (note, FramebufferVk::syncState is called)
    // 5. Bind FBO 1 (note, it's not dirty)
    // 6. Draw blue into FBO 1
    // 7. Verify FBO 1 is entirely blue

    GLFramebuffer smallFbo;
    GLFramebuffer largeFbo;
    GLTexture smallTexture;
    GLTexture largeTexture;
    constexpr GLsizei kLargeWidth  = 16;
    constexpr GLsizei kLargeHeight = 16;
    constexpr GLsizei kSmallWidth  = 8;
    constexpr GLsizei kSmallHeight = 8;

    ANGLE_GL_PROGRAM(redProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Red());
    ANGLE_GL_PROGRAM(greenProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Green());
    ANGLE_GL_PROGRAM(blueProgram, essl1_shaders::vs::Simple(), essl1_shaders::fs::Blue());

    // 1. Create FBO 1 with dimensions 16x16
    glBindFramebuffer(GL_FRAMEBUFFER, largeFbo);
    glBindTexture(GL_TEXTURE_2D, largeTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kLargeWidth, kLargeHeight, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, largeTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // 2. Draw red into FBO 1 (note, FramebufferVk::syncState is called)
    glUseProgram(redProgram);
    drawQuad(redProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();

    // 3. Create FBO 2 with dimensions 8x8
    glBindFramebuffer(GL_FRAMEBUFFER, smallFbo);
    glBindTexture(GL_TEXTURE_2D, smallTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSmallWidth, kSmallHeight, 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);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, smallTexture, 0);
    ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);

    // 4. Draw green into FBO 2 (note, FramebufferVk::syncState is called)
    glUseProgram(greenProgram);
    drawQuad(greenProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();

    // 5. Bind FBO 1 (note, it's not dirty)
    glBindFramebuffer(GL_FRAMEBUFFER, largeFbo);

    // 6. Draw blue into FBO 1
    glUseProgram(blueProgram);
    drawQuad(blueProgram.get(), std::string(essl1_shaders::PositionAttrib()), 0.0f);
    ASSERT_GL_NO_ERROR();

    // 7. Verify FBO 1 is entirely blue
    EXPECT_PIXEL_RECT_EQ(0, 0, kLargeWidth, kLargeHeight, GLColor::blue);
}

ANGLE_INSTANTIATE_TEST_ES2(AddMockTextureNoRenderTargetTest);
ANGLE_INSTANTIATE_TEST_ES2(FramebufferTest);
ANGLE_INSTANTIATE_TEST_ES2_AND_ES3(FramebufferFormatsTest);
ANGLE_INSTANTIATE_TEST_ES3(FramebufferTest_ES3);
ANGLE_INSTANTIATE_TEST_ES31(FramebufferTest_ES31);
kc3-lang/angle/src/tests/gl_tests/FramebufferTest.cpp

Commit

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