/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES 3.1 Module
 * -------------------------------------------------
 *
 * Copyright 2017 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 FBO sRGB tests.
*//*--------------------------------------------------------------------*/

#include "es31fFboSRGBWriteControlTests.hpp"
#include "es31fFboTestUtil.hpp"
#include "gluTextureUtil.hpp"
#include "gluContextInfo.hpp"
#include "tcuTestLog.hpp"
#include "glwEnums.hpp"
#include "sglrContextUtil.hpp"
#include "glwFunctions.hpp"
#include "deUniquePtr.hpp"
#include "deSharedPtr.hpp"
#include "gluObjectWrapper.hpp"
#include "gluPixelTransfer.hpp"
#include "glsTextureTestUtil.hpp"
#include "tcuVectorUtil.hpp"
#include "gluStrUtil.hpp"

namespace deqp
{
namespace gles31
{
namespace Functional
{
namespace
{

tcu::Vec4 getTestColorLinear(void)
{
    return tcu::Vec4(0.2f, 0.3f, 0.4f, 1.0f);
}

tcu::Vec4 getTestColorSRGB(void)
{
    return linearToSRGB(tcu::Vec4(0.2f, 0.3f, 0.4f, 1.0f));
}

tcu::Vec4 getTestColorBlank(void)
{
    return tcu::Vec4(0.0f, 0.0f, 0.0f, 1.0f);
}

tcu::Vec4 getEpsilonError(void)
{
    return tcu::Vec4(0.005f);
}

enum QueryType
{
    QUERYTYPE_ISENABLED = 0,
    QUERYTYPE_BOOLEAN,
    QUERYTYPE_FLOAT,
    QUERYTYPE_INT,
    QUERYTYPE_INT64,
    QUERYTYPE_LAST
};

enum DataType
{
    DATATYPE_BOOLEAN = 0,
    DATATYPE_FLOAT,
    DATATYPE_INT,
    DATATYPE_INT64,
};

enum FramebufferSRGB
{
    FRAMEBUFFERSRGB_ENABLED = 0,
    FRAMEBUFFERSRGB_DISABLED
};

enum FramebufferBlend
{
    FRAMEBUFFERBLEND_ENABLED = 0,
    FRAMEBUFFERBLEND_DISABLED
};

enum TextureSourcesType
{
    TEXTURESOURCESTYPE_RGBA = 0,
    TEXTURESOURCESTYPE_SRGBA,
    TEXTURESOURCESTYPE_BOTH,
    TEXTURESOURCESTYPE_NONE
};

enum FboType
{
    FBOTYPE_SOURCE = 0,
    FBOTYPE_DESTINATION
};

enum RendererTask
{
    RENDERERTASK_DRAW = 0,
    RENDERERTASK_COPY
};

enum SamplingType
{
    SAMPLINGTYPE_TEXTURE = 0,
    SAMPLINGTYPE_TEXTURE_LOD,
    SAMPLINGTYPE_TEXTURE_GRAD,
    SAMPLINGTYPE_TEXTURE_OFFSET,
    SAMPLINGTYPE_TEXTURE_PROJ,
};

namespace TestTextureSizes
{
const int WIDTH  = 128;
const int HEIGHT = 128;
} // namespace TestTextureSizes

namespace SampligTypeCount
{
const int MAX = 5;
} // namespace SampligTypeCount

std::string buildSamplingPassType(const int samplerTotal)
{
    std::ostringstream shaderFragment;

    const SamplingType samplingTypeList[] = {SAMPLINGTYPE_TEXTURE, SAMPLINGTYPE_TEXTURE_LOD, SAMPLINGTYPE_TEXTURE_GRAD,
                                             SAMPLINGTYPE_TEXTURE_OFFSET, SAMPLINGTYPE_TEXTURE_PROJ};

    for (int samplerTypeIdx = 0; samplerTypeIdx < DE_LENGTH_OF_ARRAY(samplingTypeList); samplerTypeIdx++)
    {
        shaderFragment << "    if (uFunctionType == " << samplerTypeIdx << ") \n"
                       << "    { \n";

        for (int samplerIdx = 0; samplerIdx < samplerTotal; samplerIdx++)
        {
            switch (static_cast<SamplingType>(samplerTypeIdx))
            {
            case SAMPLINGTYPE_TEXTURE:
            {
                shaderFragment << "        texelColor" << samplerIdx << " = texture(uTexture" << samplerIdx
                               << ", vs_aTexCoord); \n";
                break;
            }
            case SAMPLINGTYPE_TEXTURE_LOD:
            {
                shaderFragment << "        texelColor" << samplerIdx << " = textureLod(uTexture" << samplerIdx
                               << ", vs_aTexCoord, 0.0f); \n";
                break;
            }
            case SAMPLINGTYPE_TEXTURE_GRAD:
            {
                shaderFragment << "        texelColor" << samplerIdx << " = textureGrad(uTexture" << samplerIdx
                               << ", vs_aTexCoord, vec2(0.0f, 0.0f), vec2(0.0f, 0.0f)); \n";
                break;
            }
            case SAMPLINGTYPE_TEXTURE_OFFSET:
            {
                shaderFragment << "        texelColor" << samplerIdx << " = textureOffset(uTexture" << samplerIdx
                               << ", vs_aTexCoord, ivec2(0.0f, 0.0f)); \n";
                break;
            }
            case SAMPLINGTYPE_TEXTURE_PROJ:
            {
                shaderFragment << "        texelColor" << samplerIdx << " = textureProj(uTexture" << samplerIdx
                               << ", vec3(vs_aTexCoord, 1.0f)); \n";
                break;
            }
            default:
                DE_FATAL("Error: sampling type unrecognised");
            }
        }

        shaderFragment << "    } \n";
    }

    return shaderFragment.str();
}

void logColor(Context &context, const std::string &colorLogMessage, const tcu::Vec4 resultColor)
{
    tcu::TestLog &log = context.getTestContext().getLog();
    std::ostringstream message;

    message << colorLogMessage << " = (" << resultColor.x() << ", " << resultColor.y() << ", " << resultColor.z()
            << ", " << resultColor.w() << ")";
    log << tcu::TestLog::Message << message.str() << tcu::TestLog::EndMessage;
}

struct TestFunction
{
    explicit TestFunction(const bool hasFunctionValue) : hasFunction(hasFunctionValue)
    {
    }
    TestFunction(const char *const functionNameValue, const char *const functionDefinition)
        : hasFunction(true)
        , functionName(functionNameValue)
        , functionDefintion(functionDefinition)
    {
    }
    ~TestFunction(void)
    {
    }

    bool hasFunction;
    const char *functionName;
    const char *functionDefintion;
};

TestFunction getFunctionBlendLinearToSRGBCheck(void)
{
    const char *const functionName = "blendPlusLinearToSRGB";

    const char *const functionDefinition =
        "mediump vec4 blendPlusLinearToSRGB(in mediump vec4 colorSrc, in mediump vec4 colorDst) \n"
        "{ \n"
        "    const int MAX_VECTOR_SIZE = 4; \n"
        "    mediump vec4 colorConverted; \n"
        "    mediump vec4 colorBlended; \n"
        "    for (int idx = 0; idx < MAX_VECTOR_SIZE; idx++) \n"
        "    { \n"
        "        if (uBlendFunctionType == 0) \n"
        "        { \n"
        "            colorBlended[idx] = (colorSrc[idx] * uFactorSrc) + colorDst[idx] * uFactorDst; \n"
        "        } \n"
        "        if (uBlendFunctionType == 1) \n"
        "        { \n"
        "            colorBlended[idx] = (colorSrc[idx] * uFactorSrc) - (colorDst[idx] * uFactorDst); \n"
        "        } \n"
        "if (uBlendFunctionType == 2) \n"
        "        { \n"
        "            colorBlended[idx] = (colorDst[idx] * uFactorDst) - (colorSrc[idx] * uFactorSrc); \n"
        "        } \n"
        "        if (colorBlended[idx] < 0.0031308f) \n"
        "        { \n"
        "            colorConverted[idx] = 12.92f * colorBlended[idx]; \n"
        "        } \n"
        "        else \n"
        "        { \n"
        "            colorConverted[idx] = 1.055f * pow(colorBlended[idx], 0.41666f) - 0.055f; \n"
        "        } \n"
        "    } \n"
        "    return colorConverted; \n"
        "} \n";

    TestFunction testFunction(functionName, functionDefinition);

    return testFunction;
}

struct FBOConfig
{
    FBOConfig(const uint32_t textureInternalFormatValue, const tcu::Vec4 textureColorValue,
              const uint32_t fboTargetTypeValue, const uint32_t fboColorAttachmentValue, const FboType fboTypeValue)
        : textureInternalFormat(textureInternalFormatValue)
        , textureColor(textureColorValue)
        , fboTargetType(fboTargetTypeValue)
        , fboColorAttachment(fboColorAttachmentValue)
        , fboType(fboTypeValue)
    {
    }
    ~FBOConfig(void)
    {
    }

    uint32_t textureInternalFormat;
    tcu::Vec4 textureColor;
    uint32_t fboTargetType;
    uint32_t fboColorAttachment;
    FboType fboType;
};

struct BlendConfig
{
    uint32_t equation;
    uint32_t funcSrc;
    uint32_t funcDst;
};

std::vector<BlendConfig> getBlendingConfigList(void)
{
    BlendConfig blendConfigs[12];

    // add function permutations
    blendConfigs[0].equation = GL_FUNC_ADD;
    blendConfigs[1].equation = GL_FUNC_ADD;
    blendConfigs[2].equation = GL_FUNC_ADD;
    blendConfigs[3].equation = GL_FUNC_ADD;

    blendConfigs[0].funcSrc = GL_ONE;
    blendConfigs[0].funcDst = GL_ONE;
    blendConfigs[1].funcSrc = GL_ONE;
    blendConfigs[1].funcDst = GL_ZERO;
    blendConfigs[2].funcSrc = GL_ZERO;
    blendConfigs[2].funcDst = GL_ONE;
    blendConfigs[3].funcSrc = GL_ZERO;
    blendConfigs[3].funcDst = GL_ZERO;

    // subtract function permutations
    blendConfigs[4].equation = GL_FUNC_SUBTRACT;
    blendConfigs[5].equation = GL_FUNC_SUBTRACT;
    blendConfigs[6].equation = GL_FUNC_SUBTRACT;
    blendConfigs[7].equation = GL_FUNC_SUBTRACT;

    blendConfigs[4].funcSrc = GL_ONE;
    blendConfigs[4].funcDst = GL_ONE;
    blendConfigs[5].funcSrc = GL_ONE;
    blendConfigs[5].funcDst = GL_ZERO;
    blendConfigs[6].funcSrc = GL_ZERO;
    blendConfigs[6].funcDst = GL_ONE;
    blendConfigs[7].funcSrc = GL_ZERO;
    blendConfigs[7].funcDst = GL_ZERO;

    // reverse subtract function permutations
    blendConfigs[8].equation  = GL_FUNC_REVERSE_SUBTRACT;
    blendConfigs[9].equation  = GL_FUNC_REVERSE_SUBTRACT;
    blendConfigs[10].equation = GL_FUNC_REVERSE_SUBTRACT;
    blendConfigs[11].equation = GL_FUNC_REVERSE_SUBTRACT;

    blendConfigs[8].funcSrc  = GL_ONE;
    blendConfigs[8].funcDst  = GL_ONE;
    blendConfigs[9].funcSrc  = GL_ONE;
    blendConfigs[9].funcDst  = GL_ZERO;
    blendConfigs[10].funcSrc = GL_ZERO;
    blendConfigs[10].funcDst = GL_ONE;
    blendConfigs[11].funcSrc = GL_ZERO;
    blendConfigs[11].funcDst = GL_ZERO;

    std::vector<BlendConfig> configList(blendConfigs, blendConfigs + DE_LENGTH_OF_ARRAY(blendConfigs));

    return configList;
}

struct TestRenderPassConfig
{
    TestRenderPassConfig(void) : testFunction(false)
    {
    }

    TestRenderPassConfig(const TextureSourcesType textureSourcesTypeValue, FBOConfig fboConfigListValue,
                         const FramebufferSRGB framebufferSRGBValue, const FramebufferBlend framebufferBendValue,
                         const RendererTask rendererTaskValue)
        : textureSourcesType(textureSourcesTypeValue)
        , framebufferSRGB(framebufferSRGBValue)
        , frameBufferBlend(framebufferBendValue)
        , testFunction(false)
        , rendererTask(rendererTaskValue)
    {
        fboConfigList.push_back(fboConfigListValue);
    }

    TestRenderPassConfig(const TextureSourcesType textureSourcesTypeValue, FBOConfig fboConfigListValue,
                         const FramebufferSRGB framebufferSRGBValue, const FramebufferBlend framebufferBendValue,
                         TestFunction testFunctionValue, const RendererTask rendererTaskValue)
        : textureSourcesType(textureSourcesTypeValue)
        , framebufferSRGB(framebufferSRGBValue)
        , frameBufferBlend(framebufferBendValue)
        , testFunction(testFunctionValue)
        , rendererTask(rendererTaskValue)
    {
        fboConfigList.push_back(fboConfigListValue);
    }

    TestRenderPassConfig(const TextureSourcesType textureSourcesTypeValue, std::vector<FBOConfig> fboConfigListValue,
                         const FramebufferSRGB framebufferSRGBValue, const FramebufferBlend framebufferBendValue,
                         TestFunction testFunctionValue, const RendererTask rendererTaskValue)
        : textureSourcesType(textureSourcesTypeValue)
        , fboConfigList(fboConfigListValue)
        , framebufferSRGB(framebufferSRGBValue)
        , frameBufferBlend(framebufferBendValue)
        , testFunction(testFunctionValue)
        , rendererTask(rendererTaskValue)
    {
    }

    ~TestRenderPassConfig(void)
    {
    }

    TextureSourcesType textureSourcesType;
    std::vector<FBOConfig> fboConfigList;
    FramebufferSRGB framebufferSRGB;
    FramebufferBlend frameBufferBlend;
    TestFunction testFunction;
    RendererTask rendererTask;
};

class TestVertexData
{
public:
    TestVertexData(Context &context);
    ~TestVertexData(void);

    void init(void);

    void bind(void) const;
    void unbind(void) const;

private:
    const glw::Functions *m_gl;
    std::vector<float> m_data;
    glw::GLuint m_vboHandle;
    glw::GLuint m_vaoHandle;
};

TestVertexData::TestVertexData(Context &context) : m_gl(&context.getRenderContext().getFunctions())
{
    const glw::GLfloat vertexData[] = {
        // position                // texcoord
        -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom left corner
        1.0f,  -1.0f, 0.0f, 1.0f, 0.0f, // bottom right corner
        1.0f,  1.0f,  0.0f, 1.0f, 1.0f, // Top right corner

        -1.0f, 1.0f,  0.0f, 0.0f, 1.0f, // top left corner
        1.0f,  1.0f,  0.0f, 1.0f, 1.0f, // Top right corner
        -1.0f, -1.0f, 0.0f, 0.0f, 0.0f  // bottom left corner
    };

    m_data.resize(DE_LENGTH_OF_ARRAY(vertexData));
    for (int idx = 0; idx < (int)m_data.size(); idx++)
        m_data[idx] = vertexData[idx];

    m_gl->genVertexArrays(1, &m_vaoHandle);
    m_gl->bindVertexArray(m_vaoHandle);

    m_gl->genBuffers(1, &m_vboHandle);
    m_gl->bindBuffer(GL_ARRAY_BUFFER, m_vboHandle);

    m_gl->bufferData(GL_ARRAY_BUFFER, (glw::GLsizei)(m_data.size() * sizeof(glw::GLfloat)), &m_data[0], GL_STATIC_DRAW);

    m_gl->enableVertexAttribArray(0);
    m_gl->vertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * (glw::GLsizei)sizeof(float), (glw::GLvoid *)0);
    m_gl->enableVertexAttribArray(1);
    m_gl->vertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * (glw::GLsizei)sizeof(float),
                              (glw::GLvoid *)(3 * sizeof(float)));

    m_gl->bindVertexArray(0);
    m_gl->bindBuffer(GL_ARRAY_BUFFER, 0);
    GLU_EXPECT_NO_ERROR(m_gl->getError(), "gl error during vertex data setup");
}

TestVertexData::~TestVertexData(void)
{
    m_gl->deleteBuffers(1, &m_vboHandle);
    m_gl->deleteVertexArrays(1, &m_vaoHandle);
}

void TestVertexData::bind(void) const
{
    m_gl->bindVertexArray(m_vaoHandle);
}

void TestVertexData::unbind(void) const
{
    m_gl->bindVertexArray(0);
}

class TestTexture2D
{
public:
    TestTexture2D(Context &context, const uint32_t internalFormatValue, const uint32_t transferFormatValue,
                  const uint32_t transferTypeValue, const tcu::Vec4 imageColorValue);
    ~TestTexture2D(void);

    int getTextureUnit(void) const;
    uint32_t getHandle(void) const;

    void bind(const int textureUnit);
    void unbind(void) const;

private:
    const glw::Functions *m_gl;
    glw::GLuint m_handle;
    const uint32_t m_internalFormat;
    tcu::TextureFormat m_transferFormat;
    int m_width;
    int m_height;
    tcu::TextureLevel m_imageData;
    int m_textureUnit;
};

TestTexture2D::TestTexture2D(Context &context, const uint32_t internalFormat, const uint32_t transferFormat,
                             const uint32_t transferType, const tcu::Vec4 imageColor)
    : m_gl(&context.getRenderContext().getFunctions())
    , m_internalFormat(internalFormat)
    , m_transferFormat(tcu::TextureFormat(glu::mapGLTransferFormat(transferFormat, transferType)))
    , m_width(TestTextureSizes::WIDTH)
    , m_height(TestTextureSizes::HEIGHT)
    , m_imageData(tcu::TextureLevel(glu::mapGLInternalFormat(internalFormat), m_width, m_height, 1))
{
    // fill image data with a solid test color
    tcu::clear(m_imageData.getAccess(), tcu::Vec4(0.0f));
    for (int py = 0; py < m_imageData.getHeight(); py++)
    {
        for (int px = 0; px < m_imageData.getWidth(); px++)
            m_imageData.getAccess().setPixel(imageColor, px, py);
    }

    m_gl->genTextures(1, &m_handle);

    m_gl->bindTexture(GL_TEXTURE_2D, m_handle);
    m_gl->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
    m_gl->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
    m_gl->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    m_gl->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    m_gl->texImage2D(GL_TEXTURE_2D, 0, m_internalFormat, m_width, m_height, 0, transferFormat, transferType,
                     m_imageData.getAccess().getDataPtr());

    m_gl->bindTexture(GL_TEXTURE_2D, 0);
}

TestTexture2D::~TestTexture2D(void)
{
    m_gl->deleteTextures(1, &m_handle);
}

int TestTexture2D::getTextureUnit(void) const
{
    return m_textureUnit;
}

uint32_t TestTexture2D::getHandle(void) const
{
    return m_handle;
}

void TestTexture2D::bind(const int textureUnit)
{
    m_textureUnit = textureUnit;
    m_gl->activeTexture(GL_TEXTURE0 + m_textureUnit);
    m_gl->bindTexture(GL_TEXTURE_2D, m_handle);
}

void TestTexture2D::unbind(void) const
{
    m_gl->bindTexture(GL_TEXTURE_2D, 0);
}

class TestFramebuffer
{
public:
    TestFramebuffer(void);
    TestFramebuffer(Context &context, const uint32_t targetType, const uint32_t colorAttachment,
                    glw::GLuint textureAttachmentHandle, const bool isSRGB, const FboType fboType, const int idx);
    ~TestFramebuffer(void);

    void setTargetType(const uint32_t targetType);

    FboType getType(void) const;
    uint32_t getColorAttachment(void) const;
    int getIdx(void) const;

    void bind(void);
    void unbind(void);

    typedef de::UniquePtr<glu::Framebuffer> fboUniquePtr;

private:
    const glw::Functions *m_gl;
    fboUniquePtr m_referenceSource;
    uint32_t m_targetType;
    bool m_bound;
    bool m_isSRGB;
    FboType m_type;
    const int m_idx;
    uint32_t m_colorAttachment;
};

TestFramebuffer::TestFramebuffer(Context &context, const uint32_t targetType, const uint32_t colorAttachment,
                                 glw::GLuint textureAttachmentHandle, const bool isSRGB, const FboType fboType,
                                 const int idx)
    : m_gl(&context.getRenderContext().getFunctions())
    , m_referenceSource(new glu::Framebuffer(context.getRenderContext()))
    , m_targetType(targetType)
    , m_bound(false)
    , m_isSRGB(isSRGB)
    , m_type(fboType)
    , m_idx(idx)
    , m_colorAttachment(colorAttachment)
{
    m_gl->bindFramebuffer(m_targetType, **m_referenceSource);

    m_gl->framebufferTexture2D(m_targetType, m_colorAttachment, GL_TEXTURE_2D, textureAttachmentHandle, 0);

    TCU_CHECK(m_gl->checkFramebufferStatus(m_targetType) == GL_FRAMEBUFFER_COMPLETE);

    if (targetType == GL_DRAW_BUFFER)
    {
        glw::GLuint textureAttachments[] = {m_colorAttachment};
        m_gl->drawBuffers(DE_LENGTH_OF_ARRAY(textureAttachments), textureAttachments);
        GLU_EXPECT_NO_ERROR(m_gl->getError(), "glDrawBuffer()");
    }

    if (targetType == GL_READ_BUFFER)
    {
        m_gl->readBuffer(m_colorAttachment);
        GLU_EXPECT_NO_ERROR(m_gl->getError(), "glReadBuffer()");
    }

    m_gl->bindFramebuffer(m_targetType, 0);
}

TestFramebuffer::~TestFramebuffer(void)
{
}

void TestFramebuffer::setTargetType(const uint32_t targetType)
{
    m_targetType = targetType;
}

FboType TestFramebuffer::getType(void) const
{
    return m_type;
}

uint32_t TestFramebuffer::getColorAttachment(void) const
{
    return m_colorAttachment;
}

int TestFramebuffer::getIdx(void) const
{
    return m_idx;
}

void TestFramebuffer::bind(void)
{
    if (!m_bound)
    {
        m_gl->bindFramebuffer(m_targetType, **m_referenceSource);
        m_bound = true;
    }
}

void TestFramebuffer::unbind(void)
{
    if (m_bound)
    {
        m_gl->bindFramebuffer(m_targetType, 0);
        m_bound = false;
    }
}

class TestShaderProgram
{
public:
    TestShaderProgram(Context &context, const int samplerTotal, TestFunction testFunction);
    ~TestShaderProgram(void);

    glw::GLuint getHandle(void) const;

    void use(void) const;
    void unuse(void) const;

    glu::ShaderProgramInfo getLogInfo(void);

private:
    const glw::Functions *m_gl;
    de::MovePtr<glu::ShaderProgram> m_referenceSource;
    const int m_samplerTotal;
    const int m_shaderStagesTotal;
};

TestShaderProgram::TestShaderProgram(Context &context, const int samplerTotal, TestFunction testFunction)
    : m_gl(&context.getRenderContext().getFunctions())
    , m_samplerTotal(samplerTotal)
    , m_shaderStagesTotal(2)
{
    std::ostringstream shaderFragment;

    const char *const shaderVertex = "#version 310 es \n"
                                     "layout (location = 0) in mediump vec3 aPosition; \n"
                                     "layout (location = 1) in mediump vec2 aTexCoord; \n"
                                     "out mediump vec2 vs_aTexCoord; \n"
                                     "void main () \n"
                                     "{ \n"
                                     "    gl_Position = vec4(aPosition, 1.0f); \n"
                                     "    vs_aTexCoord = aTexCoord; \n"
                                     "} \n";

    shaderFragment << "#version 310 es \n"
                   << "in mediump vec2 vs_aTexCoord; \n"
                   << "layout (location = 0) out mediump vec4 fs_aColor0; \n";

    for (int samplerIdx = 0; samplerIdx < m_samplerTotal; samplerIdx++)
        shaderFragment << "uniform sampler2D uTexture" << samplerIdx << "; \n";

    shaderFragment << "uniform int uFunctionType; \n";

    if (testFunction.hasFunction)
        shaderFragment << "uniform int uBlendFunctionType; \n"
                       << "uniform mediump float uFactorSrc; \n"
                       << "uniform mediump float uFactorDst; \n"
                       << testFunction.functionDefintion;

    shaderFragment << "void main () \n"
                   << "{ \n";

    for (int samplerIdx = 0; samplerIdx < m_samplerTotal; samplerIdx++)
        shaderFragment << "    mediump vec4 texelColor" << samplerIdx << " = vec4(0.0f, 0.0f, 0.0f, 1.0f); \n";

    shaderFragment << buildSamplingPassType(m_samplerTotal);

    if (testFunction.hasFunction)
        shaderFragment << "    fs_aColor0 = " << testFunction.functionName << "(texelColor0, texelColor1); \n";
    else
        shaderFragment << "    fs_aColor0 = texelColor0; \n";

    shaderFragment << "} \n";

    m_referenceSource = de::MovePtr<glu::ShaderProgram>(new glu::ShaderProgram(
        context.getRenderContext(), glu::makeVtxFragSources(shaderVertex, shaderFragment.str())));
    if (!m_referenceSource->isOk())
    {
        tcu::TestLog &log = context.getTestContext().getLog();
        log << this->getLogInfo();
        TCU_FAIL("Failed to compile shaders and link program");
    }
}

TestShaderProgram::~TestShaderProgram(void)
{
    m_referenceSource = de::MovePtr<glu::ShaderProgram>(DE_NULL);
    m_referenceSource.clear();
}

uint32_t TestShaderProgram::getHandle(void) const
{
    return m_referenceSource->getProgram();
}

void TestShaderProgram::use(void) const
{
    m_gl->useProgram(this->getHandle());
}

void TestShaderProgram::unuse(void) const
{
    m_gl->useProgram(0);
}

glu::ShaderProgramInfo TestShaderProgram::getLogInfo(void)
{
    glu::ShaderProgramInfo buildInfo;

    // log shader program info. Only vertex and fragment shaders included
    buildInfo.program = m_referenceSource->getProgramInfo();
    for (int shaderIdx = 0; shaderIdx < m_shaderStagesTotal; shaderIdx++)
    {
        glu::ShaderInfo shaderInfo = m_referenceSource->getShaderInfo(
            static_cast<glu::ShaderType>(static_cast<int>(glu::SHADERTYPE_VERTEX) + static_cast<int>(shaderIdx)), 0);
        buildInfo.shaders.push_back(shaderInfo);
    }
    return buildInfo;
}

class Renderer
{
public:
    Renderer(Context &context);
    ~Renderer(void);

    void init(const TestRenderPassConfig &renderPassConfig, const int renderpass);
    void deinit(void);

    void setSamplingType(const SamplingType samplerIdx);
    void setBlendIteration(const int blendIteration);
    void setFramebufferBlend(const bool blend);
    void setFramebufferSRGB(const bool sRGB);

    std::vector<tcu::Vec4> getResultsPreDraw(void) const;
    std::vector<tcu::Vec4> getResultsPostDraw(void) const;
    int getBlendConfigCount(void) const;
    glu::ShaderProgramInfo getShaderProgramInfo(void);

    void copyFrameBufferTexture(const int srcPx, const int srcPy, const int dstPx, const int dstPy);
    void draw(void);
    void storeShaderProgramInfo(void);
    void logShaderProgramInfo(void);

    typedef de::SharedPtr<TestTexture2D> TextureSp;
    typedef de::SharedPtr<TestFramebuffer> FboSp;

private:
    void createFBOwithColorAttachment(const std::vector<FBOConfig> fboConfigList);
    void setShaderProgramSamplingType(const int samplerIdx);
    void setShaderBlendFunctionType(void);
    void setShaderBlendSrcDstValues(void);
    void bindActiveTexturesSamplers(void);
    void bindAllRequiredSourceTextures(const TextureSourcesType texturesRequired);
    void unbindAllSourceTextures(void);
    void bindFramebuffer(const int framebufferIdx);
    void unbindFramebuffer(const int framebufferIdx);
    void enableFramebufferSRGB(void);
    void enableFramebufferBlend(void);
    bool isFramebufferAttachmentSRGB(const uint32_t targetType, const uint32_t attachment) const;
    void readTexels(const int px, const int py, const uint32_t attachment, tcu::Vec4 &texelData);
    void logState(const uint32_t targetType, const uint32_t attachment, const SamplingType samplingType) const;

    // renderer specific constants initialized during constructor
    Context &m_context;
    const TestVertexData m_vertexData;
    const int m_textureSourceTotal;

    // additional resources monitored by the renderer
    std::vector<BlendConfig> m_blendConfigList;
    std::vector<TextureSp> m_textureSourceList;
    TestRenderPassConfig m_renderPassConfig;
    std::vector<TextureSp> m_fboTextureList;
    TestShaderProgram *m_shaderProgram;
    std::vector<FboSp> m_framebufferList;
    std::vector<tcu::Vec4> m_resultsListPreDraw;
    std::vector<tcu::Vec4> m_resultsListPostDraw;

    // mutable state variables (internal access only)
    bool m_hasShaderProgramInfo;
    int m_renderPass;
    int m_samplersRequired;
    bool m_hasFunction;
    bool m_blittingEnabled;
    glu::ShaderProgramInfo m_shaderProgramInfo;

    // mutable state variables (external access via setters)
    SamplingType m_samplingType;
    int m_blendIteration;
    bool m_framebufferBlendEnabled;
    bool m_framebufferSRGBEnabled;
};

Renderer::Renderer(Context &context)
    : m_context(context)
    , m_vertexData(context)
    , m_textureSourceTotal(2)
    , m_blendConfigList(getBlendingConfigList())
    , m_hasShaderProgramInfo(false)
{
    TextureSp textureLinear(new TestTexture2D(m_context, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, getTestColorLinear()));
    m_textureSourceList.push_back(textureLinear);

    TextureSp textureSRGB(
        new TestTexture2D(m_context, GL_SRGB8_ALPHA8, GL_RGBA, GL_UNSIGNED_BYTE, getTestColorLinear()));
    m_textureSourceList.push_back(textureSRGB);
}

Renderer::~Renderer(void)
{
    m_textureSourceList.clear();
    this->deinit();
}

void Renderer::init(const TestRenderPassConfig &renderPassConfig, const int renderpass)
{
    m_renderPassConfig = renderPassConfig;
    m_renderPass       = renderpass;

    this->createFBOwithColorAttachment(m_renderPassConfig.fboConfigList);

    if (m_renderPassConfig.textureSourcesType != TEXTURESOURCESTYPE_NONE)
    {
        if (m_renderPassConfig.textureSourcesType == TEXTURESOURCESTYPE_RGBA ||
            m_renderPassConfig.textureSourcesType == TEXTURESOURCESTYPE_SRGBA)
            m_samplersRequired = 1;
        else if (m_renderPassConfig.textureSourcesType == TEXTURESOURCESTYPE_BOTH)
            m_samplersRequired = 2;
        else
            DE_FATAL("Error: Texture source required not recognised");

        m_shaderProgram = new TestShaderProgram(m_context, m_samplersRequired, m_renderPassConfig.testFunction);
        m_hasFunction   = m_renderPassConfig.testFunction.hasFunction;
    }
    else
        m_shaderProgram = DE_NULL;
}

void Renderer::deinit(void)
{
    if (m_shaderProgram != DE_NULL)
    {
        delete m_shaderProgram;
        m_shaderProgram = DE_NULL;
    }

    m_fboTextureList.clear();
    m_framebufferList.clear();
}

void Renderer::setSamplingType(const SamplingType samplingType)
{
    m_samplingType = samplingType;
}

void Renderer::setBlendIteration(const int blendIteration)
{
    m_blendIteration = blendIteration;
}

void Renderer::setFramebufferBlend(const bool blend)
{
    m_framebufferBlendEnabled = blend;
}

void Renderer::setFramebufferSRGB(const bool sRGB)
{
    m_framebufferSRGBEnabled = sRGB;
}

std::vector<tcu::Vec4> Renderer::getResultsPreDraw(void) const
{
    return m_resultsListPreDraw;
}

std::vector<tcu::Vec4> Renderer::getResultsPostDraw(void) const
{
    return m_resultsListPostDraw;
}

int Renderer::getBlendConfigCount(void) const
{
    return (int)m_blendConfigList.size();
}

void Renderer::copyFrameBufferTexture(const int srcPx, const int srcPy, const int dstPx, const int dstPy)
{
    const glw::Functions &gl     = m_context.getRenderContext().getFunctions();
    int fboSrcIdx                = -1;
    int fboDstIdx                = -1;
    uint32_t fboSrcColAttachment = GL_NONE;
    uint32_t fboDstColAttachment = GL_NONE;

    for (int idx = 0; idx < (int)m_framebufferList.size(); idx++)
        this->bindFramebuffer(idx);

    // cache fbo attachments and idx locations
    for (int idx = 0; idx < (int)m_framebufferList.size(); idx++)
    {
        if (m_framebufferList[idx]->getType() == FBOTYPE_SOURCE)
        {
            fboSrcIdx           = m_framebufferList[idx]->getIdx();
            fboSrcColAttachment = m_framebufferList[fboSrcIdx]->getColorAttachment();
        }
        if (m_framebufferList[idx]->getType() == FBOTYPE_DESTINATION)
        {
            fboDstIdx           = m_framebufferList[idx]->getIdx();
            fboDstColAttachment = m_framebufferList[fboDstIdx]->getColorAttachment();
        }
    }

    for (int idx = 0; idx < (int)m_framebufferList.size(); idx++)
        m_framebufferList[idx]->unbind();

    // store texel data from both src and dst before performing the copy
    m_resultsListPreDraw.resize(2);
    m_framebufferList[fboSrcIdx]->bind();
    this->readTexels(0, 0, fboSrcColAttachment, m_resultsListPreDraw[0]);
    m_framebufferList[fboSrcIdx]->unbind();
    m_framebufferList[fboDstIdx]->setTargetType(GL_READ_FRAMEBUFFER);
    m_framebufferList[fboDstIdx]->bind();
    this->readTexels(0, 0, fboDstColAttachment, m_resultsListPreDraw[1]);
    m_framebufferList[fboDstIdx]->unbind();
    m_framebufferList[fboDstIdx]->setTargetType(GL_DRAW_FRAMEBUFFER);

    m_framebufferList[fboSrcIdx]->bind();
    m_framebufferList[fboDstIdx]->bind();

    this->enableFramebufferSRGB();
    this->enableFramebufferBlend();

    gl.blitFramebuffer(srcPx, srcPy, TestTextureSizes::WIDTH, TestTextureSizes::HEIGHT, dstPx, dstPy,
                       TestTextureSizes::WIDTH, TestTextureSizes::HEIGHT, GL_COLOR_BUFFER_BIT, GL_NEAREST);

    m_resultsListPostDraw.resize(2);
    this->readTexels(0, 0, fboSrcColAttachment, m_resultsListPostDraw[0]);
    m_framebufferList[fboSrcIdx]->unbind();
    m_framebufferList[fboDstIdx]->unbind();

    m_framebufferList[fboDstIdx]->setTargetType(GL_READ_FRAMEBUFFER);
    m_framebufferList[fboDstIdx]->bind();
    this->readTexels(0, 0, fboDstColAttachment, m_resultsListPostDraw[1]);
    m_framebufferList[fboDstIdx]->unbind();
}

void Renderer::draw(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();

    if (m_renderPassConfig.textureSourcesType == TEXTURESOURCESTYPE_NONE)
        DE_FATAL("Error: Attempted to draw with no texture sources");

    // resize results storage with each render pass
    m_resultsListPreDraw.resize(m_renderPass + 1);
    m_resultsListPostDraw.resize(m_renderPass + 1);

    m_shaderProgram->use();
    m_vertexData.bind();

    for (int idx = 0; idx < (int)m_framebufferList.size(); idx++)
        this->bindFramebuffer(idx);

    this->bindAllRequiredSourceTextures(m_renderPassConfig.textureSourcesType);
    this->bindActiveTexturesSamplers();

    this->enableFramebufferSRGB();
    this->enableFramebufferBlend();

    this->readTexels(0, 0, GL_COLOR_ATTACHMENT0, m_resultsListPreDraw[m_renderPass]);
    this->setShaderProgramSamplingType(m_samplingType);
    if (m_hasFunction)
    {
        this->setShaderBlendFunctionType();
        this->setShaderBlendSrcDstValues();
    }

    gl.drawArrays(GL_TRIANGLES, 0, 6);

    this->readTexels(0, 0, GL_COLOR_ATTACHMENT0, m_resultsListPostDraw[m_renderPass]);
    this->logState(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_samplingType);

    this->unbindAllSourceTextures();
    for (int idx = 0; idx < (int)m_framebufferList.size(); idx++)
        this->unbindFramebuffer(idx);
    m_vertexData.unbind();
    m_shaderProgram->unuse();
}

void Renderer::storeShaderProgramInfo(void)
{
    m_shaderProgramInfo    = m_shaderProgram->getLogInfo();
    m_hasShaderProgramInfo = true;
}

void Renderer::logShaderProgramInfo(void)
{
    tcu::TestLog &log = m_context.getTestContext().getLog();

    if (m_hasShaderProgramInfo)
        log << m_shaderProgramInfo;
}

void Renderer::createFBOwithColorAttachment(const std::vector<FBOConfig> fboConfigList)
{
    const int size = (int)fboConfigList.size();
    for (int idx = 0; idx < size; idx++)
    {
        TextureSp texture(new TestTexture2D(m_context, fboConfigList[idx].textureInternalFormat, GL_RGBA,
                                            GL_UNSIGNED_BYTE, fboConfigList[idx].textureColor));
        m_fboTextureList.push_back(texture);

        bool isSRGB;
        if (fboConfigList[idx].textureInternalFormat == GL_SRGB8_ALPHA8)
            isSRGB = true;
        else
            isSRGB = false;

        FboSp framebuffer(new TestFramebuffer(m_context, fboConfigList[idx].fboTargetType,
                                              fboConfigList[idx].fboColorAttachment, texture->getHandle(), isSRGB,
                                              fboConfigList[idx].fboType, idx));
        m_framebufferList.push_back(framebuffer);
    }
}

void Renderer::setShaderProgramSamplingType(const int samplerIdx)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();

    glw::GLuint location = gl.getUniformLocation(m_shaderProgram->getHandle(), "uFunctionType");
    DE_ASSERT(location != (glw::GLuint)-1);
    gl.uniform1i(location, samplerIdx);
}

void Renderer::setShaderBlendFunctionType(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();

    int function = -1;
    if (m_blendConfigList[m_blendIteration].equation == GL_FUNC_ADD)
        function = 0;
    else if (m_blendConfigList[m_blendIteration].equation == GL_FUNC_SUBTRACT)
        function = 1;
    else if (m_blendConfigList[m_blendIteration].equation == GL_FUNC_REVERSE_SUBTRACT)
        function = 2;
    else
        DE_FATAL("Error: Blend function not recognised");

    glw::GLuint location = gl.getUniformLocation(m_shaderProgram->getHandle(), "uBlendFunctionType");
    DE_ASSERT(location != (glw::GLuint)-1);
    gl.uniform1i(location, function);
}

void Renderer::setShaderBlendSrcDstValues(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();

    float funcSrc;
    if (m_blendConfigList[m_blendIteration].funcSrc == GL_ONE)
        funcSrc = 1.0f;
    else
        funcSrc = 0.0f;

    float funcDst;
    if (m_blendConfigList[m_blendIteration].funcDst == GL_ONE)
        funcDst = 1.0f;
    else
        funcDst = 0.0f;

    glw::GLuint locationSrc = gl.getUniformLocation(m_shaderProgram->getHandle(), "uFactorSrc");
    gl.uniform1f(locationSrc, funcSrc);
    GLU_EXPECT_NO_ERROR(gl.getError(), "glUniform1f()");

    glw::GLuint locationDst = gl.getUniformLocation(m_shaderProgram->getHandle(), "uFactorDst");
    gl.uniform1f(locationDst, funcDst);
    GLU_EXPECT_NO_ERROR(gl.getError(), "glUniform1f()");
}

void Renderer::bindActiveTexturesSamplers(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();

    for (int idx = 0; idx < m_samplersRequired; idx++)
    {
        std::ostringstream stream;
        stream << "uTexture" << idx;
        std::string uniformName(stream.str());
        glw::GLint location = gl.getUniformLocation(m_shaderProgram->getHandle(), uniformName.c_str());
        DE_ASSERT(location != -1);
        gl.uniform1i(location, m_textureSourceList[idx]->getTextureUnit());
        GLU_EXPECT_NO_ERROR(gl.getError(), "glGetUniformLocation()");
    }
}

void Renderer::bindAllRequiredSourceTextures(const TextureSourcesType texturesRequired)
{
    if (texturesRequired == TEXTURESOURCESTYPE_RGBA)
        m_textureSourceList[0]->bind(0);
    else if (texturesRequired == TEXTURESOURCESTYPE_SRGBA)
        m_textureSourceList[1]->bind(0);
    else if (texturesRequired == TEXTURESOURCESTYPE_BOTH)
    {
        m_textureSourceList[0]->bind(0);
        m_textureSourceList[1]->bind(1);
    }
    else
        DE_FATAL("Error: Invalid sources requested in bind all");
}

void Renderer::unbindAllSourceTextures(void)
{
    for (int idx = 0; idx < (int)m_textureSourceList.size(); idx++)
        m_textureSourceList[idx]->unbind();
}

void Renderer::bindFramebuffer(const int framebufferIdx)
{
    m_framebufferList[framebufferIdx]->bind();
}

void Renderer::unbindFramebuffer(const int framebufferIdx)
{
    m_framebufferList[framebufferIdx]->unbind();
}

void Renderer::enableFramebufferSRGB(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();

    if (m_framebufferSRGBEnabled)
        gl.enable(GL_FRAMEBUFFER_SRGB);
    else
        gl.disable(GL_FRAMEBUFFER_SRGB);
}

void Renderer::enableFramebufferBlend(void)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();
    tcu::TestLog &log        = m_context.getTestContext().getLog();
    std::ostringstream message;

    message << "Blend settings = ";

    if (m_framebufferBlendEnabled)
    {
        gl.enable(GL_BLEND);
        gl.blendEquation(m_blendConfigList[m_blendIteration].equation);
        gl.blendFunc(m_blendConfigList[m_blendIteration].funcSrc, m_blendConfigList[m_blendIteration].funcDst);

        std::string equation, src, dst;
        if (m_blendConfigList[m_blendIteration].equation == GL_FUNC_ADD)
            equation = "GL_FUNC_ADD";
        if (m_blendConfigList[m_blendIteration].equation == GL_FUNC_SUBTRACT)
            equation = "GL_FUNC_SUBTRACT";
        if (m_blendConfigList[m_blendIteration].equation == GL_FUNC_REVERSE_SUBTRACT)
            equation = "GL_FUNC_REVERSE_SUBTRACT";
        if (m_blendConfigList[m_blendIteration].funcSrc == GL_ONE)
            src = "GL_ONE";
        else
            src = "GL_ZERO";
        if (m_blendConfigList[m_blendIteration].funcDst == GL_ONE)
            dst = "GL_ONE";
        else
            dst = "GL_ZERO";

        message << "Enabled: equation = " << equation << ", func src = " << src << ", func dst = " << dst;
    }
    else
    {
        gl.disable(GL_BLEND);
        message << "Disabled";
    }

    log << tcu::TestLog::Message << message.str() << tcu::TestLog::EndMessage;
}

bool Renderer::isFramebufferAttachmentSRGB(const uint32_t targetType, const uint32_t attachment) const
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();
    glw::GLint encodingType;

    gl.getFramebufferAttachmentParameteriv(targetType, attachment, GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING,
                                           &encodingType);
    GLU_EXPECT_NO_ERROR(gl.getError(), "glGetNamedFramebufferAttachmentParameteriv()");

    switch (static_cast<glw::GLenum>(encodingType))
    {
    case GL_SRGB:
    {
        return true;
    }
    case GL_LINEAR:
    {
        return false;
    }
    default:
    {
        DE_FATAL("Error: Color attachment format not recognised");
        return false;
    }
    }
}

void Renderer::readTexels(const int px, const int py, const uint32_t mode, tcu::Vec4 &texelData)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();
    tcu::TextureLevel textureRead;

    // ensure result sampling coordinates are within range of the result color attachment
    DE_ASSERT((px >= 0) && (px < m_context.getRenderTarget().getWidth()));
    DE_ASSERT((py >= 0) && (py < m_context.getRenderTarget().getHeight()));

    gl.readBuffer(mode);
    textureRead.setStorage(glu::mapGLTransferFormat(GL_RGBA, GL_UNSIGNED_BYTE), TestTextureSizes::WIDTH,
                           TestTextureSizes::HEIGHT);
    glu::readPixels(m_context.getRenderContext(), px, py, textureRead.getAccess());
    GLU_EXPECT_NO_ERROR(gl.getError(), "glReadPixels()");
    texelData = textureRead.getAccess().getPixel(px, py);
}

void Renderer::logState(const uint32_t targetType, const uint32_t attachment, const SamplingType samplingType) const
{
    tcu::TestLog &log = m_context.getTestContext().getLog();
    std::ostringstream message;

    bool fboAttachmentSRGB = this->isFramebufferAttachmentSRGB(targetType, attachment);
    message.str("");
    message << "getFramebufferAttachmentParameteriv() check = ";
    if (fboAttachmentSRGB)
        message << "GL_SRGB";
    else
        message << "GL_LINEAR";
    log << tcu::TestLog::Message << message.str() << tcu::TestLog::EndMessage;

    message.str("");
    message << "Framebuffer color attachment value BEFORE draw call";
    logColor(m_context, message.str(), m_resultsListPreDraw[m_renderPass]);

    message.str("");
    message << "Framebuffer color attachment value AFTER draw call";
    logColor(m_context, message.str(), m_resultsListPostDraw[m_renderPass]);

    message.str("");
    message << "Sampling type = ";
    std::string type;
    if (samplingType == 0)
        type = "texture()";
    else if (samplingType == 1)
        type = "textureLOD()";
    else if (samplingType == 2)
        type = "textureGrad()";
    else if (samplingType == 3)
        type = "textureOffset()";
    else if (samplingType == 4)
        type = "textureProj()";
    else
        DE_FATAL("Error: Sampling type unregonised");
    message << type;
    log << tcu::TestLog::Message << message.str() << tcu::TestLog::EndMessage;

    message.str("");
    if (m_framebufferSRGBEnabled)
        message << "Framebuffer SRGB = enabled";
    else
        message << "Framebuffer SRGB = disabled";
    log << tcu::TestLog::Message << message.str() << tcu::TestLog::EndMessage;
}

class FboSRGBTestCase : public TestCase
{
public:
    FboSRGBTestCase(Context &context, const char *const name, const char *const desc);
    ~FboSRGBTestCase(void);

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

    void setTestConfig(std::vector<TestRenderPassConfig> renderPassConfigList);

    virtual void setupTest(void)    = 0;
    virtual bool verifyResult(void) = 0;

protected:
    bool m_hasTestConfig;
    std::vector<TestRenderPassConfig> m_renderPassConfigList;
    bool m_testcaseRequiresBlend;
    std::vector<tcu::Vec4> m_resultsPreDraw;
    std::vector<tcu::Vec4> m_resultsPostDraw;

private:
    FboSRGBTestCase(const FboSRGBTestCase &);
    FboSRGBTestCase &operator=(const FboSRGBTestCase &);
};

FboSRGBTestCase::FboSRGBTestCase(Context &context, const char *const name, const char *const desc)
    : TestCase(context, name, desc)
    , m_hasTestConfig(false)
    , m_testcaseRequiresBlend(false)
{
}

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

void FboSRGBTestCase::init(void)
{
    if (glu::isContextTypeES(m_context.getRenderContext().getType()))
    {
        // extensions requirements for test
        if (!glu::contextSupports(m_context.getRenderContext().getType(), glu::ApiType::es(3, 2)))
            TCU_THROW(NotSupportedError, "Test requires a context version equal or higher than 3.2");

        if (!m_context.getContextInfo().isExtensionSupported("GL_EXT_sRGB_write_control"))
            TCU_THROW(NotSupportedError, "Test requires extension GL_EXT_sRGB_write_control");

        if (!m_context.getContextInfo().isExtensionSupported("GL_EXT_texture_sRGB_decode"))
            TCU_THROW(NotSupportedError, "Test requires GL_EXT_texture_sRGB_decode extension");
    }
}

void FboSRGBTestCase::deinit(void)
{
}

FboSRGBTestCase::IterateResult FboSRGBTestCase::iterate(void)
{
    this->setupTest();

    DE_ASSERT(m_hasTestConfig && "Error: Renderer was not supplied a test config");

    Renderer renderer(m_context);

    // loop through each sampling type
    for (int samplingIdx = 0; samplingIdx < SampligTypeCount::MAX; samplingIdx++)
    {
        renderer.setSamplingType(static_cast<SamplingType>(samplingIdx));

        // loop through each blend configuration
        const int blendCount = renderer.getBlendConfigCount();
        for (int blendIdx = 0; blendIdx < blendCount; blendIdx++)
        {
            // loop through each render pass
            const int renderPassCount = (int)m_renderPassConfigList.size();
            for (int renderPassIdx = 0; renderPassIdx < renderPassCount; renderPassIdx++)
            {
                TestRenderPassConfig renderPassConfig = m_renderPassConfigList[renderPassIdx];

                renderer.init(renderPassConfig, renderPassIdx);

                if (blendIdx == 0 && renderPassConfig.rendererTask == RENDERERTASK_DRAW)
                    renderer.storeShaderProgramInfo();

                if (renderPassConfig.frameBufferBlend == FRAMEBUFFERBLEND_ENABLED)
                {
                    renderer.setBlendIteration(blendIdx);
                    renderer.setFramebufferBlend(true);
                }
                else
                    renderer.setFramebufferBlend(false);

                if (renderPassConfig.framebufferSRGB == FRAMEBUFFERSRGB_ENABLED)
                    renderer.setFramebufferSRGB(true);
                else
                    renderer.setFramebufferSRGB(false);

                if (renderPassConfig.rendererTask == RENDERERTASK_DRAW)
                    renderer.draw();
                else if (renderPassConfig.rendererTask == RENDERERTASK_COPY)
                    renderer.copyFrameBufferTexture(0, 0, 0, 0);
                else
                    DE_FATAL("Error: render task not recognised");

                renderer.deinit();

            } // render passes

            m_resultsPreDraw  = renderer.getResultsPreDraw();
            m_resultsPostDraw = renderer.getResultsPostDraw();

            bool testPassed = this->verifyResult();
            if (testPassed)
                m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
            else
            {
                m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Result verification failed");
                renderer.logShaderProgramInfo();
                return STOP;
            }

            if (!m_testcaseRequiresBlend)
                break;
        } // blend configs

        renderer.logShaderProgramInfo();
    } // sampling types

    return STOP;
}

void FboSRGBTestCase::setTestConfig(std::vector<TestRenderPassConfig> renderPassConfigList)
{
    m_renderPassConfigList = renderPassConfigList;
    m_hasTestConfig        = true;

    for (int idx = 0; idx < (int)renderPassConfigList.size(); idx++)
    {
        if (renderPassConfigList[idx].frameBufferBlend == FRAMEBUFFERBLEND_ENABLED)
        {
            m_testcaseRequiresBlend = true;
            return;
        }
    }
    m_testcaseRequiresBlend = false;
}

class FboSRGBQueryCase : public TestCase
{
public:
    FboSRGBQueryCase(Context &context, const char *const name, const char *const description);
    ~FboSRGBQueryCase(void);

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

FboSRGBQueryCase::FboSRGBQueryCase(Context &context, const char *const name, const char *const description)
    : TestCase(context, name, description)
{
}

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

void FboSRGBQueryCase::init(void)
{
    // extension requirements for test
    if (!m_context.getContextInfo().isExtensionSupported("GL_EXT_sRGB_write_control"))
        TCU_THROW(NotSupportedError, "Test requires extension GL_EXT_sRGB_write_control");
}

void FboSRGBQueryCase::deinit(void)
{
}

FboSRGBQueryCase::IterateResult FboSRGBQueryCase::iterate(void)
{
    // TEST INFO:
    // API tests which check when querying FRAMEBUFFER_SRGB_EXT capability returns the correct information when using glEnabled() or glDisabled()

    const glw::Functions &gl  = m_context.getRenderContext().getFunctions();
    tcu::TestLog &log         = m_context.getTestContext().getLog();
    const char *const msgPart = ", after disabling = ";

    for (int idx = 0; idx < static_cast<int>(QUERYTYPE_LAST); idx++)
    {
        std::ostringstream message;
        bool pass = false;

        message << std::string("Results: After Enabling = ");

        gl.enable(GL_FRAMEBUFFER_SRGB);

        switch (static_cast<QueryType>(idx))
        {
        case QUERYTYPE_ISENABLED:
        {
            glw::GLboolean enabled[2];
            enabled[0] = gl.isEnabled(GL_FRAMEBUFFER_SRGB);
            gl.disable(GL_FRAMEBUFFER_SRGB);
            enabled[1] = gl.isEnabled(GL_FRAMEBUFFER_SRGB);

            message << static_cast<float>(enabled[0]) << msgPart << static_cast<float>(enabled[1]);
            pass = (enabled[0] && !(enabled[1])) ? true : false;
            break;
        }
        case QUERYTYPE_BOOLEAN:
        {
            glw::GLboolean enabled[2];
            gl.getBooleanv(GL_FRAMEBUFFER_SRGB, &enabled[0]);
            gl.disable(GL_FRAMEBUFFER_SRGB);
            gl.getBooleanv(GL_FRAMEBUFFER_SRGB, &enabled[1]);

            message << static_cast<float>(enabled[0]) << msgPart << static_cast<float>(enabled[1]);
            pass = (enabled[0] && !(enabled[1])) ? true : false;
            break;
        }
        case QUERYTYPE_FLOAT:
        {
            glw::GLfloat enabled[2];
            gl.getFloatv(GL_FRAMEBUFFER_SRGB, &enabled[0]);
            gl.disable(GL_FRAMEBUFFER_SRGB);
            gl.getFloatv(GL_FRAMEBUFFER_SRGB, &enabled[1]);

            message << static_cast<float>(enabled[0]) << msgPart << static_cast<float>(enabled[1]);
            pass = ((int)enabled[0] && !((int)enabled[1])) ? true : false;
            break;
        }
        case QUERYTYPE_INT:
        {
            glw::GLint enabled[2];
            gl.getIntegerv(GL_FRAMEBUFFER_SRGB, &enabled[0]);
            gl.disable(GL_FRAMEBUFFER_SRGB);
            gl.getIntegerv(GL_FRAMEBUFFER_SRGB, &enabled[1]);

            message << static_cast<float>(enabled[0]) << msgPart << static_cast<float>(enabled[1]);
            pass = (enabled[0] && !(enabled[1])) ? true : false;
            break;
        }
        case QUERYTYPE_INT64:
        {
            glw::GLint64 enabled[2];
            gl.getInteger64v(GL_FRAMEBUFFER_SRGB, &enabled[0]);
            gl.disable(GL_FRAMEBUFFER_SRGB);
            gl.getInteger64v(GL_FRAMEBUFFER_SRGB, &enabled[1]);

            message << static_cast<float>(enabled[0]) << msgPart << static_cast<float>(enabled[1]);
            pass = (enabled[0] && !(enabled[1])) ? true : false;
            break;
        }
        default:
            DE_FATAL("Error: Datatype not recognised");
        }

        log << tcu::TestLog::Message << message.str() << tcu::TestLog::EndMessage;

        if (pass)
            m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
        else
        {
            m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Result verification failed");
            return STOP;
        }
    }
    return STOP;
}

class FboSRGBColAttachCase : public FboSRGBTestCase
{
public:
    FboSRGBColAttachCase(Context &context, const char *const name, const char *const description)
        : FboSRGBTestCase(context, name, description)
    {
    }
    ~FboSRGBColAttachCase(void)
    {
    }

    void setupTest(void);
    bool verifyResult(void);
};

void FboSRGBColAttachCase::setupTest(void)
{
    // TEST INFO:
    // Check if FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING  set to SRGB and FRAMEBUFFER_SRGB_EXT enabled, destination colors are converted from SRGB to linear
    // before and after blending, finally the result is converted back to SRGB for storage

    // NOTE:
    // if fbo pre-draw color set to linaer, color values get linearlized "twice"
    // (0.2f, 0.3f, 0.4f, 1.0f) when sampled i.e. converted in shader = (0.0331048f, 0.073239f, 0.132868f)
    // resulting in the follolwing blending equation (0.2f, 0.3f, 0.4f 1.0f) + (0.0331048, 0.073239, 0.132868) = (0.521569f, 0.647059f, 0.756863f, 1.0f)

    FBOConfig fboConfig0 =
        FBOConfig(GL_SRGB8_ALPHA8, getTestColorLinear(), GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBOTYPE_SOURCE);
    FBOConfig fboConfig1 =
        FBOConfig(GL_RGBA8, getTestColorLinear(), GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBOTYPE_SOURCE);

    const TestRenderPassConfig renderPassConfigs[] = {
        TestRenderPassConfig(TEXTURESOURCESTYPE_RGBA, fboConfig0, FRAMEBUFFERSRGB_ENABLED, FRAMEBUFFERBLEND_ENABLED,
                             RENDERERTASK_DRAW),
        TestRenderPassConfig(TEXTURESOURCESTYPE_BOTH, fboConfig1, FRAMEBUFFERSRGB_DISABLED, FRAMEBUFFERBLEND_DISABLED,
                             getFunctionBlendLinearToSRGBCheck(), RENDERERTASK_DRAW)};
    std::vector<TestRenderPassConfig> renderPassConfigList(renderPassConfigs,
                                                           renderPassConfigs + DE_LENGTH_OF_ARRAY(renderPassConfigs));

    this->setTestConfig(renderPassConfigList);
}

bool FboSRGBColAttachCase::verifyResult(void)
{
    if (tcu::boolAll(tcu::lessThan(tcu::abs(m_resultsPostDraw[0] - m_resultsPostDraw[1]), getEpsilonError())) ||
        tcu::boolAll(tcu::equal(m_resultsPostDraw[0], m_resultsPostDraw[1])))
        return true;
    else
        return false;
}

class FboSRGBToggleBlendCase : public FboSRGBTestCase
{
public:
    FboSRGBToggleBlendCase(Context &context, const char *const name, const char *const description)
        : FboSRGBTestCase(context, name, description)
    {
    }
    ~FboSRGBToggleBlendCase(void)
    {
    }

    void setupTest(void);
    bool verifyResult(void);
};

void FboSRGBToggleBlendCase::setupTest(void)
{
    //    TEST INFO:
    //    Test to check if changing FRAMEBUFFER_SRGB_EXT from enabled to disabled. Enabled should produce SRGB color whilst disabled
    //    should produce linear color. Test conducted with blending disabled.

    FBOConfig fboConfig0 =
        FBOConfig(GL_SRGB8_ALPHA8, getTestColorLinear(), GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBOTYPE_DESTINATION);

    const TestRenderPassConfig renderPassConfigs[] = {
        TestRenderPassConfig(TEXTURESOURCESTYPE_RGBA, fboConfig0, FRAMEBUFFERSRGB_ENABLED, FRAMEBUFFERBLEND_DISABLED,
                             TestFunction(false), RENDERERTASK_DRAW),
        TestRenderPassConfig(TEXTURESOURCESTYPE_RGBA, fboConfig0, FRAMEBUFFERSRGB_DISABLED, FRAMEBUFFERBLEND_DISABLED,
                             TestFunction(false), RENDERERTASK_DRAW)};
    std::vector<TestRenderPassConfig> renderPassConfigList(renderPassConfigs,
                                                           renderPassConfigs + DE_LENGTH_OF_ARRAY(renderPassConfigs));

    this->setTestConfig(renderPassConfigList);
}

bool FboSRGBToggleBlendCase::verifyResult(void)
{
    if (tcu::boolAny(tcu::greaterThan(tcu::abs(m_resultsPostDraw[0] - m_resultsPostDraw[1]), getEpsilonError())))
        return true;
    else
        return false;
}

class FboSRGBRenderTargetIgnoreCase : public FboSRGBTestCase
{
public:
    FboSRGBRenderTargetIgnoreCase(Context &context, const char *const name, const char *const description)
        : FboSRGBTestCase(context, name, description)
    {
    }
    ~FboSRGBRenderTargetIgnoreCase(void)
    {
    }

    void setupTest(void);
    bool verifyResult(void);
};

void FboSRGBRenderTargetIgnoreCase::setupTest(void)
{
    // TEST INFO:
    // Check if render targets that are non-RGB ignore the state of GL_FRAMEBUFFER_SRGB_EXT. Rendering to an fbo with non-sRGB color
    // attachment should ignore color space conversion, producing linear color.

    FBOConfig fboConfig0 =
        FBOConfig(GL_RGBA8, getTestColorBlank(), GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBOTYPE_DESTINATION);

    const TestRenderPassConfig renderPassConfigs[] = {
        TestRenderPassConfig(TEXTURESOURCESTYPE_RGBA, fboConfig0, FRAMEBUFFERSRGB_ENABLED, FRAMEBUFFERBLEND_DISABLED,
                             TestFunction(false), RENDERERTASK_DRAW)

    };
    std::vector<TestRenderPassConfig> renderPassConfigList(renderPassConfigs,
                                                           renderPassConfigs + DE_LENGTH_OF_ARRAY(renderPassConfigs));

    this->setTestConfig(renderPassConfigList);
}

bool FboSRGBRenderTargetIgnoreCase::verifyResult(void)
{
    if (tcu::boolAll(tcu::lessThan(tcu::abs(m_resultsPostDraw[0] - getTestColorLinear()), getEpsilonError())) ||
        tcu::boolAll(tcu::equal(m_resultsPostDraw[0], getTestColorLinear())))
        return true;
    else
        return false;
}

class FboSRGBCopyToLinearCase : public FboSRGBTestCase
{
public:
    FboSRGBCopyToLinearCase(Context &context, const char *const name, const char *const description)
        : FboSRGBTestCase(context, name, description)
    {
    }
    ~FboSRGBCopyToLinearCase(void)
    {
    }

    void setupTest(void);
    bool verifyResult(void);
};

void FboSRGBCopyToLinearCase::setupTest(void)
{
    // TEST INFO:
    // Check if copying from an fbo with an sRGB color attachment to an fbo with a linear color attachment with FRAMEBUFFER_EXT enabled results in
    // an sRGB to linear conversion

    FBOConfig fboConfigs[] = {
        FBOConfig(GL_SRGB8_ALPHA8, getTestColorSRGB(), GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBOTYPE_SOURCE),
        FBOConfig(GL_RGBA8, getTestColorBlank(), GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, FBOTYPE_DESTINATION)};
    std::vector<FBOConfig> fboConfigList(fboConfigs, fboConfigs + DE_LENGTH_OF_ARRAY(fboConfigs));

    const TestRenderPassConfig renderPassConfigs[] = {
        TestRenderPassConfig(TEXTURESOURCESTYPE_NONE, fboConfigList, FRAMEBUFFERSRGB_ENABLED, FRAMEBUFFERBLEND_DISABLED,
                             TestFunction(false), RENDERERTASK_COPY)};
    std::vector<TestRenderPassConfig> renderPassConfigList(renderPassConfigs,
                                                           renderPassConfigs + DE_LENGTH_OF_ARRAY(renderPassConfigs));

    this->setTestConfig(renderPassConfigList);
}

bool FboSRGBCopyToLinearCase::verifyResult(void)
{
    logColor(m_context, "pre-copy source fbo color values", m_resultsPreDraw[0]);
    logColor(m_context, "pre-copy destination fbo color values", m_resultsPreDraw[1]);
    logColor(m_context, "post-copy source fbo color values", m_resultsPostDraw[0]);
    logColor(m_context, "post-copy destination fbo color values", m_resultsPostDraw[1]);

    if (tcu::boolAll(tcu::lessThan(tcu::abs(m_resultsPostDraw[1] - getTestColorLinear()), getEpsilonError())) ||
        tcu::boolAll(tcu::equal(m_resultsPostDraw[1], getTestColorLinear())))
        return true;
    else
        return false;
}

class FboSRGBUnsupportedEnumCase : public TestCase
{
public:
    FboSRGBUnsupportedEnumCase(Context &context, const char *const name, const char *const description);
    ~FboSRGBUnsupportedEnumCase(void);

    void init(void);
    void deinit(void);
    bool isInvalidEnum(std::string functionName);
    IterateResult iterate(void);
};

FboSRGBUnsupportedEnumCase::FboSRGBUnsupportedEnumCase(Context &context, const char *const name,
                                                       const char *const description)
    : TestCase(context, name, description)
{
}

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

void FboSRGBUnsupportedEnumCase::init(void)
{
    if (!glu::isContextTypeES(m_context.getRenderContext().getType()))
        TCU_THROW(NotSupportedError, "The test is not supported in a non-GLES context");

    // extension requirements for test
    if (m_context.getContextInfo().isExtensionSupported("GL_EXT_sRGB_write_control"))
        TCU_THROW(NotSupportedError, "Test requires extension GL_EXT_sRGB_write_control to be unsupported");
}

void FboSRGBUnsupportedEnumCase::deinit(void)
{
}

bool FboSRGBUnsupportedEnumCase::isInvalidEnum(std::string functionName)
{
    const glw::Functions &gl = m_context.getRenderContext().getFunctions();
    tcu::TestLog &log        = m_context.getTestContext().getLog();
    bool isOk                = true;
    glw::GLenum error        = GL_NO_ERROR;

    log << tcu::TestLog::Message << "Checking call to " << functionName << tcu::TestLog::EndMessage;

    error = gl.getError();

    if (error != GL_INVALID_ENUM)
    {
        log << tcu::TestLog::Message << " returned wrong value [" << glu::getErrorStr(error) << ", expected "
            << glu::getErrorStr(GL_INVALID_ENUM) << "]" << tcu::TestLog::EndMessage;
        isOk = false;
    }

    return isOk;
}

FboSRGBUnsupportedEnumCase::IterateResult FboSRGBUnsupportedEnumCase::iterate(void)
{
    // TEST INFO:
    // API tests that check calls using enum GL_FRAMEBUFFER_SRGB return GL_INVALID_ENUM  when GL_EXT_sRGB_write_control is not supported

    const glw::Functions &gl = m_context.getRenderContext().getFunctions();
    bool allPass             = true;
    glw::GLboolean bEnabled  = GL_FALSE;
    glw::GLfloat fEnabled    = 0;
    glw::GLint iEnabled      = 0;
    glw::GLint64 lEnabled    = 0;

    m_context.getTestContext().getLog() << tcu::TestLog::Message
                                        << "Check calls using enum GL_FRAMEBUFFER_SRGB return GL_INVALID_ENUM  when "
                                           "GL_EXT_sRGB_write_control is not supported\n\n"
                                        << tcu::TestLog::EndMessage;

    gl.enable(GL_FRAMEBUFFER_SRGB);
    allPass &= isInvalidEnum("glEnable()");

    gl.disable(GL_FRAMEBUFFER_SRGB);
    allPass &= isInvalidEnum("glDisable()");

    gl.isEnabled(GL_FRAMEBUFFER_SRGB);
    allPass &= isInvalidEnum("glIsEnabled()");

    gl.getBooleanv(GL_FRAMEBUFFER_SRGB, &bEnabled);
    allPass &= isInvalidEnum("glGetBooleanv()");

    gl.getFloatv(GL_FRAMEBUFFER_SRGB, &fEnabled);
    allPass &= isInvalidEnum("glGetFloatv()");

    gl.getIntegerv(GL_FRAMEBUFFER_SRGB, &iEnabled);
    allPass &= isInvalidEnum("glGetIntegerv()");

    gl.getInteger64v(GL_FRAMEBUFFER_SRGB, &lEnabled);
    allPass &= isInvalidEnum("glGetInteger64v()");

    if (allPass)
        m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
    else
        m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Fail");

    return STOP;
}

} // namespace

FboSRGBWriteControlTests::FboSRGBWriteControlTests(Context &context)
    : TestCaseGroup(context, "srgb_write_control", "Colorbuffer tests")
{
}

FboSRGBWriteControlTests::~FboSRGBWriteControlTests(void)
{
}

void FboSRGBWriteControlTests::init(void)
{
    this->addChild(new FboSRGBQueryCase(m_context, "framebuffer_srgb_enabled", "srgb enable framebuffer"));
    this->addChild(new FboSRGBColAttachCase(m_context, "framebuffer_srgb_enabled_col_attach",
                                            "srgb enable color attachment and framebuffer"));
    this->addChild(new FboSRGBToggleBlendCase(m_context, "framebuffer_srgb_enabled_blend",
                                              "toggle framebuffer srgb settings with blend disabled"));
    this->addChild(new FboSRGBRenderTargetIgnoreCase(m_context, "framebuffer_srgb_enabled_render_target_ignore",
                                                     "enable framebuffer srgb, non-srgb render target should ignore"));
    this->addChild(new FboSRGBCopyToLinearCase(m_context, "framebuffer_srgb_enabled_copy_to_linear",
                                               "no conversion when blittering between framebuffer srgb and linear"));

    // negative
    this->addChild(
        new FboSRGBUnsupportedEnumCase(m_context, "framebuffer_srgb_unsupported_enum",
                                       "check error codes for query functions when extension is not supported"));
}

} // namespace Functional
} // namespace gles31
} // namespace deqp