src/libANGLE/validationES3.cpp

//
// Copyright (c) 2013-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// validationES3.cpp: Validation functions for OpenGL ES 3.0 entry point parameters

#include "libANGLE/validationES3.h"

#include "libANGLE/validationES.h"
#include "libANGLE/Context.h"
#include "libANGLE/Texture.h"
#include "libANGLE/Framebuffer.h"
#include "libANGLE/Renderbuffer.h"
#include "libANGLE/formatutils.h"
#include "libANGLE/FramebufferAttachment.h"

#include "common/mathutil.h"
#include "common/utilities.h"

using namespace angle;

namespace gl
{

static bool ValidateTexImageFormatCombination(gl::Context *context, GLenum internalFormat, GLenum format, GLenum type)
{
    // For historical reasons, glTexImage2D and glTexImage3D pass in their internal format as a
    // GLint instead of a GLenum. Therefor an invalid internal format gives a GL_INVALID_VALUE
    // error instead of a GL_INVALID_ENUM error. As this validation function is only called in
    // the validation codepaths for glTexImage2D/3D, we record a GL_INVALID_VALUE error.
    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(internalFormat);
    if (!formatInfo.textureSupport(context->getClientMajorVersion(), context->getExtensions()))
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    // The type and format are valid if any supported internal format has that type and format
    if (!ValidES3Format(format) || !ValidES3Type(type))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    // Check if this is a valid format combination to load texture data
    if (!ValidES3FormatCombination(format, type, internalFormat))
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return true;
}

bool ValidateES3TexImageParametersBase(Context *context,
                                       GLenum target,
                                       GLint level,
                                       GLenum internalformat,
                                       bool isCompressed,
                                       bool isSubImage,
                                       GLint xoffset,
                                       GLint yoffset,
                                       GLint zoffset,
                                       GLsizei width,
                                       GLsizei height,
                                       GLsizei depth,
                                       GLint border,
                                       GLenum format,
                                       GLenum type,
                                       GLsizei imageSize,
                                       const GLvoid *pixels)
{
    // Validate image size
    if (!ValidImageSizeParameters(context, target, level, width, height, depth, isSubImage))
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    // Verify zero border
    if (border != 0)
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    if (xoffset < 0 || yoffset < 0 || zoffset < 0 ||
        std::numeric_limits<GLsizei>::max() - xoffset < width ||
        std::numeric_limits<GLsizei>::max() - yoffset < height ||
        std::numeric_limits<GLsizei>::max() - zoffset < depth)
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    const gl::Caps &caps = context->getCaps();

    switch (target)
    {
      case GL_TEXTURE_2D:
        if (static_cast<GLuint>(width) > (caps.max2DTextureSize >> level) ||
            static_cast<GLuint>(height) > (caps.max2DTextureSize >> level))
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }
        break;

      case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
      case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
      case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
      case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
      case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
      case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
        if (!isSubImage && width != height)
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }

        if (static_cast<GLuint>(width) > (caps.maxCubeMapTextureSize >> level))
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }
        break;

      case GL_TEXTURE_3D:
        if (static_cast<GLuint>(width) > (caps.max3DTextureSize >> level) ||
            static_cast<GLuint>(height) > (caps.max3DTextureSize >> level) ||
            static_cast<GLuint>(depth) > (caps.max3DTextureSize >> level))
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }
        break;

      case GL_TEXTURE_2D_ARRAY:
        if (static_cast<GLuint>(width) > (caps.max2DTextureSize >> level) ||
            static_cast<GLuint>(height) > (caps.max2DTextureSize >> level) ||
            static_cast<GLuint>(depth) > caps.maxArrayTextureLayers)
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }
        break;

      default:
          context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    gl::Texture *texture = context->getTargetTexture(IsCubeMapTextureTarget(target) ? GL_TEXTURE_CUBE_MAP : target);
    if (!texture)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    if (texture->getImmutableFormat() && !isSubImage)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    // Validate texture formats
    GLenum actualInternalFormat =
        isSubImage ? texture->getFormat(target, level).asSized() : internalformat;
    const gl::InternalFormat &actualFormatInfo = gl::GetInternalFormatInfo(actualInternalFormat);
    if (isCompressed)
    {
        if (!actualFormatInfo.compressed)
        {
            context->handleError(Error(
                GL_INVALID_ENUM, "internalformat is not a supported compressed internal format."));
            return false;
        }

        if (!ValidCompressedImageSize(context, actualInternalFormat, width, height))
        {
            context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }

        if (!actualFormatInfo.textureSupport(context->getClientMajorVersion(),
                                             context->getExtensions()))
        {
            context->handleError(Error(GL_INVALID_ENUM));
            return false;
        }

        if (target == GL_TEXTURE_3D)
        {
            context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }
    }
    else
    {
        if (!ValidateTexImageFormatCombination(context, actualInternalFormat, format, type))
        {
            return false;
        }

        if (target == GL_TEXTURE_3D && (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL))
        {
            context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }
    }

    // Validate sub image parameters
    if (isSubImage)
    {
        if (isCompressed != actualFormatInfo.compressed)
        {
            context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }

        if (width == 0 || height == 0 || depth == 0)
        {
            return false;
        }

        if (xoffset < 0 || yoffset < 0 || zoffset < 0)
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }

        if (std::numeric_limits<GLsizei>::max() - xoffset < width ||
            std::numeric_limits<GLsizei>::max() - yoffset < height ||
            std::numeric_limits<GLsizei>::max() - zoffset < depth)
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }

        if (static_cast<size_t>(xoffset + width) > texture->getWidth(target, level) ||
            static_cast<size_t>(yoffset + height) > texture->getHeight(target, level) ||
            static_cast<size_t>(zoffset + depth) > texture->getDepth(target, level))
        {
            context->handleError(Error(GL_INVALID_VALUE));
            return false;
        }
    }

    if (!ValidImageDataSize(context, target, width, height, 1, actualInternalFormat, type, pixels,
                            imageSize))
    {
        return false;
    }

    // Check for pixel unpack buffer related API errors
    gl::Buffer *pixelUnpackBuffer = context->getGLState().getTargetBuffer(GL_PIXEL_UNPACK_BUFFER);
    if (pixelUnpackBuffer != nullptr)
    {
        // ...data is not evenly divisible into the number of bytes needed to store in memory a datum
        // indicated by type.
        if (!isCompressed)
        {
            size_t offset            = reinterpret_cast<size_t>(pixels);
            size_t dataBytesPerPixel = static_cast<size_t>(gl::GetTypeInfo(type).bytes);

            if ((offset % dataBytesPerPixel) != 0)
            {
                context->handleError(
                    Error(GL_INVALID_OPERATION, "Reads would overflow the pixel unpack buffer."));
                return false;
            }
        }

        // ...the buffer object's data store is currently mapped.
        if (pixelUnpackBuffer->isMapped())
        {
            context->handleError(Error(GL_INVALID_OPERATION, "Pixel unpack buffer is mapped."));
            return false;
        }
    }

    return true;
}

bool ValidateES3TexImage2DParameters(Context *context,
                                     GLenum target,
                                     GLint level,
                                     GLenum internalformat,
                                     bool isCompressed,
                                     bool isSubImage,
                                     GLint xoffset,
                                     GLint yoffset,
                                     GLint zoffset,
                                     GLsizei width,
                                     GLsizei height,
                                     GLsizei depth,
                                     GLint border,
                                     GLenum format,
                                     GLenum type,
                                     GLsizei imageSize,
                                     const GLvoid *pixels)
{
    if (!ValidTexture2DDestinationTarget(context, target))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    return ValidateES3TexImageParametersBase(context, target, level, internalformat, isCompressed,
                                             isSubImage, xoffset, yoffset, zoffset, width, height,
                                             depth, border, format, type, imageSize, pixels);
}

bool ValidateES3TexImage3DParameters(Context *context,
                                     GLenum target,
                                     GLint level,
                                     GLenum internalformat,
                                     bool isCompressed,
                                     bool isSubImage,
                                     GLint xoffset,
                                     GLint yoffset,
                                     GLint zoffset,
                                     GLsizei width,
                                     GLsizei height,
                                     GLsizei depth,
                                     GLint border,
                                     GLenum format,
                                     GLenum type,
                                     const GLvoid *pixels)
{
    if (!ValidTexture3DDestinationTarget(context, target))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    return ValidateES3TexImageParametersBase(context, target, level, internalformat, isCompressed,
                                             isSubImage, xoffset, yoffset, zoffset, width, height,
                                             depth, border, format, type, -1, pixels);
}

struct EffectiveInternalFormatInfo
{
    GLenum mEffectiveFormat;
    GLenum mDestFormat;
    GLuint mMinRedBits;
    GLuint mMaxRedBits;
    GLuint mMinGreenBits;
    GLuint mMaxGreenBits;
    GLuint mMinBlueBits;
    GLuint mMaxBlueBits;
    GLuint mMinAlphaBits;
    GLuint mMaxAlphaBits;

    EffectiveInternalFormatInfo(GLenum effectiveFormat, GLenum destFormat, GLuint minRedBits, GLuint maxRedBits,
                                GLuint minGreenBits, GLuint maxGreenBits, GLuint minBlueBits, GLuint maxBlueBits,
                                GLuint minAlphaBits, GLuint maxAlphaBits)
        : mEffectiveFormat(effectiveFormat), mDestFormat(destFormat), mMinRedBits(minRedBits),
          mMaxRedBits(maxRedBits), mMinGreenBits(minGreenBits), mMaxGreenBits(maxGreenBits),
          mMinBlueBits(minBlueBits), mMaxBlueBits(maxBlueBits), mMinAlphaBits(minAlphaBits),
          mMaxAlphaBits(maxAlphaBits) {};
};

typedef std::vector<EffectiveInternalFormatInfo> EffectiveInternalFormatList;

static EffectiveInternalFormatList BuildSizedEffectiveInternalFormatList()
{
    EffectiveInternalFormatList list;

    // OpenGL ES 3.0.3 Specification, Table 3.17, pg 141: Effective internal format coresponding to destination internal format and
    //                                                    linear source buffer component sizes.
    //                                                                            | Source channel min/max sizes |
    //                                         Effective Internal Format |  N/A   |  R   |  G   |  B   |  A      |
    list.push_back(EffectiveInternalFormatInfo(GL_ALPHA8_EXT,              GL_NONE, 0,  0, 0,  0, 0,  0, 1, 8));
    list.push_back(EffectiveInternalFormatInfo(GL_R8,                      GL_NONE, 1,  8, 0,  0, 0,  0, 0, 0));
    list.push_back(EffectiveInternalFormatInfo(GL_RG8,                     GL_NONE, 1,  8, 1,  8, 0,  0, 0, 0));
    list.push_back(EffectiveInternalFormatInfo(GL_RGB565,                  GL_NONE, 1,  5, 1,  6, 1,  5, 0, 0));
    list.push_back(EffectiveInternalFormatInfo(GL_RGB8,                    GL_NONE, 6,  8, 7,  8, 6,  8, 0, 0));
    list.push_back(EffectiveInternalFormatInfo(GL_RGBA4,                   GL_NONE, 1,  4, 1,  4, 1,  4, 1, 4));
    list.push_back(EffectiveInternalFormatInfo(GL_RGB5_A1,                 GL_NONE, 5,  5, 5,  5, 5,  5, 1, 1));
    list.push_back(EffectiveInternalFormatInfo(GL_RGBA8,                   GL_NONE, 5,  8, 5,  8, 5,  8, 2, 8));
    list.push_back(EffectiveInternalFormatInfo(GL_RGB10_A2,                GL_NONE, 9, 10, 9, 10, 9, 10, 2, 2));

    return list;
}

static EffectiveInternalFormatList BuildUnsizedEffectiveInternalFormatList()
{
    EffectiveInternalFormatList list;

    // OpenGL ES 3.0.3 Specification, Table 3.17, pg 141: Effective internal format coresponding to destination internal format and
    //                                                    linear source buffer component sizes.
    //                                                                                        |          Source channel min/max sizes            |
    //                                         Effective Internal Format |    Dest Format     |     R     |      G     |      B     |      A     |
    list.push_back(EffectiveInternalFormatInfo(GL_ALPHA8_EXT,              GL_ALPHA,           0, UINT_MAX, 0, UINT_MAX, 0, UINT_MAX, 1,        8));
    list.push_back(EffectiveInternalFormatInfo(GL_LUMINANCE8_EXT,          GL_LUMINANCE,       1,        8, 0, UINT_MAX, 0, UINT_MAX, 0, UINT_MAX));
    list.push_back(EffectiveInternalFormatInfo(GL_LUMINANCE8_ALPHA8_EXT,   GL_LUMINANCE_ALPHA, 1,        8, 0, UINT_MAX, 0, UINT_MAX, 1,        8));
    list.push_back(EffectiveInternalFormatInfo(GL_RGB565,                  GL_RGB,             1,        5, 1,        6, 1,        5, 0, UINT_MAX));
    list.push_back(EffectiveInternalFormatInfo(GL_RGB8,                    GL_RGB,             6,        8, 7,        8, 6,        8, 0, UINT_MAX));
    list.push_back(EffectiveInternalFormatInfo(GL_RGBA4,                   GL_RGBA,            1,        4, 1,        4, 1,        4, 1,        4));
    list.push_back(EffectiveInternalFormatInfo(GL_RGB5_A1,                 GL_RGBA,            5,        5, 5,        5, 5,        5, 1,        1));
    list.push_back(EffectiveInternalFormatInfo(GL_RGBA8,                   GL_RGBA,            5,        8, 5,        8, 5,        8, 5,        8));

    return list;
}

static bool GetEffectiveInternalFormat(const InternalFormat &srcFormat, const InternalFormat &destFormat,
                                       GLenum *outEffectiveFormat)
{
    const EffectiveInternalFormatList *list = NULL;
    GLenum targetFormat = GL_NONE;

    if (destFormat.pixelBytes > 0)
    {
        static const EffectiveInternalFormatList sizedList = BuildSizedEffectiveInternalFormatList();
        list = &sizedList;
    }
    else
    {
        static const EffectiveInternalFormatList unsizedList = BuildUnsizedEffectiveInternalFormatList();
        list = &unsizedList;
        targetFormat = destFormat.format;
    }

    for (size_t curFormat = 0; curFormat < list->size(); ++curFormat)
    {
        const EffectiveInternalFormatInfo& formatInfo = list->at(curFormat);
        if ((formatInfo.mDestFormat == targetFormat) &&
            (formatInfo.mMinRedBits   <= srcFormat.redBits   && formatInfo.mMaxRedBits   >= srcFormat.redBits)   &&
            (formatInfo.mMinGreenBits <= srcFormat.greenBits && formatInfo.mMaxGreenBits >= srcFormat.greenBits) &&
            (formatInfo.mMinBlueBits  <= srcFormat.blueBits  && formatInfo.mMaxBlueBits  >= srcFormat.blueBits)  &&
            (formatInfo.mMinAlphaBits <= srcFormat.alphaBits && formatInfo.mMaxAlphaBits >= srcFormat.alphaBits))
        {
            *outEffectiveFormat = formatInfo.mEffectiveFormat;
            return true;
        }
    }

    return false;
}

struct CopyConversion
{
    GLenum mTextureFormat;
    GLenum mFramebufferFormat;

    CopyConversion(GLenum textureFormat, GLenum framebufferFormat)
        : mTextureFormat(textureFormat), mFramebufferFormat(framebufferFormat) { }

    bool operator<(const CopyConversion& other) const
    {
        return memcmp(this, &other, sizeof(CopyConversion)) < 0;
    }
};

typedef std::set<CopyConversion> CopyConversionSet;

static CopyConversionSet BuildValidES3CopyTexImageCombinations()
{
    CopyConversionSet set;

    // From ES 3.0.1 spec, table 3.15
    set.insert(CopyConversion(GL_ALPHA, GL_RGBA));
    set.insert(CopyConversion(GL_LUMINANCE, GL_RED));
    set.insert(CopyConversion(GL_LUMINANCE, GL_RG));
    set.insert(CopyConversion(GL_LUMINANCE, GL_RGB));
    set.insert(CopyConversion(GL_LUMINANCE, GL_RGBA));
    set.insert(CopyConversion(GL_LUMINANCE_ALPHA, GL_RGBA));
    set.insert(CopyConversion(GL_RED, GL_RED));
    set.insert(CopyConversion(GL_RED, GL_RG));
    set.insert(CopyConversion(GL_RED, GL_RGB));
    set.insert(CopyConversion(GL_RED, GL_RGBA));
    set.insert(CopyConversion(GL_RG, GL_RG));
    set.insert(CopyConversion(GL_RG, GL_RGB));
    set.insert(CopyConversion(GL_RG, GL_RGBA));
    set.insert(CopyConversion(GL_RGB, GL_RGB));
    set.insert(CopyConversion(GL_RGB, GL_RGBA));
    set.insert(CopyConversion(GL_RGBA, GL_RGBA));

    // Necessary for ANGLE back-buffers
    set.insert(CopyConversion(GL_ALPHA, GL_BGRA_EXT));
    set.insert(CopyConversion(GL_LUMINANCE, GL_BGRA_EXT));
    set.insert(CopyConversion(GL_LUMINANCE_ALPHA, GL_BGRA_EXT));
    set.insert(CopyConversion(GL_RED, GL_BGRA_EXT));
    set.insert(CopyConversion(GL_RG, GL_BGRA_EXT));
    set.insert(CopyConversion(GL_RGB, GL_BGRA_EXT));
    set.insert(CopyConversion(GL_RGBA, GL_BGRA_EXT));
    set.insert(CopyConversion(GL_BGRA_EXT, GL_BGRA_EXT));

    set.insert(CopyConversion(GL_RED_INTEGER, GL_RED_INTEGER));
    set.insert(CopyConversion(GL_RED_INTEGER, GL_RG_INTEGER));
    set.insert(CopyConversion(GL_RED_INTEGER, GL_RGB_INTEGER));
    set.insert(CopyConversion(GL_RED_INTEGER, GL_RGBA_INTEGER));
    set.insert(CopyConversion(GL_RG_INTEGER, GL_RG_INTEGER));
    set.insert(CopyConversion(GL_RG_INTEGER, GL_RGB_INTEGER));
    set.insert(CopyConversion(GL_RG_INTEGER, GL_RGBA_INTEGER));
    set.insert(CopyConversion(GL_RGB_INTEGER, GL_RGB_INTEGER));
    set.insert(CopyConversion(GL_RGB_INTEGER, GL_RGBA_INTEGER));
    set.insert(CopyConversion(GL_RGBA_INTEGER, GL_RGBA_INTEGER));

    return set;
}

static bool EqualOrFirstZero(GLuint first, GLuint second)
{
    return first == 0 || first == second;
}

static bool IsValidES3CopyTexImageCombination(const Format &textureFormat,
                                              const Format &framebufferFormat,
                                              GLuint readBufferHandle)
{
    const auto &textureFormatInfo     = *textureFormat.info;
    const auto &framebufferFormatInfo = *framebufferFormat.info;

    static const CopyConversionSet conversionSet = BuildValidES3CopyTexImageCombinations();
    if (conversionSet.find(CopyConversion(textureFormatInfo.format,
                                          framebufferFormatInfo.format)) != conversionSet.end())
    {
        // Section 3.8.5 of the GLES 3.0.3 spec states that source and destination formats
        // must both be signed, unsigned, or fixed point and both source and destinations
        // must be either both SRGB or both not SRGB. EXT_color_buffer_float adds allowed
        // conversion between fixed and floating point.

        if ((textureFormatInfo.colorEncoding == GL_SRGB) !=
            (framebufferFormatInfo.colorEncoding == GL_SRGB))
        {
            return false;
        }

        if (((textureFormatInfo.componentType == GL_INT) !=
             (framebufferFormatInfo.componentType == GL_INT)) ||
            ((textureFormatInfo.componentType == GL_UNSIGNED_INT) !=
             (framebufferFormatInfo.componentType == GL_UNSIGNED_INT)))
        {
            return false;
        }

        if ((textureFormatInfo.componentType == GL_UNSIGNED_NORMALIZED ||
             textureFormatInfo.componentType == GL_SIGNED_NORMALIZED ||
             textureFormatInfo.componentType == GL_FLOAT) &&
            !(framebufferFormatInfo.componentType == GL_UNSIGNED_NORMALIZED ||
              framebufferFormatInfo.componentType == GL_SIGNED_NORMALIZED ||
              framebufferFormatInfo.componentType == GL_FLOAT))
        {
            return false;
        }

        // GLES specification 3.0.3, sec 3.8.5, pg 139-140:
        // The effective internal format of the source buffer is determined with the following rules applied in order:
        //    * If the source buffer is a texture or renderbuffer that was created with a sized internal format then the
        //      effective internal format is the source buffer's sized internal format.
        //    * If the source buffer is a texture that was created with an unsized base internal format, then the
        //      effective internal format is the source image array's effective internal format, as specified by table
        //      3.12, which is determined from the <format> and <type> that were used when the source image array was
        //      specified by TexImage*.
        //    * Otherwise the effective internal format is determined by the row in table 3.17 or 3.18 where
        //      Destination Internal Format matches internalformat and where the [source channel sizes] are consistent
        //      with the values of the source buffer's [channel sizes]. Table 3.17 is used if the
        //      FRAMEBUFFER_ATTACHMENT_ENCODING is LINEAR and table 3.18 is used if the FRAMEBUFFER_ATTACHMENT_ENCODING
        //      is SRGB.
        const InternalFormat *sourceEffectiveFormat = NULL;
        if (readBufferHandle != 0)
        {
            // Not the default framebuffer, therefore the read buffer must be a user-created texture or renderbuffer
            if (framebufferFormat.sized)
            {
                sourceEffectiveFormat = &framebufferFormatInfo;
            }
            else
            {
                // Renderbuffers cannot be created with an unsized internal format, so this must be an unsized-format
                // texture. We can use the same table we use when creating textures to get its effective sized format.
                GLenum sizedInternalFormat = GetSizedInternalFormat(framebufferFormatInfo.format,
                                                                    framebufferFormatInfo.type);
                sourceEffectiveFormat = &GetInternalFormatInfo(sizedInternalFormat);
            }
        }
        else
        {
            // The effective internal format must be derived from the source framebuffer's channel sizes.
            // This is done in GetEffectiveInternalFormat for linear buffers (table 3.17)
            if (framebufferFormatInfo.colorEncoding == GL_LINEAR)
            {
                GLenum effectiveFormat;
                if (GetEffectiveInternalFormat(framebufferFormatInfo, textureFormatInfo,
                                               &effectiveFormat))
                {
                    sourceEffectiveFormat = &GetInternalFormatInfo(effectiveFormat);
                }
                else
                {
                    return false;
                }
            }
            else if (framebufferFormatInfo.colorEncoding == GL_SRGB)
            {
                // SRGB buffers can only be copied to sized format destinations according to table 3.18
                if (textureFormat.sized &&
                    (framebufferFormatInfo.redBits >= 1 && framebufferFormatInfo.redBits <= 8) &&
                    (framebufferFormatInfo.greenBits >= 1 &&
                     framebufferFormatInfo.greenBits <= 8) &&
                    (framebufferFormatInfo.blueBits >= 1 && framebufferFormatInfo.blueBits <= 8) &&
                    (framebufferFormatInfo.alphaBits >= 1 && framebufferFormatInfo.alphaBits <= 8))
                {
                    sourceEffectiveFormat = &GetInternalFormatInfo(GL_SRGB8_ALPHA8);
                }
                else
                {
                    return false;
                }
            }
            else
            {
                UNREACHABLE();
                return false;
            }
        }

        if (textureFormat.sized)
        {
            // Section 3.8.5 of the GLES 3.0.3 spec, pg 139, requires that, if the destination
            // format is sized, component sizes of the source and destination formats must exactly
            // match if the destination format exists.
            if (!EqualOrFirstZero(textureFormatInfo.redBits, sourceEffectiveFormat->redBits) ||
                !EqualOrFirstZero(textureFormatInfo.greenBits, sourceEffectiveFormat->greenBits) ||
                !EqualOrFirstZero(textureFormatInfo.blueBits, sourceEffectiveFormat->blueBits) ||
                !EqualOrFirstZero(textureFormatInfo.alphaBits, sourceEffectiveFormat->alphaBits))
            {
                return false;
            }
        }

        return true; // A conversion function exists, and no rule in the specification has precluded conversion
                     // between these formats.
    }

    return false;
}

bool ValidateES3CopyTexImageParametersBase(ValidationContext *context,
                                           GLenum target,
                                           GLint level,
                                           GLenum internalformat,
                                           bool isSubImage,
                                           GLint xoffset,
                                           GLint yoffset,
                                           GLint zoffset,
                                           GLint x,
                                           GLint y,
                                           GLsizei width,
                                           GLsizei height,
                                           GLint border)
{
    Format textureFormat = Format::Invalid();
    if (!ValidateCopyTexImageParametersBase(context, target, level, internalformat, isSubImage,
                                            xoffset, yoffset, zoffset, x, y, width, height, border,
                                            &textureFormat))
    {
        return false;
    }
    ASSERT(textureFormat.valid() || !isSubImage);

    const auto &state            = context->getGLState();
    gl::Framebuffer *framebuffer = state.getReadFramebuffer();
    GLuint readFramebufferID     = framebuffer->id();

    if (framebuffer->checkStatus(context->getContextState()) != GL_FRAMEBUFFER_COMPLETE)
    {
        context->handleError(Error(GL_INVALID_FRAMEBUFFER_OPERATION));
        return false;
    }

    if (readFramebufferID != 0 && framebuffer->getSamples(context->getContextState()) != 0)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    const FramebufferAttachment *source = framebuffer->getReadColorbuffer();

    if (isSubImage)
    {
        if (!IsValidES3CopyTexImageCombination(textureFormat, source->getFormat(),
                                               readFramebufferID))
        {
            context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }
    }
    else
    {
        // Use format/type from the source FBO. (Might not be perfect for all cases?)
        const auto framebufferFormat = source->getFormat();
        Format copyFormat(internalformat, framebufferFormat.format, framebufferFormat.type);
        if (!IsValidES3CopyTexImageCombination(copyFormat, framebufferFormat, readFramebufferID))
        {
            context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }
    }

    // If width or height is zero, it is a no-op.  Return false without setting an error.
    return (width > 0 && height > 0);
}

bool ValidateES3CopyTexImage2DParameters(ValidationContext *context,
                                         GLenum target,
                                         GLint level,
                                         GLenum internalformat,
                                         bool isSubImage,
                                         GLint xoffset,
                                         GLint yoffset,
                                         GLint zoffset,
                                         GLint x,
                                         GLint y,
                                         GLsizei width,
                                         GLsizei height,
                                         GLint border)
{
    if (!ValidTexture2DDestinationTarget(context, target))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    return ValidateES3CopyTexImageParametersBase(context, target, level, internalformat, isSubImage,
                                                 xoffset, yoffset, zoffset, x, y, width, height,
                                                 border);
}

bool ValidateES3CopyTexImage3DParameters(ValidationContext *context,
                                         GLenum target,
                                         GLint level,
                                         GLenum internalformat,
                                         bool isSubImage,
                                         GLint xoffset,
                                         GLint yoffset,
                                         GLint zoffset,
                                         GLint x,
                                         GLint y,
                                         GLsizei width,
                                         GLsizei height,
                                         GLint border)
{
    if (!ValidTexture3DDestinationTarget(context, target))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    return ValidateES3CopyTexImageParametersBase(context, target, level, internalformat, isSubImage,
                                                 xoffset, yoffset, zoffset, x, y, width, height,
                                                 border);
}

bool ValidateES3TexStorageParametersBase(Context *context,
                                         GLenum target,
                                         GLsizei levels,
                                         GLenum internalformat,
                                         GLsizei width,
                                         GLsizei height,
                                         GLsizei depth)
{
    if (width < 1 || height < 1 || depth < 1 || levels < 1)
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    GLsizei maxDim = std::max(width, height);
    if (target != GL_TEXTURE_2D_ARRAY)
    {
        maxDim = std::max(maxDim, depth);
    }

    if (levels > gl::log2(maxDim) + 1)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    const gl::Caps &caps = context->getCaps();

    switch (target)
    {
      case GL_TEXTURE_2D:
        {
            if (static_cast<GLuint>(width) > caps.max2DTextureSize ||
                static_cast<GLuint>(height) > caps.max2DTextureSize)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
        }
        break;

      case GL_TEXTURE_CUBE_MAP:
        {
            if (width != height)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }

            if (static_cast<GLuint>(width) > caps.maxCubeMapTextureSize)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
        }
        break;

      case GL_TEXTURE_3D:
        {
            if (static_cast<GLuint>(width) > caps.max3DTextureSize ||
                static_cast<GLuint>(height) > caps.max3DTextureSize ||
                static_cast<GLuint>(depth) > caps.max3DTextureSize)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
        }
        break;

      case GL_TEXTURE_2D_ARRAY:
        {
            if (static_cast<GLuint>(width) > caps.max2DTextureSize ||
                static_cast<GLuint>(height) > caps.max2DTextureSize ||
                static_cast<GLuint>(depth) > caps.maxArrayTextureLayers)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
        }
        break;

      default:
          UNREACHABLE();
        return false;
    }

    gl::Texture *texture = context->getTargetTexture(target);
    if (!texture || texture->id() == 0)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    if (texture->getImmutableFormat())
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(internalformat);
    if (!formatInfo.textureSupport(context->getClientMajorVersion(), context->getExtensions()))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    if (formatInfo.pixelBytes == 0)
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    return true;
}

bool ValidateES3TexStorage2DParameters(Context *context,
                                       GLenum target,
                                       GLsizei levels,
                                       GLenum internalformat,
                                       GLsizei width,
                                       GLsizei height,
                                       GLsizei depth)
{
    if (!ValidTexture2DTarget(context, target))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    return ValidateES3TexStorageParametersBase(context, target, levels, internalformat, width,
                                               height, depth);
}

bool ValidateES3TexStorage3DParameters(Context *context,
                                       GLenum target,
                                       GLsizei levels,
                                       GLenum internalformat,
                                       GLsizei width,
                                       GLsizei height,
                                       GLsizei depth)
{
    if (!ValidTexture3DTarget(context, target))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    return ValidateES3TexStorageParametersBase(context, target, levels, internalformat, width,
                                               height, depth);
}

bool ValidateBeginQuery(gl::Context *context, GLenum target, GLuint id)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "GLES version < 3.0"));
        return false;
    }

    return ValidateBeginQueryBase(context, target, id);
}

bool ValidateEndQuery(gl::Context *context, GLenum target)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "GLES version < 3.0"));
        return false;
    }

    return ValidateEndQueryBase(context, target);
}

bool ValidateGetQueryiv(Context *context, GLenum target, GLenum pname, GLint *params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "GLES version < 3.0"));
        return false;
    }

    return ValidateGetQueryivBase(context, target, pname);
}

bool ValidateGetQueryObjectuiv(Context *context, GLuint id, GLenum pname, GLuint *params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "GLES version < 3.0"));
        return false;
    }

    return ValidateGetQueryObjectValueBase(context, id, pname);
}

bool ValidateFramebufferTextureLayer(Context *context, GLenum target, GLenum attachment,
                                     GLuint texture, GLint level, GLint layer)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    if (layer < 0)
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    if (!ValidateFramebufferTextureBase(context, target, attachment, texture, level))
    {
        return false;
    }

    const gl::Caps &caps = context->getCaps();
    if (texture != 0)
    {
        gl::Texture *tex = context->getTexture(texture);
        ASSERT(tex);

        switch (tex->getTarget())
        {
          case GL_TEXTURE_2D_ARRAY:
            {
                if (level > gl::log2(caps.max2DTextureSize))
                {
                    context->handleError(Error(GL_INVALID_VALUE));
                    return false;
                }

                if (static_cast<GLuint>(layer) >= caps.maxArrayTextureLayers)
                {
                    context->handleError(Error(GL_INVALID_VALUE));
                    return false;
                }
            }
            break;

          case GL_TEXTURE_3D:
            {
                if (level > gl::log2(caps.max3DTextureSize))
                {
                    context->handleError(Error(GL_INVALID_VALUE));
                    return false;
                }

                if (static_cast<GLuint>(layer) >= caps.max3DTextureSize)
                {
                    context->handleError(Error(GL_INVALID_VALUE));
                    return false;
                }
            }
            break;

          default:
              context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }

        const auto &format = tex->getFormat(tex->getTarget(), level);
        if (format.info->compressed)
        {
            context->handleError(Error(GL_INVALID_OPERATION));
            return false;
        }
    }

    return true;
}

bool ValidateES3RenderbufferStorageParameters(gl::Context *context, GLenum target, GLsizei samples,
                                              GLenum internalformat, GLsizei width, GLsizei height)
{
    if (!ValidateRenderbufferStorageParametersBase(context, target, samples, internalformat, width, height))
    {
        return false;
    }

    //The ES3 spec(section 4.4.2) states that the internal format must be sized and not an integer format if samples is greater than zero.
    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(internalformat);
    if ((formatInfo.componentType == GL_UNSIGNED_INT || formatInfo.componentType == GL_INT) && samples > 0)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    // The behavior is different than the ANGLE version, which would generate a GL_OUT_OF_MEMORY.
    const TextureCaps &formatCaps = context->getTextureCaps().get(internalformat);
    if (static_cast<GLuint>(samples) > formatCaps.getMaxSamples())
    {
        context->handleError(
            Error(GL_INVALID_OPERATION,
                  "Samples must not be greater than maximum supported value for the format."));
        return false;
    }

    return true;
}

bool ValidateInvalidateFramebuffer(Context *context, GLenum target, GLsizei numAttachments,
                                   const GLenum *attachments)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(
            Error(GL_INVALID_OPERATION, "Operation only supported on ES 3.0 and above"));
        return false;
    }

    bool defaultFramebuffer = false;

    switch (target)
    {
      case GL_DRAW_FRAMEBUFFER:
      case GL_FRAMEBUFFER:
          defaultFramebuffer = context->getGLState().getDrawFramebuffer()->id() == 0;
          break;
      case GL_READ_FRAMEBUFFER:
          defaultFramebuffer = context->getGLState().getReadFramebuffer()->id() == 0;
          break;
      default:
          context->handleError(Error(GL_INVALID_ENUM, "Invalid framebuffer target"));
        return false;
    }

    return ValidateDiscardFramebufferBase(context, target, numAttachments, attachments, defaultFramebuffer);
}

bool ValidateClearBuffer(ValidationContext *context)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    if (context->getGLState().getDrawFramebuffer()->checkStatus(context->getContextState()) !=
        GL_FRAMEBUFFER_COMPLETE)
    {
        context->handleError(Error(GL_INVALID_FRAMEBUFFER_OPERATION));
        return false;
    }

    return true;
}

bool ValidateDrawRangeElements(Context *context,
                               GLenum mode,
                               GLuint start,
                               GLuint end,
                               GLsizei count,
                               GLenum type,
                               const GLvoid *indices,
                               IndexRange *indexRange)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }

    if (end < start)
    {
        context->handleError(Error(GL_INVALID_VALUE, "end < start"));
        return false;
    }

    if (!ValidateDrawElements(context, mode, count, type, indices, 0, indexRange))
    {
        return false;
    }

    if (indexRange->end > end || indexRange->start < start)
    {
        // GL spec says that behavior in this case is undefined - generating an error is fine.
        context->handleError(
            Error(GL_INVALID_OPERATION, "Indices are out of the start, end range."));
        return false;
    }
    return true;
}

bool ValidateGetUniformuiv(Context *context, GLuint program, GLint location, GLuint* params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateGetUniformBase(context, program, location);
}

bool ValidateReadBuffer(Context *context, GLenum src)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    const Framebuffer *readFBO = context->getGLState().getReadFramebuffer();

    if (readFBO == nullptr)
    {
        context->handleError(gl::Error(GL_INVALID_OPERATION, "No active read framebuffer."));
        return false;
    }

    if (src == GL_NONE)
    {
        return true;
    }

    if (src != GL_BACK && (src < GL_COLOR_ATTACHMENT0 || src > GL_COLOR_ATTACHMENT31))
    {
        context->handleError(gl::Error(GL_INVALID_ENUM, "Unknown enum for 'src' in ReadBuffer"));
        return false;
    }

    if (readFBO->id() == 0)
    {
        if (src != GL_BACK)
        {
            const char *errorMsg = "'src' must be GL_NONE or GL_BACK when reading from the default framebuffer.";
            context->handleError(gl::Error(GL_INVALID_OPERATION, errorMsg));
            return false;
        }
    }
    else
    {
        GLuint drawBuffer = static_cast<GLuint>(src - GL_COLOR_ATTACHMENT0);

        if (drawBuffer >= context->getCaps().maxDrawBuffers)
        {
            const char *errorMsg = "'src' is greater than MAX_DRAW_BUFFERS.";
            context->handleError(gl::Error(GL_INVALID_OPERATION, errorMsg));
            return false;
        }
    }

    return true;
}

bool ValidateCompressedTexImage3D(Context *context,
                                  GLenum target,
                                  GLint level,
                                  GLenum internalformat,
                                  GLsizei width,
                                  GLsizei height,
                                  GLsizei depth,
                                  GLint border,
                                  GLsizei imageSize,
                                  const GLvoid *data)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    if (!ValidTextureTarget(context, target))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    // Validate image size
    if (!ValidImageSizeParameters(context, target, level, width, height, depth, false))
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    const InternalFormat &formatInfo = GetInternalFormatInfo(internalformat);
    if (!formatInfo.compressed)
    {
        context->handleError(Error(GL_INVALID_ENUM, "Not a valid compressed texture format"));
        return false;
    }

    auto blockSizeOrErr =
        formatInfo.computeCompressedImageSize(GL_UNSIGNED_BYTE, gl::Extents(width, height, depth));
    if (blockSizeOrErr.isError())
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }
    if (imageSize < 0 || static_cast<GLuint>(imageSize) != blockSizeOrErr.getResult())
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    // 3D texture target validation
    if (target != GL_TEXTURE_3D && target != GL_TEXTURE_2D_ARRAY)
    {
        context->handleError(
            Error(GL_INVALID_ENUM, "Must specify a valid 3D texture destination target"));
        return false;
    }

    // validateES3TexImageFormat sets the error code if there is an error
    if (!ValidateES3TexImage3DParameters(context, target, level, internalformat, true, false, 0, 0,
                                         0, width, height, depth, border, GL_NONE, GL_NONE, data))
    {
        return false;
    }

    return true;
}

bool ValidateBindVertexArray(Context *context, GLuint array)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateBindVertexArrayBase(context, array);
}

bool ValidateIsVertexArray(Context *context)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return true;
}

bool ValidateProgramBinary(Context *context,
                           GLuint program,
                           GLenum binaryFormat,
                           const void *binary,
                           GLint length)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateProgramBinaryBase(context, program, binaryFormat, binary, length);
}

bool ValidateGetProgramBinary(Context *context,
                              GLuint program,
                              GLsizei bufSize,
                              GLsizei *length,
                              GLenum *binaryFormat,
                              void *binary)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateGetProgramBinaryBase(context, program, bufSize, length, binaryFormat, binary);
}

bool ValidateProgramParameteri(Context *context, GLuint program, GLenum pname, GLint value)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }

    if (GetValidProgram(context, program) == nullptr)
    {
        return false;
    }

    switch (pname)
    {
        case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
            if (value != GL_FALSE && value != GL_TRUE)
            {
                context->handleError(Error(
                    GL_INVALID_VALUE, "Invalid value, expected GL_FALSE or GL_TRUE: %i", value));
                return false;
            }
            break;

        default:
            context->handleError(Error(GL_INVALID_ENUM, "Invalid pname: 0x%X", pname));
            return false;
    }

    return true;
}

bool ValidateBlitFramebuffer(Context *context,
                             GLint srcX0,
                             GLint srcY0,
                             GLint srcX1,
                             GLint srcY1,
                             GLint dstX0,
                             GLint dstY0,
                             GLint dstX1,
                             GLint dstY1,
                             GLbitfield mask,
                             GLenum filter)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateBlitFramebufferParameters(context, srcX0, srcY0, srcX1, srcY1, dstX0, dstY0,
                                             dstX1, dstY1, mask, filter);
}

bool ValidateClearBufferiv(ValidationContext *context,
                           GLenum buffer,
                           GLint drawbuffer,
                           const GLint *value)
{
    switch (buffer)
    {
        case GL_COLOR:
            if (drawbuffer < 0 ||
                static_cast<GLuint>(drawbuffer) >= context->getCaps().maxDrawBuffers)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;

        case GL_STENCIL:
            if (drawbuffer != 0)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;

        default:
            context->handleError(Error(GL_INVALID_ENUM));
            return false;
    }

    return ValidateClearBuffer(context);
}

bool ValidateClearBufferuiv(ValidationContext *context,
                            GLenum buffer,
                            GLint drawbuffer,
                            const GLuint *value)
{
    switch (buffer)
    {
        case GL_COLOR:
            if (drawbuffer < 0 ||
                static_cast<GLuint>(drawbuffer) >= context->getCaps().maxDrawBuffers)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;

        default:
            context->handleError(Error(GL_INVALID_ENUM));
            return false;
    }

    return ValidateClearBuffer(context);
}

bool ValidateClearBufferfv(ValidationContext *context,
                           GLenum buffer,
                           GLint drawbuffer,
                           const GLfloat *value)
{
    switch (buffer)
    {
        case GL_COLOR:
            if (drawbuffer < 0 ||
                static_cast<GLuint>(drawbuffer) >= context->getCaps().maxDrawBuffers)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;

        case GL_DEPTH:
            if (drawbuffer != 0)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;

        default:
            context->handleError(Error(GL_INVALID_ENUM));
            return false;
    }

    return ValidateClearBuffer(context);
}

bool ValidateClearBufferfi(ValidationContext *context,
                           GLenum buffer,
                           GLint drawbuffer,
                           GLfloat depth,
                           GLint stencil)
{
    switch (buffer)
    {
        case GL_DEPTH_STENCIL:
            if (drawbuffer != 0)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;

        default:
            context->handleError(Error(GL_INVALID_ENUM));
            return false;
    }

    return ValidateClearBuffer(context);
}

bool ValidateDrawBuffers(ValidationContext *context, GLsizei n, const GLenum *bufs)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }

    return ValidateDrawBuffersBase(context, n, bufs);
}

bool ValidateCopyTexSubImage3D(Context *context,
                               GLenum target,
                               GLint level,
                               GLint xoffset,
                               GLint yoffset,
                               GLint zoffset,
                               GLint x,
                               GLint y,
                               GLsizei width,
                               GLsizei height)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateES3CopyTexImage3DParameters(context, target, level, GL_NONE, true, xoffset,
                                               yoffset, zoffset, x, y, width, height, 0);
}

bool ValidateTexImage3D(Context *context,
                        GLenum target,
                        GLint level,
                        GLint internalformat,
                        GLsizei width,
                        GLsizei height,
                        GLsizei depth,
                        GLint border,
                        GLenum format,
                        GLenum type,
                        const GLvoid *pixels)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateES3TexImage3DParameters(context, target, level, internalformat, false, false, 0,
                                           0, 0, width, height, depth, border, format, type,
                                           pixels);
}

bool ValidateTexSubImage3D(Context *context,
                           GLenum target,
                           GLint level,
                           GLint xoffset,
                           GLint yoffset,
                           GLint zoffset,
                           GLsizei width,
                           GLsizei height,
                           GLsizei depth,
                           GLenum format,
                           GLenum type,
                           const GLvoid *pixels)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateES3TexImage3DParameters(context, target, level, GL_NONE, false, true, xoffset,
                                           yoffset, zoffset, width, height, depth, 0, format, type,
                                           pixels);
}

bool ValidateCompressedTexSubImage3D(Context *context,
                                     GLenum target,
                                     GLint level,
                                     GLint xoffset,
                                     GLint yoffset,
                                     GLint zoffset,
                                     GLsizei width,
                                     GLsizei height,
                                     GLsizei depth,
                                     GLenum format,
                                     GLsizei imageSize,
                                     const GLvoid *data)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    const InternalFormat &formatInfo = GetInternalFormatInfo(format);
    auto blockSizeOrErr =
        formatInfo.computeCompressedImageSize(GL_UNSIGNED_BYTE, gl::Extents(width, height, depth));
    if (blockSizeOrErr.isError())
    {
        context->handleError(blockSizeOrErr.getError());
        return false;
    }
    if (imageSize < 0 || static_cast<GLuint>(imageSize) != blockSizeOrErr.getResult())
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    if (!data)
    {
        context->handleError(Error(GL_INVALID_VALUE));
        return false;
    }

    return ValidateES3TexImage3DParameters(context, target, level, GL_NONE, true, true, 0, 0, 0,
                                           width, height, depth, 0, GL_NONE, GL_NONE, data);
}

bool ValidateGenQueries(Context *context, GLint n, GLuint *)
{
    return ValidateGenOrDeleteES3(context, n);
}

bool ValidateDeleteQueries(Context *context, GLint n, const GLuint *)
{
    return ValidateGenOrDeleteES3(context, n);
}

bool ValidateGenSamplers(Context *context, GLint count, GLuint *)
{
    return ValidateGenOrDeleteCountES3(context, count);
}

bool ValidateDeleteSamplers(Context *context, GLint count, const GLuint *)
{
    return ValidateGenOrDeleteCountES3(context, count);
}

bool ValidateGenTransformFeedbacks(Context *context, GLint n, GLuint *)
{
    return ValidateGenOrDeleteES3(context, n);
}

bool ValidateDeleteTransformFeedbacks(Context *context, GLint n, const GLuint *ids)
{
    if (!ValidateGenOrDeleteES3(context, n))
    {
        return false;
    }
    for (GLint i = 0; i < n; ++i)
    {
        auto *transformFeedback = context->getTransformFeedback(ids[i]);
        if (transformFeedback != nullptr && transformFeedback->isActive())
        {
            // ES 3.0.4 section 2.15.1 page 86
            context->handleError(
                Error(GL_INVALID_OPERATION, "Attempt to delete active transform feedback."));
            return false;
        }
    }
    return true;
}

bool ValidateGenVertexArrays(Context *context, GLint n, GLuint *)
{
    return ValidateGenOrDeleteES3(context, n);
}

bool ValidateDeleteVertexArrays(Context *context, GLint n, const GLuint *)
{
    return ValidateGenOrDeleteES3(context, n);
}

bool ValidateGenOrDeleteES3(Context *context, GLint n)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }
    return ValidateGenOrDelete(context, n);
}

bool ValidateGenOrDeleteCountES3(Context *context, GLint count)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }
    if (count < 0)
    {
        context->handleError(Error(GL_INVALID_VALUE, "count < 0"));
        return false;
    }
    return true;
}

bool ValidateBeginTransformFeedback(Context *context, GLenum primitiveMode)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }
    switch (primitiveMode)
    {
        case GL_TRIANGLES:
        case GL_LINES:
        case GL_POINTS:
            break;

        default:
            context->handleError(Error(GL_INVALID_ENUM, "Invalid primitive mode."));
            return false;
    }

    TransformFeedback *transformFeedback = context->getGLState().getCurrentTransformFeedback();
    ASSERT(transformFeedback != nullptr);

    if (transformFeedback->isActive())
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Transform feedback is already active."));
        return false;
    }
    return true;
}

bool ValidateSamplerParameteri(Context *context, GLuint sampler, GLenum pname, GLint param)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }

    if (!context->isSampler(sampler))
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    if (!ValidateSamplerObjectParameter(context, pname))
    {
        return false;
    }

    if (!ValidateTexParamParameters(context, GL_TEXTURE_2D, pname, param))
    {
        return false;
    }
    return true;
}

bool ValidateSamplerParameterf(Context *context, GLuint sampler, GLenum pname, GLfloat param)
{
    // The only float parameters are MIN_LOD and MAX_LOD. For these any value is permissible, so
    // ValidateSamplerParameteri can be used for validation here.
    return ValidateSamplerParameteri(context, sampler, pname, static_cast<GLint>(param));
}

bool ValidateGetBufferPointerv(Context *context, GLenum target, GLenum pname, GLvoid **params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }

    return ValidateGetBufferPointervBase(context, target, pname, params);
}

bool ValidateUnmapBuffer(Context *context, GLenum target)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION));
        return false;
    }

    return ValidateUnmapBufferBase(context, target);
}

bool ValidateMapBufferRange(Context *context,
                            GLenum target,
                            GLintptr offset,
                            GLsizeiptr length,
                            GLbitfield access)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }

    return ValidateMapBufferRangeBase(context, target, offset, length, access);
}

bool ValidateFlushMappedBufferRange(Context *context,
                                    GLenum target,
                                    GLintptr offset,
                                    GLsizeiptr length)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3."));
        return false;
    }

    return ValidateFlushMappedBufferRangeBase(context, target, offset, length);
}

bool ValidateIndexedStateQuery(ValidationContext *context, GLenum pname, GLuint index)
{
    GLenum nativeType;
    unsigned int numParams;
    if (!context->getIndexedQueryParameterInfo(pname, &nativeType, &numParams))
    {
        context->handleError(Error(GL_INVALID_ENUM));
        return false;
    }

    const Caps &caps = context->getCaps();
    switch (pname)
    {
        case GL_TRANSFORM_FEEDBACK_BUFFER_START:
        case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE:
        case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
            if (index >= caps.maxTransformFeedbackSeparateAttributes)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;

        case GL_UNIFORM_BUFFER_START:
        case GL_UNIFORM_BUFFER_SIZE:
        case GL_UNIFORM_BUFFER_BINDING:
            if (index >= caps.maxUniformBufferBindings)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;
        case GL_MAX_COMPUTE_WORK_GROUP_SIZE:
        case GL_MAX_COMPUTE_WORK_GROUP_COUNT:
            if (index >= 3u)
            {
                context->handleError(Error(GL_INVALID_VALUE));
                return false;
            }
            break;
        default:
            context->handleError(Error(GL_INVALID_ENUM));
            return false;
    }

    // pname is valid, but there are no parameters to return
    if (numParams == 0)
    {
        return false;
    }

    return true;
}

bool ValidateGetIntegeri_v(ValidationContext *context, GLenum target, GLuint index, GLint *data)
{
    if (!context->getGLVersion().isES3OrGreater())
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3.0"));
        return false;
    }
    return ValidateIndexedStateQuery(context, target, index);
}

bool ValidateGetInteger64i_v(ValidationContext *context, GLenum target, GLuint index, GLint64 *data)
{
    if (!context->getGLVersion().isES3OrGreater())
    {
        context->handleError(Error(GL_INVALID_OPERATION, "Context does not support GLES3.0"));
        return false;
    }
    return ValidateIndexedStateQuery(context, target, index);
}

}  // namespace gl