Add m-esr52 at 52.6.0

1 files changed, 643 insertions, 0 deletions

diff --git a/gfx/angle/src/libANGLE/renderer/d3d/d3d11/Image11.cpp b/gfx/angle/src/libANGLE/renderer/d3d/d3d11/Image11.cpp
new file mode 100755
index 000000000..3c797f820
--- /dev/null
+++ b/gfx/angle/src/libANGLE/renderer/d3d/d3d11/Image11.cpp
@@ -0,0 +1,643 @@
+//
+// Copyright (c) 2012 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.
+//
+
+// Image11.h: Implements the rx::Image11 class, which acts as the interface to
+// the actual underlying resources of a Texture
+
+#include "libANGLE/renderer/d3d/d3d11/Image11.h"
+
+#include "common/utilities.h"
+#include "libANGLE/formatutils.h"
+#include "libANGLE/Framebuffer.h"
+#include "libANGLE/FramebufferAttachment.h"
+#include "libANGLE/renderer/d3d/d3d11/formatutils11.h"
+#include "libANGLE/renderer/d3d/d3d11/Renderer11.h"
+#include "libANGLE/renderer/d3d/d3d11/renderer11_utils.h"
+#include "libANGLE/renderer/d3d/d3d11/RenderTarget11.h"
+#include "libANGLE/renderer/d3d/d3d11/texture_format_table.h"
+#include "libANGLE/renderer/d3d/d3d11/TextureStorage11.h"
+
+namespace rx
+{
+
+Image11::Image11(Renderer11 *renderer)
+    : mRenderer(renderer),
+      mDXGIFormat(DXGI_FORMAT_UNKNOWN),
+      mStagingTexture(NULL),
+      mStagingSubresource(0),
+      mRecoverFromStorage(false),
+      mAssociatedStorage(NULL),
+      mAssociatedImageIndex(gl::ImageIndex::MakeInvalid()),
+      mRecoveredFromStorageCount(0)
+{
+}
+
+Image11::~Image11()
+{
+    disassociateStorage();
+    releaseStagingTexture();
+}
+
+gl::Error Image11::generateMipmap(Image11 *dest,
+                                  Image11 *src,
+                                  const Renderer11DeviceCaps &rendererCaps)
+{
+    ASSERT(src->getDXGIFormat() == dest->getDXGIFormat());
+    ASSERT(src->getWidth() == 1 || src->getWidth() / 2 == dest->getWidth());
+    ASSERT(src->getHeight() == 1 || src->getHeight() / 2 == dest->getHeight());
+
+    D3D11_MAPPED_SUBRESOURCE destMapped;
+    ANGLE_TRY(dest->map(D3D11_MAP_WRITE, &destMapped));
+
+    D3D11_MAPPED_SUBRESOURCE srcMapped;
+    gl::Error error = src->map(D3D11_MAP_READ, &srcMapped);
+    if (error.isError())
+    {
+        dest->unmap();
+        return error;
+    }
+
+    const uint8_t *sourceData = reinterpret_cast<const uint8_t *>(srcMapped.pData);
+    uint8_t *destData         = reinterpret_cast<uint8_t *>(destMapped.pData);
+
+    auto mipGenerationFunction =
+        d3d11::Format::Get(src->getInternalFormat(), rendererCaps).format().mipGenerationFunction;
+    mipGenerationFunction(src->getWidth(), src->getHeight(), src->getDepth(), sourceData,
+                          srcMapped.RowPitch, srcMapped.DepthPitch, destData, destMapped.RowPitch,
+                          destMapped.DepthPitch);
+
+    dest->unmap();
+    src->unmap();
+
+    dest->markDirty();
+
+    return gl::NoError();
+}
+
+bool Image11::isDirty() const
+{
+    // If mDirty is true AND mStagingTexture doesn't exist AND mStagingTexture doesn't need to be
+    // recovered from TextureStorage AND the texture doesn't require init data (i.e. a blank new
+    // texture will suffice) then isDirty should still return false.
+    if (mDirty && !mStagingTexture && !mRecoverFromStorage)
+    {
+        const Renderer11DeviceCaps &deviceCaps = mRenderer->getRenderer11DeviceCaps();
+        const auto &formatInfo                 = d3d11::Format::Get(mInternalFormat, deviceCaps);
+        if (formatInfo.dataInitializerFunction == nullptr)
+        {
+            return false;
+        }
+    }
+
+    return mDirty;
+}
+
+gl::Error Image11::copyToStorage(TextureStorage *storage,
+                                 const gl::ImageIndex &index,
+                                 const gl::Box &region)
+{
+    TextureStorage11 *storage11 = GetAs<TextureStorage11>(storage);
+
+    // If an app's behavior results in an Image11 copying its data to/from to a TextureStorage
+    // multiple times, then we should just keep the staging texture around to prevent the copying
+    // from impacting perf. We allow the Image11 to copy its data to/from TextureStorage once. This
+    // accounts for an app making a late call to glGenerateMipmap.
+    bool attemptToReleaseStagingTexture = (mRecoveredFromStorageCount < 2);
+
+    if (attemptToReleaseStagingTexture)
+    {
+        // If another image is relying on this Storage for its data, then we must let it recover its
+        // data before we overwrite it.
+        ANGLE_TRY(storage11->releaseAssociatedImage(index, this));
+    }
+
+    ID3D11Resource *stagingTexture       = NULL;
+    unsigned int stagingSubresourceIndex = 0;
+    ANGLE_TRY(getStagingTexture(&stagingTexture, &stagingSubresourceIndex));
+    ANGLE_TRY(
+        storage11->updateSubresourceLevel(stagingTexture, stagingSubresourceIndex, index, region));
+
+    // Once the image data has been copied into the Storage, we can release it locally.
+    if (attemptToReleaseStagingTexture)
+    {
+        storage11->associateImage(this, index);
+        releaseStagingTexture();
+        mRecoverFromStorage   = true;
+        mAssociatedStorage    = storage11;
+        mAssociatedImageIndex = index;
+    }
+
+    return gl::NoError();
+}
+
+bool Image11::isAssociatedStorageValid(TextureStorage11 *textureStorage) const
+{
+    return (mAssociatedStorage == textureStorage);
+}
+
+gl::Error Image11::recoverFromAssociatedStorage()
+{
+    if (mRecoverFromStorage)
+    {
+        ANGLE_TRY(createStagingTexture());
+
+        bool textureStorageCorrect =
+            mAssociatedStorage->isAssociatedImageValid(mAssociatedImageIndex, this);
+
+        // This means that the cached TextureStorage has been modified after this Image11 released
+        // its copy of its data. This should not have happened. The TextureStorage should have told
+        // this Image11 to recover its data before it was overwritten.
+        ASSERT(textureStorageCorrect);
+
+        if (textureStorageCorrect)
+        {
+            // CopySubResource from the Storage to the Staging texture
+            gl::Box region(0, 0, 0, mWidth, mHeight, mDepth);
+            ANGLE_TRY(mAssociatedStorage->copySubresourceLevel(mStagingTexture, mStagingSubresource,
+                                                               mAssociatedImageIndex, region));
+            mRecoveredFromStorageCount += 1;
+        }
+
+        // Reset all the recovery parameters, even if the texture storage association is broken.
+        disassociateStorage();
+    }
+
+    return gl::NoError();
+}
+
+void Image11::disassociateStorage()
+{
+    if (mRecoverFromStorage)
+    {
+        // Make the texturestorage release the Image11 too
+        mAssociatedStorage->disassociateImage(mAssociatedImageIndex, this);
+
+        mRecoverFromStorage   = false;
+        mAssociatedStorage    = NULL;
+        mAssociatedImageIndex = gl::ImageIndex::MakeInvalid();
+    }
+}
+
+bool Image11::redefine(GLenum target,
+                       GLenum internalformat,
+                       const gl::Extents &size,
+                       bool forceRelease)
+{
+    if (mWidth != size.width || mHeight != size.height || mInternalFormat != internalformat ||
+        forceRelease)
+    {
+        // End the association with the TextureStorage, since that data will be out of date.
+        // Also reset mRecoveredFromStorageCount since this Image is getting completely redefined.
+        disassociateStorage();
+        mRecoveredFromStorageCount = 0;
+
+        mWidth          = size.width;
+        mHeight         = size.height;
+        mDepth          = size.depth;
+        mInternalFormat = internalformat;
+        mTarget         = target;
+
+        // compute the d3d format that will be used
+        const d3d11::Format &formatInfo =
+            d3d11::Format::Get(internalformat, mRenderer->getRenderer11DeviceCaps());
+        mDXGIFormat = formatInfo.texFormat;
+        mRenderable = (formatInfo.rtvFormat != DXGI_FORMAT_UNKNOWN);
+
+        releaseStagingTexture();
+        mDirty = (formatInfo.dataInitializerFunction != NULL);
+
+        return true;
+    }
+
+    return false;
+}
+
+DXGI_FORMAT Image11::getDXGIFormat() const
+{
+    // this should only happen if the image hasn't been redefined first
+    // which would be a bug by the caller
+    ASSERT(mDXGIFormat != DXGI_FORMAT_UNKNOWN);
+
+    return mDXGIFormat;
+}
+
+// Store the pixel rectangle designated by xoffset,yoffset,width,height with pixels stored as
+// format/type at input
+// into the target pixel rectangle.
+gl::Error Image11::loadData(const gl::Box &area,
+                            const gl::PixelUnpackState &unpack,
+                            GLenum inputType,
+                            const void *input,
+                            bool applySkipImages)
+{
+    const auto sizedInputFormat = getSizedInputFormat(inputType);
+    const gl::InternalFormat &inputFormat = gl::GetInternalFormatInfo(sizedInputFormat);
+    GLuint inputRowPitch                 = 0;
+    ANGLE_TRY_RESULT(
+        inputFormat.computeRowPitch(area.width, unpack.alignment, unpack.rowLength),
+        inputRowPitch);
+    GLuint inputDepthPitch = 0;
+    ANGLE_TRY_RESULT(gl::InternalFormat::computeDepthPitch(area.height, unpack.imageHeight, inputRowPitch),
+                     inputDepthPitch);
+    GLuint inputSkipBytes = 0;
+    ANGLE_TRY_RESULT(
+        inputFormat.computeSkipBytes(inputRowPitch, inputDepthPitch, unpack, applySkipImages),
+        inputSkipBytes);
+
+    const d3d11::DXGIFormatSize &dxgiFormatInfo = d3d11::GetDXGIFormatSizeInfo(mDXGIFormat);
+    GLuint outputPixelSize                      = dxgiFormatInfo.pixelBytes;
+
+    const d3d11::Format &d3dFormatInfo =
+        d3d11::Format::Get(mInternalFormat, mRenderer->getRenderer11DeviceCaps());
+    LoadImageFunction loadFunction = d3dFormatInfo.getLoadFunctions()(inputType).loadFunction;
+
+    D3D11_MAPPED_SUBRESOURCE mappedImage;
+    ANGLE_TRY(map(D3D11_MAP_WRITE, &mappedImage));
+
+    uint8_t *offsetMappedData = (reinterpret_cast<uint8_t *>(mappedImage.pData) +
+                                 (area.y * mappedImage.RowPitch + area.x * outputPixelSize +
+                                  area.z * mappedImage.DepthPitch));
+    loadFunction(area.width, area.height, area.depth,
+                 reinterpret_cast<const uint8_t *>(input) + inputSkipBytes, inputRowPitch,
+                 inputDepthPitch, offsetMappedData, mappedImage.RowPitch, mappedImage.DepthPitch);
+
+    unmap();
+
+    return gl::NoError();
+}
+
+gl::Error Image11::loadCompressedData(const gl::Box &area, const void *input)
+{
+    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(mInternalFormat);
+    GLsizei inputRowPitch                = 0;
+    ANGLE_TRY_RESULT(formatInfo.computeRowPitch(area.width, 1, 0), inputRowPitch);
+    GLsizei inputDepthPitch = 0;
+    ANGLE_TRY_RESULT(gl::InternalFormat::computeDepthPitch(area.height, 0, inputRowPitch), inputDepthPitch);
+
+    const d3d11::DXGIFormatSize &dxgiFormatInfo = d3d11::GetDXGIFormatSizeInfo(mDXGIFormat);
+    GLuint outputPixelSize                      = dxgiFormatInfo.pixelBytes;
+    GLuint outputBlockWidth                     = dxgiFormatInfo.blockWidth;
+    GLuint outputBlockHeight                    = dxgiFormatInfo.blockHeight;
+
+    ASSERT(area.x % outputBlockWidth == 0);
+    ASSERT(area.y % outputBlockHeight == 0);
+
+    const d3d11::Format &d3dFormatInfo =
+        d3d11::Format::Get(mInternalFormat, mRenderer->getRenderer11DeviceCaps());
+    LoadImageFunction loadFunction =
+        d3dFormatInfo.getLoadFunctions()(GL_UNSIGNED_BYTE).loadFunction;
+
+    D3D11_MAPPED_SUBRESOURCE mappedImage;
+    ANGLE_TRY(map(D3D11_MAP_WRITE, &mappedImage));
+
+    uint8_t *offsetMappedData =
+        reinterpret_cast<uint8_t *>(mappedImage.pData) +
+        ((area.y / outputBlockHeight) * mappedImage.RowPitch +
+         (area.x / outputBlockWidth) * outputPixelSize + area.z * mappedImage.DepthPitch);
+
+    loadFunction(area.width, area.height, area.depth, reinterpret_cast<const uint8_t *>(input),
+                 inputRowPitch, inputDepthPitch, offsetMappedData, mappedImage.RowPitch,
+                 mappedImage.DepthPitch);
+
+    unmap();
+
+    return gl::NoError();
+}
+
+gl::Error Image11::copyFromTexStorage(const gl::ImageIndex &imageIndex, TextureStorage *source)
+{
+    TextureStorage11 *storage11 = GetAs<TextureStorage11>(source);
+
+    ID3D11Resource *resource = nullptr;
+    ANGLE_TRY(storage11->getResource(&resource));
+
+    UINT subresourceIndex = storage11->getSubresourceIndex(imageIndex);
+    TextureHelper11 textureHelper =
+        TextureHelper11::MakeAndReference(resource, storage11->getFormatSet());
+
+    gl::Box sourceBox(0, 0, 0, mWidth, mHeight, mDepth);
+    return copyWithoutConversion(gl::Offset(), sourceBox, textureHelper, subresourceIndex);
+}
+
+gl::Error Image11::copyFromFramebuffer(const gl::Offset &destOffset,
+                                       const gl::Rectangle &sourceArea,
+                                       const gl::Framebuffer *sourceFBO)
+{
+    const gl::FramebufferAttachment *srcAttachment = sourceFBO->getReadColorbuffer();
+    ASSERT(srcAttachment);
+
+    GLenum sourceInternalFormat = srcAttachment->getFormat().asSized();
+    const auto &d3d11Format =
+        d3d11::Format::Get(sourceInternalFormat, mRenderer->getRenderer11DeviceCaps());
+
+    if (d3d11Format.texFormat == mDXGIFormat && sourceInternalFormat == mInternalFormat)
+    {
+        RenderTargetD3D *renderTarget = nullptr;
+        ANGLE_TRY(srcAttachment->getRenderTarget(&renderTarget));
+
+        RenderTarget11 *rt11 = GetAs<RenderTarget11>(renderTarget);
+        ASSERT(rt11->getTexture());
+
+        TextureHelper11 textureHelper =
+            TextureHelper11::MakeAndReference(rt11->getTexture(), rt11->getFormatSet());
+        unsigned int sourceSubResource = rt11->getSubresourceIndex();
+
+        gl::Box sourceBox(sourceArea.x, sourceArea.y, 0, sourceArea.width, sourceArea.height, 1);
+        return copyWithoutConversion(destOffset, sourceBox, textureHelper, sourceSubResource);
+    }
+
+    // This format requires conversion, so we must copy the texture to staging and manually convert
+    // via readPixels
+    D3D11_MAPPED_SUBRESOURCE mappedImage;
+    ANGLE_TRY(map(D3D11_MAP_WRITE, &mappedImage));
+
+    // determine the offset coordinate into the destination buffer
+    const auto &dxgiFormatInfo = d3d11::GetDXGIFormatSizeInfo(mDXGIFormat);
+    GLsizei rowOffset          = dxgiFormatInfo.pixelBytes * destOffset.x;
+
+    uint8_t *dataOffset = static_cast<uint8_t *>(mappedImage.pData) +
+                          mappedImage.RowPitch * destOffset.y + rowOffset +
+                          destOffset.z * mappedImage.DepthPitch;
+
+    const gl::InternalFormat &destFormatInfo = gl::GetInternalFormatInfo(mInternalFormat);
+    const auto &destD3D11Format =
+        d3d11::Format::Get(mInternalFormat, mRenderer->getRenderer11DeviceCaps());
+
+    auto loadFunction = destD3D11Format.getLoadFunctions()(destFormatInfo.type);
+    gl::Error error   = gl::NoError();
+    if (loadFunction.requiresConversion)
+    {
+        size_t bufferSize = destFormatInfo.pixelBytes * sourceArea.width * sourceArea.height;
+        MemoryBuffer *memoryBuffer = nullptr;
+        mRenderer->getScratchMemoryBuffer(bufferSize, &memoryBuffer);
+        GLuint memoryBufferRowPitch = destFormatInfo.pixelBytes * sourceArea.width;
+
+        error = mRenderer->readFromAttachment(*srcAttachment, sourceArea, destFormatInfo.format,
+                                              destFormatInfo.type, memoryBufferRowPitch,
+                                              gl::PixelPackState(), memoryBuffer->data());
+
+        loadFunction.loadFunction(sourceArea.width, sourceArea.height, 1, memoryBuffer->data(),
+                                  memoryBufferRowPitch, 0, dataOffset, mappedImage.RowPitch,
+                                  mappedImage.DepthPitch);
+    }
+    else
+    {
+        error = mRenderer->readFromAttachment(*srcAttachment, sourceArea, destFormatInfo.format,
+                                              destFormatInfo.type, mappedImage.RowPitch,
+                                              gl::PixelPackState(), dataOffset);
+    }
+
+    unmap();
+    mDirty = true;
+
+    return error;
+}
+
+gl::Error Image11::copyWithoutConversion(const gl::Offset &destOffset,
+                                         const gl::Box &sourceArea,
+                                         const TextureHelper11 &textureHelper,
+                                         UINT sourceSubResource)
+{
+    // No conversion needed-- use copyback fastpath
+    ID3D11Resource *stagingTexture       = nullptr;
+    unsigned int stagingSubresourceIndex = 0;
+    ANGLE_TRY(getStagingTexture(&stagingTexture, &stagingSubresourceIndex));
+
+    ID3D11Device *device               = mRenderer->getDevice();
+    ID3D11DeviceContext *deviceContext = mRenderer->getDeviceContext();
+
+    UINT subresourceAfterResolve = sourceSubResource;
+
+    ID3D11Resource *srcTex     = nullptr;
+    const gl::Extents &extents = textureHelper.getExtents();
+
+    bool needResolve =
+        (textureHelper.getTextureType() == GL_TEXTURE_2D && textureHelper.getSampleCount() > 1);
+
+    if (needResolve)
+    {
+        D3D11_TEXTURE2D_DESC resolveDesc;
+        resolveDesc.Width              = extents.width;
+        resolveDesc.Height             = extents.height;
+        resolveDesc.MipLevels          = 1;
+        resolveDesc.ArraySize          = 1;
+        resolveDesc.Format             = textureHelper.getFormat();
+        resolveDesc.SampleDesc.Count   = 1;
+        resolveDesc.SampleDesc.Quality = 0;
+        resolveDesc.Usage              = D3D11_USAGE_DEFAULT;
+        resolveDesc.BindFlags          = 0;
+        resolveDesc.CPUAccessFlags     = 0;
+        resolveDesc.MiscFlags          = 0;
+
+        ID3D11Texture2D *srcTex2D = NULL;
+        HRESULT result            = device->CreateTexture2D(&resolveDesc, NULL, &srcTex2D);
+        if (FAILED(result))
+        {
+            return gl::Error(GL_OUT_OF_MEMORY,
+                             "Failed to create resolve texture for Image11::copy, HRESULT: 0x%X.",
+                             result);
+        }
+        srcTex = srcTex2D;
+
+        deviceContext->ResolveSubresource(srcTex, 0, textureHelper.getTexture2D(),
+                                          sourceSubResource, textureHelper.getFormat());
+        subresourceAfterResolve = 0;
+    }
+    else
+    {
+        srcTex = textureHelper.getResource();
+    }
+
+    D3D11_BOX srcBox;
+    srcBox.left   = sourceArea.x;
+    srcBox.right  = sourceArea.x + sourceArea.width;
+    srcBox.top    = sourceArea.y;
+    srcBox.bottom = sourceArea.y + sourceArea.height;
+    srcBox.front  = sourceArea.z;
+    srcBox.back   = sourceArea.z + sourceArea.depth;
+
+    deviceContext->CopySubresourceRegion(stagingTexture, stagingSubresourceIndex, destOffset.x,
+                                         destOffset.y, destOffset.z, srcTex,
+                                         subresourceAfterResolve, &srcBox);
+
+    if (needResolve)
+    {
+        SafeRelease(srcTex);
+    }
+
+    mDirty = true;
+    return gl::NoError();
+}
+
+gl::Error Image11::getStagingTexture(ID3D11Resource **outStagingTexture,
+                                     unsigned int *outSubresourceIndex)
+{
+    ANGLE_TRY(createStagingTexture());
+
+    *outStagingTexture   = mStagingTexture;
+    *outSubresourceIndex = mStagingSubresource;
+    return gl::NoError();
+}
+
+void Image11::releaseStagingTexture()
+{
+    SafeRelease(mStagingTexture);
+}
+
+gl::Error Image11::createStagingTexture()
+{
+    if (mStagingTexture)
+    {
+        return gl::Error(GL_NO_ERROR);
+    }
+
+    ASSERT(mWidth > 0 && mHeight > 0 && mDepth > 0);
+
+    const DXGI_FORMAT dxgiFormat = getDXGIFormat();
+
+    ID3D11Device *device = mRenderer->getDevice();
+    HRESULT result;
+
+    int lodOffset  = 1;
+    GLsizei width  = mWidth;
+    GLsizei height = mHeight;
+
+    // adjust size if needed for compressed textures
+    d3d11::MakeValidSize(false, dxgiFormat, &width, &height, &lodOffset);
+
+    if (mTarget == GL_TEXTURE_3D)
+    {
+        ID3D11Texture3D *newTexture = NULL;
+
+        D3D11_TEXTURE3D_DESC desc;
+        desc.Width          = width;
+        desc.Height         = height;
+        desc.Depth          = mDepth;
+        desc.MipLevels      = lodOffset + 1;
+        desc.Format         = dxgiFormat;
+        desc.Usage          = D3D11_USAGE_STAGING;
+        desc.BindFlags      = 0;
+        desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ | D3D11_CPU_ACCESS_WRITE;
+        desc.MiscFlags      = 0;
+
+        if (d3d11::Format::Get(mInternalFormat, mRenderer->getRenderer11DeviceCaps())
+                .dataInitializerFunction != NULL)
+        {
+            std::vector<D3D11_SUBRESOURCE_DATA> initialData;
+            std::vector<std::vector<BYTE>> textureData;
+            d3d11::GenerateInitialTextureData(mInternalFormat, mRenderer->getRenderer11DeviceCaps(),
+                                              width, height, mDepth, lodOffset + 1, &initialData,
+                                              &textureData);
+
+            result = device->CreateTexture3D(&desc, initialData.data(), &newTexture);
+        }
+        else
+        {
+            result = device->CreateTexture3D(&desc, NULL, &newTexture);
+        }
+
+        if (FAILED(result))
+        {
+            ASSERT(result == E_OUTOFMEMORY);
+            return gl::Error(GL_OUT_OF_MEMORY, "Failed to create staging texture, result: 0x%X.",
+                             result);
+        }
+
+        mStagingTexture     = newTexture;
+        mStagingSubresource = D3D11CalcSubresource(lodOffset, 0, lodOffset + 1);
+    }
+    else if (mTarget == GL_TEXTURE_2D || mTarget == GL_TEXTURE_2D_ARRAY ||
+             mTarget == GL_TEXTURE_CUBE_MAP)
+    {
+        ID3D11Texture2D *newTexture = NULL;
+
+        D3D11_TEXTURE2D_DESC desc;
+        desc.Width              = width;
+        desc.Height             = height;
+        desc.MipLevels          = lodOffset + 1;
+        desc.ArraySize          = 1;
+        desc.Format             = dxgiFormat;
+        desc.SampleDesc.Count   = 1;
+        desc.SampleDesc.Quality = 0;
+        desc.Usage              = D3D11_USAGE_STAGING;
+        desc.BindFlags          = 0;
+        desc.CPUAccessFlags     = D3D11_CPU_ACCESS_READ | D3D11_CPU_ACCESS_WRITE;
+        desc.MiscFlags          = 0;
+
+        if (d3d11::Format::Get(mInternalFormat, mRenderer->getRenderer11DeviceCaps())
+                .dataInitializerFunction != NULL)
+        {
+            std::vector<D3D11_SUBRESOURCE_DATA> initialData;
+            std::vector<std::vector<BYTE>> textureData;
+            d3d11::GenerateInitialTextureData(mInternalFormat, mRenderer->getRenderer11DeviceCaps(),
+                                              width, height, 1, lodOffset + 1, &initialData,
+                                              &textureData);
+
+            result = device->CreateTexture2D(&desc, initialData.data(), &newTexture);
+        }
+        else
+        {
+            result = device->CreateTexture2D(&desc, NULL, &newTexture);
+        }
+
+        if (FAILED(result))
+        {
+            ASSERT(result == E_OUTOFMEMORY);
+            return gl::Error(GL_OUT_OF_MEMORY, "Failed to create staging texture, result: 0x%X.",
+                             result);
+        }
+
+        mStagingTexture     = newTexture;
+        mStagingSubresource = D3D11CalcSubresource(lodOffset, 0, lodOffset + 1);
+    }
+    else
+    {
+        UNREACHABLE();
+    }
+
+    mDirty = false;
+    return gl::Error(GL_NO_ERROR);
+}
+
+gl::Error Image11::map(D3D11_MAP mapType, D3D11_MAPPED_SUBRESOURCE *map)
+{
+    // We must recover from the TextureStorage if necessary, even for D3D11_MAP_WRITE.
+    ANGLE_TRY(recoverFromAssociatedStorage());
+
+    ID3D11Resource *stagingTexture = NULL;
+    unsigned int subresourceIndex  = 0;
+    ANGLE_TRY(getStagingTexture(&stagingTexture, &subresourceIndex));
+
+    ID3D11DeviceContext *deviceContext = mRenderer->getDeviceContext();
+
+    ASSERT(mStagingTexture);
+    HRESULT result = deviceContext->Map(stagingTexture, subresourceIndex, mapType, 0, map);
+
+    if (FAILED(result))
+    {
+        // this can fail if the device is removed (from TDR)
+        if (d3d11::isDeviceLostError(result))
+        {
+            mRenderer->notifyDeviceLost();
+        }
+        return gl::Error(GL_OUT_OF_MEMORY, "Failed to map staging texture, result: 0x%X.", result);
+    }
+
+    mDirty = true;
+
+    return gl::Error(GL_NO_ERROR);
+}
+
+void Image11::unmap()
+{
+    if (mStagingTexture)
+    {
+        ID3D11DeviceContext *deviceContext = mRenderer->getDeviceContext();
+        deviceContext->Unmap(mStagingTexture, mStagingSubresource);
+    }
+}
+
+}  // namespace rx