//
// 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"

#include "util/random_utils.h"

#include <stdint.h>

using namespace angle;

class BufferDataTest : public ANGLETest
{
  protected:
    BufferDataTest()
    {
        setWindowWidth(16);
        setWindowHeight(16);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
        setConfigDepthBits(24);

        mBuffer         = 0;
        mProgram        = 0;
        mAttribLocation = -1;
    }

    void testSetUp() override
    {
        constexpr char kVS[] = R"(attribute vec4 position;
attribute float in_attrib;
varying float v_attrib;
void main()
{
    v_attrib = in_attrib;
    gl_Position = position;
})";

        constexpr char kFS[] = R"(precision mediump float;
varying float v_attrib;
void main()
{
    gl_FragColor = vec4(v_attrib, 0, 0, 1);
})";

        glGenBuffers(1, &mBuffer);
        ASSERT_NE(mBuffer, 0U);

        mProgram = CompileProgram(kVS, kFS);
        ASSERT_NE(mProgram, 0U);

        mAttribLocation = glGetAttribLocation(mProgram, "in_attrib");
        ASSERT_NE(mAttribLocation, -1);

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

        glDisable(GL_DEPTH_TEST);

        ASSERT_GL_NO_ERROR();
    }

    void testTearDown() override
    {
        glDeleteBuffers(1, &mBuffer);
        glDeleteProgram(mProgram);
    }

    GLuint mBuffer;
    GLuint mProgram;
    GLint mAttribLocation;
};

// Disabled in debug because it's way too slow.
#if !defined(NDEBUG)
#    define MAYBE_NULLData DISABLED_NULLData
#else
#    define MAYBE_NULLData NULLData
#endif  // !defined(NDEBUG)

TEST_P(BufferDataTest, MAYBE_NULLData)
{
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    EXPECT_GL_NO_ERROR();

    const int numIterations = 128;
    for (int i = 0; i < numIterations; ++i)
    {
        GLsizei bufferSize = sizeof(GLfloat) * (i + 1);
        glBufferData(GL_ARRAY_BUFFER, bufferSize, nullptr, GL_STATIC_DRAW);
        EXPECT_GL_NO_ERROR();

        for (int j = 0; j < bufferSize; j++)
        {
            for (int k = 0; k < bufferSize - j; k++)
            {
                glBufferSubData(GL_ARRAY_BUFFER, k, j, nullptr);
                ASSERT_GL_NO_ERROR();
            }
        }
    }
}

TEST_P(BufferDataTest, ZeroNonNULLData)
{
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    EXPECT_GL_NO_ERROR();

    char *zeroData = new char[0];
    glBufferData(GL_ARRAY_BUFFER, 0, zeroData, GL_STATIC_DRAW);
    EXPECT_GL_NO_ERROR();

    glBufferSubData(GL_ARRAY_BUFFER, 0, 0, zeroData);
    EXPECT_GL_NO_ERROR();

    delete[] zeroData;
}

TEST_P(BufferDataTest, NULLResolvedData)
{
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glBufferData(GL_ARRAY_BUFFER, 128, nullptr, GL_DYNAMIC_DRAW);

    glUseProgram(mProgram);
    glVertexAttribPointer(mAttribLocation, 1, GL_FLOAT, GL_FALSE, 4, nullptr);
    glEnableVertexAttribArray(mAttribLocation);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

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

// Internally in D3D, we promote dynamic data to static after many draw loops. This code tests
// path.
TEST_P(BufferDataTest, RepeatedDrawWithDynamic)
{
    std::vector<GLfloat> data;
    for (int i = 0; i < 16; ++i)
    {
        data.push_back(static_cast<GLfloat>(i));
    }

    glUseProgram(mProgram);
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * data.size(), data.data(), GL_DYNAMIC_DRAW);
    glVertexAttribPointer(mAttribLocation, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glEnableVertexAttribArray(mAttribLocation);

    for (int drawCount = 0; drawCount < 40; ++drawCount)
    {
        drawQuad(mProgram, "position", 0.5f);
    }

    EXPECT_GL_NO_ERROR();
}

// Tests for a bug where vertex attribute translation was not being invalidated when switching to
// DYNAMIC
TEST_P(BufferDataTest, RepeatedDrawDynamicBug)
{
    // http://anglebug.com/2843: Seems to be an Intel driver bug.
    ANGLE_SKIP_TEST_IF(IsVulkan() && IsIntel() && IsWindows());

    glUseProgram(mProgram);

    GLint positionLocation = glGetAttribLocation(mProgram, "position");
    ASSERT_NE(-1, positionLocation);

    auto quadVertices = GetQuadVertices();
    for (angle::Vector3 &vertex : quadVertices)
    {
        vertex.x() *= 1.0f;
        vertex.y() *= 1.0f;
        vertex.z() = 0.0f;
    }

    // Set up quad vertices with DYNAMIC data
    GLBuffer positionBuffer;
    glBindBuffer(GL_ARRAY_BUFFER, positionBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * quadVertices.size() * 3, quadVertices.data(),
                 GL_DYNAMIC_DRAW);
    glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
    glEnableVertexAttribArray(positionLocation);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    EXPECT_GL_NO_ERROR();

    // Set up color data so red is drawn
    std::vector<GLfloat> data(6, 1.0f);

    // Set data to DYNAMIC
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * data.size(), data.data(), GL_DYNAMIC_DRAW);
    glVertexAttribPointer(mAttribLocation, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
    glEnableVertexAttribArray(mAttribLocation);
    EXPECT_GL_NO_ERROR();

    // Draw enough times to promote data to DIRECT mode
    for (int i = 0; i < 20; i++)
    {
        glDrawArrays(GL_TRIANGLES, 0, 6);
    }

    // Verify red was drawn
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);

    // Set up color value so black is drawn
    std::fill(data.begin(), data.end(), 0.0f);

    // Update the data, changing back to DYNAMIC mode.
    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * data.size(), data.data(), GL_DYNAMIC_DRAW);

    // This draw should produce a black quad
    glDrawArrays(GL_TRIANGLES, 0, 6);
    EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::black);
    EXPECT_GL_NO_ERROR();
}

class IndexedBufferCopyTest : public ANGLETest
{
  protected:
    IndexedBufferCopyTest()
    {
        setWindowWidth(16);
        setWindowHeight(16);
        setConfigRedBits(8);
        setConfigGreenBits(8);
        setConfigBlueBits(8);
        setConfigAlphaBits(8);
        setConfigDepthBits(24);
    }

    void testSetUp() override
    {
        constexpr char kVS[] = R"(attribute vec3 in_attrib;
varying vec3 v_attrib;
void main()
{
    v_attrib = in_attrib;
    gl_Position = vec4(0.0, 0.0, 0.5, 1.0);
    gl_PointSize = 100.0;
})";

        constexpr char kFS[] = R"(precision mediump float;
varying vec3 v_attrib;
void main()
{
    gl_FragColor = vec4(v_attrib, 1);
})";

        glGenBuffers(2, mBuffers);
        ASSERT_NE(mBuffers[0], 0U);
        ASSERT_NE(mBuffers[1], 0U);

        glGenBuffers(1, &mElementBuffer);
        ASSERT_NE(mElementBuffer, 0U);

        mProgram = CompileProgram(kVS, kFS);
        ASSERT_NE(mProgram, 0U);

        mAttribLocation = glGetAttribLocation(mProgram, "in_attrib");
        ASSERT_NE(mAttribLocation, -1);

        glClearColor(0, 0, 0, 0);
        glDisable(GL_DEPTH_TEST);
        glClear(GL_COLOR_BUFFER_BIT);

        ASSERT_GL_NO_ERROR();
    }

    void testTearDown() override
    {
        glDeleteBuffers(2, mBuffers);
        glDeleteBuffers(1, &mElementBuffer);
        glDeleteProgram(mProgram);
    }

    GLuint mBuffers[2];
    GLuint mElementBuffer;
    GLuint mProgram;
    GLint mAttribLocation;
};

// The following test covers an ANGLE bug where our index ranges
// weren't updated from CopyBufferSubData calls
// https://code.google.com/p/angleproject/issues/detail?id=709
TEST_P(IndexedBufferCopyTest, IndexRangeBug)
{
    // http://anglebug.com/4092
    ANGLE_SKIP_TEST_IF(isSwiftshader());
    // TODO(geofflang): Figure out why this fails on AMD OpenGL (http://anglebug.com/1291)
    ANGLE_SKIP_TEST_IF(IsAMD() && IsOpenGL());

    unsigned char vertexData[] = {255, 0, 0, 0, 0, 0};
    unsigned int indexData[]   = {0, 1};

    glBindBuffer(GL_ARRAY_BUFFER, mBuffers[0]);
    glBufferData(GL_ARRAY_BUFFER, sizeof(char) * 6, vertexData, GL_STATIC_DRAW);

    glUseProgram(mProgram);
    glVertexAttribPointer(mAttribLocation, 3, GL_UNSIGNED_BYTE, GL_TRUE, 3, nullptr);
    glEnableVertexAttribArray(mAttribLocation);

    ASSERT_GL_NO_ERROR();

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mElementBuffer);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(int) * 1, indexData, GL_STATIC_DRAW);

    glUseProgram(mProgram);

    ASSERT_GL_NO_ERROR();

    glDrawElements(GL_POINTS, 1, GL_UNSIGNED_INT, nullptr);

    EXPECT_GL_NO_ERROR();
    EXPECT_PIXEL_EQ(0, 0, 255, 0, 0, 255);

    glBindBuffer(GL_COPY_READ_BUFFER, mBuffers[1]);
    glBufferData(GL_COPY_READ_BUFFER, 4, &indexData[1], GL_STATIC_DRAW);

    glBindBuffer(GL_COPY_WRITE_BUFFER, mElementBuffer);

    glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0, sizeof(int));

    ASSERT_GL_NO_ERROR();

    glClear(GL_COLOR_BUFFER_BIT);
    EXPECT_PIXEL_EQ(0, 0, 0, 0, 0, 0);

    unsigned char newData[] = {0, 255, 0};
    glBufferSubData(GL_ARRAY_BUFFER, 3, 3, newData);

    glDrawElements(GL_POINTS, 1, GL_UNSIGNED_INT, nullptr);

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

class BufferDataTestES3 : public BufferDataTest
{};

// The following test covers an ANGLE bug where the buffer storage
// is not resized by Buffer11::getLatestBufferStorage when needed.
// https://code.google.com/p/angleproject/issues/detail?id=897
TEST_P(BufferDataTestES3, BufferResizing)
{
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    ASSERT_GL_NO_ERROR();

    // Allocate a buffer with one byte
    uint8_t singleByte[] = {0xaa};
    glBufferData(GL_ARRAY_BUFFER, 1, singleByte, GL_STATIC_DRAW);

    // Resize the buffer
    // To trigger the bug, the buffer need to be big enough because some hardware copy buffers
    // by chunks of pages instead of the minimum number of bytes needed.
    const size_t numBytes = 4096 * 4;
    glBufferData(GL_ARRAY_BUFFER, numBytes, nullptr, GL_STATIC_DRAW);

    // Copy the original data to the buffer
    uint8_t srcBytes[numBytes];
    for (size_t i = 0; i < numBytes; ++i)
    {
        srcBytes[i] = static_cast<uint8_t>(i);
    }

    void *dest = glMapBufferRange(GL_ARRAY_BUFFER, 0, numBytes,
                                  GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);

    ASSERT_GL_NO_ERROR();

    memcpy(dest, srcBytes, numBytes);
    glUnmapBuffer(GL_ARRAY_BUFFER);

    EXPECT_GL_NO_ERROR();

    // Create a new buffer and copy the data to it
    GLuint readBuffer;
    glGenBuffers(1, &readBuffer);
    glBindBuffer(GL_COPY_WRITE_BUFFER, readBuffer);
    uint8_t zeros[numBytes];
    for (size_t i = 0; i < numBytes; ++i)
    {
        zeros[i] = 0;
    }
    glBufferData(GL_COPY_WRITE_BUFFER, numBytes, zeros, GL_STATIC_DRAW);
    glCopyBufferSubData(GL_ARRAY_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0, numBytes);

    ASSERT_GL_NO_ERROR();

    // Read back the data and compare it to the original
    uint8_t *data = reinterpret_cast<uint8_t *>(
        glMapBufferRange(GL_COPY_WRITE_BUFFER, 0, numBytes, GL_MAP_READ_BIT));

    ASSERT_GL_NO_ERROR();

    for (size_t i = 0; i < numBytes; ++i)
    {
        EXPECT_EQ(srcBytes[i], data[i]);
    }
    glUnmapBuffer(GL_COPY_WRITE_BUFFER);

    glDeleteBuffers(1, &readBuffer);

    EXPECT_GL_NO_ERROR();
}

// Verify the functionality of glMapBufferRange()'s GL_MAP_UNSYNCHRONIZED_BIT
// NOTE: On Vulkan, if we ever use memory that's not `VK_MEMORY_PROPERTY_HOST_COHERENT_BIT`, then
// this could incorrectly pass.
TEST_P(BufferDataTestES3, MapBufferRangeUnsynchronizedBit)
{
    // We can currently only control the behavior of the Vulkan backend's synchronizing operation's
    ANGLE_SKIP_TEST_IF(!IsVulkan());

    const size_t numElements = 10;
    std::vector<uint8_t> srcData(numElements);
    std::vector<uint8_t> dstData(numElements);

    for (uint8_t i = 0; i < srcData.size(); i++)
    {
        srcData[i] = i;
    }
    for (uint8_t i = 0; i < dstData.size(); i++)
    {
        dstData[i] = static_cast<uint8_t>(i + dstData.size());
    }

    GLBuffer srcBuffer;
    GLBuffer dstBuffer;

    glBindBuffer(GL_COPY_READ_BUFFER, srcBuffer);
    ASSERT_GL_NO_ERROR();
    glBindBuffer(GL_COPY_WRITE_BUFFER, dstBuffer);
    ASSERT_GL_NO_ERROR();

    glBufferData(GL_COPY_READ_BUFFER, srcData.size(), srcData.data(), GL_STATIC_DRAW);
    ASSERT_GL_NO_ERROR();
    glBufferData(GL_COPY_WRITE_BUFFER, dstData.size(), dstData.data(), GL_STATIC_READ);
    ASSERT_GL_NO_ERROR();

    glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0, numElements);

    // With GL_MAP_UNSYNCHRONIZED_BIT, we expect the data to be stale and match dstData
    // NOTE: We are specifying GL_MAP_WRITE_BIT so we can use GL_MAP_UNSYNCHRONIZED_BIT. This is
    // venturing into undefined behavior, since we are actually planning on reading from this
    // pointer.
    auto *data = reinterpret_cast<uint8_t *>(glMapBufferRange(
        GL_COPY_WRITE_BUFFER, 0, numElements, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT));
    EXPECT_GL_NO_ERROR();
    for (size_t i = 0; i < numElements; ++i)
    {
        EXPECT_EQ(dstData[i], data[i]);
    }
    glUnmapBuffer(GL_COPY_WRITE_BUFFER);
    EXPECT_GL_NO_ERROR();

    // Without GL_MAP_UNSYNCHRONIZED_BIT, we expect the data to be copied and match srcData
    data = reinterpret_cast<uint8_t *>(
        glMapBufferRange(GL_COPY_WRITE_BUFFER, 0, numElements, GL_MAP_READ_BIT));
    EXPECT_GL_NO_ERROR();
    for (size_t i = 0; i < numElements; ++i)
    {
        EXPECT_EQ(srcData[i], data[i]);
    }
    glUnmapBuffer(GL_COPY_WRITE_BUFFER);
    EXPECT_GL_NO_ERROR();
}

// Verify OES_mapbuffer is present if EXT_map_buffer_range is.
TEST_P(BufferDataTest, ExtensionDependency)
{
    if (IsGLExtensionEnabled("GL_EXT_map_buffer_range"))
    {
        ASSERT_TRUE(IsGLExtensionEnabled("GL_OES_mapbuffer"));
    }
}

// Test mapping with the OES extension.
TEST_P(BufferDataTest, MapBufferOES)
{
    if (!IsGLExtensionEnabled("GL_EXT_map_buffer_range"))
    {
        // Needed for test validation.
        return;
    }

    std::vector<uint8_t> data(1024);
    FillVectorWithRandomUBytes(&data);

    GLBuffer buffer;
    glBindBuffer(GL_ARRAY_BUFFER, buffer.get());
    glBufferData(GL_ARRAY_BUFFER, data.size(), nullptr, GL_STATIC_DRAW);

    // Validate that other map flags don't work.
    void *badMapPtr = glMapBufferOES(GL_ARRAY_BUFFER, GL_MAP_READ_BIT);
    EXPECT_EQ(nullptr, badMapPtr);
    EXPECT_GL_ERROR(GL_INVALID_ENUM);

    // Map and write.
    void *mapPtr = glMapBufferOES(GL_ARRAY_BUFFER, GL_WRITE_ONLY_OES);
    ASSERT_NE(nullptr, mapPtr);
    ASSERT_GL_NO_ERROR();
    memcpy(mapPtr, data.data(), data.size());
    glUnmapBufferOES(GL_ARRAY_BUFFER);

    // Validate data with EXT_map_buffer_range
    void *readMapPtr = glMapBufferRangeEXT(GL_ARRAY_BUFFER, 0, data.size(), GL_MAP_READ_BIT_EXT);
    ASSERT_NE(nullptr, readMapPtr);
    ASSERT_GL_NO_ERROR();
    std::vector<uint8_t> actualData(data.size());
    memcpy(actualData.data(), readMapPtr, data.size());
    glUnmapBufferOES(GL_ARRAY_BUFFER);

    EXPECT_EQ(data, actualData);
}

// Tests a bug where copying buffer data immediately after creation hit a nullptr in D3D11.
TEST_P(BufferDataTestES3, NoBufferInitDataCopyBug)
{
    constexpr GLsizei size = 64;

    GLBuffer sourceBuffer;
    glBindBuffer(GL_COPY_READ_BUFFER, sourceBuffer);
    glBufferData(GL_COPY_READ_BUFFER, size, nullptr, GL_STATIC_DRAW);

    GLBuffer destBuffer;
    glBindBuffer(GL_ARRAY_BUFFER, destBuffer);
    glBufferData(GL_ARRAY_BUFFER, size, nullptr, GL_STATIC_DRAW);

    glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_ARRAY_BUFFER, 0, 0, size);
    ASSERT_GL_NO_ERROR();
}

// Use this to select which configurations (e.g. which renderer, which GLES major version) these
// tests should be run against.
ANGLE_INSTANTIATE_TEST_ES2(BufferDataTest);
ANGLE_INSTANTIATE_TEST_ES3(BufferDataTestES3);
ANGLE_INSTANTIATE_TEST_ES3(IndexedBufferCopyTest);

#ifdef _WIN64

// Test a bug where an integer overflow bug could trigger a crash in D3D.
// The test uses 8 buffers with a size just under 0x2000000 to overflow max uint
// (with the internal D3D rounding to 16-byte values) and trigger the bug.
// Only handle this bug on 64-bit Windows for now. Harder to repro on 32-bit.
class BufferDataOverflowTest : public ANGLETest
{
  protected:
    BufferDataOverflowTest() {}
};

// See description above.
TEST_P(BufferDataOverflowTest, VertexBufferIntegerOverflow)
{
    // http://anglebug.com/3786: flaky timeout on Win10 FYI x64 Release (NVIDIA GeForce GTX 1660)
    ANGLE_SKIP_TEST_IF(IsWindows() && IsNVIDIA() && IsD3D11());
    // http://anglebug.com/4092
    ANGLE_SKIP_TEST_IF(IsWindows() && (IsVulkan() || IsOpenGL()));

    // These values are special, to trigger the rounding bug.
    unsigned int numItems       = 0x7FFFFFE;
    constexpr GLsizei bufferCnt = 8;

    std::vector<GLBuffer> buffers(bufferCnt);

    std::stringstream vertexShaderStr;

    for (GLsizei bufferIndex = 0; bufferIndex < bufferCnt; ++bufferIndex)
    {
        vertexShaderStr << "attribute float attrib" << bufferIndex << ";\n";
    }

    vertexShaderStr << "attribute vec2 position;\n"
                       "varying float v_attrib;\n"
                       "void main() {\n"
                       "  gl_Position = vec4(position, 0, 1);\n"
                       "  v_attrib = 0.0;\n";

    for (GLsizei bufferIndex = 0; bufferIndex < bufferCnt; ++bufferIndex)
    {
        vertexShaderStr << "v_attrib += attrib" << bufferIndex << ";\n";
    }

    vertexShaderStr << "}";

    constexpr char kFS[] =
        "varying highp float v_attrib;\n"
        "void main() {\n"
        "  gl_FragColor = vec4(v_attrib, 0, 0, 1);\n"
        "}";

    ANGLE_GL_PROGRAM(program, vertexShaderStr.str().c_str(), kFS);
    glUseProgram(program.get());

    std::vector<GLfloat> data(numItems, 1.0f);

    for (GLsizei bufferIndex = 0; bufferIndex < bufferCnt; ++bufferIndex)
    {
        glBindBuffer(GL_ARRAY_BUFFER, buffers[bufferIndex].get());
        glBufferData(GL_ARRAY_BUFFER, numItems * sizeof(float), &data[0], GL_DYNAMIC_DRAW);

        std::stringstream attribNameStr;
        attribNameStr << "attrib" << bufferIndex;

        GLint attribLocation = glGetAttribLocation(program.get(), attribNameStr.str().c_str());
        ASSERT_NE(-1, attribLocation);

        glVertexAttribPointer(attribLocation, 1, GL_FLOAT, GL_FALSE, 4, nullptr);
        glEnableVertexAttribArray(attribLocation);
    }

    GLint positionLocation = glGetAttribLocation(program.get(), "position");
    ASSERT_NE(-1, positionLocation);
    glDisableVertexAttribArray(positionLocation);
    glVertexAttrib2f(positionLocation, 1.0f, 1.0f);

    EXPECT_GL_NO_ERROR();
    glDrawArrays(GL_TRIANGLES, 0, numItems);
    EXPECT_GL_ERROR(GL_OUT_OF_MEMORY);

    // Test that a small draw still works.
    for (GLsizei bufferIndex = 0; bufferIndex < bufferCnt; ++bufferIndex)
    {
        std::stringstream attribNameStr;
        attribNameStr << "attrib" << bufferIndex;
        GLint attribLocation = glGetAttribLocation(program.get(), attribNameStr.str().c_str());
        ASSERT_NE(-1, attribLocation);
        glDisableVertexAttribArray(attribLocation);
    }

    glDrawArrays(GL_TRIANGLES, 0, 3);
    EXPECT_GL_ERROR(GL_NO_ERROR);
}

// Tests a security bug in our CopyBufferSubData validation (integer overflow).
TEST_P(BufferDataOverflowTest, CopySubDataValidation)
{
    GLBuffer readBuffer, writeBuffer;

    glBindBuffer(GL_COPY_READ_BUFFER, readBuffer.get());
    glBindBuffer(GL_COPY_WRITE_BUFFER, writeBuffer.get());

    constexpr int bufSize = 100;

    glBufferData(GL_COPY_READ_BUFFER, bufSize, nullptr, GL_STATIC_DRAW);
    glBufferData(GL_COPY_WRITE_BUFFER, bufSize, nullptr, GL_STATIC_DRAW);

    GLintptr big = std::numeric_limits<GLintptr>::max() - bufSize + 90;

    glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, big, 0, 50);
    EXPECT_GL_ERROR(GL_INVALID_VALUE);

    glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, big, 50);
    EXPECT_GL_ERROR(GL_INVALID_VALUE);
}

ANGLE_INSTANTIATE_TEST_ES3(BufferDataOverflowTest);

#endif  // _WIN64