//
// Copyright 2016 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.
//
// TextureVk.cpp:
//    Implements the class methods for TextureVk.
//

#include "libANGLE/renderer/vulkan/TextureVk.h"
#include <vulkan/vulkan.h>

#include "common/debug.h"
#include "image_util/generatemip.inc"
#include "libANGLE/Config.h"
#include "libANGLE/Context.h"
#include "libANGLE/Image.h"
#include "libANGLE/MemoryObject.h"
#include "libANGLE/Surface.h"
#include "libANGLE/renderer/vulkan/ContextVk.h"
#include "libANGLE/renderer/vulkan/FramebufferVk.h"
#include "libANGLE/renderer/vulkan/ImageVk.h"
#include "libANGLE/renderer/vulkan/MemoryObjectVk.h"
#include "libANGLE/renderer/vulkan/RendererVk.h"
#include "libANGLE/renderer/vulkan/SurfaceVk.h"
#include "libANGLE/renderer/vulkan/vk_format_utils.h"
#include "libANGLE/trace.h"

namespace rx
{
namespace
{
constexpr VkImageUsageFlags kDrawStagingImageFlags = VK_IMAGE_USAGE_TRANSFER_SRC_BIT |
                                                     VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT |
                                                     VK_IMAGE_USAGE_TRANSFER_DST_BIT;

constexpr VkImageUsageFlags kTransferStagingImageFlags =
    VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT;

constexpr VkFormatFeatureFlags kBlitFeatureFlags =
    VK_FORMAT_FEATURE_BLIT_SRC_BIT | VK_FORMAT_FEATURE_BLIT_DST_BIT;

constexpr angle::SubjectIndex kStagingBufferSubjectIndex = 0;

bool CanCopyWithTransfer(RendererVk *renderer,
                         const vk::Format &srcFormat,
                         const vk::Format &destFormat)
{
    // NOTE(syoussefi): technically, you can transfer between formats as long as they have the same
    // size and are compatible, but for now, let's just support same-format copies with transfer.
    return srcFormat.internalFormat == destFormat.internalFormat &&
           renderer->hasImageFormatFeatureBits(srcFormat.vkImageFormat,
                                               VK_FORMAT_FEATURE_TRANSFER_SRC_BIT) &&
           renderer->hasImageFormatFeatureBits(destFormat.vkImageFormat,
                                               VK_FORMAT_FEATURE_TRANSFER_DST_BIT);
}

bool CanCopyWithDraw(RendererVk *renderer,
                     const vk::Format &srcFormat,
                     const vk::Format &destFormat)
{
    return renderer->hasImageFormatFeatureBits(srcFormat.vkImageFormat,
                                               VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT) &&
           renderer->hasImageFormatFeatureBits(destFormat.vkImageFormat,
                                               VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT);
}

bool ForceCPUPathForCopy(RendererVk *renderer, const vk::ImageHelper &image)
{
    return image.getLayerCount() > 1 && renderer->getFeatures().forceCPUPathForCubeMapCopy.enabled;
}

void GetRenderTargetLayerCountAndIndex(vk::ImageHelper *image,
                                       const gl::ImageIndex &index,
                                       GLuint *layerCount,
                                       GLuint *layerIndex)
{
    switch (index.getType())
    {
        case gl::TextureType::_2D:
        case gl::TextureType::_2DMultisample:
            *layerIndex = 0;
            *layerCount = 1;
            return;

        case gl::TextureType::CubeMap:
            *layerIndex = index.cubeMapFaceIndex();
            *layerCount = gl::kCubeFaceCount;
            return;

        case gl::TextureType::_3D:
            *layerIndex = index.hasLayer() ? index.getLayerIndex() : 0;
            *layerCount = image->getExtents().depth;
            return;

        case gl::TextureType::_2DArray:
        case gl::TextureType::_2DMultisampleArray:
            *layerIndex = index.hasLayer() ? index.getLayerIndex() : 0;
            *layerCount = image->getLayerCount();
            return;

        default:
            UNREACHABLE();
    }
}
}  // anonymous namespace

// TextureVk implementation.
TextureVk::TextureVk(const gl::TextureState &state, RendererVk *renderer)
    : TextureImpl(state),
      mOwnsImage(false),
      mImageNativeType(gl::TextureType::InvalidEnum),
      mImageLayerOffset(0),
      mImageLevelOffset(0),
      mImage(nullptr),
      mStagingBufferInitialSize(vk::kStagingBufferSize),
      mImageUsageFlags(0),
      mStagingBufferObserverBinding(this, kStagingBufferSubjectIndex)
{}

TextureVk::~TextureVk() = default;

void TextureVk::onDestroy(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);

    releaseAndDeleteImage(contextVk);
    mSampler.release(contextVk->getRenderer());
}

angle::Result TextureVk::setImage(const gl::Context *context,
                                  const gl::ImageIndex &index,
                                  GLenum internalFormat,
                                  const gl::Extents &size,
                                  GLenum format,
                                  GLenum type,
                                  const gl::PixelUnpackState &unpack,
                                  gl::Buffer *unpackBuffer,
                                  const uint8_t *pixels)
{
    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(internalFormat, type);

    return setImageImpl(context, index, formatInfo, size, type, unpack, unpackBuffer, pixels);
}

angle::Result TextureVk::setSubImage(const gl::Context *context,
                                     const gl::ImageIndex &index,
                                     const gl::Box &area,
                                     GLenum format,
                                     GLenum type,
                                     const gl::PixelUnpackState &unpack,
                                     gl::Buffer *unpackBuffer,
                                     const uint8_t *pixels)
{
    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(format, type);
    ContextVk *contextVk                 = vk::GetImpl(context);
    const gl::ImageDesc &levelDesc       = mState.getImageDesc(index);
    const vk::Format &vkFormat =
        contextVk->getRenderer()->getFormat(levelDesc.format.info->sizedInternalFormat);

    return setSubImageImpl(context, index, area, formatInfo, type, unpack, unpackBuffer, pixels,
                           vkFormat);
}

angle::Result TextureVk::setCompressedImage(const gl::Context *context,
                                            const gl::ImageIndex &index,
                                            GLenum internalFormat,
                                            const gl::Extents &size,
                                            const gl::PixelUnpackState &unpack,
                                            size_t imageSize,
                                            const uint8_t *pixels)
{
    const gl::InternalFormat &formatInfo = gl::GetSizedInternalFormatInfo(internalFormat);

    const gl::State &glState = context->getState();
    gl::Buffer *unpackBuffer = glState.getTargetBuffer(gl::BufferBinding::PixelUnpack);

    return setImageImpl(context, index, formatInfo, size, GL_UNSIGNED_BYTE, unpack, unpackBuffer,
                        pixels);
}

angle::Result TextureVk::setCompressedSubImage(const gl::Context *context,
                                               const gl::ImageIndex &index,
                                               const gl::Box &area,
                                               GLenum format,
                                               const gl::PixelUnpackState &unpack,
                                               size_t imageSize,
                                               const uint8_t *pixels)
{

    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(format, GL_UNSIGNED_BYTE);
    ContextVk *contextVk                 = vk::GetImpl(context);
    const gl::ImageDesc &levelDesc       = mState.getImageDesc(index);
    const vk::Format &vkFormat =
        contextVk->getRenderer()->getFormat(levelDesc.format.info->sizedInternalFormat);
    const gl::State &glState = contextVk->getState();
    gl::Buffer *unpackBuffer = glState.getTargetBuffer(gl::BufferBinding::PixelUnpack);

    return setSubImageImpl(context, index, area, formatInfo, GL_UNSIGNED_BYTE, unpack, unpackBuffer,
                           pixels, vkFormat);
}

angle::Result TextureVk::setImageImpl(const gl::Context *context,
                                      const gl::ImageIndex &index,
                                      const gl::InternalFormat &formatInfo,
                                      const gl::Extents &size,
                                      GLenum type,
                                      const gl::PixelUnpackState &unpack,
                                      gl::Buffer *unpackBuffer,
                                      const uint8_t *pixels)
{
    ContextVk *contextVk = vk::GetImpl(context);
    RendererVk *renderer = contextVk->getRenderer();

    const vk::Format &vkFormat = renderer->getFormat(formatInfo.sizedInternalFormat);

    ANGLE_TRY(redefineImage(context, index, vkFormat, size));

    // Early-out on empty textures, don't create a zero-sized storage.
    if (size.empty())
    {
        return angle::Result::Continue;
    }

    return setSubImageImpl(context, index, gl::Box(0, 0, 0, size.width, size.height, size.depth),
                           formatInfo, type, unpack, unpackBuffer, pixels, vkFormat);
}

angle::Result TextureVk::setSubImageImpl(const gl::Context *context,
                                         const gl::ImageIndex &index,
                                         const gl::Box &area,
                                         const gl::InternalFormat &formatInfo,
                                         GLenum type,
                                         const gl::PixelUnpackState &unpack,
                                         gl::Buffer *unpackBuffer,
                                         const uint8_t *pixels,
                                         const vk::Format &vkFormat)
{
    ContextVk *contextVk = vk::GetImpl(context);

    if (unpackBuffer)
    {
        BufferVk *unpackBufferVk       = vk::GetImpl(unpackBuffer);
        vk::BufferHelper &bufferHelper = unpackBufferVk->getBuffer();
        uintptr_t offset               = reinterpret_cast<uintptr_t>(pixels);
        GLuint inputRowPitch           = 0;
        GLuint inputDepthPitch         = 0;
        GLuint inputSkipBytes          = 0;

        ANGLE_TRY(mImage->CalculateBufferInfo(
            contextVk, gl::Extents(area.width, area.height, area.depth), formatInfo, unpack, type,
            index.usesTex3D(), &inputRowPitch, &inputDepthPitch, &inputSkipBytes));

        size_t offsetBytes = static_cast<size_t>(offset + inputSkipBytes);

        if (isFastUnpackPossible(vkFormat, offsetBytes))
        {
            GLuint pixelSize   = formatInfo.pixelBytes;
            GLuint blockWidth  = formatInfo.compressedBlockWidth;
            GLuint blockHeight = formatInfo.compressedBlockHeight;
            if (!formatInfo.compressed)
            {
                pixelSize   = formatInfo.computePixelBytes(type);
                blockWidth  = 1;
                blockHeight = 1;
            }
            ASSERT(pixelSize != 0 && inputRowPitch != 0 && blockWidth != 0 && blockHeight != 0);

            GLuint rowLengthPixels   = inputRowPitch / pixelSize * blockWidth;
            GLuint imageHeightPixels = inputDepthPitch / inputRowPitch * blockHeight;

            ANGLE_TRY(copyBufferDataToImage(contextVk, &bufferHelper, index, rowLengthPixels,
                                            imageHeightPixels, area, offsetBytes));
        }
        else
        {
            void *mapPtr = nullptr;

            ANGLE_TRY(unpackBufferVk->mapImpl(contextVk, &mapPtr));

            const uint8_t *source =
                static_cast<const uint8_t *>(mapPtr) + reinterpret_cast<ptrdiff_t>(pixels);

            ANGLE_TRY(mImage->stageSubresourceUpdateImpl(
                contextVk, getNativeImageIndex(index),
                gl::Extents(area.width, area.height, area.depth),
                gl::Offset(area.x, area.y, area.z), formatInfo, unpack, type, source, vkFormat,
                inputRowPitch, inputDepthPitch, inputSkipBytes));

            ANGLE_TRY(unpackBufferVk->unmapImpl(contextVk));
        }
    }
    else if (pixels)
    {
        ANGLE_TRY(mImage->stageSubresourceUpdate(
            contextVk, getNativeImageIndex(index), gl::Extents(area.width, area.height, area.depth),
            gl::Offset(area.x, area.y, area.z), formatInfo, unpack, type, pixels, vkFormat));
    }

    return angle::Result::Continue;
}

angle::Result TextureVk::copyImage(const gl::Context *context,
                                   const gl::ImageIndex &index,
                                   const gl::Rectangle &sourceArea,
                                   GLenum internalFormat,
                                   gl::Framebuffer *source)
{
    RendererVk *renderer = vk::GetImpl(context)->getRenderer();

    gl::Extents newImageSize(sourceArea.width, sourceArea.height, 1);
    const gl::InternalFormat &internalFormatInfo =
        gl::GetInternalFormatInfo(internalFormat, GL_UNSIGNED_BYTE);
    const vk::Format &vkFormat = renderer->getFormat(internalFormatInfo.sizedInternalFormat);

    ANGLE_TRY(redefineImage(context, index, vkFormat, newImageSize));
    return copySubImageImpl(context, index, gl::Offset(0, 0, 0), sourceArea, internalFormatInfo,
                            source);
}

angle::Result TextureVk::copySubImage(const gl::Context *context,
                                      const gl::ImageIndex &index,
                                      const gl::Offset &destOffset,
                                      const gl::Rectangle &sourceArea,
                                      gl::Framebuffer *source)
{
    const gl::InternalFormat &currentFormat = *mState.getImageDesc(index).format.info;
    return copySubImageImpl(context, index, destOffset, sourceArea, currentFormat, source);
}

angle::Result TextureVk::copyTexture(const gl::Context *context,
                                     const gl::ImageIndex &index,
                                     GLenum internalFormat,
                                     GLenum type,
                                     size_t sourceLevel,
                                     bool unpackFlipY,
                                     bool unpackPremultiplyAlpha,
                                     bool unpackUnmultiplyAlpha,
                                     const gl::Texture *source)
{
    RendererVk *renderer = vk::GetImpl(context)->getRenderer();

    TextureVk *sourceVk = vk::GetImpl(source);
    const gl::ImageDesc &sourceImageDesc =
        sourceVk->mState.getImageDesc(NonCubeTextureTypeToTarget(source->getType()), sourceLevel);
    gl::Rectangle sourceArea(0, 0, sourceImageDesc.size.width, sourceImageDesc.size.height);

    const gl::InternalFormat &destFormatInfo = gl::GetInternalFormatInfo(internalFormat, type);
    const vk::Format &destVkFormat = renderer->getFormat(destFormatInfo.sizedInternalFormat);

    ANGLE_TRY(redefineImage(context, index, destVkFormat, sourceImageDesc.size));

    return copySubTextureImpl(vk::GetImpl(context), index, gl::kOffsetZero, destFormatInfo,
                              sourceLevel, sourceArea, unpackFlipY, unpackPremultiplyAlpha,
                              unpackUnmultiplyAlpha, sourceVk);
}

angle::Result TextureVk::copySubTexture(const gl::Context *context,
                                        const gl::ImageIndex &index,
                                        const gl::Offset &destOffset,
                                        size_t sourceLevel,
                                        const gl::Box &sourceBox,
                                        bool unpackFlipY,
                                        bool unpackPremultiplyAlpha,
                                        bool unpackUnmultiplyAlpha,
                                        const gl::Texture *source)
{
    gl::TextureTarget target                 = index.getTarget();
    size_t level                             = static_cast<size_t>(index.getLevelIndex());
    const gl::InternalFormat &destFormatInfo = *mState.getImageDesc(target, level).format.info;
    return copySubTextureImpl(vk::GetImpl(context), index, destOffset, destFormatInfo, sourceLevel,
                              sourceBox.toRect(), unpackFlipY, unpackPremultiplyAlpha,
                              unpackUnmultiplyAlpha, vk::GetImpl(source));
}

angle::Result TextureVk::copyCompressedTexture(const gl::Context *context,
                                               const gl::Texture *source)
{
    ContextVk *contextVk = vk::GetImpl(context);
    TextureVk *sourceVk  = vk::GetImpl(source);

    gl::TextureTarget sourceTarget = NonCubeTextureTypeToTarget(source->getType());
    constexpr GLint sourceLevel    = 0;
    constexpr GLint destLevel      = 0;

    const gl::InternalFormat &internalFormat = *source->getFormat(sourceTarget, sourceLevel).info;
    const vk::Format &vkFormat =
        contextVk->getRenderer()->getFormat(internalFormat.sizedInternalFormat);
    const gl::Extents size(static_cast<int>(source->getWidth(sourceTarget, sourceLevel)),
                           static_cast<int>(source->getHeight(sourceTarget, sourceLevel)), 1);
    const gl::ImageIndex destIndex = gl::ImageIndex::MakeFromTarget(sourceTarget, destLevel, 1);

    ANGLE_TRY(redefineImage(context, destIndex, vkFormat, size));

    ANGLE_TRY(sourceVk->ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

    return copySubImageImplWithTransfer(
        contextVk, destIndex, gl::Offset(0, 0, 0), vkFormat, sourceLevel, 0,
        gl::Rectangle(0, 0, size.width, size.height), &sourceVk->getImage());
}

angle::Result TextureVk::copySubImageImpl(const gl::Context *context,
                                          const gl::ImageIndex &index,
                                          const gl::Offset &destOffset,
                                          const gl::Rectangle &sourceArea,
                                          const gl::InternalFormat &internalFormat,
                                          gl::Framebuffer *source)
{
    gl::Extents fbSize = source->getReadColorAttachment()->getSize();
    gl::Rectangle clippedSourceArea;
    if (!ClipRectangle(sourceArea, gl::Rectangle(0, 0, fbSize.width, fbSize.height),
                       &clippedSourceArea))
    {
        return angle::Result::Continue;
    }

    ContextVk *contextVk         = vk::GetImpl(context);
    RendererVk *renderer         = contextVk->getRenderer();
    FramebufferVk *framebufferVk = vk::GetImpl(source);

    const gl::ImageIndex offsetImageIndex = getNativeImageIndex(index);

    // If negative offsets are given, clippedSourceArea ensures we don't read from those offsets.
    // However, that changes the sourceOffset->destOffset mapping.  Here, destOffset is shifted by
    // the same amount as clipped to correct the error.
    VkImageType imageType = gl_vk::GetImageType(mState.getType());
    int zOffset           = (imageType == VK_IMAGE_TYPE_3D) ? destOffset.z : 0;
    const gl::Offset modifiedDestOffset(destOffset.x + clippedSourceArea.x - sourceArea.x,
                                        destOffset.y + clippedSourceArea.y - sourceArea.y, zOffset);

    RenderTargetVk *colorReadRT = framebufferVk->getColorReadRenderTarget();

    const vk::Format &srcFormat  = colorReadRT->getImageFormat();
    const vk::Format &destFormat = renderer->getFormat(internalFormat.sizedInternalFormat);

    bool isViewportFlipY = contextVk->isViewportFlipEnabledForReadFBO();

    // If it's possible to perform the copy with a transfer, that's the best option.
    if (!isViewportFlipY && CanCopyWithTransfer(renderer, srcFormat, destFormat))
    {
        return copySubImageImplWithTransfer(contextVk, offsetImageIndex, modifiedDestOffset,
                                            destFormat, colorReadRT->getLevelIndex(),
                                            colorReadRT->getLayerIndex(), clippedSourceArea,
                                            &colorReadRT->getImage());
    }

    bool forceCPUPath = ForceCPUPathForCopy(renderer, *mImage);

    // If it's possible to perform the copy with a draw call, do that.
    if (CanCopyWithDraw(renderer, srcFormat, destFormat) && !forceCPUPath)
    {
        // Layer count can only be 1 as the source is a framebuffer.
        ASSERT(offsetImageIndex.getLayerCount() == 1);

        const vk::ImageView *readImageView = nullptr;
        ANGLE_TRY(colorReadRT->getImageView(contextVk, &readImageView));
        colorReadRT->retainImageViews(contextVk);

        return copySubImageImplWithDraw(contextVk, offsetImageIndex, modifiedDestOffset, destFormat,
                                        0, clippedSourceArea, isViewportFlipY, false, false, false,
                                        &colorReadRT->getImage(), readImageView);
    }

    // Do a CPU readback that does the conversion, and then stage the change to the pixel buffer.
    ANGLE_TRY(mImage->stageSubresourceUpdateFromFramebuffer(
        context, offsetImageIndex, clippedSourceArea, modifiedDestOffset,
        gl::Extents(clippedSourceArea.width, clippedSourceArea.height, 1), internalFormat,
        framebufferVk));

    return angle::Result::Continue;
}

angle::Result TextureVk::copySubTextureImpl(ContextVk *contextVk,
                                            const gl::ImageIndex &index,
                                            const gl::Offset &destOffset,
                                            const gl::InternalFormat &destFormat,
                                            size_t sourceLevel,
                                            const gl::Rectangle &sourceArea,
                                            bool unpackFlipY,
                                            bool unpackPremultiplyAlpha,
                                            bool unpackUnmultiplyAlpha,
                                            TextureVk *source)
{
    RendererVk *renderer = contextVk->getRenderer();

    ANGLE_TRY(source->ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

    const vk::Format &sourceVkFormat = source->getImage().getFormat();
    const vk::Format &destVkFormat   = renderer->getFormat(destFormat.sizedInternalFormat);

    const gl::ImageIndex offsetImageIndex = getNativeImageIndex(index);

    // If it's possible to perform the copy with a transfer, that's the best option.
    if (!unpackFlipY && !unpackPremultiplyAlpha && !unpackUnmultiplyAlpha &&
        CanCopyWithTransfer(renderer, sourceVkFormat, destVkFormat))
    {
        return copySubImageImplWithTransfer(contextVk, offsetImageIndex, destOffset, destVkFormat,
                                            sourceLevel, 0, sourceArea, &source->getImage());
    }

    bool forceCPUPath = ForceCPUPathForCopy(renderer, *mImage);

    // If it's possible to perform the copy with a draw call, do that.
    if (CanCopyWithDraw(renderer, sourceVkFormat, destVkFormat) && !forceCPUPath)
    {
        return copySubImageImplWithDraw(
            contextVk, offsetImageIndex, destOffset, destVkFormat, sourceLevel, sourceArea, false,
            unpackFlipY, unpackPremultiplyAlpha, unpackUnmultiplyAlpha, &source->getImage(),
            &source->getFetchImageViewAndRecordUse(contextVk));
    }

    if (sourceLevel != 0)
    {
        WARN() << "glCopyTextureCHROMIUM with sourceLevel != 0 not implemented.";
        return angle::Result::Stop;
    }

    // Read back the requested region of the source texture
    uint8_t *sourceData = nullptr;
    gl::Box area(0, 0, 0, sourceArea.width, sourceArea.height, 1);
    ANGLE_TRY(
        source->copyImageDataToBufferAndGetData(contextVk, sourceLevel, 1, area, &sourceData));

    const angle::Format &sourceTextureFormat = sourceVkFormat.actualImageFormat();
    const angle::Format &destTextureFormat   = destVkFormat.actualImageFormat();
    size_t destinationAllocationSize =
        sourceArea.width * sourceArea.height * destTextureFormat.pixelBytes;

    // Allocate memory in the destination texture for the copy/conversion
    uint8_t *destData = nullptr;
    ANGLE_TRY(mImage->stageSubresourceUpdateAndGetData(
        contextVk, destinationAllocationSize, offsetImageIndex,
        gl::Extents(sourceArea.width, sourceArea.height, 1), destOffset, &destData));

    // Source and dest data is tightly packed
    GLuint sourceDataRowPitch = sourceArea.width * sourceTextureFormat.pixelBytes;
    GLuint destDataRowPitch   = sourceArea.width * destTextureFormat.pixelBytes;

    rx::PixelReadFunction pixelReadFunction   = sourceTextureFormat.pixelReadFunction;
    rx::PixelWriteFunction pixelWriteFunction = destTextureFormat.pixelWriteFunction;

    // Fix up the read/write functions for the sake of luminance/alpha that are emulated with
    // formats whose channels don't correspond to the original format (alpha is emulated with red,
    // and luminance/alpha is emulated with red/green).
    if (sourceVkFormat.intendedFormat().isLUMA())
    {
        pixelReadFunction = sourceVkFormat.intendedFormat().pixelReadFunction;
    }
    if (destVkFormat.intendedFormat().isLUMA())
    {
        pixelWriteFunction = destVkFormat.intendedFormat().pixelWriteFunction;
    }

    CopyImageCHROMIUM(sourceData, sourceDataRowPitch, sourceTextureFormat.pixelBytes, 0,
                      pixelReadFunction, destData, destDataRowPitch, destTextureFormat.pixelBytes,
                      0, pixelWriteFunction, destFormat.format, destFormat.componentType,
                      sourceArea.width, sourceArea.height, 1, unpackFlipY, unpackPremultiplyAlpha,
                      unpackUnmultiplyAlpha);

    return angle::Result::Continue;
}

angle::Result TextureVk::copySubImageImplWithTransfer(ContextVk *contextVk,
                                                      const gl::ImageIndex &index,
                                                      const gl::Offset &destOffset,
                                                      const vk::Format &destFormat,
                                                      size_t sourceLevel,
                                                      size_t sourceLayer,
                                                      const gl::Rectangle &sourceArea,
                                                      vk::ImageHelper *srcImage)
{
    RendererVk *renderer = contextVk->getRenderer();

    uint32_t level       = index.getLevelIndex();
    uint32_t baseLayer   = index.hasLayer() ? index.getLayerIndex() : 0;
    uint32_t layerCount  = index.getLayerCount();
    gl::Offset srcOffset = {sourceArea.x, sourceArea.y, 0};
    gl::Extents extents  = {sourceArea.width, sourceArea.height, 1};

    // Change source layout if necessary
    ANGLE_TRY(
        contextVk->onImageRead(VK_IMAGE_ASPECT_COLOR_BIT, vk::ImageLayout::TransferSrc, srcImage));

    VkImageSubresourceLayers srcSubresource = {};
    srcSubresource.aspectMask               = VK_IMAGE_ASPECT_COLOR_BIT;
    srcSubresource.mipLevel                 = static_cast<uint32_t>(sourceLevel);
    srcSubresource.baseArrayLayer           = static_cast<uint32_t>(sourceLayer);
    srcSubresource.layerCount               = layerCount;

    // If destination is valid, copy the source directly into it.
    if (mImage->valid())
    {
        // Make sure any updates to the image are already flushed.
        ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

        vk::CommandBuffer *commandBuffer;
        ANGLE_TRY(contextVk->onImageWrite(VK_IMAGE_ASPECT_COLOR_BIT, vk::ImageLayout::TransferDst,
                                          mImage));
        ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));

        VkImageSubresourceLayers destSubresource = srcSubresource;
        destSubresource.mipLevel                 = level;
        destSubresource.baseArrayLayer           = baseLayer;

        VkImageType imageType = gl_vk::GetImageType(mState.getType());
        if (imageType == VK_IMAGE_TYPE_3D)
        {
            destSubresource.baseArrayLayer = 0;
            destSubresource.layerCount     = 1;
        }

        vk::ImageHelper::Copy(srcImage, mImage, srcOffset, destOffset, extents, srcSubresource,
                              destSubresource, commandBuffer);
    }
    else
    {
        std::unique_ptr<vk::ImageHelper> stagingImage;

        // Create a temporary image to stage the copy
        stagingImage = std::make_unique<vk::ImageHelper>();

        ANGLE_TRY(stagingImage->init2DStaging(contextVk, renderer->getMemoryProperties(),
                                              gl::Extents(sourceArea.width, sourceArea.height, 1),
                                              destFormat, kTransferStagingImageFlags, layerCount));

        vk::CommandBuffer *commandBuffer;
        ANGLE_TRY(contextVk->onImageWrite(VK_IMAGE_ASPECT_COLOR_BIT, vk::ImageLayout::TransferDst,
                                          stagingImage.get()));
        ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));

        VkImageSubresourceLayers destSubresource = srcSubresource;
        destSubresource.mipLevel                 = 0;
        destSubresource.baseArrayLayer           = 0;

        vk::ImageHelper::Copy(srcImage, stagingImage.get(), srcOffset, gl::Offset(), extents,
                              srcSubresource, destSubresource, commandBuffer);

        // Stage the copy for when the image storage is actually created.
        VkImageType imageType = gl_vk::GetImageType(mState.getType());
        mImage->stageSubresourceUpdateFromImage(stagingImage.release(), index, destOffset, extents,
                                                imageType);
    }

    return angle::Result::Continue;
}

angle::Result TextureVk::copySubImageImplWithDraw(ContextVk *contextVk,
                                                  const gl::ImageIndex &index,
                                                  const gl::Offset &destOffset,
                                                  const vk::Format &destFormat,
                                                  size_t sourceLevel,
                                                  const gl::Rectangle &sourceArea,
                                                  bool isSrcFlipY,
                                                  bool unpackFlipY,
                                                  bool unpackPremultiplyAlpha,
                                                  bool unpackUnmultiplyAlpha,
                                                  vk::ImageHelper *srcImage,
                                                  const vk::ImageView *srcView)
{
    RendererVk *renderer = contextVk->getRenderer();
    UtilsVk &utilsVk     = contextVk->getUtils();

    UtilsVk::CopyImageParameters params;
    params.srcOffset[0]        = sourceArea.x;
    params.srcOffset[1]        = sourceArea.y;
    params.srcExtents[0]       = sourceArea.width;
    params.srcExtents[1]       = sourceArea.height;
    params.destOffset[0]       = destOffset.x;
    params.destOffset[1]       = destOffset.y;
    params.srcMip              = static_cast<uint32_t>(sourceLevel);
    params.srcHeight           = srcImage->getExtents().height;
    params.srcPremultiplyAlpha = unpackPremultiplyAlpha && !unpackUnmultiplyAlpha;
    params.srcUnmultiplyAlpha  = unpackUnmultiplyAlpha && !unpackPremultiplyAlpha;
    params.srcFlipY            = isSrcFlipY;
    params.destFlipY           = unpackFlipY;

    uint32_t level      = index.getLevelIndex();
    uint32_t baseLayer  = index.hasLayer() ? index.getLayerIndex() : 0;
    uint32_t layerCount = index.getLayerCount();

    // If destination is valid, copy the source directly into it.
    if (mImage->valid())
    {
        // Make sure any updates to the image are already flushed.
        ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

        for (uint32_t layerIndex = 0; layerIndex < layerCount; ++layerIndex)
        {
            params.srcLayer = layerIndex;

            const vk::ImageView *destView;
            ANGLE_TRY(getLevelLayerImageView(contextVk, level, baseLayer + layerIndex, &destView));

            ANGLE_TRY(utilsVk.copyImage(contextVk, mImage, destView, srcImage, srcView, params));
        }
    }
    else
    {
        std::unique_ptr<vk::ImageHelper> stagingImage;

        GLint samples                      = srcImage->getSamples();
        gl::TextureType stagingTextureType = vk::Get2DTextureType(layerCount, samples);

        // Create a temporary image to stage the copy
        stagingImage = std::make_unique<vk::ImageHelper>();

        ANGLE_TRY(stagingImage->init2DStaging(contextVk, renderer->getMemoryProperties(),
                                              gl::Extents(sourceArea.width, sourceArea.height, 1),
                                              destFormat, kDrawStagingImageFlags, layerCount));

        params.destOffset[0] = 0;
        params.destOffset[1] = 0;

        for (uint32_t layerIndex = 0; layerIndex < layerCount; ++layerIndex)
        {
            params.srcLayer = layerIndex;

            // Create a temporary view for this layer.
            vk::ImageView stagingView;
            ANGLE_TRY(stagingImage->initLayerImageView(
                contextVk, stagingTextureType, VK_IMAGE_ASPECT_COLOR_BIT, gl::SwizzleState(),
                &stagingView, 0, 1, layerIndex, 1));

            ANGLE_TRY(utilsVk.copyImage(contextVk, stagingImage.get(), &stagingView, srcImage,
                                        srcView, params));

            // Queue the resource for cleanup as soon as the copy above is finished.  There's no
            // need to keep it around.
            contextVk->addGarbage(&stagingView);
        }

        // Stage the copy for when the image storage is actually created.
        VkImageType imageType = gl_vk::GetImageType(mState.getType());
        mImage->stageSubresourceUpdateFromImage(stagingImage.release(), index, destOffset,
                                                gl::Extents(sourceArea.width, sourceArea.height, 1),
                                                imageType);
    }

    return angle::Result::Continue;
}

angle::Result TextureVk::setStorage(const gl::Context *context,
                                    gl::TextureType type,
                                    size_t levels,
                                    GLenum internalFormat,
                                    const gl::Extents &size)
{
    return setStorageMultisample(context, type, 1, internalFormat, size, true);
}

angle::Result TextureVk::setStorageMultisample(const gl::Context *context,
                                               gl::TextureType type,
                                               GLsizei samples,
                                               GLint internalformat,
                                               const gl::Extents &size,
                                               bool fixedSampleLocations)
{
    ContextVk *contextVk = GetAs<ContextVk>(context->getImplementation());
    RendererVk *renderer = contextVk->getRenderer();

    if (!mOwnsImage)
    {
        releaseAndDeleteImage(contextVk);
    }

    const vk::Format &format = renderer->getFormat(internalformat);
    ANGLE_TRY(ensureImageAllocated(contextVk, format));

    if (mImage->valid())
    {
        releaseImage(contextVk);
    }
    return angle::Result::Continue;
}

angle::Result TextureVk::setStorageExternalMemory(const gl::Context *context,
                                                  gl::TextureType type,
                                                  size_t levels,
                                                  GLenum internalFormat,
                                                  const gl::Extents &size,
                                                  gl::MemoryObject *memoryObject,
                                                  GLuint64 offset)
{
    ContextVk *contextVk           = vk::GetImpl(context);
    RendererVk *renderer           = contextVk->getRenderer();
    MemoryObjectVk *memoryObjectVk = vk::GetImpl(memoryObject);

    releaseAndDeleteImage(contextVk);

    const vk::Format &format = renderer->getFormat(internalFormat);

    setImageHelper(contextVk, new vk::ImageHelper(), mState.getType(), format, 0, 0, 0, true);

    ANGLE_TRY(
        memoryObjectVk->createImage(contextVk, type, levels, internalFormat, size, offset, mImage));

    gl::Format glFormat(internalFormat);
    ANGLE_TRY(initImageViews(contextVk, format, glFormat.info->sized, static_cast<uint32_t>(levels),
                             mImage->getLayerCount()));

    return angle::Result::Continue;
}

angle::Result TextureVk::setEGLImageTarget(const gl::Context *context,
                                           gl::TextureType type,
                                           egl::Image *image)
{
    ContextVk *contextVk = vk::GetImpl(context);
    RendererVk *renderer = contextVk->getRenderer();

    releaseAndDeleteImage(contextVk);

    const vk::Format &format = renderer->getFormat(image->getFormat().info->sizedInternalFormat);

    ImageVk *imageVk = vk::GetImpl(image);
    setImageHelper(contextVk, imageVk->getImage(), imageVk->getImageTextureType(), format,
                   imageVk->getImageLevel(), imageVk->getImageLayer(),
                   mState.getEffectiveBaseLevel(), false);

    ASSERT(type != gl::TextureType::CubeMap);
    ANGLE_TRY(initImageViews(contextVk, format, image->getFormat().info->sized, 1, 1));

    // Transfer the image to this queue if needed
    uint32_t rendererQueueFamilyIndex = renderer->getQueueFamilyIndex();
    if (mImage->isQueueChangeNeccesary(rendererQueueFamilyIndex))
    {
        vk::CommandBuffer *commandBuffer = nullptr;
        ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));
        mImage->changeLayoutAndQueue(VK_IMAGE_ASPECT_COLOR_BIT,
                                     vk::ImageLayout::AllGraphicsShadersReadOnly,
                                     rendererQueueFamilyIndex, commandBuffer);
    }

    return angle::Result::Continue;
}

angle::Result TextureVk::setImageExternal(const gl::Context *context,
                                          gl::TextureType type,
                                          egl::Stream *stream,
                                          const egl::Stream::GLTextureDescription &desc)
{
    ANGLE_VK_UNREACHABLE(vk::GetImpl(context));
    return angle::Result::Stop;
}

gl::ImageIndex TextureVk::getNativeImageIndex(const gl::ImageIndex &inputImageIndex) const
{
    // The input index can be a specific layer (for cube maps, 2d arrays, etc) or mImageLayerOffset
    // can be non-zero but both of these cannot be true at the same time.  EGL images can source
    // from a cube map or 3D texture but can only be a 2D destination.
    ASSERT(!(inputImageIndex.hasLayer() && mImageLayerOffset > 0));

    // handle the special-case where image index can represent a whole level of a texture
    GLint resultImageLayer = inputImageIndex.getLayerIndex();
    if (inputImageIndex.getType() != mImageNativeType)
    {
        ASSERT(!inputImageIndex.hasLayer());
        resultImageLayer = mImageLayerOffset;
    }

    return gl::ImageIndex::MakeFromType(mImageNativeType,
                                        getNativeImageLevel(inputImageIndex.getLevelIndex()),
                                        resultImageLayer, inputImageIndex.getLayerCount());
}

uint32_t TextureVk::getNativeImageLevel(uint32_t frontendLevel) const
{
    return mImageLevelOffset + frontendLevel;
}

uint32_t TextureVk::getNativeImageLayer(uint32_t frontendLayer) const
{
    return mImageLayerOffset + frontendLayer;
}

void TextureVk::releaseAndDeleteImage(ContextVk *contextVk)
{
    if (mImage)
    {
        releaseImage(contextVk);
        releaseStagingBuffer(contextVk);
        mStagingBufferObserverBinding.bind(nullptr);
        SafeDelete(mImage);
    }
}

angle::Result TextureVk::ensureImageAllocated(ContextVk *contextVk, const vk::Format &format)
{
    if (mImage == nullptr)
    {
        setImageHelper(contextVk, new vk::ImageHelper(), mState.getType(), format, 0, 0, 0, true);
    }
    else
    {
        updateImageHelper(contextVk, format);
    }

    mImageUsageFlags = VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_TRANSFER_SRC_BIT |
                       VK_IMAGE_USAGE_SAMPLED_BIT;

    // If the image has depth/stencil support, add those as possible usage.
    if (contextVk->getRenderer()->hasImageFormatFeatureBits(
            format.vkImageFormat, VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT))
    {
        mImageUsageFlags |= VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;
    }
    else if (contextVk->getRenderer()->hasImageFormatFeatureBits(
                 format.vkImageFormat, VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT))
    {
        mImageUsageFlags |= VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
    }

    return angle::Result::Continue;
}

void TextureVk::setImageHelper(ContextVk *contextVk,
                               vk::ImageHelper *imageHelper,
                               gl::TextureType imageType,
                               const vk::Format &format,
                               uint32_t imageLevelOffset,
                               uint32_t imageLayerOffset,
                               uint32_t imageBaseLevel,
                               bool selfOwned)
{
    ASSERT(mImage == nullptr);

    mStagingBufferObserverBinding.bind(imageHelper);

    mOwnsImage        = selfOwned;
    mImageNativeType  = imageType;
    mImageLevelOffset = imageLevelOffset;
    mImageLayerOffset = imageLayerOffset;
    mImage            = imageHelper;
    mImage->initStagingBuffer(contextVk->getRenderer(), format, vk::kStagingBufferFlags,
                              mStagingBufferInitialSize);

    // Force re-creation of render targets next time they are needed
    for (RenderTargetVector &renderTargetLevels : mRenderTargets)
    {
        renderTargetLevels.clear();
    }
    mRenderTargets.clear();

    mSerial = contextVk->generateTextureSerial();
}

void TextureVk::updateImageHelper(ContextVk *contextVk, const vk::Format &format)
{
    ASSERT(mImage != nullptr);
    mImage->initStagingBuffer(contextVk->getRenderer(), format, vk::kStagingBufferFlags,
                              mStagingBufferInitialSize);
}

angle::Result TextureVk::redefineImage(const gl::Context *context,
                                       const gl::ImageIndex &index,
                                       const vk::Format &format,
                                       const gl::Extents &size)
{
    ContextVk *contextVk = vk::GetImpl(context);

    if (!mOwnsImage)
    {
        releaseAndDeleteImage(contextVk);
    }

    if (mImage != nullptr)
    {
        // If there is any staged changes for this index, we can remove them since we're going to
        // override them with this call.
        mImage->removeStagedUpdates(contextVk, index);

        if (mImage->valid())
        {
            // Calculate the expected size for the index we are defining. If the size is different
            // from the given size, or the format is different, we are redefining the image so we
            // must release it.
            if (mImage->getFormat() != format || size != mImage->getSize(index))
            {
                releaseImage(contextVk);
            }
        }
    }

    if (!size.empty())
    {
        ANGLE_TRY(ensureImageAllocated(contextVk, format));
    }

    return angle::Result::Continue;
}

angle::Result TextureVk::copyImageDataToBufferAndGetData(ContextVk *contextVk,
                                                         size_t sourceLevel,
                                                         uint32_t layerCount,
                                                         const gl::Box &sourceArea,
                                                         uint8_t **outDataPtr)
{
    ANGLE_TRACE_EVENT0("gpu.angle", "TextureVk::copyImageDataToBufferAndGetData");

    // Make sure the source is initialized and it's images are flushed.
    ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

    vk::BufferHelper *copyBuffer                   = nullptr;
    vk::StagingBufferOffsetArray sourceCopyOffsets = {0, 0};
    size_t bufferSize                              = 0;

    ANGLE_TRY(mImage->copyImageDataToBuffer(contextVk, sourceLevel, layerCount, 0, sourceArea,
                                            &copyBuffer, &bufferSize, &sourceCopyOffsets,
                                            outDataPtr));

    // Explicitly finish. If new use cases arise where we don't want to block we can change this.
    ANGLE_TRY(contextVk->finishImpl());

    return angle::Result::Continue;
}

angle::Result TextureVk::copyBufferDataToImage(ContextVk *contextVk,
                                               vk::BufferHelper *srcBuffer,
                                               const gl::ImageIndex index,
                                               uint32_t rowLength,
                                               uint32_t imageHeight,
                                               const gl::Box &sourceArea,
                                               size_t offset)
{
    ANGLE_TRACE_EVENT0("gpu.angle", "TextureVk::copyBufferDataToImage");

    // Vulkan Spec requires the bufferOffset to be a multiple of 4 for vkCmdCopyBufferToImage.
    ASSERT((offset & (kBufferOffsetMultiple - 1)) == 0);

    GLuint layerCount = 0;
    GLuint layerIndex = 0;
    GetRenderTargetLayerCountAndIndex(mImage, index, &layerCount, &layerIndex);

    // Make sure the source is initialized and its images are flushed.
    ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

    vk::CommandBuffer *commandBuffer = nullptr;
    ANGLE_TRY(contextVk->onBufferRead(VK_ACCESS_TRANSFER_READ_BIT, srcBuffer));
    ANGLE_TRY(
        contextVk->onImageWrite(VK_IMAGE_ASPECT_COLOR_BIT, vk::ImageLayout::TransferDst, mImage));
    ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));

    VkBufferImageCopy region               = {};
    region.bufferOffset                    = offset;
    region.bufferRowLength                 = rowLength;
    region.bufferImageHeight               = imageHeight;
    region.imageExtent.width               = sourceArea.width;
    region.imageExtent.height              = sourceArea.height;
    region.imageExtent.depth               = sourceArea.depth;
    region.imageOffset.x                   = sourceArea.x;
    region.imageOffset.y                   = sourceArea.y;
    region.imageOffset.z                   = sourceArea.z;
    region.imageSubresource.aspectMask     = VK_IMAGE_ASPECT_COLOR_BIT;
    region.imageSubresource.baseArrayLayer = layerIndex;
    region.imageSubresource.layerCount     = 1;
    region.imageSubresource.mipLevel       = static_cast<uint32_t>(index.getLevelIndex());

    if (index.getType() == gl::TextureType::_2DArray)
    {
        region.imageExtent.depth           = 1;
        region.imageSubresource.layerCount = sourceArea.depth;
    }

    commandBuffer->copyBufferToImage(srcBuffer->getBuffer().getHandle(), mImage->getImage(),
                                     mImage->getCurrentLayout(), 1, &region);

    return angle::Result::Continue;
}

angle::Result TextureVk::generateMipmapsWithCPU(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);

    const VkExtent3D baseLevelExtents = mImage->getExtents();
    uint32_t imageLayerCount          = mImage->getLayerCount();

    uint8_t *imageData = nullptr;
    gl::Box imageArea(0, 0, 0, baseLevelExtents.width, baseLevelExtents.height,
                      baseLevelExtents.depth);

    ANGLE_TRY(copyImageDataToBufferAndGetData(contextVk, mState.getEffectiveBaseLevel(),
                                              imageLayerCount, imageArea, &imageData));

    const angle::Format &angleFormat = mImage->getFormat().actualImageFormat();
    GLuint sourceRowPitch            = baseLevelExtents.width * angleFormat.pixelBytes;
    GLuint sourceDepthPitch          = sourceRowPitch * baseLevelExtents.height;
    size_t baseLevelAllocationSize   = sourceDepthPitch * baseLevelExtents.depth;

    // We now have the base level available to be manipulated in the imageData pointer. Generate all
    // the missing mipmaps with the slow path. For each layer, use the copied data to generate all
    // the mips.
    for (GLuint layer = 0; layer < imageLayerCount; layer++)
    {
        size_t bufferOffset = layer * baseLevelAllocationSize;

        ANGLE_TRY(generateMipmapLevelsWithCPU(
            contextVk, angleFormat, layer, mState.getEffectiveBaseLevel() + 1,
            mState.getMipmapMaxLevel(), baseLevelExtents.width, baseLevelExtents.height,
            baseLevelExtents.depth, sourceRowPitch, sourceDepthPitch, imageData + bufferOffset));
    }

    vk::CommandBuffer *commandBuffer = nullptr;
    ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));
    return mImage->flushStagedUpdates(contextVk, getNativeImageLevel(0), mImage->getLevelCount(),
                                      getNativeImageLayer(0), mImage->getLayerCount(),
                                      commandBuffer);
}

angle::Result TextureVk::generateMipmap(const gl::Context *context)
{
    ContextVk *contextVk   = vk::GetImpl(context);
    RendererVk *renderer   = contextVk->getRenderer();
    bool needRedefineImage = true;

    const gl::ImageDesc &baseLevelDesc = mState.getBaseLevelDesc();

    // Some data is pending, or the image has not been defined at all yet
    if (!mImage->valid())
    {
        // Let's initialize the image so we can generate the next levels.
        if (mImage->hasStagedUpdates())
        {
            ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::FullMipChain));
            ASSERT(mImage->valid());
            needRedefineImage = false;
        }
        else
        {
            // There is nothing to generate if there is nothing uploaded so far.
            return angle::Result::Continue;
        }
    }

    // Check whether the image is already full mipmap
    if (mImage->getLevelCount() == getMipLevelCount(ImageMipLevels::FullMipChain) &&
        mImage->getBaseLevel() == mState.getEffectiveBaseLevel())
    {
        needRedefineImage = false;
    }

    if (needRedefineImage)
    {
        // Flush update if needed.
        if (mImage->hasStagedUpdates())
        {
            vk::CommandBuffer *commandBuffer = nullptr;
            mImage->retain(&contextVk->getResourceUseList());
            ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));
            ANGLE_TRY(mImage->flushStagedUpdates(contextVk, getNativeImageLevel(0),
                                                 mImage->getLevelCount(), getNativeImageLayer(0),
                                                 mImage->getLayerCount(), commandBuffer));
        }

        // Redefine the images with mipmaps.
        // Copy image to the staging buffer and stage an update to the new one.
        ANGLE_TRY(copyAndStageImageSubresource(contextVk, baseLevelDesc, false,
                                               getNativeImageLayer(0), 0, mImage->getBaseLevel()));

        // Release the origin image and recreate it with new mipmap counts.
        releaseImage(contextVk);

        mImage->retain(&contextVk->getResourceUseList());

        ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::FullMipChain));
    }
    // Check if the image supports blit. If it does, we can do the mipmap generation on the gpu
    // only.
    if (renderer->hasImageFormatFeatureBits(mImage->getFormat().vkImageFormat, kBlitFeatureFlags))
    {
        ANGLE_TRY(mImage->generateMipmapsWithBlit(
            contextVk, mState.getMipmapMaxLevel() - mState.getEffectiveBaseLevel()));
    }
    else
    {
        ANGLE_TRY(generateMipmapsWithCPU(context));
    }

    return angle::Result::Continue;
}

angle::Result TextureVk::copyAndStageImageSubresource(ContextVk *contextVk,
                                                      const gl::ImageDesc &desc,
                                                      bool ignoreLayerCount,
                                                      uint32_t currentLayer,
                                                      uint32_t sourceMipLevel,
                                                      uint32_t stagingDstMipLevel)
{
    const gl::Extents &baseLevelExtents = desc.size;

    VkExtent3D updatedExtents;
    VkOffset3D offset = {};
    uint32_t layerCount;
    gl_vk::GetExtentsAndLayerCount(mState.getType(), baseLevelExtents, &updatedExtents,
                                   &layerCount);
    gl::Box area(offset.x, offset.y, offset.z, updatedExtents.width, updatedExtents.height,
                 updatedExtents.depth);
    // TODO: Refactor TextureVk::changeLevels() to avoid this workaround.
    if (ignoreLayerCount)
    {
        layerCount = 1;
    }

    // Copy from the base level image to the staging buffer
    vk::BufferHelper *stagingBuffer                   = nullptr;
    vk::StagingBufferOffsetArray stagingBufferOffsets = {0, 0};
    size_t bufferSize                                 = 0;
    ANGLE_TRY(mImage->copyImageDataToBuffer(contextVk, sourceMipLevel, layerCount, currentLayer,
                                            area, &stagingBuffer, &bufferSize,
                                            &stagingBufferOffsets, nullptr));

    // Stage an update to the new image
    ASSERT(stagingBuffer);
    ANGLE_TRY(mImage->stageSubresourceUpdateFromBuffer(
        contextVk, bufferSize, stagingDstMipLevel, currentLayer, layerCount, updatedExtents, offset,
        stagingBuffer, stagingBufferOffsets));

    return angle::Result::Continue;
}

angle::Result TextureVk::setBaseLevel(const gl::Context *context, GLuint baseLevel)
{
    return angle::Result::Continue;
}

angle::Result TextureVk::updateBaseMaxLevels(ContextVk *contextVk,
                                             GLuint baseLevel,
                                             GLuint maxLevel)
{
    if (!mImage)
    {
        return angle::Result::Continue;
    }

    // Track the previous levels for use in update loop below
    uint32_t previousBaseLevel = mImage->getBaseLevel();

    bool baseLevelChanged = baseLevel != previousBaseLevel;
    bool maxLevelChanged  = (mImage->getLevelCount() + previousBaseLevel) != (maxLevel + 1);

    if (!(baseLevelChanged || maxLevelChanged))
    {
        // This scenario is a noop, most likely maxLevel has been lowered to a level that already
        // reflects the current state of the image
        return angle::Result::Continue;
    }

    if (!mImage->valid())
    {
        // Track the levels in our ImageHelper
        mImage->setBaseAndMaxLevels(baseLevel, maxLevel);

        // No further work to do, let staged updates handle the new levels
        return angle::Result::Continue;
    }

    return changeLevels(contextVk, previousBaseLevel, baseLevel, maxLevel);
}

angle::Result TextureVk::changeLevels(ContextVk *contextVk,
                                      GLuint previousBaseLevel,
                                      GLuint baseLevel,
                                      GLuint maxLevel)
{
    // Recreate the image to reflect new base or max levels.
    // First, flush any pending updates so we have good data in the existing vkImage
    if (mImage->valid() && mImage->hasStagedUpdates())
    {
        vk::CommandBuffer *commandBuffer = nullptr;
        ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));
        ANGLE_TRY(mImage->flushStagedUpdates(contextVk, getNativeImageLevel(0),
                                             mImage->getLevelCount(), getNativeImageLayer(0),
                                             mImage->getLayerCount(), commandBuffer));
    }

    bool baseLevelChanged = baseLevel != previousBaseLevel;

    // After flushing, track the new levels (they are used in the flush, hence the wait)
    mImage->setBaseAndMaxLevels(baseLevel, maxLevel);

    // Next, back up any data we need to preserve by staging it as updates to the new image.

    // Stage updates for all levels in the GL texture, while preserving the data in the vkImage.
    // This ensures we propagate all the current image data, even as max level moves around.
    uint32_t updateCount =
        std::max<GLuint>(mState.getMipmapMaxLevel() + 1, mImage->getLevelCount());

    // The staged updates won't be applied until the image has the requisite mip levels
    for (uint32_t layer = 0; layer < mImage->getLayerCount(); layer++)
    {
        for (uint32_t level = 0; level < updateCount; level++)
        {
            if (mImage->isUpdateStaged(level, layer))
            {
                // If there is still an update staged for the surface at the designated
                // layer/level, we don't need to propagate any data from this image.
                // This can happen for original texture levels that have never fit into
                // the vkImage due to base/max level, and for vkImage data that has been
                // staged by previous calls to changeLevels that didn't fit into the
                // new vkImage.
                continue;
            }

            // Pull data from the current image and stage it as an update for the new image

            // First we populate the staging buffer with current level data
            const gl::ImageDesc &desc =
                mState.getImageDesc(gl::TextureTypeToTarget(mState.getType(), layer), level);

            // We need to adjust the source Vulkan level to reflect the previous base level.
            // vk level 0 previously aligned with whatever the base level was.
            uint32_t srcLevelVK = baseLevelChanged ? level - previousBaseLevel : level;
            ASSERT(srcLevelVK <= mImage->getLevelCount());

            ANGLE_TRY(
                copyAndStageImageSubresource(contextVk, desc, true, layer, srcLevelVK, level));
        }
    }

    // Now that we've staged all the updates, release the current image so that it will be
    // recreated with the correct number of mip levels, base level, and max level.
    releaseImage(contextVk);

    mImage->retain(&contextVk->getResourceUseList());

    return angle::Result::Continue;
}

angle::Result TextureVk::bindTexImage(const gl::Context *context, egl::Surface *surface)
{
    ContextVk *contextVk = vk::GetImpl(context);
    RendererVk *renderer = contextVk->getRenderer();

    releaseAndDeleteImage(contextVk);

    GLenum internalFormat    = surface->getConfig()->renderTargetFormat;
    const vk::Format &format = renderer->getFormat(internalFormat);

    // eglBindTexImage can only be called with pbuffer (offscreen) surfaces
    OffscreenSurfaceVk *offscreenSurface = GetImplAs<OffscreenSurfaceVk>(surface);
    setImageHelper(contextVk, offscreenSurface->getColorAttachmentImage(), mState.getType(), format,
                   surface->getMipmapLevel(), 0, mState.getEffectiveBaseLevel(), false);

    ASSERT(mImage->getLayerCount() == 1);
    gl::Format glFormat(internalFormat);
    return initImageViews(contextVk, format, glFormat.info->sized, 1, 1);
}

angle::Result TextureVk::releaseTexImage(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);

    releaseImage(contextVk);

    return angle::Result::Continue;
}

angle::Result TextureVk::getAttachmentRenderTarget(const gl::Context *context,
                                                   GLenum binding,
                                                   const gl::ImageIndex &imageIndex,
                                                   GLsizei samples,
                                                   FramebufferAttachmentRenderTarget **rtOut)
{
    ASSERT(imageIndex.getLevelIndex() >= 0);

    ContextVk *contextVk = vk::GetImpl(context);
    ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

    GLuint layerIndex = 0, layerCount = 0;
    GetRenderTargetLayerCountAndIndex(mImage, imageIndex, &layerCount, &layerIndex);

    ANGLE_TRY(initRenderTargets(contextVk, layerCount, imageIndex.getLevelIndex()));

    ASSERT(imageIndex.getLevelIndex() < static_cast<int32_t>(mRenderTargets.size()));
    *rtOut = &mRenderTargets[imageIndex.getLevelIndex()][layerIndex];

    return angle::Result::Continue;
}

angle::Result TextureVk::ensureImageInitialized(ContextVk *contextVk, ImageMipLevels mipLevels)
{
    const gl::ImageDesc &baseLevelDesc  = mState.getBaseLevelDesc();
    const gl::Extents &baseLevelExtents = baseLevelDesc.size;
    const uint32_t levelCount           = getMipLevelCount(mipLevels);
    const vk::Format &format            = getBaseLevelFormat(contextVk->getRenderer());
    return ensureImageInitializedImpl(contextVk, baseLevelExtents, levelCount, format);
}

angle::Result TextureVk::ensureImageInitializedImpl(ContextVk *contextVk,
                                                    const gl::Extents &baseLevelExtents,
                                                    uint32_t levelCount,
                                                    const vk::Format &format)
{
    if (mImage->valid() && !mImage->hasStagedUpdates())
    {
        return angle::Result::Continue;
    }

    if (!mImage->valid())
    {
        const gl::ImageDesc &baseLevelDesc = mState.getBaseLevelDesc();

        ANGLE_TRY(initImage(contextVk, format, baseLevelDesc.format.info->sized, baseLevelExtents,
                            levelCount));
    }

    vk::CommandBuffer *commandBuffer = nullptr;
    ANGLE_TRY(contextVk->endRenderPassAndGetCommandBuffer(&commandBuffer));
    return mImage->flushStagedUpdates(contextVk, getNativeImageLevel(0), mImage->getLevelCount(),
                                      getNativeImageLayer(0), mImage->getLayerCount(),
                                      commandBuffer);
}

angle::Result TextureVk::initRenderTargets(ContextVk *contextVk,
                                           GLuint layerCount,
                                           GLuint levelIndex)
{
    if (mRenderTargets.size() <= levelIndex)
    {
        mRenderTargets.resize(levelIndex + 1);
    }

    // Lazy init. Check if already initialized.
    if (!mRenderTargets[levelIndex].empty())
        return angle::Result::Continue;

    mRenderTargets[levelIndex].resize(layerCount);

    for (uint32_t layerIndex = 0; layerIndex < layerCount; ++layerIndex)
    {
        mRenderTargets[levelIndex][layerIndex].init(
            mImage, &mImageViews, getNativeImageLevel(levelIndex), getNativeImageLayer(layerIndex));
    }
    return angle::Result::Continue;
}

angle::Result TextureVk::syncState(const gl::Context *context,
                                   const gl::Texture::DirtyBits &dirtyBits)
{
    ContextVk *contextVk = vk::GetImpl(context);

    // Create a new image if the storage state is enabled for the first time.
    if (dirtyBits.test(gl::Texture::DIRTY_BIT_BOUND_AS_IMAGE))
    {
        // Recreate the image to include storage bit if needed.
        if (!(mImageUsageFlags & VK_IMAGE_USAGE_STORAGE_BIT))
        {
            mImageUsageFlags |= VK_IMAGE_USAGE_STORAGE_BIT;
            ANGLE_TRY(changeLevels(contextVk, mImage->getBaseLevel(),
                                   mState.getEffectiveBaseLevel(), mState.getEffectiveMaxLevel()));
        }
    }

    // Set base and max level before initializing the image
    if (dirtyBits.test(gl::Texture::DIRTY_BIT_MAX_LEVEL) ||
        dirtyBits.test(gl::Texture::DIRTY_BIT_BASE_LEVEL))
    {
        ANGLE_TRY(updateBaseMaxLevels(contextVk, mState.getEffectiveBaseLevel(),
                                      mState.getEffectiveMaxLevel()));
    }

    // Initialize the image storage and flush the pixel buffer.
    ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));

    if (dirtyBits.none() && mSampler.valid())
    {
        return angle::Result::Continue;
    }

    RendererVk *renderer = contextVk->getRenderer();
    if (mSampler.valid())
    {
        mSampler.release(renderer);
    }

    if (dirtyBits.test(gl::Texture::DIRTY_BIT_SWIZZLE_RED) ||
        dirtyBits.test(gl::Texture::DIRTY_BIT_SWIZZLE_GREEN) ||
        dirtyBits.test(gl::Texture::DIRTY_BIT_SWIZZLE_BLUE) ||
        dirtyBits.test(gl::Texture::DIRTY_BIT_SWIZZLE_ALPHA))
    {
        if (mImage && mImage->valid())
        {
            // We use a special layer count here to handle EGLImages. They might only be
            // looking at one layer of a cube or 2D array texture.
            uint32_t layerCount =
                mState.getType() == gl::TextureType::_2D ? 1 : mImage->getLayerCount();

            mImageViews.release(renderer);
            const gl::ImageDesc &baseLevelDesc = mState.getBaseLevelDesc();

            ANGLE_TRY(initImageViews(contextVk, mImage->getFormat(),
                                     baseLevelDesc.format.info->sized, mImage->getLevelCount(),
                                     layerCount));
        }
    }

    const gl::Extensions &extensions     = renderer->getNativeExtensions();
    const gl::SamplerState &samplerState = mState.getSamplerState();

    float maxAnisotropy   = samplerState.getMaxAnisotropy();
    bool anisotropyEnable = extensions.textureFilterAnisotropic && maxAnisotropy > 1.0f;
    bool compareEnable    = samplerState.getCompareMode() == GL_COMPARE_REF_TO_TEXTURE;
    VkCompareOp compareOp = gl_vk::GetCompareOp(samplerState.getCompareFunc());
    // When sampling from stencil, deqp tests expect texture compare to have no effect
    // dEQP - GLES31.functional.stencil_texturing.misc.compare_mode_effect
    // states: NOTE: Texture compare mode has no effect when reading stencil values.
    if (mState.isStencilMode())
    {
        compareEnable = VK_FALSE;
        compareOp     = VK_COMPARE_OP_ALWAYS;
    }

    // Create a simple sampler. Force basic parameter settings.
    VkSamplerCreateInfo samplerInfo     = {};
    samplerInfo.sType                   = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
    samplerInfo.flags                   = 0;
    samplerInfo.magFilter               = gl_vk::GetFilter(samplerState.getMagFilter());
    samplerInfo.minFilter               = gl_vk::GetFilter(samplerState.getMinFilter());
    samplerInfo.mipmapMode              = gl_vk::GetSamplerMipmapMode(samplerState.getMinFilter());
    samplerInfo.addressModeU            = gl_vk::GetSamplerAddressMode(samplerState.getWrapS());
    samplerInfo.addressModeV            = gl_vk::GetSamplerAddressMode(samplerState.getWrapT());
    samplerInfo.addressModeW            = gl_vk::GetSamplerAddressMode(samplerState.getWrapR());
    samplerInfo.mipLodBias              = 0.0f;
    samplerInfo.anisotropyEnable        = anisotropyEnable;
    samplerInfo.maxAnisotropy           = maxAnisotropy;
    samplerInfo.compareEnable           = compareEnable;
    samplerInfo.compareOp               = compareOp;
    samplerInfo.minLod                  = samplerState.getMinLod();
    samplerInfo.maxLod                  = samplerState.getMaxLod();
    samplerInfo.borderColor             = VK_BORDER_COLOR_INT_TRANSPARENT_BLACK;
    samplerInfo.unnormalizedCoordinates = VK_FALSE;

    if (!gl::IsMipmapFiltered(samplerState))
    {
        // Per the Vulkan spec, GL_NEAREST and GL_LINEAR do not map directly to Vulkan, so
        // they must be emulated (See "Mapping of OpenGL to Vulkan filter modes")
        samplerInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_NEAREST;
        samplerInfo.minLod     = 0.0f;
        samplerInfo.maxLod     = 0.25f;
    }

    ANGLE_VK_TRY(contextVk, mSampler.get().init(contextVk->getDevice(), samplerInfo));

    // Regenerate the serial on a sampler change.
    mSerial = contextVk->generateTextureSerial();

    return angle::Result::Continue;
}

angle::Result TextureVk::initializeContents(const gl::Context *context,
                                            const gl::ImageIndex &imageIndex)
{
    ContextVk *contextVk      = vk::GetImpl(context);
    const gl::ImageDesc &desc = mState.getImageDesc(imageIndex);
    const vk::Format &format =
        contextVk->getRenderer()->getFormat(desc.format.info->sizedInternalFormat);

    ASSERT(mImage);
    mImage->stageRobustResourceClear(imageIndex, format);

    // Note that we cannot ensure the image is initialized because we might be calling subImage
    // on a non-complete cube map.
    return angle::Result::Continue;
}

void TextureVk::releaseOwnershipOfImage(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);

    mOwnsImage = false;
    releaseAndDeleteImage(contextVk);
}

const vk::ImageView &TextureVk::getReadImageViewAndRecordUse(ContextVk *contextVk) const
{
    ASSERT(mImage->valid());

    mImageViews.retain(&contextVk->getResourceUseList());

    if (mState.isStencilMode() && mImageViews.hasStencilReadImageView())
    {
        return mImageViews.getStencilReadImageView();
    }

    return mImageViews.getReadImageView();
}

const vk::ImageView &TextureVk::getFetchImageViewAndRecordUse(ContextVk *contextVk) const
{
    ASSERT(mImage->valid());

    mImageViews.retain(&contextVk->getResourceUseList());

    // We don't currently support fetch for depth/stencil cube map textures.
    ASSERT(!mImageViews.hasStencilReadImageView() || !mImageViews.hasFetchImageView());
    return (mImageViews.hasFetchImageView() ? mImageViews.getFetchImageView()
                                            : mImageViews.getReadImageView());
}

angle::Result TextureVk::getLevelLayerImageView(ContextVk *contextVk,
                                                size_t level,
                                                size_t layer,
                                                const vk::ImageView **imageViewOut)
{
    ASSERT(mImage && mImage->valid());

    uint32_t nativeLevel = getNativeImageLevel(static_cast<uint32_t>(level));
    uint32_t nativeLayer = getNativeImageLayer(static_cast<uint32_t>(layer));

    return mImageViews.getLevelLayerDrawImageView(contextVk, *mImage, nativeLevel, nativeLayer,
                                                  imageViewOut);
}

angle::Result TextureVk::getStorageImageView(ContextVk *contextVk,
                                             bool allLayers,
                                             size_t level,
                                             size_t singleLayer,
                                             const vk::ImageView **imageViewOut)
{
    if (!allLayers)
    {
        return getLevelLayerImageView(contextVk, level, singleLayer, imageViewOut);
    }

    uint32_t nativeLevel = getNativeImageLevel(static_cast<uint32_t>(level));
    uint32_t nativeLayer = getNativeImageLayer(0);
    return mImageViews.getLevelDrawImageView(contextVk, mState.getType(), *mImage, nativeLevel,
                                             nativeLayer, imageViewOut);
}

angle::Result TextureVk::initImage(ContextVk *contextVk,
                                   const vk::Format &format,
                                   const bool sized,
                                   const gl::Extents &extents,
                                   const uint32_t levelCount)
{
    RendererVk *renderer = contextVk->getRenderer();

    VkExtent3D vkExtent;
    uint32_t layerCount;
    gl_vk::GetExtentsAndLayerCount(mState.getType(), extents, &vkExtent, &layerCount);
    GLint samples = mState.getBaseLevelDesc().samples ? mState.getBaseLevelDesc().samples : 1;

    ANGLE_TRY(mImage->init(contextVk, mState.getType(), vkExtent, format, samples, mImageUsageFlags,
                           mState.getEffectiveBaseLevel(), mState.getEffectiveMaxLevel(),
                           levelCount, layerCount));

    const VkMemoryPropertyFlags flags = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;

    ANGLE_TRY(mImage->initMemory(contextVk, renderer->getMemoryProperties(), flags));

    ANGLE_TRY(initImageViews(contextVk, format, sized, levelCount, layerCount));

    mSerial = contextVk->generateTextureSerial();

    return angle::Result::Continue;
}

angle::Result TextureVk::initImageViews(ContextVk *contextVk,
                                        const vk::Format &format,
                                        const bool sized,
                                        uint32_t levelCount,
                                        uint32_t layerCount)
{
    ASSERT(mImage != nullptr && mImage->valid());

    // TODO(cnorthrop): May be missing non-zero base level http://anglebug.com/3948
    uint32_t baseLevel = getNativeImageLevel(0);
    uint32_t baseLayer = getNativeImageLayer(0);

    gl::SwizzleState mappedSwizzle;
    MapSwizzleState(contextVk, format, sized, mState.getSwizzleState(), &mappedSwizzle);

    return mImageViews.initReadViews(contextVk, mState.getType(), *mImage, format, mappedSwizzle,
                                     baseLevel, levelCount, baseLayer, layerCount);
}

void TextureVk::releaseImage(ContextVk *contextVk)
{
    RendererVk *renderer = contextVk->getRenderer();

    if (mImage)
    {
        if (mOwnsImage)
        {
            mImage->releaseImage(renderer);
        }
        else
        {
            mStagingBufferObserverBinding.bind(nullptr);
            mImage = nullptr;
        }
    }

    mImageViews.release(renderer);

    for (RenderTargetVector &renderTargetLevels : mRenderTargets)
    {
        // Clear the layers tracked for each level
        renderTargetLevels.clear();
    }
    // Then clear the levels
    mRenderTargets.clear();

    onStateChange(angle::SubjectMessage::SubjectChanged);
}

void TextureVk::releaseStagingBuffer(ContextVk *contextVk)
{
    if (mImage)
    {
        mImage->releaseStagingBuffer(contextVk->getRenderer());
    }
}

uint32_t TextureVk::getMipLevelCount(ImageMipLevels mipLevels) const
{
    switch (mipLevels)
    {
        case ImageMipLevels::EnabledLevels:
            return mState.getEnabledLevelCount();
        case ImageMipLevels::FullMipChain:
            return getMaxLevelCount() - mState.getEffectiveBaseLevel();

        default:
            UNREACHABLE();
            return 0;
    }
}

uint32_t TextureVk::getMaxLevelCount() const
{
    // getMipmapMaxLevel will be 0 here if mipmaps are not used, so the levelCount is always +1.
    return mState.getMipmapMaxLevel() + 1;
}

angle::Result TextureVk::generateMipmapLevelsWithCPU(ContextVk *contextVk,
                                                     const angle::Format &sourceFormat,
                                                     GLuint layer,
                                                     GLuint firstMipLevel,
                                                     GLuint maxMipLevel,
                                                     const size_t sourceWidth,
                                                     const size_t sourceHeight,
                                                     const size_t sourceDepth,
                                                     const size_t sourceRowPitch,
                                                     const size_t sourceDepthPitch,
                                                     uint8_t *sourceData)
{
    size_t previousLevelWidth      = sourceWidth;
    size_t previousLevelHeight     = sourceHeight;
    size_t previousLevelDepth      = sourceDepth;
    uint8_t *previousLevelData     = sourceData;
    size_t previousLevelRowPitch   = sourceRowPitch;
    size_t previousLevelDepthPitch = sourceDepthPitch;

    for (GLuint currentMipLevel = firstMipLevel; currentMipLevel <= maxMipLevel; currentMipLevel++)
    {
        // Compute next level width and height.
        size_t mipWidth  = std::max<size_t>(1, previousLevelWidth >> 1);
        size_t mipHeight = std::max<size_t>(1, previousLevelHeight >> 1);
        size_t mipDepth  = std::max<size_t>(1, previousLevelDepth >> 1);

        // With the width and height of the next mip, we can allocate the next buffer we need.
        uint8_t *destData     = nullptr;
        size_t destRowPitch   = mipWidth * sourceFormat.pixelBytes;
        size_t destDepthPitch = destRowPitch * mipHeight;

        size_t mipAllocationSize = destDepthPitch * mipDepth;
        gl::Extents mipLevelExtents(static_cast<int>(mipWidth), static_cast<int>(mipHeight),
                                    static_cast<int>(mipDepth));

        ANGLE_TRY(mImage->stageSubresourceUpdateAndGetData(
            contextVk, mipAllocationSize,
            gl::ImageIndex::MakeFromType(mState.getType(), currentMipLevel, layer), mipLevelExtents,
            gl::Offset(), &destData));

        // Generate the mipmap into that new buffer
        sourceFormat.mipGenerationFunction(
            previousLevelWidth, previousLevelHeight, previousLevelDepth, previousLevelData,
            previousLevelRowPitch, previousLevelDepthPitch, destData, destRowPitch, destDepthPitch);

        // Swap for the next iteration
        previousLevelWidth      = mipWidth;
        previousLevelHeight     = mipHeight;
        previousLevelDepth      = mipDepth;
        previousLevelData       = destData;
        previousLevelRowPitch   = destRowPitch;
        previousLevelDepthPitch = destDepthPitch;
    }

    return angle::Result::Continue;
}

const gl::InternalFormat &TextureVk::getImplementationSizedFormat(const gl::Context *context) const
{
    GLenum sizedFormat = GL_NONE;

    if (mImage && mImage->valid())
    {
        sizedFormat = mImage->getFormat().actualImageFormat().glInternalFormat;
    }
    else
    {
        ContextVk *contextVk     = vk::GetImpl(context);
        const vk::Format &format = getBaseLevelFormat(contextVk->getRenderer());
        sizedFormat              = format.actualImageFormat().glInternalFormat;
    }

    return gl::GetSizedInternalFormatInfo(sizedFormat);
}

GLenum TextureVk::getColorReadFormat(const gl::Context *context)
{
    const gl::InternalFormat &sizedFormat = getImplementationSizedFormat(context);
    return sizedFormat.format;
}

GLenum TextureVk::getColorReadType(const gl::Context *context)
{
    const gl::InternalFormat &sizedFormat = getImplementationSizedFormat(context);
    return sizedFormat.type;
}

angle::Result TextureVk::getTexImage(const gl::Context *context,
                                     const gl::PixelPackState &packState,
                                     gl::Buffer *packBuffer,
                                     gl::TextureTarget target,
                                     GLint level,
                                     GLenum format,
                                     GLenum type,
                                     void *pixels)
{
    ContextVk *contextVk = vk::GetImpl(context);

    // Assumes Texture is consistent.
    // TODO(http://anglebug.com/4058): Handle incomplete textures.
    if (!mImage || !mImage->valid())
    {
        ANGLE_TRY(ensureImageInitialized(contextVk, ImageMipLevels::EnabledLevels));
    }

    size_t layer =
        gl::IsCubeMapFaceTarget(target) ? gl::CubeMapTextureTargetToFaceIndex(target) : 0;
    return mImage->readPixelsForGetImage(contextVk, packState, packBuffer, level,
                                         static_cast<uint32_t>(layer), format, type, pixels);
}

const vk::Format &TextureVk::getBaseLevelFormat(RendererVk *renderer) const
{
    const gl::ImageDesc &baseLevelDesc = mState.getBaseLevelDesc();
    return renderer->getFormat(baseLevelDesc.format.info->sizedInternalFormat);
}

void TextureVk::onSubjectStateChange(angle::SubjectIndex index, angle::SubjectMessage message)
{
    ASSERT(index == kStagingBufferSubjectIndex && message == angle::SubjectMessage::SubjectChanged);

    // Forward the notification to vk::Texture that the staging buffer changed.
    onStateChange(angle::SubjectMessage::SubjectChanged);
}
}  // namespace rx