VertexAttributeTest.cpp

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Author : Jamie Madill
Date : 2017-08-21 10:52:40
Hash : 401345e4
Message : D3D11: Move more state into StateManager11. This moves the input layout cache and vertex and index data managers and related info into the state manager. This makes it easier to manage the state application with regards to dirty bits. Also updates the dirty current value handling in StateManager11. BUG=angleproject:1156 BUG=angleproject:2052 Change-Id: I8de968a1f8416363aa1c49d9e9da129942d21275 Reviewed-on: https://chromium-review.googlesource.com/616783 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>
src/tests/gl_tests/VertexAttributeTest.cpp
//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

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

using namespace angle;

namespace
{

GLsizei TypeStride(GLenum attribType)
{
    switch (attribType)
    {
        case GL_UNSIGNED_BYTE:
        case GL_BYTE:
            return 1;
        case GL_UNSIGNED_SHORT:
        case GL_SHORT:
            return 2;
        case GL_UNSIGNED_INT:
        case GL_INT:
        case GL_FLOAT:
            return 4;
        default:
            EXPECT_TRUE(false);
            return 0;
    }
}

template <typename T>
GLfloat Normalize(T value)
{
    static_assert(std::is_integral<T>::value, "Integer required.");
    if (std::is_signed<T>::value)
    {
        typedef typename std::make_unsigned<T>::type unsigned_type;
        return (2.0f * static_cast<GLfloat>(value) + 1.0f) /
               static_cast<GLfloat>(std::numeric_limits<unsigned_type>::max());
    }
    else
    {
        return static_cast<GLfloat>(value) / static_cast<GLfloat>(std::numeric_limits<T>::max());
    }
}

class VertexAttributeTest : public ANGLETest
{
  protected:
    VertexAttributeTest()
        : mProgram(0), mTestAttrib(-1), mExpectedAttrib(-1), mBuffer(0), mQuadBuffer(0)
    {
        setWindowWidth(128);
        setWindowHeight(128);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
        setConfigDepthBits(24);
    }

    enum class Source
    {
        BUFFER,
        IMMEDIATE,
    };

    struct TestData final : private angle::NonCopyable
    {
        TestData(GLenum typeIn,
                 GLboolean normalizedIn,
                 Source sourceIn,
                 const void *inputDataIn,
                 const GLfloat *expectedDataIn)
            : type(typeIn),
              normalized(normalizedIn),
              bufferOffset(0),
              source(sourceIn),
              inputData(inputDataIn),
              expectedData(expectedDataIn)
        {
        }

        GLenum type;
        GLboolean normalized;
        size_t bufferOffset;
        Source source;

        const void *inputData;
        const GLfloat *expectedData;
    };

    void setupTest(const TestData &test, GLint typeSize)
    {
        if (mProgram == 0)
        {
            initBasicProgram();
        }

        if (test.source == Source::BUFFER)
        {
            GLsizei dataSize = kVertexCount * TypeStride(test.type);
            glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
            glBufferData(GL_ARRAY_BUFFER, dataSize, test.inputData, GL_STATIC_DRAW);
            glVertexAttribPointer(mTestAttrib, typeSize, test.type, test.normalized, 0,
                                  reinterpret_cast<void *>(test.bufferOffset));
            glBindBuffer(GL_ARRAY_BUFFER, 0);
        }
        else
        {
            ASSERT_EQ(Source::IMMEDIATE, test.source);
            glBindBuffer(GL_ARRAY_BUFFER, 0);
            glVertexAttribPointer(mTestAttrib, typeSize, test.type, test.normalized, 0,
                                  test.inputData);
        }

        glVertexAttribPointer(mExpectedAttrib, typeSize, GL_FLOAT, GL_FALSE, 0, test.expectedData);

        glEnableVertexAttribArray(mTestAttrib);
        glEnableVertexAttribArray(mExpectedAttrib);
    }

    void checkPixels()
    {
        GLint viewportSize[4];
        glGetIntegerv(GL_VIEWPORT, viewportSize);

        GLint midPixelX = (viewportSize[0] + viewportSize[2]) / 2;
        GLint midPixelY = (viewportSize[1] + viewportSize[3]) / 2;

        // We need to offset our checks from triangle edges to ensure we don't fall on a single tri
        // Avoid making assumptions of drawQuad with four checks to check the four possible tri
        // regions
        EXPECT_PIXEL_EQ((midPixelX + viewportSize[0]) / 2, midPixelY, 255, 255, 255, 255);
        EXPECT_PIXEL_EQ((midPixelX + viewportSize[2]) / 2, midPixelY, 255, 255, 255, 255);
        EXPECT_PIXEL_EQ(midPixelX, (midPixelY + viewportSize[1]) / 2, 255, 255, 255, 255);
        EXPECT_PIXEL_EQ(midPixelX, (midPixelY + viewportSize[3]) / 2, 255, 255, 255, 255);
    }

    void checkPixelsUnEqual()
    {
        GLint viewportSize[4];
        glGetIntegerv(GL_VIEWPORT, viewportSize);

        GLint midPixelX = (viewportSize[0] + viewportSize[2]) / 2;
        GLint midPixelY = (viewportSize[1] + viewportSize[3]) / 2;

        // We need to offset our checks from triangle edges to ensure we don't fall on a single tri
        // Avoid making assumptions of drawQuad with four checks to check the four possible tri
        // regions
        EXPECT_PIXEL_NE((midPixelX + viewportSize[0]) / 2, midPixelY, 255, 255, 255, 255);
        EXPECT_PIXEL_NE((midPixelX + viewportSize[2]) / 2, midPixelY, 255, 255, 255, 255);
        EXPECT_PIXEL_NE(midPixelX, (midPixelY + viewportSize[1]) / 2, 255, 255, 255, 255);
        EXPECT_PIXEL_NE(midPixelX, (midPixelY + viewportSize[3]) / 2, 255, 255, 255, 255);
    }

    void runTest(const TestData &test) { runTest(test, true); }

    void runTest(const TestData &test, bool checkPixelEqual)
    {
        // TODO(geofflang): Figure out why this is broken on AMD OpenGL
        if (IsAMD() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
        {
            std::cout << "Test skipped on AMD OpenGL." << std::endl;
            return;
        }

        for (GLint i = 0; i < 4; i++)
        {
            GLint typeSize = i + 1;
            setupTest(test, typeSize);

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

            glDisableVertexAttribArray(mTestAttrib);
            glDisableVertexAttribArray(mExpectedAttrib);

            if (checkPixelEqual)
            {
                checkPixels();
            }
            else
            {
                checkPixelsUnEqual();
            }
        }
    }

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

        glClearColor(0, 0, 0, 0);
        glClearDepthf(0.0);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glDisable(GL_DEPTH_TEST);

        glGenBuffers(1, &mBuffer);
    }

    void TearDown() override
    {
        glDeleteProgram(mProgram);
        glDeleteBuffers(1, &mBuffer);
        glDeleteBuffers(1, &mQuadBuffer);

        ANGLETest::TearDown();
    }

    GLuint compileMultiAttribProgram(GLint attribCount)
    {
        std::stringstream shaderStream;

        shaderStream << "attribute mediump vec4 position;" << std::endl;
        for (GLint attribIndex = 0; attribIndex < attribCount; ++attribIndex)
        {
            shaderStream << "attribute float a" << attribIndex << ";" << std::endl;
        }
        shaderStream << "varying mediump float color;" << std::endl
                     << "void main() {" << std::endl
                     << "  gl_Position = position;" << std::endl
                     << "  color = 0.0;" << std::endl;
        for (GLint attribIndex = 0; attribIndex < attribCount; ++attribIndex)
        {
            shaderStream << "  color += a" << attribIndex << ";" << std::endl;
        }
        shaderStream << "}" << std::endl;

        const std::string testFragmentShaderSource =
            "varying mediump float color;\n"
            "void main(void)\n"
            "{\n"
            "    gl_FragColor = vec4(color, 0.0, 0.0, 1.0);\n"
            "}\n";

        return CompileProgram(shaderStream.str(), testFragmentShaderSource);
    }

    void setupMultiAttribs(GLuint program, GLint attribCount, GLfloat value)
    {
        glUseProgram(program);
        for (GLint attribIndex = 0; attribIndex < attribCount; ++attribIndex)
        {
            std::stringstream attribStream;
            attribStream << "a" << attribIndex;
            GLint location = glGetAttribLocation(program, attribStream.str().c_str());
            ASSERT_NE(-1, location);
            glVertexAttrib1f(location, value);
            glDisableVertexAttribArray(location);
        }
    }

    void initBasicProgram()
    {
        const std::string testVertexShaderSource =
            "attribute mediump vec4 position;\n"
            "attribute mediump vec4 test;\n"
            "attribute mediump vec4 expected;\n"
            "varying mediump vec4 color;\n"
            "void main(void)\n"
            "{\n"
            "    gl_Position = position;\n"
            "    vec4 threshold = max(abs(expected) * 0.01, 1.0 / 64.0);\n"
            "    color = vec4(lessThanEqual(abs(test - expected), threshold));\n"
            "}\n";

        const std::string testFragmentShaderSource =
            "varying mediump vec4 color;\n"
            "void main(void)\n"
            "{\n"
            "    gl_FragColor = color;\n"
            "}\n";

        mProgram = CompileProgram(testVertexShaderSource, testFragmentShaderSource);
        ASSERT_NE(0u, mProgram);

        mTestAttrib = glGetAttribLocation(mProgram, "test");
        ASSERT_NE(-1, mTestAttrib);
        mExpectedAttrib = glGetAttribLocation(mProgram, "expected");
        ASSERT_NE(-1, mExpectedAttrib);

        glUseProgram(mProgram);
    }

    static constexpr size_t kVertexCount = 24;

    static void InitTestData(std::array<GLfloat, kVertexCount> &inputData,
                             std::array<GLfloat, kVertexCount> &expectedData)
    {
        for (size_t count = 0; count < kVertexCount; ++count)
        {
            inputData[count]    = static_cast<GLfloat>(count);
            expectedData[count] = inputData[count];
        }
    }

    GLuint mProgram;
    GLint mTestAttrib;
    GLint mExpectedAttrib;
    GLuint mBuffer;
    GLuint mQuadBuffer;
};

TEST_P(VertexAttributeTest, UnsignedByteUnnormalized)
{
    std::array<GLubyte, kVertexCount> inputData = {
        {0, 1, 2, 3, 4, 5, 6, 7, 125, 126, 127, 128, 129, 250, 251, 252, 253, 254, 255}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = inputData[i];
    }

    TestData data(GL_UNSIGNED_BYTE, GL_FALSE, Source::IMMEDIATE, inputData.data(),
                  expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTest, UnsignedByteNormalized)
{
    std::array<GLubyte, kVertexCount> inputData = {
        {0, 1, 2, 3, 4, 5, 6, 7, 125, 126, 127, 128, 129, 250, 251, 252, 253, 254, 255}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = Normalize(inputData[i]);
    }

    TestData data(GL_UNSIGNED_BYTE, GL_TRUE, Source::IMMEDIATE, inputData.data(),
                  expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTest, ByteUnnormalized)
{
    std::array<GLbyte, kVertexCount> inputData = {
        {0, 1, 2, 3, 4, -1, -2, -3, -4, 125, 126, 127, -128, -127, -126}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = inputData[i];
    }

    TestData data(GL_BYTE, GL_FALSE, Source::IMMEDIATE, inputData.data(), expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTest, ByteNormalized)
{
    std::array<GLbyte, kVertexCount> inputData = {
        {0, 1, 2, 3, 4, -1, -2, -3, -4, 125, 126, 127, -128, -127, -126}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = Normalize(inputData[i]);
    }

    TestData data(GL_BYTE, GL_TRUE, Source::IMMEDIATE, inputData.data(), expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTest, UnsignedShortUnnormalized)
{
    std::array<GLushort, kVertexCount> inputData = {
        {0, 1, 2, 3, 254, 255, 256, 32766, 32767, 32768, 65533, 65534, 65535}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = inputData[i];
    }

    TestData data(GL_UNSIGNED_SHORT, GL_FALSE, Source::IMMEDIATE, inputData.data(),
                  expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTest, UnsignedShortNormalized)
{
    std::array<GLushort, kVertexCount> inputData = {
        {0, 1, 2, 3, 254, 255, 256, 32766, 32767, 32768, 65533, 65534, 65535}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = Normalize(inputData[i]);
    }

    TestData data(GL_UNSIGNED_SHORT, GL_TRUE, Source::IMMEDIATE, inputData.data(),
                  expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTest, ShortUnnormalized)
{
    std::array<GLshort, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, 32766, 32767, -32768, -32767, -32766}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = inputData[i];
    }

    TestData data(GL_SHORT, GL_FALSE, Source::IMMEDIATE, inputData.data(), expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTest, ShortNormalized)
{
    std::array<GLshort, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, 32766, 32767, -32768, -32767, -32766}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = Normalize(inputData[i]);
    }

    TestData data(GL_SHORT, GL_TRUE, Source::IMMEDIATE, inputData.data(), expectedData.data());
    runTest(data);
}

// Verify that using the same client memory pointer in different format won't mess up the draw.
TEST_P(VertexAttributeTest, UsingDifferentFormatAndSameClientMemoryPointer)
{
    std::array<GLshort, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, 32766, 32767, -32768, -32767, -32766}};

    std::array<GLfloat, kVertexCount> unnormalizedExpectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        unnormalizedExpectedData[i] = inputData[i];
    }

    TestData unnormalizedData(GL_SHORT, GL_FALSE, Source::IMMEDIATE, inputData.data(),
                              unnormalizedExpectedData.data());
    runTest(unnormalizedData);

    std::array<GLfloat, kVertexCount> normalizedExpectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        inputData[i]              = -inputData[i];
        normalizedExpectedData[i] = Normalize(inputData[i]);
    }

    TestData normalizedData(GL_SHORT, GL_TRUE, Source::IMMEDIATE, inputData.data(),
                            normalizedExpectedData.data());
    runTest(normalizedData);
}

// Verify that vertex format is updated correctly when the client memory pointer is same.
TEST_P(VertexAttributeTest, NegativeUsingDifferentFormatAndSameClientMemoryPointer)
{
    std::array<GLshort, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, 32766, 32767, -32768, -32767, -32766}};

    std::array<GLfloat, kVertexCount> unnormalizedExpectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        unnormalizedExpectedData[i] = inputData[i];
    }

    // Use unnormalized short as the format of the data in client memory pointer in the first draw.
    TestData unnormalizedData(GL_SHORT, GL_FALSE, Source::IMMEDIATE, inputData.data(),
                              unnormalizedExpectedData.data());
    runTest(unnormalizedData);

    // Use normalized short as the format of the data in client memory pointer in the second draw,
    // but mExpectedAttrib is the same as the first draw.
    TestData normalizedData(GL_SHORT, GL_TRUE, Source::IMMEDIATE, inputData.data(),
                            unnormalizedExpectedData.data());
    runTest(normalizedData, false);
}

// Verify that using different vertex format and same buffer won't mess up the draw.
TEST_P(VertexAttributeTest, UsingDifferentFormatAndSameBuffer)
{
    std::array<GLshort, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, 32766, 32767, -32768, -32767, -32766}};

    std::array<GLfloat, kVertexCount> unnormalizedExpectedData;
    std::array<GLfloat, kVertexCount> normalizedExpectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        unnormalizedExpectedData[i] = inputData[i];
        normalizedExpectedData[i]   = Normalize(inputData[i]);
    }

    // Use unnormalized short as the format of the data in mBuffer in the first draw.
    TestData unnormalizedData(GL_SHORT, GL_FALSE, Source::BUFFER, inputData.data(),
                              unnormalizedExpectedData.data());
    runTest(unnormalizedData);

    // Use normalized short as the format of the data in mBuffer in the second draw.
    TestData normalizedData(GL_SHORT, GL_TRUE, Source::BUFFER, inputData.data(),
                            normalizedExpectedData.data());
    runTest(normalizedData);
}

// Verify that vertex format is updated correctly when the buffer is same.
TEST_P(VertexAttributeTest, NegativeUsingDifferentFormatAndSameBuffer)
{
    std::array<GLshort, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, 32766, 32767, -32768, -32767, -32766}};

    std::array<GLfloat, kVertexCount> unnormalizedExpectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        unnormalizedExpectedData[i] = inputData[i];
    }

    // Use unnormalized short as the format of the data in mBuffer in the first draw.
    TestData unnormalizedData(GL_SHORT, GL_FALSE, Source::BUFFER, inputData.data(),
                              unnormalizedExpectedData.data());
    runTest(unnormalizedData);

    // Use normalized short as the format of the data in mBuffer in the second draw, but
    // mExpectedAttrib is the same as the first draw.
    TestData normalizedData(GL_SHORT, GL_TRUE, Source::BUFFER, inputData.data(),
                            unnormalizedExpectedData.data());

    // The check should fail because the test data is changed while the expected data is the same.
    runTest(normalizedData, false);
}

// Verify that mixed using buffer and client memory pointer won't mess up the draw.
TEST_P(VertexAttributeTest, MixedUsingBufferAndClientMemoryPointer)
{
    std::array<GLshort, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, 32766, 32767, -32768, -32767, -32766}};

    std::array<GLfloat, kVertexCount> unnormalizedExpectedData;
    std::array<GLfloat, kVertexCount> normalizedExpectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        unnormalizedExpectedData[i] = inputData[i];
        normalizedExpectedData[i]   = Normalize(inputData[i]);
    }

    TestData unnormalizedData(GL_SHORT, GL_FALSE, Source::IMMEDIATE, inputData.data(),
                              unnormalizedExpectedData.data());
    runTest(unnormalizedData);

    TestData unnormalizedBufferData(GL_SHORT, GL_FALSE, Source::BUFFER, inputData.data(),
                                    unnormalizedExpectedData.data());
    runTest(unnormalizedBufferData);

    TestData normalizedData(GL_SHORT, GL_TRUE, Source::IMMEDIATE, inputData.data(),
                            normalizedExpectedData.data());
    runTest(normalizedData);
}

class VertexAttributeTestES3 : public VertexAttributeTest
{
  protected:
    VertexAttributeTestES3() {}
};

TEST_P(VertexAttributeTestES3, IntUnnormalized)
{
    GLint lo = std::numeric_limits<GLint>::min();
    GLint hi = std::numeric_limits<GLint>::max();
    std::array<GLint, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, -1, hi, hi - 1, lo, lo + 1}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = static_cast<GLfloat>(inputData[i]);
    }

    TestData data(GL_INT, GL_FALSE, Source::BUFFER, inputData.data(), expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTestES3, IntNormalized)
{
    GLint lo = std::numeric_limits<GLint>::min();
    GLint hi = std::numeric_limits<GLint>::max();
    std::array<GLint, kVertexCount> inputData = {
        {0, 1, 2, 3, -1, -2, -3, -4, -1, hi, hi - 1, lo, lo + 1}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = Normalize(inputData[i]);
    }

    TestData data(GL_INT, GL_TRUE, Source::BUFFER, inputData.data(), expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTestES3, UnsignedIntUnnormalized)
{
    GLuint mid = std::numeric_limits<GLuint>::max() >> 1;
    GLuint hi  = std::numeric_limits<GLuint>::max();
    std::array<GLuint, kVertexCount> inputData = {
        {0, 1, 2, 3, 254, 255, 256, mid - 1, mid, mid + 1, hi - 2, hi - 1, hi}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = static_cast<GLfloat>(inputData[i]);
    }

    TestData data(GL_UNSIGNED_INT, GL_FALSE, Source::BUFFER, inputData.data(), expectedData.data());
    runTest(data);
}

TEST_P(VertexAttributeTestES3, UnsignedIntNormalized)
{
    GLuint mid = std::numeric_limits<GLuint>::max() >> 1;
    GLuint hi  = std::numeric_limits<GLuint>::max();
    std::array<GLuint, kVertexCount> inputData = {
        {0, 1, 2, 3, 254, 255, 256, mid - 1, mid, mid + 1, hi - 2, hi - 1, hi}};
    std::array<GLfloat, kVertexCount> expectedData;
    for (size_t i = 0; i < kVertexCount; i++)
    {
        expectedData[i] = Normalize(inputData[i]);
    }

    TestData data(GL_UNSIGNED_INT, GL_TRUE, Source::BUFFER, inputData.data(), expectedData.data());
    runTest(data);
}

// Validate that we can support GL_MAX_ATTRIBS attribs
TEST_P(VertexAttributeTest, MaxAttribs)
{
    // TODO(jmadill): Figure out why we get this error on AMD/OpenGL and Intel.
    if ((IsIntel() || IsAMD()) && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel and AMD." << std::endl;
        return;
    }

    GLint maxAttribs;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxAttribs);
    ASSERT_GL_NO_ERROR();

    // Reserve one attrib for position
    GLint drawAttribs = maxAttribs - 1;

    GLuint program = compileMultiAttribProgram(drawAttribs);
    ASSERT_NE(0u, program);

    setupMultiAttribs(program, drawAttribs, 0.5f / static_cast<float>(drawAttribs));
    drawQuad(program, "position", 0.5f);

    EXPECT_GL_NO_ERROR();
    EXPECT_PIXEL_NEAR(0, 0, 128, 0, 0, 255, 1);
}

// Validate that we cannot support GL_MAX_ATTRIBS+1 attribs
TEST_P(VertexAttributeTest, MaxAttribsPlusOne)
{
    // TODO(jmadill): Figure out why we get this error on AMD/ES2/OpenGL
    if (IsAMD() && GetParam() == ES2_OPENGL())
    {
        std::cout << "Test disabled on AMD/ES2/OpenGL" << std::endl;
        return;
    }

    GLint maxAttribs;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxAttribs);
    ASSERT_GL_NO_ERROR();

    // Exceed attrib count by one (counting position)
    GLint drawAttribs = maxAttribs;

    GLuint program = compileMultiAttribProgram(drawAttribs);
    ASSERT_EQ(0u, program);
}

// Simple test for when we use glBindAttribLocation
TEST_P(VertexAttributeTest, SimpleBindAttribLocation)
{
    // TODO(jmadill): Figure out why this fails on Intel.
    if (IsIntel() && GetParam().getRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on Intel." << std::endl;
        return;
    }

    // Re-use the multi-attrib program, binding attribute 0
    GLuint program = compileMultiAttribProgram(1);
    glBindAttribLocation(program, 2, "position");
    glBindAttribLocation(program, 3, "a0");
    glLinkProgram(program);

    // Setup and draw the quad
    setupMultiAttribs(program, 1, 0.5f);
    drawQuad(program, "position", 0.5f);
    EXPECT_GL_NO_ERROR();
    EXPECT_PIXEL_NEAR(0, 0, 128, 0, 0, 255, 1);
}

// Verify that drawing with a large out-of-range offset generates INVALID_OPERATION.
TEST_P(VertexAttributeTest, DrawArraysBufferTooSmall)
{
    std::array<GLfloat, kVertexCount> inputData;
    std::array<GLfloat, kVertexCount> expectedData;
    InitTestData(inputData, expectedData);

    TestData data(GL_FLOAT, GL_FALSE, Source::BUFFER, inputData.data(), expectedData.data());
    data.bufferOffset = kVertexCount * TypeStride(GL_FLOAT);

    setupTest(data, 1);
    drawQuad(mProgram, "position", 0.5f);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

// Verify that index draw with an out-of-range offset generates INVALID_OPERATION.
TEST_P(VertexAttributeTest, DrawElementsBufferTooSmall)
{
    std::array<GLfloat, kVertexCount> inputData;
    std::array<GLfloat, kVertexCount> expectedData;
    InitTestData(inputData, expectedData);

    TestData data(GL_FLOAT, GL_FALSE, Source::BUFFER, inputData.data(), expectedData.data());
    data.bufferOffset = (kVertexCount - 3) * TypeStride(GL_FLOAT);

    setupTest(data, 1);
    drawIndexedQuad(mProgram, "position", 0.5f);
    EXPECT_GL_ERROR(GL_INVALID_OPERATION);
}

// Verify that using a different start vertex doesn't mess up the draw.
TEST_P(VertexAttributeTest, DrawArraysWithBufferOffset)
{
    // TODO(jmadill): Diagnose this failure.
    if (IsD3D11_FL93())
    {
        std::cout << "Test disabled on D3D11 FL 9_3" << std::endl;
        return;
    }

    // TODO(geofflang): Figure out why this is broken on AMD OpenGL
    if (IsAMD() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
    {
        std::cout << "Test skipped on AMD OpenGL." << std::endl;
        return;
    }

    initBasicProgram();
    glUseProgram(mProgram);

    std::array<GLfloat, kVertexCount> inputData;
    std::array<GLfloat, kVertexCount> expectedData;
    InitTestData(inputData, expectedData);

    auto quadVertices        = GetQuadVertices();
    GLsizei quadVerticesSize = static_cast<GLsizei>(quadVertices.size() * sizeof(quadVertices[0]));

    glGenBuffers(1, &mQuadBuffer);
    glBindBuffer(GL_ARRAY_BUFFER, mQuadBuffer);
    glBufferData(GL_ARRAY_BUFFER, quadVerticesSize + sizeof(Vector3), nullptr, GL_STATIC_DRAW);
    glBufferSubData(GL_ARRAY_BUFFER, 0, quadVerticesSize, quadVertices.data());

    GLint positionLocation = glGetAttribLocation(mProgram, "position");
    ASSERT_NE(-1, positionLocation);
    glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
    glEnableVertexAttribArray(positionLocation);

    GLsizei dataSize = kVertexCount * TypeStride(GL_FLOAT);
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glBufferData(GL_ARRAY_BUFFER, dataSize + TypeStride(GL_FLOAT), nullptr, GL_STATIC_DRAW);
    glBufferSubData(GL_ARRAY_BUFFER, 0, dataSize, inputData.data());
    glVertexAttribPointer(mTestAttrib, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
    glEnableVertexAttribArray(mTestAttrib);

    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glVertexAttribPointer(mExpectedAttrib, 1, GL_FLOAT, GL_FALSE, 0, expectedData.data());
    glEnableVertexAttribArray(mExpectedAttrib);

    // Vertex draw with no start vertex offset (second argument is zero).
    glDrawArrays(GL_TRIANGLES, 0, 6);
    checkPixels();

    // Draw offset by one vertex.
    glDrawArrays(GL_TRIANGLES, 1, 6);
    checkPixels();

    EXPECT_GL_NO_ERROR();
}

// Verify that when we pass a client memory pointer to a disabled attribute the draw is still
// correct.
TEST_P(VertexAttributeTest, DrawArraysWithDisabledAttribute)
{
    initBasicProgram();

    std::array<GLfloat, kVertexCount> inputData;
    std::array<GLfloat, kVertexCount> expectedData;
    InitTestData(inputData, expectedData);

    auto quadVertices        = GetQuadVertices();
    GLsizei quadVerticesSize = static_cast<GLsizei>(quadVertices.size() * sizeof(quadVertices[0]));

    glGenBuffers(1, &mQuadBuffer);
    glBindBuffer(GL_ARRAY_BUFFER, mQuadBuffer);
    glBufferData(GL_ARRAY_BUFFER, quadVerticesSize, quadVertices.data(), GL_STATIC_DRAW);

    GLint positionLocation = glGetAttribLocation(mProgram, "position");
    ASSERT_NE(-1, positionLocation);
    glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
    glEnableVertexAttribArray(positionLocation);

    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(inputData), inputData.data(), GL_STATIC_DRAW);
    glVertexAttribPointer(mTestAttrib, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
    glEnableVertexAttribArray(mTestAttrib);

    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glVertexAttribPointer(mExpectedAttrib, 1, GL_FLOAT, GL_FALSE, 0, expectedData.data());
    glEnableVertexAttribArray(mExpectedAttrib);

    // mProgram2 adds an attribute 'disabled' on the basis of mProgram.
    const std::string testVertexShaderSource2 =
        "attribute mediump vec4 position;\n"
        "attribute mediump vec4 test;\n"
        "attribute mediump vec4 expected;\n"
        "attribute mediump vec4 disabled;\n"
        "varying mediump vec4 color;\n"
        "void main(void)\n"
        "{\n"
        "    gl_Position = position;\n"
        "    vec4 threshold = max(abs(expected + disabled) * 0.005, 1.0 / 64.0);\n"
        "    color = vec4(lessThanEqual(abs(test - expected), threshold));\n"
        "}\n";

    const std::string testFragmentShaderSource =
        "varying mediump vec4 color;\n"
        "void main(void)\n"
        "{\n"
        "    gl_FragColor = color;\n"
        "}\n";

    ANGLE_GL_PROGRAM(program, testVertexShaderSource2, testFragmentShaderSource);
    GLuint mProgram2 = program.get();

    ASSERT_EQ(positionLocation, glGetAttribLocation(mProgram2, "position"));
    ASSERT_EQ(mTestAttrib, glGetAttribLocation(mProgram2, "test"));
    ASSERT_EQ(mExpectedAttrib, glGetAttribLocation(mProgram2, "expected"));

    // Pass a client memory pointer to disabledAttribute and disable it.
    GLint disabledAttribute = glGetAttribLocation(mProgram2, "disabled");
    ASSERT_EQ(-1, glGetAttribLocation(mProgram, "disabled"));
    glVertexAttribPointer(disabledAttribute, 1, GL_FLOAT, GL_FALSE, 0, expectedData.data());
    glDisableVertexAttribArray(disabledAttribute);

    glUseProgram(mProgram);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    checkPixels();

    // Now enable disabledAttribute which should be used in mProgram2.
    glEnableVertexAttribArray(disabledAttribute);
    glUseProgram(mProgram2);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    checkPixels();

    EXPECT_GL_NO_ERROR();
}

// Test based on WebGL Test attribs/gl-disabled-vertex-attrib.html
TEST_P(VertexAttributeTest, DisabledAttribArrays)
{
    // Known failure on Retina MBP: http://crbug.com/635081
    ANGLE_SKIP_TEST_IF(IsOSX() && IsNVIDIA());

    const std::string vsSource =
        "attribute vec4 a_position;\n"
        "attribute vec4 a_color;\n"
        "varying vec4 v_color;\n"
        "bool isCorrectColor(vec4 v) {\n"
        "    return v.x == 0.0 && v.y == 0.0 && v.z == 0.0 && v.w == 1.0;\n"
        "}"
        "void main() {\n"
        "    gl_Position = a_position;\n"
        "    v_color = isCorrectColor(a_color) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);\n"
        "}";

    const std::string fsSource =
        "varying mediump vec4 v_color;\n"
        "void main() {\n"
        "    gl_FragColor = v_color;\n"
        "}";

    GLint maxVertexAttribs = 0;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxVertexAttribs);

    for (GLint colorIndex = 0; colorIndex < maxVertexAttribs; ++colorIndex)
    {
        GLuint vs = CompileShader(GL_VERTEX_SHADER, vsSource);
        ASSERT_NE(0u, vs);
        GLuint fs = CompileShader(GL_FRAGMENT_SHADER, fsSource);
        ASSERT_NE(0u, fs);

        GLuint program = glCreateProgram();
        glBindAttribLocation(program, colorIndex, "a_color");

        glAttachShader(program, vs);
        glDeleteShader(vs);

        glAttachShader(program, fs);
        glDeleteShader(fs);

        ASSERT_TRUE(LinkAttachedProgram(program));

        drawQuad(program, "a_position", 0.5f);
        ASSERT_GL_NO_ERROR();

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

        glDeleteProgram(program);
    }
}

class VertexAttributeTestES31 : public VertexAttributeTestES3
{
  protected:
    VertexAttributeTestES31() {}

    void initTest()
    {
        initBasicProgram();
        glUseProgram(mProgram);

        glGenVertexArrays(1, &mVAO);
        glBindVertexArray(mVAO);

        auto quadVertices = GetQuadVertices();
        GLsizeiptr quadVerticesSize =
            static_cast<GLsizeiptr>(quadVertices.size() * sizeof(quadVertices[0]));
        glGenBuffers(1, &mQuadBuffer);
        glBindBuffer(GL_ARRAY_BUFFER, mQuadBuffer);
        glBufferData(GL_ARRAY_BUFFER, quadVerticesSize, quadVertices.data(), GL_STATIC_DRAW);

        GLint positionLocation = glGetAttribLocation(mProgram, "position");
        ASSERT_NE(-1, positionLocation);
        glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
        glEnableVertexAttribArray(positionLocation);

        std::array<GLfloat, kVertexCount> expectedData;
        for (size_t count = 0; count < kVertexCount; ++count)
        {
            expectedData[count] = static_cast<GLfloat>(count);
        }

        const GLsizei kExpectedDataSize = kVertexCount * kFloatStride;
        glGenBuffers(1, &mExpectedBuffer);
        glBindBuffer(GL_ARRAY_BUFFER, mExpectedBuffer);
        glBufferData(GL_ARRAY_BUFFER, kExpectedDataSize, expectedData.data(), GL_STATIC_DRAW);
        glVertexAttribPointer(mExpectedAttrib, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
        glEnableVertexAttribArray(mExpectedAttrib);
    }

    void TearDown() override
    {
        VertexAttributeTestES3::TearDown();

        glDeleteBuffers(1, &mExpectedBuffer);
        glDeleteVertexArrays(1, &mVAO);
    }

    void drawArraysWithStrideAndOffset(GLint stride, GLsizeiptr offset)
    {
        initTest();

        GLint floatStride      = stride ? (stride / kFloatStride) : 1;
        GLsizeiptr floatOffset = offset / kFloatStride;
        size_t floatCount      = static_cast<size_t>(floatOffset) + kVertexCount * floatStride;
        GLsizeiptr inputSize   = static_cast<GLsizeiptr>(floatCount) * kFloatStride;

        std::vector<GLfloat> inputData(floatCount);
        for (size_t count = 0; count < kVertexCount; ++count)
        {
            inputData[floatOffset + count * floatStride] = static_cast<GLfloat>(count);
        }

        // Ensure inputSize, inputStride and inputOffset are multiples of TypeStride(GL_FLOAT).
        GLsizei inputStride    = stride ? floatStride * kFloatStride : 0;
        GLsizeiptr inputOffset = floatOffset * kFloatStride;
        glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
        glBufferData(GL_ARRAY_BUFFER, inputSize, nullptr, GL_STATIC_DRAW);
        glBufferSubData(GL_ARRAY_BUFFER, 0, inputSize, inputData.data());
        glVertexAttribPointer(mTestAttrib, 1, GL_FLOAT, GL_FALSE, inputStride,
                              reinterpret_cast<const void *>(inputOffset));
        glEnableVertexAttribArray(mTestAttrib);

        glDrawArrays(GL_TRIANGLES, 0, 6);
        checkPixels();

        EXPECT_GL_NO_ERROR();
    }

    GLuint mVAO;
    GLuint mExpectedBuffer;

    const GLsizei kFloatStride = TypeStride(GL_FLOAT);

    // Set the maximum value for stride if the stride is too large.
    static constexpr GLint MAX_STRIDE_FOR_TEST = 4095;
};

// Verify that MAX_VERTEX_ATTRIB_STRIDE is no less than the minimum required value (2048) in ES3.1.
TEST_P(VertexAttributeTestES31, MaxVertexAttribStride)
{
    GLint maxStride;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIB_STRIDE, &maxStride);
    ASSERT_GL_NO_ERROR();

    EXPECT_GE(maxStride, 2048);
}

// Verify that GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET is no less than the minimum required value
// (2047) in ES3.1.
TEST_P(VertexAttributeTestES31, MaxVertexAttribRelativeOffset)
{
    GLint maxRelativeOffset;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET, &maxRelativeOffset);
    ASSERT_GL_NO_ERROR();

    EXPECT_GE(maxRelativeOffset, 2047);
}

// Verify using MAX_VERTEX_ATTRIB_STRIDE as stride doesn't mess up the draw.
// Use default value if the value of MAX_VERTEX_ATTRIB_STRIDE is too large for this test.
TEST_P(VertexAttributeTestES31, DrawArraysWithLargeStride)
{
    GLint maxStride;
    glGetIntegerv(GL_MAX_VERTEX_ATTRIB_STRIDE, &maxStride);
    ASSERT_GL_NO_ERROR();

    GLint largeStride = (maxStride < MAX_STRIDE_FOR_TEST) ? maxStride : MAX_STRIDE_FOR_TEST;
    drawArraysWithStrideAndOffset(largeStride, 0);
}

// TODO(jiawei.shao@intel.com): Merge it into VertexAttributeTestES31 when Vertex Attrib
// Binding is supported on D3D11 back-ends.
class VertexAttributeTestES31_OpenGL : public VertexAttributeTestES31
{
  protected:
    VertexAttributeTestES31_OpenGL() {}
};

// Verify that using VertexAttribBinding after VertexAttribPointer won't mess up the draw.
TEST_P(VertexAttributeTestES31_OpenGL, ChangeAttribBindingAfterVertexAttribPointer)
{
    initTest();

    constexpr GLint kInputStride = 2;
    constexpr GLint kFloatOffset = 10;
    std::array<GLfloat, kVertexCount + kFloatOffset> inputData1;
    std::array<GLfloat, kVertexCount * kInputStride> inputData2;
    for (size_t count = 0; count < kVertexCount; ++count)
    {
        inputData1[kFloatOffset + count] = static_cast<GLfloat>(count);
        inputData2[count * kInputStride] = static_cast<GLfloat>(count);
    }

    GLBuffer mBuffer1;
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer1);
    glBufferData(GL_ARRAY_BUFFER, inputData1.size() * kFloatStride, inputData1.data(),
                 GL_STATIC_DRAW);
    // Update the format indexed mTestAttrib and the binding indexed mTestAttrib by
    // VertexAttribPointer.
    const GLintptr kOffset = static_cast<GLintptr>(kFloatStride * kFloatOffset);
    glVertexAttribPointer(mTestAttrib, 1, GL_FLOAT, GL_FALSE, 0,
                          reinterpret_cast<const GLvoid *>(kOffset));
    glEnableVertexAttribArray(mTestAttrib);

    constexpr GLint kTestBinding = 10;
    ASSERT_NE(mTestAttrib, kTestBinding);

    GLBuffer mBuffer2;
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer2);
    glBufferData(GL_ARRAY_BUFFER, inputData2.size() * kFloatStride, inputData2.data(),
                 GL_STATIC_DRAW);
    glBindVertexBuffer(kTestBinding, mBuffer2, 0, kFloatStride * kInputStride);

    // The attribute indexed mTestAttrib is using the binding indexed kTestBinding in the first
    // draw.
    glVertexAttribBinding(mTestAttrib, kTestBinding);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    checkPixels();
    EXPECT_GL_NO_ERROR();

    // The attribute indexed mTestAttrib is using the binding indexed mTestAttrib which should be
    // set after the call VertexAttribPointer before the first draw.
    glVertexAttribBinding(mTestAttrib, mTestAttrib);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    checkPixels();
    EXPECT_GL_NO_ERROR();
}

// Verify that using VertexAttribFormat after VertexAttribPointer won't mess up the draw.
TEST_P(VertexAttributeTestES31_OpenGL, ChangeAttribFormatAfterVertexAttribPointer)
{
    initTest();

    constexpr GLuint kFloatOffset = 10;
    std::array<GLfloat, kVertexCount + kFloatOffset> inputData;
    for (size_t count = 0; count < kVertexCount; ++count)
    {
        inputData[kFloatOffset + count] = static_cast<GLfloat>(count);
    }

    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glBufferData(GL_ARRAY_BUFFER, inputData.size() * kFloatStride, inputData.data(),
                 GL_STATIC_DRAW);

    // Call VertexAttribPointer on mTestAttrib. Now the relativeOffset of mTestAttrib should be 0.
    const GLuint kOffset = static_cast<GLuint>(kFloatStride * kFloatOffset);
    glVertexAttribPointer(mTestAttrib, 1, GL_FLOAT, GL_FALSE, 0, 0);
    glEnableVertexAttribArray(mTestAttrib);

    // Call VertexAttribFormat on mTestAttrib to modify the relativeOffset to kOffset.
    glVertexAttribFormat(mTestAttrib, 1, GL_FLOAT, GL_FALSE, kOffset);

    glDrawArrays(GL_TRIANGLES, 0, 6);
    checkPixels();
    EXPECT_GL_NO_ERROR();
}

class VertexAttributeCachingTest : public VertexAttributeTest
{
  protected:
    VertexAttributeCachingTest() {}

    void SetUp() override;

    template <typename DestT>
    static std::vector<GLfloat> GetExpectedData(const std::vector<GLubyte> &srcData,
                                                GLenum attribType,
                                                GLboolean normalized);

    void initDoubleAttribProgram()
    {
        const std::string testVertexShaderSource =
            "attribute mediump vec4 position;\n"
            "attribute mediump vec4 test;\n"
            "attribute mediump vec4 expected;\n"
            "attribute mediump vec4 test2;\n"
            "attribute mediump vec4 expected2;\n"
            "varying mediump vec4 color;\n"
            "void main(void)\n"
            "{\n"
            "    gl_Position = position;\n"
            "    vec4 threshold = max(abs(expected) * 0.01, 1.0 / 64.0);\n"
            "    color = vec4(lessThanEqual(abs(test - expected), threshold));\n"
            "    vec4 threshold2 = max(abs(expected2) * 0.01, 1.0 / 64.0);\n"
            "    color += vec4(lessThanEqual(abs(test2 - expected2), threshold2));\n"
            "}\n";

        const std::string testFragmentShaderSource =
            "varying mediump vec4 color;\n"
            "void main(void)\n"
            "{\n"
            "    gl_FragColor = color;\n"
            "}\n";

        mProgram = CompileProgram(testVertexShaderSource, testFragmentShaderSource);
        ASSERT_NE(0u, mProgram);

        mTestAttrib = glGetAttribLocation(mProgram, "test");
        ASSERT_NE(-1, mTestAttrib);
        mExpectedAttrib = glGetAttribLocation(mProgram, "expected");
        ASSERT_NE(-1, mExpectedAttrib);

        glUseProgram(mProgram);
    }

    struct AttribData
    {
        AttribData(GLenum typeIn, GLint sizeIn, GLboolean normalizedIn, GLsizei strideIn);

        GLenum type;
        GLint size;
        GLboolean normalized;
        GLsizei stride;
    };

    std::vector<AttribData> mTestData;
    std::map<GLenum, std::vector<GLfloat>> mExpectedData;
    std::map<GLenum, std::vector<GLfloat>> mNormExpectedData;
};

VertexAttributeCachingTest::AttribData::AttribData(GLenum typeIn,
                                                   GLint sizeIn,
                                                   GLboolean normalizedIn,
                                                   GLsizei strideIn)
    : type(typeIn), size(sizeIn), normalized(normalizedIn), stride(strideIn)
{
}

// static
template <typename DestT>
std::vector<GLfloat> VertexAttributeCachingTest::GetExpectedData(
    const std::vector<GLubyte> &srcData,
    GLenum attribType,
    GLboolean normalized)
{
    std::vector<GLfloat> expectedData;

    const DestT *typedSrcPtr = reinterpret_cast<const DestT *>(srcData.data());
    size_t iterations        = srcData.size() / TypeStride(attribType);

    if (normalized)
    {
        for (size_t index = 0; index < iterations; ++index)
        {
            expectedData.push_back(Normalize(typedSrcPtr[index]));
        }
    }
    else
    {
        for (size_t index = 0; index < iterations; ++index)
        {
            expectedData.push_back(static_cast<GLfloat>(typedSrcPtr[index]));
        }
    }

    return expectedData;
}

void VertexAttributeCachingTest::SetUp()
{
    VertexAttributeTest::SetUp();

    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);

    std::vector<GLubyte> srcData;
    for (size_t count = 0; count < 4; ++count)
    {
        for (GLubyte i = 0; i < std::numeric_limits<GLubyte>::max(); ++i)
        {
            srcData.push_back(i);
        }
    }

    glBufferData(GL_ARRAY_BUFFER, srcData.size(), srcData.data(), GL_STATIC_DRAW);

    GLint viewportSize[4];
    glGetIntegerv(GL_VIEWPORT, viewportSize);

    std::vector<GLenum> attribTypes;
    attribTypes.push_back(GL_BYTE);
    attribTypes.push_back(GL_UNSIGNED_BYTE);
    attribTypes.push_back(GL_SHORT);
    attribTypes.push_back(GL_UNSIGNED_SHORT);

    if (getClientMajorVersion() >= 3)
    {
        attribTypes.push_back(GL_INT);
        attribTypes.push_back(GL_UNSIGNED_INT);
    }

    constexpr GLint kMaxSize     = 4;
    constexpr GLsizei kMaxStride = 4;

    for (GLenum attribType : attribTypes)
    {
        for (GLint attribSize = 1; attribSize <= kMaxSize; ++attribSize)
        {
            for (GLsizei stride = 1; stride <= kMaxStride; ++stride)
            {
                mTestData.push_back(AttribData(attribType, attribSize, GL_FALSE, stride));
                if (attribType != GL_FLOAT)
                {
                    mTestData.push_back(AttribData(attribType, attribSize, GL_TRUE, stride));
                }
            }
        }
    }

    mExpectedData[GL_BYTE]          = GetExpectedData<GLbyte>(srcData, GL_BYTE, GL_FALSE);
    mExpectedData[GL_UNSIGNED_BYTE] = GetExpectedData<GLubyte>(srcData, GL_UNSIGNED_BYTE, GL_FALSE);
    mExpectedData[GL_SHORT]         = GetExpectedData<GLshort>(srcData, GL_SHORT, GL_FALSE);
    mExpectedData[GL_UNSIGNED_SHORT] =
        GetExpectedData<GLushort>(srcData, GL_UNSIGNED_SHORT, GL_FALSE);
    mExpectedData[GL_INT]          = GetExpectedData<GLint>(srcData, GL_INT, GL_FALSE);
    mExpectedData[GL_UNSIGNED_INT] = GetExpectedData<GLuint>(srcData, GL_UNSIGNED_INT, GL_FALSE);

    mNormExpectedData[GL_BYTE] = GetExpectedData<GLbyte>(srcData, GL_BYTE, GL_TRUE);
    mNormExpectedData[GL_UNSIGNED_BYTE] =
        GetExpectedData<GLubyte>(srcData, GL_UNSIGNED_BYTE, GL_TRUE);
    mNormExpectedData[GL_SHORT] = GetExpectedData<GLshort>(srcData, GL_SHORT, GL_TRUE);
    mNormExpectedData[GL_UNSIGNED_SHORT] =
        GetExpectedData<GLushort>(srcData, GL_UNSIGNED_SHORT, GL_TRUE);
    mNormExpectedData[GL_INT]          = GetExpectedData<GLint>(srcData, GL_INT, GL_TRUE);
    mNormExpectedData[GL_UNSIGNED_INT] = GetExpectedData<GLuint>(srcData, GL_UNSIGNED_INT, GL_TRUE);
}

// In D3D11, we must sometimes translate buffer data into static attribute caches. We also use a
// cache management scheme which garbage collects old attributes after we start using too much
// cache data. This test tries to make as many attribute caches from a single buffer as possible
// to stress-test the caching code.
TEST_P(VertexAttributeCachingTest, BufferMulticaching)
{
    if (IsAMD() && IsDesktopOpenGL())
    {
        std::cout << "Test skipped on AMD OpenGL." << std::endl;
        return;
    }

    initBasicProgram();

    glEnableVertexAttribArray(mTestAttrib);
    glEnableVertexAttribArray(mExpectedAttrib);

    ASSERT_GL_NO_ERROR();

    for (const auto &data : mTestData)
    {
        const auto &expected =
            (data.normalized) ? mNormExpectedData[data.type] : mExpectedData[data.type];

        GLsizei baseStride = static_cast<GLsizei>(data.size) * data.stride;
        GLsizei stride     = TypeStride(data.type) * baseStride;

        glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
        glVertexAttribPointer(mTestAttrib, data.size, data.type, data.normalized, stride, nullptr);
        glBindBuffer(GL_ARRAY_BUFFER, 0);
        glVertexAttribPointer(mExpectedAttrib, data.size, GL_FLOAT, GL_FALSE,
                              sizeof(GLfloat) * baseStride, expected.data());
        drawQuad(mProgram, "position", 0.5f);
        ASSERT_GL_NO_ERROR();
        EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 255, 255, 255, 255);
    }
}

// With D3D11 dirty bits for VertxArray11, we can leave vertex state unchanged if there aren't any
// GL calls that affect it. This test targets leaving one vertex attribute unchanged between draw
// calls while changing another vertex attribute enough that it clears the static buffer cache
// after enough iterations. It validates the unchanged attributes don't get deleted incidentally.
TEST_P(VertexAttributeCachingTest, BufferMulticachingWithOneUnchangedAttrib)
{
    if (IsAMD() && IsDesktopOpenGL())
    {
        std::cout << "Test skipped on AMD OpenGL." << std::endl;
        return;
    }

    initDoubleAttribProgram();

    GLint testAttrib2Location = glGetAttribLocation(mProgram, "test2");
    ASSERT_NE(-1, testAttrib2Location);
    GLint expectedAttrib2Location = glGetAttribLocation(mProgram, "expected2");
    ASSERT_NE(-1, expectedAttrib2Location);

    glEnableVertexAttribArray(mTestAttrib);
    glEnableVertexAttribArray(mExpectedAttrib);
    glEnableVertexAttribArray(testAttrib2Location);
    glEnableVertexAttribArray(expectedAttrib2Location);

    ASSERT_GL_NO_ERROR();

    // Use an attribute that we know must be converted. This is a bit sensitive.
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glVertexAttribPointer(testAttrib2Location, 3, GL_UNSIGNED_SHORT, GL_FALSE, 6, nullptr);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glVertexAttribPointer(expectedAttrib2Location, 3, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 3,
                          mExpectedData[GL_UNSIGNED_SHORT].data());

    for (const auto &data : mTestData)
    {
        const auto &expected =
            (data.normalized) ? mNormExpectedData[data.type] : mExpectedData[data.type];

        GLsizei baseStride = static_cast<GLsizei>(data.size) * data.stride;
        GLsizei stride     = TypeStride(data.type) * baseStride;

        glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
        glVertexAttribPointer(mTestAttrib, data.size, data.type, data.normalized, stride, nullptr);
        glBindBuffer(GL_ARRAY_BUFFER, 0);
        glVertexAttribPointer(mExpectedAttrib, data.size, GL_FLOAT, GL_FALSE,
                              sizeof(GLfloat) * baseStride, expected.data());
        drawQuad(mProgram, "position", 0.5f);

        ASSERT_GL_NO_ERROR();
        EXPECT_PIXEL_EQ(getWindowWidth() / 2, getWindowHeight() / 2, 255, 255, 255, 255);
    }
}

// Use this to select which configurations (e.g. which renderer, which GLES major version) these
// tests should be run against.
// D3D11 Feature Level 9_3 uses different D3D formats for vertex attribs compared to Feature Levels
// 10_0+, so we should test them separately.
ANGLE_INSTANTIATE_TEST(VertexAttributeTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES2_D3D11_FL9_3(),
                       ES2_OPENGL(),
                       ES3_OPENGL(),
                       ES2_OPENGLES(),
                       ES3_OPENGLES());

ANGLE_INSTANTIATE_TEST(VertexAttributeTestES3, ES3_D3D11(), ES3_OPENGL(), ES3_OPENGLES());

ANGLE_INSTANTIATE_TEST(VertexAttributeTestES31, ES31_D3D11(), ES31_OPENGL(), ES31_OPENGLES());

ANGLE_INSTANTIATE_TEST(VertexAttributeTestES31_OpenGL, ES31_OPENGL(), ES31_OPENGLES());

ANGLE_INSTANTIATE_TEST(VertexAttributeCachingTest,
                       ES2_D3D9(),
                       ES2_D3D11(),
                       ES3_D3D11(),
                       ES3_OPENGL());

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

Commit

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