/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES 3.1 Module
 * -------------------------------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief Vertex attribute binding stress tests.
 *//*--------------------------------------------------------------------*/

#include "es31sVertexAttributeBindingTests.hpp"
#include "tcuVector.hpp"
#include "tcuTestLog.hpp"
#include "tcuRenderTarget.hpp"
#include "tcuSurface.hpp"
#include "gluCallLogWrapper.hpp"
#include "gluObjectWrapper.hpp"
#include "gluPixelTransfer.hpp"
#include "gluRenderContext.hpp"
#include "gluShaderProgram.hpp"
#include "gluStrUtil.hpp"
#include "glwFunctions.hpp"
#include "glwEnums.hpp"
#include "deStringUtil.hpp"

namespace deqp
{
namespace gles31
{
namespace Stress
{
namespace
{

static const char *const s_vertexSource = "#version 310 es\n"
                                          "in highp vec4 a_position;\n"
                                          "void main (void)\n"
                                          "{\n"
                                          "    gl_Position = a_position;\n"
                                          "}\n";

static const char *const s_fragmentSource = "#version 310 es\n"
                                            "layout(location = 0) out mediump vec4 fragColor;\n"
                                            "void main (void)\n"
                                            "{\n"
                                            "    fragColor = vec4(1.0, 1.0, 1.0, 1.0);\n"
                                            "}\n";

static const char *const s_colorFragmentShader = "#version 310 es\n"
                                                 "in mediump vec4 v_color;\n"
                                                 "layout(location = 0) out mediump vec4 fragColor;\n"
                                                 "void main (void)\n"
                                                 "{\n"
                                                 "    fragColor = v_color;\n"
                                                 "}\n";

// Verifies image contains only yellow or greeen, or a linear combination
// of these colors.
static bool verifyImageYellowGreen(const tcu::Surface &image, tcu::TestLog &log, bool logImageOnSuccess)
{
    using tcu::TestLog;

    const int colorThreshold = 20;

    tcu::Surface error(image.getWidth(), image.getHeight());
    bool isOk = true;

    log << TestLog::Message << "Verifying image contents." << TestLog::EndMessage;

    for (int y = 0; y < image.getHeight(); y++)
        for (int x = 0; x < image.getWidth(); x++)
        {
            const tcu::RGBA pixel = image.getPixel(x, y);
            bool pixelOk          = true;

            // Any pixel with !(G ~= 255) is faulty (not a linear combinations of green and yellow)
            if (de::abs(pixel.getGreen() - 255) > colorThreshold)
                pixelOk = false;

            // Any pixel with !(B ~= 0) is faulty (not a linear combinations of green and yellow)
            if (de::abs(pixel.getBlue() - 0) > colorThreshold)
                pixelOk = false;

            error.setPixel(x, y, (pixelOk) ? (tcu::RGBA(0, 255, 0, 255)) : (tcu::RGBA(255, 0, 0, 255)));
            isOk = isOk && pixelOk;
        }

    if (!isOk)
    {
        log << TestLog::Message << "Image verification failed." << TestLog::EndMessage;
        log << TestLog::ImageSet("Verfication result", "Result of rendering")
            << TestLog::Image("Result", "Result", image) << TestLog::Image("ErrorMask", "Error mask", error)
            << TestLog::EndImageSet;
    }
    else
    {
        log << TestLog::Message << "Image verification passed." << TestLog::EndMessage;

        if (logImageOnSuccess)
            log << TestLog::ImageSet("Verfication result", "Result of rendering")
                << TestLog::Image("Result", "Result", image) << TestLog::EndImageSet;
    }

    return isOk;
}

class BindingRenderCase : public TestCase
{
public:
    enum
    {
        TEST_RENDER_SIZE = 64
    };

    BindingRenderCase(Context &ctx, const char *name, const char *desc, bool unalignedData);
    virtual ~BindingRenderCase(void);

    virtual void init(void);
    virtual void deinit(void);
    IterateResult iterate(void);

private:
    virtual void renderTo(tcu::Surface &dst) = 0;
    virtual void createBuffers(void)         = 0;
    virtual void createShader(void)          = 0;

protected:
    const bool m_unalignedData;
    glw::GLuint m_vao;
    glu::ShaderProgram *m_program;
};

BindingRenderCase::BindingRenderCase(Context &ctx, const char *name, const char *desc, bool unalignedData)
    : TestCase(ctx, name, desc)
    , m_unalignedData(unalignedData)
    , m_vao(0)
    , m_program(nullptr)
{
}

BindingRenderCase::~BindingRenderCase(void)
{
    deinit();
}

void BindingRenderCase::init(void)
{
    // check requirements
    if (m_context.getRenderTarget().getWidth() < TEST_RENDER_SIZE ||
        m_context.getRenderTarget().getHeight() < TEST_RENDER_SIZE)
        throw tcu::NotSupportedError("Test requires at least " + de::toString<int>(TEST_RENDER_SIZE) + "x" +
                                     de::toString<int>(TEST_RENDER_SIZE) + " render target");

    // resources
    m_context.getRenderContext().getFunctions().genVertexArrays(1, &m_vao);
    if (m_context.getRenderContext().getFunctions().getError() != GL_NO_ERROR)
        throw tcu::TestError("could not gen vao");

    createBuffers();
    createShader();
}

void BindingRenderCase::deinit(void)
{
    if (m_vao)
    {
        m_context.getRenderContext().getFunctions().deleteVertexArrays(1, &m_vao);
        m_vao = 0;
    }

    delete m_program;
    m_program = nullptr;
}

BindingRenderCase::IterateResult BindingRenderCase::iterate(void)
{
    tcu::Surface surface(TEST_RENDER_SIZE, TEST_RENDER_SIZE);

    // draw pattern

    renderTo(surface);

    // verify results

    if (verifyImageYellowGreen(surface, m_testCtx.getLog(), false))
        m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
    else if (m_unalignedData)
        m_testCtx.setTestResult(QP_TEST_RESULT_COMPATIBILITY_WARNING, "Failed to draw with unaligned data");
    else
        m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Image verification failed");

    return STOP;
}

class SingleBindingCase : public BindingRenderCase
{
public:
    enum CaseFlag
    {
        FLAG_ATTRIB_UNALIGNED = (1 << 0), // !< unalign attributes with relativeOffset
        FLAG_ATTRIB_ALIGNED =
            (1 << 1), // !< align attributes with relativeOffset to the buffer begin (and not buffer offset)
        FLAG_ATTRIBS_MULTIPLE_ELEMS = (1 << 2), // !< use multiple attribute elements
        FLAG_ATTRIBS_SHARED_ELEMS =
            (1 << 3), // !< use multiple shared attribute elements. xyzw & rgba stored as (x, y, zr, wg, b, a)

        FLAG_BUF_ALIGNED_OFFSET   = (1 << 4), // !< use aligned offset to the buffer object
        FLAG_BUF_UNALIGNED_OFFSET = (1 << 5), // !< use unaligned offset to the buffer object
        FLAG_BUF_UNALIGNED_STRIDE = (1 << 6), // !< unalign buffer elements
    };
    SingleBindingCase(Context &ctx, const char *name, int flags);
    ~SingleBindingCase(void);

    void init(void);
    void deinit(void);

private:
    struct TestSpec
    {
        int bufferOffset;
        int bufferStride;
        int positionAttrOffset;
        int colorAttrOffset;
        bool hasColorAttr;
    };

    enum
    {
        GRID_SIZE = 20
    };

    void renderTo(tcu::Surface &dst);

    static TestSpec genTestSpec(int flags);
    static std::string genTestDescription(int flags);
    static bool isDataUnaligned(int flags);

    void createBuffers(void);
    void createShader(void);
    std::string genVertexSource(void);

    const TestSpec m_spec;
    glw::GLuint m_buf;
};

SingleBindingCase::SingleBindingCase(Context &ctx, const char *name, int flags)
    : BindingRenderCase(ctx, name, genTestDescription(flags).c_str(), isDataUnaligned(flags))
    , m_spec(genTestSpec(flags))
    , m_buf(0)
{
    DE_ASSERT(!((flags & FLAG_ATTRIB_UNALIGNED) && (flags & FLAG_ATTRIB_ALIGNED)));
    DE_ASSERT(!((flags & FLAG_ATTRIB_ALIGNED) && (flags & FLAG_BUF_UNALIGNED_STRIDE)));

    DE_ASSERT(isDataUnaligned(flags));
}

SingleBindingCase::~SingleBindingCase(void)
{
    deinit();
}

void SingleBindingCase::init(void)
{
    // log what we are trying to do

    m_testCtx.getLog() << tcu::TestLog::Message << "Rendering " << (int)GRID_SIZE << "x" << (int)GRID_SIZE << " grid.\n"
                       << "Buffer format:\n"
                       << "    bufferOffset: " << m_spec.bufferOffset << "\n"
                       << "    bufferStride: " << m_spec.bufferStride << "\n"
                       << "Vertex position format:\n"
                       << "    type: float4\n"
                       << "    offset: " << m_spec.positionAttrOffset << "\n"
                       << "    total offset: " << m_spec.bufferOffset + m_spec.positionAttrOffset << "\n"
                       << tcu::TestLog::EndMessage;

    if (m_spec.hasColorAttr)
        m_testCtx.getLog() << tcu::TestLog::Message << "Color:\n"
                           << "    type: float4\n"
                           << "    offset: " << m_spec.colorAttrOffset << "\n"
                           << "    total offset: " << m_spec.bufferOffset + m_spec.colorAttrOffset << "\n"
                           << tcu::TestLog::EndMessage;
    // init

    BindingRenderCase::init();
}

void SingleBindingCase::deinit(void)
{
    if (m_buf)
    {
        m_context.getRenderContext().getFunctions().deleteBuffers(1, &m_buf);
        m_buf = 0;
    }

    BindingRenderCase::deinit();
}

void SingleBindingCase::renderTo(tcu::Surface &dst)
{
    glu::CallLogWrapper gl(m_context.getRenderContext().getFunctions(), m_testCtx.getLog());
    const int positionLoc     = gl.glGetAttribLocation(m_program->getProgram(), "a_position");
    const int colorLoc        = gl.glGetAttribLocation(m_program->getProgram(), "a_color");
    const int colorUniformLoc = gl.glGetUniformLocation(m_program->getProgram(), "u_color");

    gl.enableLogging(true);

    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    gl.glClear(GL_COLOR_BUFFER_BIT);
    gl.glViewport(0, 0, dst.getWidth(), dst.getHeight());
    gl.glBindVertexArray(m_vao);
    GLU_EXPECT_NO_ERROR(gl.glGetError(), "set vao");

    gl.glUseProgram(m_program->getProgram());
    GLU_EXPECT_NO_ERROR(gl.glGetError(), "use program");

    if (m_spec.hasColorAttr)
    {
        gl.glBindVertexBuffer(3, m_buf, m_spec.bufferOffset, m_spec.bufferStride);

        gl.glVertexAttribBinding(positionLoc, 3);
        gl.glVertexAttribFormat(positionLoc, 4, GL_FLOAT, GL_FALSE, m_spec.positionAttrOffset);
        gl.glEnableVertexAttribArray(positionLoc);

        gl.glVertexAttribBinding(colorLoc, 3);
        gl.glVertexAttribFormat(colorLoc, 4, GL_FLOAT, GL_FALSE, m_spec.colorAttrOffset);
        gl.glEnableVertexAttribArray(colorLoc);

        GLU_EXPECT_NO_ERROR(gl.glGetError(), "set va");

        gl.glDrawArrays(GL_TRIANGLES, 0, GRID_SIZE * GRID_SIZE * 6);
        GLU_EXPECT_NO_ERROR(gl.glGetError(), "draw");
    }
    else
    {
        gl.glBindVertexBuffer(3, m_buf, m_spec.bufferOffset, m_spec.bufferStride);
        gl.glVertexAttribBinding(positionLoc, 3);
        gl.glVertexAttribFormat(positionLoc, 4, GL_FLOAT, GL_FALSE, m_spec.positionAttrOffset);
        gl.glEnableVertexAttribArray(positionLoc);

        GLU_EXPECT_NO_ERROR(gl.glGetError(), "set va");
        gl.glUniform4f(colorUniformLoc, 0.0f, 1.0f, 0.0f, 1.0f);

        gl.glDrawArrays(GL_TRIANGLES, 0, GRID_SIZE * GRID_SIZE * 6);
        GLU_EXPECT_NO_ERROR(gl.glGetError(), "draw");
    }

    gl.glFinish();
    gl.glBindVertexArray(0);
    gl.glUseProgram(0);
    GLU_EXPECT_NO_ERROR(gl.glGetError(), "clean");

    glu::readPixels(m_context.getRenderContext(), 0, 0, dst.getAccess());
}

SingleBindingCase::TestSpec SingleBindingCase::genTestSpec(int flags)
{
    const int datumSize          = 4;
    const int bufferOffset       = (flags & FLAG_BUF_ALIGNED_OFFSET)   ? (32) :
                                   (flags & FLAG_BUF_UNALIGNED_OFFSET) ? (19) :
                                                                         (0);
    const int attrBufAlignment   = ((bufferOffset % datumSize) == 0) ? (0) : (datumSize - (bufferOffset % datumSize));
    const int positionAttrOffset = (flags & FLAG_ATTRIB_UNALIGNED) ? (3) :
                                   (flags & FLAG_ATTRIB_ALIGNED)   ? (attrBufAlignment) :
                                                                     (0);
    const bool hasColorAttr      = (flags & FLAG_ATTRIBS_SHARED_ELEMS) || (flags & FLAG_ATTRIBS_MULTIPLE_ELEMS);
    const int colorAttrOffset    = (flags & FLAG_ATTRIBS_SHARED_ELEMS)   ? (2 * datumSize) :
                                   (flags & FLAG_ATTRIBS_MULTIPLE_ELEMS) ? (4 * datumSize) :
                                                                           (-1);

    const int bufferStrideBase = de::max(positionAttrOffset + 4 * datumSize, colorAttrOffset + 4 * datumSize);
    const int bufferStrideAlignment =
        ((bufferStrideBase % datumSize) == 0) ? (0) : (datumSize - (bufferStrideBase % datumSize));
    const int bufferStridePadding =
        ((flags & FLAG_BUF_UNALIGNED_STRIDE) && deIsAligned32(bufferStrideBase, datumSize)) ? (13) :
        (!(flags & FLAG_BUF_UNALIGNED_STRIDE) && !deIsAligned32(bufferStrideBase, datumSize)) ?
                                                                                              (bufferStrideAlignment) :
                                                                                              (0);

    TestSpec spec;

    spec.bufferOffset       = bufferOffset;
    spec.bufferStride       = bufferStrideBase + bufferStridePadding;
    spec.positionAttrOffset = positionAttrOffset;
    spec.colorAttrOffset    = colorAttrOffset;
    spec.hasColorAttr       = hasColorAttr;

    if (flags & FLAG_ATTRIB_UNALIGNED)
        DE_ASSERT(!deIsAligned32(spec.bufferOffset + spec.positionAttrOffset, datumSize));
    else if (flags & FLAG_ATTRIB_ALIGNED)
        DE_ASSERT(deIsAligned32(spec.bufferOffset + spec.positionAttrOffset, datumSize));

    if (flags & FLAG_BUF_UNALIGNED_STRIDE)
        DE_ASSERT(!deIsAligned32(spec.bufferStride, datumSize));
    else
        DE_ASSERT(deIsAligned32(spec.bufferStride, datumSize));

    return spec;
}

std::string SingleBindingCase::genTestDescription(int flags)
{
    std::ostringstream buf;
    buf << "draw test pattern";

    if (flags & FLAG_ATTRIB_UNALIGNED)
        buf << ", attribute offset (unaligned)";
    if (flags & FLAG_ATTRIB_ALIGNED)
        buf << ", attribute offset (aligned)";

    if (flags & FLAG_ATTRIBS_MULTIPLE_ELEMS)
        buf << ", 2 attributes";
    if (flags & FLAG_ATTRIBS_SHARED_ELEMS)
        buf << ", 2 attributes (some components shared)";

    if (flags & FLAG_BUF_ALIGNED_OFFSET)
        buf << ", buffer offset aligned";
    if (flags & FLAG_BUF_UNALIGNED_OFFSET)
        buf << ", buffer offset unaligned";
    if (flags & FLAG_BUF_UNALIGNED_STRIDE)
        buf << ", buffer stride unaligned";

    return buf.str();
}

bool SingleBindingCase::isDataUnaligned(int flags)
{
    if (flags & FLAG_ATTRIB_UNALIGNED)
        return true;
    if (flags & FLAG_ATTRIB_ALIGNED)
        return false;

    return (flags & FLAG_BUF_UNALIGNED_OFFSET) || (flags & FLAG_BUF_UNALIGNED_STRIDE);
}

void SingleBindingCase::createBuffers(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();
    std::vector<uint8_t> dataBuf(m_spec.bufferOffset + m_spec.bufferStride * GRID_SIZE * GRID_SIZE * 6);

    // In interleaved mode color rg and position zw are the same. Select "good" values for r and g
    const tcu::Vec4 colorA(0.0f, 1.0f, 0.0f, 1.0f);
    const tcu::Vec4 colorB(0.5f, 1.0f, 0.0f, 1.0f);

    for (int y = 0; y < GRID_SIZE; ++y)
        for (int x = 0; x < GRID_SIZE; ++x)
        {
            const tcu::Vec4 &color       = ((x + y) % 2 == 0) ? (colorA) : (colorB);
            const tcu::Vec4 positions[6] = {
                tcu::Vec4(float(x + 0) / float(GRID_SIZE) * 2.0f - 1.0f, float(y + 0) / float(GRID_SIZE) * 2.0f - 1.0f,
                          0.0f, 1.0f),
                tcu::Vec4(float(x + 0) / float(GRID_SIZE) * 2.0f - 1.0f, float(y + 1) / float(GRID_SIZE) * 2.0f - 1.0f,
                          0.0f, 1.0f),
                tcu::Vec4(float(x + 1) / float(GRID_SIZE) * 2.0f - 1.0f, float(y + 1) / float(GRID_SIZE) * 2.0f - 1.0f,
                          0.0f, 1.0f),
                tcu::Vec4(float(x + 0) / float(GRID_SIZE) * 2.0f - 1.0f, float(y + 0) / float(GRID_SIZE) * 2.0f - 1.0f,
                          0.0f, 1.0f),
                tcu::Vec4(float(x + 1) / float(GRID_SIZE) * 2.0f - 1.0f, float(y + 1) / float(GRID_SIZE) * 2.0f - 1.0f,
                          0.0f, 1.0f),
                tcu::Vec4(float(x + 1) / float(GRID_SIZE) * 2.0f - 1.0f, float(y + 0) / float(GRID_SIZE) * 2.0f - 1.0f,
                          0.0f, 1.0f),
            };

            // copy cell vertices to the buffer.
            for (int v = 0; v < 6; ++v)
                memcpy(&dataBuf[m_spec.bufferOffset + m_spec.positionAttrOffset +
                                m_spec.bufferStride * ((y * GRID_SIZE + x) * 6 + v)],
                       positions[v].getPtr(), sizeof(positions[v]));

            // copy color to buffer
            if (m_spec.hasColorAttr)
                for (int v = 0; v < 6; ++v)
                    memcpy(&dataBuf[m_spec.bufferOffset + m_spec.colorAttrOffset +
                                    m_spec.bufferStride * ((y * GRID_SIZE + x) * 6 + v)],
                           color.getPtr(), sizeof(color));
        }

    gl.genBuffers(1, &m_buf);
    gl.bindBuffer(GL_ARRAY_BUFFER, m_buf);
    gl.bufferData(GL_ARRAY_BUFFER, (glw::GLsizeiptr)dataBuf.size(), &dataBuf[0], GL_STATIC_DRAW);
    gl.bindBuffer(GL_ARRAY_BUFFER, 0);

    if (gl.getError() != GL_NO_ERROR)
        throw tcu::TestError("could not init buffer");
}

void SingleBindingCase::createShader(void)
{
    m_program = new glu::ShaderProgram(m_context.getRenderContext(), glu::ProgramSources()
                                                                         << glu::VertexSource(genVertexSource())
                                                                         << glu::FragmentSource(s_colorFragmentShader));
    m_testCtx.getLog() << *m_program;

    if (!m_program->isOk())
        throw tcu::TestError("could not build shader");
}

std::string SingleBindingCase::genVertexSource(void)
{
    const bool useUniformColor = !m_spec.hasColorAttr;
    std::ostringstream buf;

    buf << "#version 310 es\n"
           "in highp vec4 a_position;\n";

    if (!useUniformColor)
        buf << "in highp vec4 a_color;\n";
    else
        buf << "uniform highp vec4 u_color;\n";

    buf << "out highp vec4 v_color;\n"
           "void main (void)\n"
           "{\n"
           "    gl_Position = a_position;\n"
           "    v_color = "
        << ((useUniformColor) ? ("u_color") : ("a_color"))
        << ";\n"
           "}\n";

    return buf.str();
}

class BindVertexBufferCase : public TestCase
{
public:
    BindVertexBufferCase(Context &ctx, const char *name, const char *desc, int offset, int drawCount);
    ~BindVertexBufferCase(void);

    void init(void);
    void deinit(void);
    IterateResult iterate(void);

private:
    const int m_offset;
    const int m_drawCount;
    uint32_t m_buffer;
    glu::ShaderProgram *m_program;
};

BindVertexBufferCase::BindVertexBufferCase(Context &ctx, const char *name, const char *desc, int offset, int drawCount)
    : TestCase(ctx, name, desc)
    , m_offset(offset)
    , m_drawCount(drawCount)
    , m_buffer(0)
    , m_program(nullptr)
{
}

BindVertexBufferCase::~BindVertexBufferCase(void)
{
    deinit();
}

void BindVertexBufferCase::init(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();
    std::vector<tcu::Vec4> data(m_drawCount); // !< some junk data to make sure buffer is really allocated

    gl.genBuffers(1, &m_buffer);
    gl.bindBuffer(GL_ARRAY_BUFFER, m_buffer);
    gl.bufferData(GL_ARRAY_BUFFER, int(m_drawCount * sizeof(tcu::Vec4)), &data[0], GL_STATIC_DRAW);
    GLU_EXPECT_NO_ERROR(gl.getError(), "buffer gen");

    m_program = new glu::ShaderProgram(m_context.getRenderContext(), glu::ProgramSources()
                                                                         << glu::VertexSource(s_vertexSource)
                                                                         << glu::FragmentSource(s_fragmentSource));
    if (!m_program->isOk())
    {
        m_testCtx.getLog() << *m_program;
        throw tcu::TestError("could not build program");
    }
}

void BindVertexBufferCase::deinit(void)
{
    if (m_buffer)
    {
        m_context.getRenderContext().getFunctions().deleteBuffers(1, &m_buffer);
        m_buffer = 0;
    }

    delete m_program;
    m_program = nullptr;
}

BindVertexBufferCase::IterateResult BindVertexBufferCase::iterate(void)
{
    glu::CallLogWrapper gl(m_context.getRenderContext().getFunctions(), m_testCtx.getLog());
    const int32_t positionLoc = gl.glGetAttribLocation(m_program->getProgram(), "a_position");
    tcu::Surface dst(m_context.getRenderTarget().getWidth(), m_context.getRenderTarget().getHeight());
    glu::VertexArray vao(m_context.getRenderContext());

    gl.enableLogging(true);

    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    gl.glClear(GL_COLOR_BUFFER_BIT);
    GLU_EXPECT_NO_ERROR(gl.glGetError(), "setup");

    gl.glUseProgram(m_program->getProgram());
    GLU_EXPECT_NO_ERROR(gl.glGetError(), "use program");

    gl.glBindVertexArray(*vao);
    gl.glEnableVertexAttribArray(positionLoc);
    gl.glVertexAttribFormat(positionLoc, 4, GL_FLOAT, GL_FALSE, 0);
    gl.glVertexAttribBinding(positionLoc, 0);
    gl.glBindVertexBuffer(0, m_buffer, m_offset, int(sizeof(tcu::Vec4)));
    GLU_EXPECT_NO_ERROR(gl.glGetError(), "set buffer");

    gl.glDrawArrays(GL_POINTS, 0, m_drawCount);

    // allow errors after attempted out-of-bounds memory access
    {
        const uint32_t error = gl.glGetError();

        if (error != GL_NO_ERROR)
            m_testCtx.getLog() << tcu::TestLog::Message << "Got error: " << glu::getErrorStr(error) << ", ignoring..."
                               << tcu::TestLog::EndMessage;
    }

    // read pixels to wait for rendering
    gl.glFinish();
    glu::readPixels(m_context.getRenderContext(), 0, 0, dst.getAccess());

    m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
    return STOP;
}

} // namespace

VertexAttributeBindingTests::VertexAttributeBindingTests(Context &context)
    : TestCaseGroup(context, "vertex_attribute_binding", "Test vertex attribute binding stress tests")
{
}

VertexAttributeBindingTests::~VertexAttributeBindingTests(void)
{
}

void VertexAttributeBindingTests::init(void)
{
    tcu::TestCaseGroup *const unalignedGroup = new tcu::TestCaseGroup(m_testCtx, "unaligned", "Unaligned access");
    tcu::TestCaseGroup *const bufferRangeGroup =
        new tcu::TestCaseGroup(m_testCtx, "buffer_bounds", "Source data over buffer bounds");

    addChild(unalignedGroup);
    addChild(bufferRangeGroup);

    // .unaligned
    {
        unalignedGroup->addChild(
            new SingleBindingCase(m_context, "elements_1_unaligned", SingleBindingCase::FLAG_ATTRIB_UNALIGNED));
        unalignedGroup->addChild(new SingleBindingCase(m_context, "offset_elements_1_unaligned",
                                                       SingleBindingCase::FLAG_BUF_ALIGNED_OFFSET |
                                                           SingleBindingCase::FLAG_ATTRIB_UNALIGNED));

        unalignedGroup->addChild(new SingleBindingCase(m_context, "unaligned_offset_elements_1",
                                                       SingleBindingCase::FLAG_BUF_UNALIGNED_OFFSET | 0));
        unalignedGroup->addChild(new SingleBindingCase(m_context, "unaligned_offset_elements_1_unaligned",
                                                       SingleBindingCase::FLAG_BUF_UNALIGNED_OFFSET |
                                                           SingleBindingCase::FLAG_ATTRIB_UNALIGNED));
        unalignedGroup->addChild(new SingleBindingCase(m_context, "unaligned_offset_elements_2",
                                                       SingleBindingCase::FLAG_BUF_UNALIGNED_OFFSET |
                                                           SingleBindingCase::FLAG_ATTRIBS_MULTIPLE_ELEMS));
        unalignedGroup->addChild(new SingleBindingCase(m_context, "unaligned_offset_elements_2_share_elements",
                                                       SingleBindingCase::FLAG_BUF_UNALIGNED_OFFSET |
                                                           SingleBindingCase::FLAG_ATTRIBS_SHARED_ELEMS));

        unalignedGroup->addChild(new SingleBindingCase(m_context, "unaligned_stride_elements_1",
                                                       SingleBindingCase::FLAG_BUF_UNALIGNED_STRIDE | 0));
        unalignedGroup->addChild(new SingleBindingCase(m_context, "unaligned_stride_elements_2",
                                                       SingleBindingCase::FLAG_BUF_UNALIGNED_STRIDE |
                                                           SingleBindingCase::FLAG_ATTRIBS_MULTIPLE_ELEMS));
        unalignedGroup->addChild(new SingleBindingCase(m_context, "unaligned_stride_elements_2_share_elements",
                                                       SingleBindingCase::FLAG_BUF_UNALIGNED_STRIDE |
                                                           SingleBindingCase::FLAG_ATTRIBS_SHARED_ELEMS));
    }

    // .buffer_bounds
    {
        // bind buffer offset cases
        bufferRangeGroup->addChild(new BindVertexBufferCase(m_context, "bind_vertex_buffer_offset_over_bounds_10",
                                                            "Offset over buffer bounds", 0x00210000, 10));
        bufferRangeGroup->addChild(new BindVertexBufferCase(m_context, "bind_vertex_buffer_offset_over_bounds_1000",
                                                            "Offset over buffer bounds", 0x00210000, 1000));
        bufferRangeGroup->addChild(new BindVertexBufferCase(m_context, "bind_vertex_buffer_offset_near_wrap_10",
                                                            "Offset over buffer bounds, near wrapping", 0x7FFFFFF0,
                                                            10));
        bufferRangeGroup->addChild(new BindVertexBufferCase(m_context, "bind_vertex_buffer_offset_near_wrap_1000",
                                                            "Offset over buffer bounds, near wrapping", 0x7FFFFFF0,
                                                            1000));
    }
}

} // namespace Stress
} // namespace gles31
} // namespace deqp