src/third_party/angle/src/libANGLE/renderer/d3d/TextureD3D.cpp - cobalt - Git at Google

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

 // TextureD3D.cpp: Implementations of the Texture interfaces shared betweeen the D3D backends.

 #include "libANGLE/renderer/d3d/TextureD3D.h"

 #include "common/mathutil.h"
 #include "common/utilities.h"
 #include "libANGLE/Buffer.h"
 #include "libANGLE/Config.h"
 #include "libANGLE/Framebuffer.h"
 #include "libANGLE/Image.h"
 #include "libANGLE/Surface.h"
 #include "libANGLE/Texture.h"
 #include "libANGLE/formatutils.h"
 #include "libANGLE/renderer/BufferImpl.h"
 #include "libANGLE/renderer/d3d/BufferD3D.h"
 #include "libANGLE/renderer/d3d/EGLImageD3D.h"
 #include "libANGLE/renderer/d3d/ImageD3D.h"
 #include "libANGLE/renderer/d3d/RendererD3D.h"
 #include "libANGLE/renderer/d3d/RenderTargetD3D.h"
 #include "libANGLE/renderer/d3d/SurfaceD3D.h"
 #include "libANGLE/renderer/d3d/TextureStorage.h"

 namespace rx
 {

 namespace
 {

 gl::Error GetUnpackPointer(const gl::PixelUnpackState &unpack, const uint8_t *pixels,
                            ptrdiff_t layerOffset, const uint8_t **pointerOut)
 {
     if (unpack.pixelBuffer.id() != 0)
     {
         // Do a CPU readback here, if we have an unpack buffer bound and the fast GPU path is not supported
         gl::Buffer *pixelBuffer = unpack.pixelBuffer.get();
         ptrdiff_t offset = reinterpret_cast<ptrdiff_t>(pixels);

         // TODO: this is the only place outside of renderer that asks for a buffers raw data.
         // This functionality should be moved into renderer and the getData method of BufferImpl removed.
         BufferD3D *bufferD3D = GetImplAs<BufferD3D>(pixelBuffer);
         ASSERT(bufferD3D);
         const uint8_t *bufferData = nullptr;
         ANGLE_TRY(bufferD3D->getData(&bufferData));
         *pointerOut = bufferData + offset;
     }
     else
     {
         *pointerOut = pixels;
     }

     // Offset the pointer for 2D array layer (if it's valid)
     if (*pointerOut != nullptr)
     {
         *pointerOut += layerOffset;
     }

     return gl::NoError();
 }

 bool IsRenderTargetUsage(GLenum usage)
 {
     return (usage == GL_FRAMEBUFFER_ATTACHMENT_ANGLE);
 }

 }

 TextureD3D::TextureD3D(const gl::TextureState &state, RendererD3D *renderer)
     : TextureImpl(state),
       mRenderer(renderer),
       mDirtyImages(true),
       mImmutable(false),
       mTexStorage(nullptr),
       mBaseLevel(0)
 {
 }

 TextureD3D::~TextureD3D()
 {
 }

 gl::Error TextureD3D::getNativeTexture(TextureStorage **outStorage)
 {
     // ensure the underlying texture is created
     ANGLE_TRY(initializeStorage(false));

     if (mTexStorage)
     {
         ANGLE_TRY(updateStorage());
     }

     ASSERT(outStorage);

     *outStorage = mTexStorage;
     return gl::NoError();
 }

 GLint TextureD3D::getLevelZeroWidth() const
 {
     ASSERT(gl::CountLeadingZeros(static_cast<uint32_t>(getBaseLevelWidth())) > getBaseLevel());
     return getBaseLevelWidth() << mBaseLevel;
 }

 GLint TextureD3D::getLevelZeroHeight() const
 {
     ASSERT(gl::CountLeadingZeros(static_cast<uint32_t>(getBaseLevelHeight())) > getBaseLevel());
     return getBaseLevelHeight() << mBaseLevel;
 }

 GLint TextureD3D::getLevelZeroDepth() const
 {
     return getBaseLevelDepth();
 }

 GLint TextureD3D::getBaseLevelWidth() const
 {
     const ImageD3D *baseImage = getBaseLevelImage();
     return (baseImage ? baseImage->getWidth() : 0);
 }

 GLint TextureD3D::getBaseLevelHeight() const
 {
     const ImageD3D *baseImage = getBaseLevelImage();
     return (baseImage ? baseImage->getHeight() : 0);
 }

 GLint TextureD3D::getBaseLevelDepth() const
 {
     const ImageD3D *baseImage = getBaseLevelImage();
     return (baseImage ? baseImage->getDepth() : 0);
 }

 // Note: "base level image" is loosely defined to be any image from the base level,
 // where in the base of 2D array textures and cube maps there are several. Don't use
 // the base level image for anything except querying texture format and size.
 GLenum TextureD3D::getBaseLevelInternalFormat() const
 {
     const ImageD3D *baseImage = getBaseLevelImage();
     return (baseImage ? baseImage->getInternalFormat() : GL_NONE);
 }

 gl::Error TextureD3D::setStorageMultisample(ContextImpl *contextImpl,
                                             GLenum target,
                                             GLsizei samples,
                                             GLint internalFormat,
                                             const gl::Extents &size,
                                             GLboolean fixedSampleLocations)
 {
     UNIMPLEMENTED();
     return gl::InternalError() << "setStorageMultisample is unimplemented.";
 }

 bool TextureD3D::shouldUseSetData(const ImageD3D *image) const
 {
     if (!mRenderer->getWorkarounds().setDataFasterThanImageUpload)
     {
         return false;
     }

     gl::InternalFormat internalFormat = gl::GetSizedInternalFormatInfo(image->getInternalFormat());

     // We can only handle full updates for depth-stencil textures, so to avoid complications
     // disable them entirely.
     if (internalFormat.depthBits > 0 || internalFormat.stencilBits > 0)
     {
         return false;
     }

     // TODO(jmadill): Handle compressed internal formats
     return (mTexStorage && !internalFormat.compressed);
 }

 gl::Error TextureD3D::setImageImpl(const gl::ImageIndex &index,
                                    GLenum type,
                                    const gl::PixelUnpackState &unpack,
                                    const uint8_t *pixels,
                                    ptrdiff_t layerOffset)
 {
     ImageD3D *image = getImage(index);
     ASSERT(image);

     // No-op
     if (image->getWidth() == 0 || image->getHeight() == 0 || image->getDepth() == 0)
     {
         return gl::NoError();
     }

     // We no longer need the "GLenum format" parameter to TexImage to determine what data format "pixels" contains.
     // From our image internal format we know how many channels to expect, and "type" gives the format of pixel's components.
     const uint8_t *pixelData = nullptr;
     ANGLE_TRY(GetUnpackPointer(unpack, pixels, layerOffset, &pixelData));

     if (pixelData != nullptr)
     {
         if (shouldUseSetData(image))
         {
             ANGLE_TRY(mTexStorage->setData(index, image, nullptr, type, unpack, pixelData));
         }
         else
         {
             gl::Box fullImageArea(0, 0, 0, image->getWidth(), image->getHeight(), image->getDepth());
             ANGLE_TRY(image->loadData(fullImageArea, unpack, type, pixelData, index.is3D()));
         }

         mDirtyImages = true;
     }

     return gl::NoError();
 }

 gl::Error TextureD3D::subImage(const gl::ImageIndex &index, const gl::Box &area, GLenum format, GLenum type,
                                const gl::PixelUnpackState &unpack, const uint8_t *pixels, ptrdiff_t layerOffset)
 {
     // CPU readback & copy where direct GPU copy is not supported
     const uint8_t *pixelData = nullptr;
     ANGLE_TRY(GetUnpackPointer(unpack, pixels, layerOffset, &pixelData));

     if (pixelData != nullptr)
     {
         ImageD3D *image = getImage(index);
         ASSERT(image);

         if (shouldUseSetData(image))
         {
             return mTexStorage->setData(index, image, &area, type, unpack, pixelData);
         }

         ANGLE_TRY(image->loadData(area, unpack, type, pixelData, index.is3D()));
         ANGLE_TRY(commitRegion(index, area));
         mDirtyImages = true;
     }

     return gl::NoError();
 }

 gl::Error TextureD3D::setCompressedImageImpl(const gl::ImageIndex &index,
                                              const gl::PixelUnpackState &unpack,
                                              const uint8_t *pixels,
                                              ptrdiff_t layerOffset)
 {
     ImageD3D *image = getImage(index);
     ASSERT(image);

     if (image->getWidth() == 0 || image->getHeight() == 0 || image->getDepth() == 0)
     {
         return gl::NoError();
     }

     // We no longer need the "GLenum format" parameter to TexImage to determine what data format "pixels" contains.
     // From our image internal format we know how many channels to expect, and "type" gives the format of pixel's components.
     const uint8_t *pixelData = nullptr;
     ANGLE_TRY(GetUnpackPointer(unpack, pixels, layerOffset, &pixelData));

     if (pixelData != nullptr)
     {
         gl::Box fullImageArea(0, 0, 0, image->getWidth(), image->getHeight(), image->getDepth());
         ANGLE_TRY(image->loadCompressedData(fullImageArea, pixelData));

         mDirtyImages = true;
     }

     return gl::NoError();
 }

 gl::Error TextureD3D::subImageCompressed(const gl::ImageIndex &index, const gl::Box &area, GLenum format,
                                          const gl::PixelUnpackState &unpack, const uint8_t *pixels,
                                          ptrdiff_t layerOffset)
 {
     const uint8_t *pixelData = nullptr;
     ANGLE_TRY(GetUnpackPointer(unpack, pixels, layerOffset, &pixelData));

     if (pixelData != nullptr)
     {
         ImageD3D *image = getImage(index);
         ASSERT(image);

         ANGLE_TRY(image->loadCompressedData(area, pixelData));

         mDirtyImages = true;
     }

     return gl::NoError();
 }

 bool TextureD3D::isFastUnpackable(const gl::PixelUnpackState &unpack, GLenum sizedInternalFormat)
 {
     return unpack.pixelBuffer.id() != 0 && mRenderer->supportsFastCopyBufferToTexture(sizedInternalFormat);
 }

 gl::Error TextureD3D::fastUnpackPixels(const gl::PixelUnpackState &unpack, const uint8_t *pixels, const gl::Box &destArea,
                                        GLenum sizedInternalFormat, GLenum type, RenderTargetD3D *destRenderTarget)
 {
     if (unpack.skipRows != 0 || unpack.skipPixels != 0 || unpack.imageHeight != 0 ||
         unpack.skipImages != 0)
     {
         // TODO(jmadill): additional unpack parameters
         UNIMPLEMENTED();
         return gl::Error(GL_INVALID_OPERATION,
                          "Unimplemented pixel store parameters in fastUnpackPixels");
     }

     // No-op
     if (destArea.width <= 0 && destArea.height <= 0 && destArea.depth <= 0)
     {
         return gl::NoError();
     }

     // In order to perform the fast copy through the shader, we must have the right format, and be able
     // to create a render target.
     ASSERT(mRenderer->supportsFastCopyBufferToTexture(sizedInternalFormat));

     uintptr_t offset = reinterpret_cast<uintptr_t>(pixels);

     ANGLE_TRY(mRenderer->fastCopyBufferToTexture(unpack, static_cast<unsigned int>(offset),
                                                  destRenderTarget, sizedInternalFormat, type,
                                                  destArea));

     return gl::NoError();
 }

 GLint TextureD3D::creationLevels(GLsizei width, GLsizei height, GLsizei depth) const
 {
     // To save memory, do not use mipmaps with STARBOARD -- this configuration
     // only uses bilinear filtering at most, so mipmaps aren't needed.
 #if !defined(STARBOARD)
     if ((gl::isPow2(width) && gl::isPow2(height) && gl::isPow2(depth)) ||
         mRenderer->getNativeExtensions().textureNPOT)
     {
         // Maximum number of levels
         return gl::log2(std::max(std::max(width, height), depth)) + 1;
     }
     else
 #endif
     {
         // OpenGL ES 2.0 without GL_OES_texture_npot does not permit NPOT mipmaps.
         return 1;
     }
 }

 TextureStorage *TextureD3D::getStorage()
 {
     ASSERT(mTexStorage);
     return mTexStorage;
 }

 ImageD3D *TextureD3D::getBaseLevelImage() const
 {
     if (mBaseLevel >= gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
     {
         return nullptr;
     }
     return getImage(getImageIndex(mBaseLevel, 0));
 }

 gl::Error TextureD3D::setImageExternal(GLenum target,
                                        egl::Stream *stream,
                                        const egl::Stream::GLTextureDescription &desc)
 {
     // Only external images can accept external textures
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D::generateMipmap(ContextImpl *contextImpl)
 {
     const GLuint baseLevel = mState.getEffectiveBaseLevel();
     const GLuint maxLevel = mState.getMipmapMaxLevel();
     ASSERT(maxLevel > baseLevel);  // Should be checked before calling this.

     if (mTexStorage && mRenderer->getWorkarounds().zeroMaxLodWorkaround)
     {
         // Switch to using the mipmapped texture.
         TextureStorage *textureStorage = nullptr;
         ANGLE_TRY(getNativeTexture(&textureStorage));
         ANGLE_TRY(textureStorage->useLevelZeroWorkaroundTexture(false));
     }

     // Set up proper mipmap chain in our Image array.
     initMipmapImages();

     if (mTexStorage && mTexStorage->supportsNativeMipmapFunction())
     {
         ANGLE_TRY(updateStorage());

         // Generate the mipmap chain using the ad-hoc DirectX function.
         ANGLE_TRY(mRenderer->generateMipmapUsingD3D(mTexStorage, mState));
     }
     else
     {
         // Generate the mipmap chain, one level at a time.
         ANGLE_TRY(generateMipmapUsingImages(maxLevel));
     }

     return gl::NoError();
 }

 gl::Error TextureD3D::generateMipmapUsingImages(const GLuint maxLevel)
 {
     // We know that all layers have the same dimension, for the texture to be complete
     GLint layerCount = static_cast<GLint>(getLayerCount(mBaseLevel));

     // When making mipmaps with the setData workaround enabled, the texture storage has
     // the image data already. For non-render-target storage, we have to pull it out into
     // an image layer.
     if (mRenderer->getWorkarounds().setDataFasterThanImageUpload && mTexStorage)
     {
         if (!mTexStorage->isRenderTarget())
         {
             // Copy from the storage mip 0 to Image mip 0
             for (GLint layer = 0; layer < layerCount; ++layer)
             {
                 gl::ImageIndex srcIndex = getImageIndex(mBaseLevel, layer);

                 ImageD3D *image = getImage(srcIndex);
                 ANGLE_TRY(image->copyFromTexStorage(srcIndex, mTexStorage));
             }
         }
         else
         {
             ANGLE_TRY(updateStorage());
         }
     }

     // TODO: Decouple this from zeroMaxLodWorkaround. This is a 9_3 restriction, unrelated to zeroMaxLodWorkaround.
     // The restriction is because Feature Level 9_3 can't create SRVs on individual levels of the texture.
     // As a result, even if the storage is a rendertarget, we can't use the GPU to generate the mipmaps without further work.
     // The D3D9 renderer works around this by copying each level of the texture into its own single-layer GPU texture (in Blit9::boxFilter).
     // Feature Level 9_3 could do something similar, or it could continue to use CPU-side mipmap generation, or something else.
     bool renderableStorage = (mTexStorage && mTexStorage->isRenderTarget() && !(mRenderer->getWorkarounds().zeroMaxLodWorkaround));

     for (GLint layer = 0; layer < layerCount; ++layer)
     {
         for (GLuint mip = mBaseLevel + 1; mip <= maxLevel; ++mip)
         {
             ASSERT(getLayerCount(mip) == layerCount);

             gl::ImageIndex sourceIndex = getImageIndex(mip - 1, layer);
             gl::ImageIndex destIndex = getImageIndex(mip, layer);

             if (renderableStorage)
             {
                 // GPU-side mipmapping
                 ANGLE_TRY(mTexStorage->generateMipmap(sourceIndex, destIndex));
             }
             else
             {
                 // CPU-side mipmapping
                 ANGLE_TRY(mRenderer->generateMipmap(getImage(destIndex), getImage(sourceIndex)));
             }
         }
     }

     if (mTexStorage)
     {
         updateStorage();
     }

     return gl::NoError();
 }

 bool TextureD3D::isBaseImageZeroSize() const
 {
     ImageD3D *baseImage = getBaseLevelImage();

     if (!baseImage || baseImage->getWidth() <= 0)
     {
         return true;
     }

     if (!gl::IsCubeMapTextureTarget(baseImage->getTarget()) && baseImage->getHeight() <= 0)
     {
         return true;
     }

     if (baseImage->getTarget() == GL_TEXTURE_3D && baseImage->getDepth() <= 0)
     {
         return true;
     }

     if (baseImage->getTarget() == GL_TEXTURE_2D_ARRAY && getLayerCount(getBaseLevel()) <= 0)
     {
         return true;
     }

     return false;
 }

 gl::Error TextureD3D::ensureRenderTarget()
 {
     ANGLE_TRY(initializeStorage(true));

     // initializeStorage can fail with NoError if the texture is not complete. This is not
     // an error for incomplete sampling, but it is a big problem for rendering.
     if (!mTexStorage)
     {
         UNREACHABLE();
         return gl::InternalError() << "Cannot render to incomplete texture.";
     }

     if (!isBaseImageZeroSize())
     {
         ASSERT(mTexStorage);
         if (!mTexStorage->isRenderTarget())
         {
             TextureStorage *newRenderTargetStorage = nullptr;
             ANGLE_TRY(createCompleteStorage(true, &newRenderTargetStorage));

             std::unique_ptr<TextureStorage> newStorageRef(newRenderTargetStorage);
             ANGLE_TRY(mTexStorage->copyToStorage(newRenderTargetStorage));
             ANGLE_TRY(setCompleteTexStorage(newRenderTargetStorage));
             newStorageRef.release();
         }
     }

     return gl::NoError();
 }

 bool TextureD3D::canCreateRenderTargetForImage(const gl::ImageIndex &index) const
 {
     ImageD3D *image = getImage(index);
     bool levelsComplete = (isImageComplete(index) && isImageComplete(getImageIndex(0, 0)));
     return (image->isRenderableFormat() && levelsComplete);
 }

 gl::Error TextureD3D::commitRegion(const gl::ImageIndex &index, const gl::Box &region)
 {
     if (mTexStorage)
     {
         ASSERT(isValidIndex(index));
         ImageD3D *image = getImage(index);
         ANGLE_TRY(image->copyToStorage(mTexStorage, index, region));
         image->markClean();
     }

     return gl::NoError();
 }

 gl::Error TextureD3D::getAttachmentRenderTarget(GLenum /*binding*/,
                                                 const gl::ImageIndex &imageIndex,
                                                 FramebufferAttachmentRenderTarget **rtOut)
 {
     RenderTargetD3D *rtD3D = nullptr;
     gl::Error error        = getRenderTarget(imageIndex, &rtD3D);
     *rtOut = static_cast<FramebufferAttachmentRenderTarget *>(rtD3D);
     return error;
 }

 void TextureD3D::setBaseLevel(GLuint baseLevel)
 {
     const int oldStorageWidth  = std::max(1, getLevelZeroWidth());
     const int oldStorageHeight = std::max(1, getLevelZeroHeight());
     const int oldStorageDepth  = std::max(1, getLevelZeroDepth());
     const int oldStorageFormat = getBaseLevelInternalFormat();
     mBaseLevel                 = baseLevel;

     // When the base level changes, the texture storage might not be valid anymore, since it could
     // have been created based on the dimensions of the previous specified level range.
     const int newStorageWidth  = std::max(1, getLevelZeroWidth());
     const int newStorageHeight = std::max(1, getLevelZeroHeight());
     const int newStorageDepth = std::max(1, getLevelZeroDepth());
     const int newStorageFormat = getBaseLevelInternalFormat();
     if (mTexStorage &&
         (newStorageWidth != oldStorageWidth || newStorageHeight != oldStorageHeight ||
          newStorageDepth != oldStorageDepth || newStorageFormat != oldStorageFormat))
     {
         markAllImagesDirty();
         SafeDelete(mTexStorage);
     }
 }

 void TextureD3D::syncState(const gl::Texture::DirtyBits &dirtyBits)
 {
     // TODO(geofflang): Use dirty bits
 }

 TextureD3D_2D::TextureD3D_2D(const gl::TextureState &state, RendererD3D *renderer)
     : TextureD3D(state, renderer)
 {
     mEGLImageTarget = false;
     for (int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++i)
     {
         mImageArray[i] = renderer->createImage();
     }
 }

 TextureD3D_2DMultisample::TextureD3D_2DMultisample(const gl::TextureState &state,
                                                    RendererD3D *renderer)
     : TextureD3D(state, renderer)
 {
 }

 TextureD3D_2DMultisample::~TextureD3D_2DMultisample()
 {
 }

 ImageD3D *TextureD3D_2DMultisample::getImage(const gl::ImageIndex &index) const
 {
     UNIMPLEMENTED();
     return nullptr;
 }

 gl::Error TextureD3D_2DMultisample::setImage(ContextImpl *contextImpl,
                                              GLenum target,
                                              size_t level,
                                              GLenum internalFormat,
                                              const gl::Extents &size,
                                              GLenum format,
                                              GLenum type,
                                              const gl::PixelUnpackState &unpack,
                                              const uint8_t *pixels)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::setSubImage(ContextImpl *contextImpl,
                                                 GLenum target,
                                                 size_t level,
                                                 const gl::Box &area,
                                                 GLenum format,
                                                 GLenum type,
                                                 const gl::PixelUnpackState &unpack,
                                                 const uint8_t *pixels)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::setCompressedImage(ContextImpl *contextImpl,
                                                        GLenum target,
                                                        size_t level,
                                                        GLenum internalFormat,
                                                        const gl::Extents &size,
                                                        const gl::PixelUnpackState &unpack,
                                                        size_t imageSize,
                                                        const uint8_t *pixels)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::setCompressedSubImage(ContextImpl *contextImpl,
                                                           GLenum target,
                                                           size_t level,
                                                           const gl::Box &area,
                                                           GLenum format,
                                                           const gl::PixelUnpackState &unpack,
                                                           size_t imageSize,
                                                           const uint8_t *pixels)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::copyImage(ContextImpl *contextImpl,
                                               GLenum target,
                                               size_t level,
                                               const gl::Rectangle &sourceArea,
                                               GLenum internalFormat,
                                               const gl::Framebuffer *source)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::copySubImage(ContextImpl *contextImpl,
                                                  GLenum target,
                                                  size_t level,
                                                  const gl::Offset &destOffset,
                                                  const gl::Rectangle &sourceArea,
                                                  const gl::Framebuffer *source)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::setStorage(ContextImpl *contextImpl,
                                                GLenum target,
                                                size_t levels,
                                                GLenum internalFormat,
                                                const gl::Extents &size)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::setImageExternal(GLenum target,
                                                      egl::Stream *stream,
                                                      const egl::Stream::GLTextureDescription &desc)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 void TextureD3D_2DMultisample::bindTexImage(egl::Surface *surface)
 {
     UNIMPLEMENTED();
 }

 void TextureD3D_2DMultisample::releaseTexImage()
 {
     UNIMPLEMENTED();
 }

 gl::Error TextureD3D_2DMultisample::setEGLImageTarget(GLenum target, egl::Image *image)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::getRenderTarget(const gl::ImageIndex &index,
                                                     RenderTargetD3D **outRT)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::ImageIndexIterator TextureD3D_2DMultisample::imageIterator() const
 {
     UNIMPLEMENTED();
     return gl::ImageIndexIterator::Make2DMultisample();
 }

 gl::ImageIndex TextureD3D_2DMultisample::getImageIndex(GLint mip, GLint layer) const
 {
     UNIMPLEMENTED();
     return gl::ImageIndex::Make2DMultisample();
 }

 bool TextureD3D_2DMultisample::isValidIndex(const gl::ImageIndex &index) const
 {
     UNIMPLEMENTED();
     return false;
 }

 GLsizei TextureD3D_2DMultisample::getLayerCount(int level) const
 {
     UNIMPLEMENTED();
     return GLsizei();
 }

 void TextureD3D_2DMultisample::markAllImagesDirty()
 {
     UNIMPLEMENTED();
 }

 gl::Error TextureD3D_2DMultisample::initializeStorage(bool renderTarget)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::createCompleteStorage(bool renderTarget,
                                                           TextureStorage **outTexStorage) const
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::setCompleteTexStorage(TextureStorage *newCompleteTexStorage)
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 gl::Error TextureD3D_2DMultisample::updateStorage()
 {
     UNIMPLEMENTED();
     return gl::InternalError();
 }

 void TextureD3D_2DMultisample::initMipmapImages()
 {
     UNIMPLEMENTED();
 }

 bool TextureD3D_2DMultisample::isImageComplete(const gl::ImageIndex &index) const
 {
     UNIMPLEMENTED();
     return false;
 }

 TextureD3D_2D::~TextureD3D_2D()
 {
     // Delete the Images before the TextureStorage.
     // Images might be relying on the TextureStorage for some of their data.
     // If TextureStorage is deleted before the Images, then their data will be wastefully copied back from the GPU before we delete the Images.
     for (int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++i)
     {
         SafeDelete(mImageArray[i]);
     }

     SafeDelete(mTexStorage);
 }

 ImageD3D *TextureD3D_2D::getImage(int level, int layer) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT(layer == 0);
     return mImageArray[level];
 }

 ImageD3D *TextureD3D_2D::getImage(const gl::ImageIndex &index) const
 {
     ASSERT(index.mipIndex < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT(!index.hasLayer());
     ASSERT(index.type == GL_TEXTURE_2D);
     return mImageArray[index.mipIndex];
 }

 GLsizei TextureD3D_2D::getLayerCount(int level) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     return 1;
 }

 GLsizei TextureD3D_2D::getWidth(GLint level) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[level]->getWidth();
     else
         return 0;
 }

 GLsizei TextureD3D_2D::getHeight(GLint level) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[level]->getHeight();
     else
         return 0;
 }

 GLenum TextureD3D_2D::getInternalFormat(GLint level) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[level]->getInternalFormat();
     else
         return GL_NONE;
 }

 bool TextureD3D_2D::isDepth(GLint level) const
 {
     return gl::GetSizedInternalFormatInfo(getInternalFormat(level)).depthBits > 0;
 }

 gl::Error TextureD3D_2D::setImage(ContextImpl *contextImpl,
                                   GLenum target,
                                   size_t imageLevel,
                                   GLenum internalFormat,
                                   const gl::Extents &size,
                                   GLenum format,
                                   GLenum type,
                                   const gl::PixelUnpackState &unpack,
                                   const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D && size.depth == 1);

     const gl::InternalFormat &internalFormatInfo = gl::GetInternalFormatInfo(internalFormat, type);

     bool fastUnpacked = false;
     GLint level       = static_cast<GLint>(imageLevel);

     redefineImage(level, internalFormatInfo.sizedInternalFormat, size, false);

     gl::ImageIndex index = gl::ImageIndex::Make2D(level);

     // Attempt a fast gpu copy of the pixel data to the surface
     if (isFastUnpackable(unpack, internalFormatInfo.sizedInternalFormat) && isLevelComplete(level))
     {
         // Will try to create RT storage if it does not exist
         RenderTargetD3D *destRenderTarget = nullptr;
         ANGLE_TRY(getRenderTarget(index, &destRenderTarget));

         gl::Box destArea(0, 0, 0, getWidth(level), getHeight(level), 1);

         ANGLE_TRY(fastUnpackPixels(unpack, pixels, destArea, internalFormatInfo.sizedInternalFormat,
                                    type, destRenderTarget));

         // Ensure we don't overwrite our newly initialized data
         mImageArray[level]->markClean();

         fastUnpacked = true;
     }

     if (!fastUnpacked)
     {
         ANGLE_TRY(setImageImpl(index, type, unpack, pixels, 0));
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::setSubImage(ContextImpl *contextImpl,
                                      GLenum target,
                                      size_t imageLevel,
                                      const gl::Box &area,
                                      GLenum format,
                                      GLenum type,
                                      const gl::PixelUnpackState &unpack,
                                      const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D && area.depth == 1 && area.z == 0);

     GLint level          = static_cast<GLint>(imageLevel);
     gl::ImageIndex index = gl::ImageIndex::Make2D(level);
     if (isFastUnpackable(unpack, getInternalFormat(level)) && isLevelComplete(level))
     {
         RenderTargetD3D *renderTarget = nullptr;
         ANGLE_TRY(getRenderTarget(index, &renderTarget));
         ASSERT(!mImageArray[level]->isDirty());

         return fastUnpackPixels(unpack, pixels, area, getInternalFormat(level), type, renderTarget);
     }
     else
     {
         return TextureD3D::subImage(index, area, format, type, unpack, pixels, 0);
     }
 }

 gl::Error TextureD3D_2D::setCompressedImage(ContextImpl *contextImpl,
                                             GLenum target,
                                             size_t imageLevel,
                                             GLenum internalFormat,
                                             const gl::Extents &size,
                                             const gl::PixelUnpackState &unpack,
                                             size_t imageSize,
                                             const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D && size.depth == 1);
     GLint level = static_cast<GLint>(imageLevel);

     // compressed formats don't have separate sized internal formats-- we can just use the compressed format directly
     redefineImage(level, internalFormat, size, false);

     return setCompressedImageImpl(gl::ImageIndex::Make2D(level), unpack, pixels, 0);
 }

 gl::Error TextureD3D_2D::setCompressedSubImage(ContextImpl *contextImpl,
                                                GLenum target,
                                                size_t level,
                                                const gl::Box &area,
                                                GLenum format,
                                                const gl::PixelUnpackState &unpack,
                                                size_t imageSize,
                                                const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D && area.depth == 1 && area.z == 0);

     gl::ImageIndex index = gl::ImageIndex::Make2D(static_cast<GLint>(level));
     ANGLE_TRY(TextureD3D::subImageCompressed(index, area, format, unpack, pixels, 0));

     return commitRegion(index, area);
 }

 gl::Error TextureD3D_2D::copyImage(ContextImpl *contextImpl,
                                    GLenum target,
                                    size_t imageLevel,
                                    const gl::Rectangle &sourceArea,
                                    GLenum internalFormat,
                                    const gl::Framebuffer *source)
 {
     ASSERT(target == GL_TEXTURE_2D);

     GLint level                = static_cast<GLint>(imageLevel);
     const gl::InternalFormat &internalFormatInfo =
         gl::GetInternalFormatInfo(internalFormat, GL_UNSIGNED_BYTE);
     redefineImage(level, internalFormatInfo.sizedInternalFormat,
                   gl::Extents(sourceArea.width, sourceArea.height, 1), false);

     gl::ImageIndex index = gl::ImageIndex::Make2D(level);
     gl::Offset destOffset(0, 0, 0);

     // If the zero max LOD workaround is active, then we can't sample from individual layers of the framebuffer in shaders,
     // so we should use the non-rendering copy path.
     if (!canCreateRenderTargetForImage(index) || mRenderer->getWorkarounds().zeroMaxLodWorkaround)
     {
         ANGLE_TRY(mImageArray[level]->copyFromFramebuffer(destOffset, sourceArea, source));
         mDirtyImages = true;
     }
     else
     {
         ANGLE_TRY(ensureRenderTarget());
         mImageArray[level]->markClean();

         if (sourceArea.width != 0 && sourceArea.height != 0 && isValidLevel(level))
         {
             ANGLE_TRY(mRenderer->copyImage2D(source, sourceArea, internalFormat, destOffset,
                                              mTexStorage, level));
         }
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::copySubImage(ContextImpl *contextImpl,
                                       GLenum target,
                                       size_t imageLevel,
                                       const gl::Offset &destOffset,
                                       const gl::Rectangle &sourceArea,
                                       const gl::Framebuffer *source)
 {
     ASSERT(target == GL_TEXTURE_2D && destOffset.z == 0);

     // can only make our texture storage to a render target if level 0 is defined (with a width & height) and
     // the current level we're copying to is defined (with appropriate format, width & height)

     GLint level          = static_cast<GLint>(imageLevel);
     gl::ImageIndex index = gl::ImageIndex::Make2D(level);

     // If the zero max LOD workaround is active, then we can't sample from individual layers of the framebuffer in shaders,
     // so we should use the non-rendering copy path.
     if (!canCreateRenderTargetForImage(index) || mRenderer->getWorkarounds().zeroMaxLodWorkaround)
     {
         ANGLE_TRY(mImageArray[level]->copyFromFramebuffer(destOffset, sourceArea, source));
         mDirtyImages = true;
     }
     else
     {
         ANGLE_TRY(ensureRenderTarget());

         if (isValidLevel(level))
         {
             ANGLE_TRY(updateStorageLevel(level));
             ANGLE_TRY(mRenderer->copyImage2D(source, sourceArea,
                                              gl::GetUnsizedFormat(getBaseLevelInternalFormat()),
                                              destOffset, mTexStorage, level));
         }
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::copyTexture(ContextImpl *contextImpl,
                                      GLenum target,
                                      size_t level,
                                      GLenum internalFormat,
                                      GLenum type,
                                      size_t sourceLevel,
                                      bool unpackFlipY,
                                      bool unpackPremultiplyAlpha,
                                      bool unpackUnmultiplyAlpha,
                                      const gl::Texture *source)
 {
     ASSERT(target == GL_TEXTURE_2D);

     GLenum sourceTarget = source->getTarget();

     GLint destLevel = static_cast<GLint>(level);

     const gl::InternalFormat &internalFormatInfo = gl::GetInternalFormatInfo(internalFormat, type);
     gl::Extents size(static_cast<int>(source->getWidth(sourceTarget, sourceLevel)),
                      static_cast<int>(source->getHeight(sourceTarget, sourceLevel)), 1);
     redefineImage(destLevel, internalFormatInfo.sizedInternalFormat, size, false);

     ASSERT(canCreateRenderTargetForImage(gl::ImageIndex::Make2D(destLevel)));

     ANGLE_TRY(ensureRenderTarget());
     ASSERT(isValidLevel(destLevel));
     ANGLE_TRY(updateStorageLevel(destLevel));

     gl::Rectangle sourceRect(0, 0, size.width, size.height);
     gl::Offset destOffset(0, 0, 0);
     ANGLE_TRY(mRenderer->copyTexture(source, static_cast<GLint>(sourceLevel), sourceRect,
                                      internalFormatInfo.format, destOffset, mTexStorage, target,
                                      destLevel, unpackFlipY, unpackPremultiplyAlpha,
                                      unpackUnmultiplyAlpha));

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::copySubTexture(ContextImpl *contextImpl,
                                         GLenum target,
                                         size_t level,
                                         const gl::Offset &destOffset,
                                         size_t sourceLevel,
                                         const gl::Rectangle &sourceArea,
                                         bool unpackFlipY,
                                         bool unpackPremultiplyAlpha,
                                         bool unpackUnmultiplyAlpha,
                                         const gl::Texture *source)
 {
     ASSERT(target == GL_TEXTURE_2D);

     GLint destLevel = static_cast<GLint>(level);

     ASSERT(canCreateRenderTargetForImage(gl::ImageIndex::Make2D(destLevel)));

     ANGLE_TRY(ensureRenderTarget());
     ASSERT(isValidLevel(destLevel));
     ANGLE_TRY(updateStorageLevel(destLevel));

     ANGLE_TRY(mRenderer->copyTexture(source, static_cast<GLint>(sourceLevel), sourceArea,
                                      gl::GetUnsizedFormat(getBaseLevelInternalFormat()), destOffset,
                                      mTexStorage, target, destLevel, unpackFlipY,
                                      unpackPremultiplyAlpha, unpackUnmultiplyAlpha));

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::copyCompressedTexture(ContextImpl *contextImpl, const gl::Texture *source)
 {
     GLenum sourceTarget = source->getTarget();
     GLint sourceLevel   = 0;

     GLint destLevel = 0;

     GLenum sizedInternalFormat =
         source->getFormat(sourceTarget, sourceLevel).info->sizedInternalFormat;
     gl::Extents size(static_cast<int>(source->getWidth(sourceTarget, sourceLevel)),
                      static_cast<int>(source->getHeight(sourceTarget, sourceLevel)), 1);
     redefineImage(destLevel, sizedInternalFormat, size, false);

     ANGLE_TRY(initializeStorage(false));
     ASSERT(mTexStorage);

     ANGLE_TRY(mRenderer->copyCompressedTexture(source, sourceLevel, mTexStorage, destLevel));

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::setStorage(ContextImpl *contextImpl,
                                     GLenum target,
                                     size_t levels,
                                     GLenum internalFormat,
                                     const gl::Extents &size)
 {
     ASSERT(GL_TEXTURE_2D && size.depth == 1);

     for (size_t level = 0; level < levels; level++)
     {
         gl::Extents levelSize(std::max(1, size.width >> level),
                               std::max(1, size.height >> level),
                               1);
         redefineImage(level, internalFormat, levelSize, true);
     }

     for (size_t level = levels; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
     {
         redefineImage(level, GL_NONE, gl::Extents(0, 0, 1), true);
     }

     // TODO(geofflang): Verify storage creation had no errors
     bool renderTarget       = IsRenderTargetUsage(mState.getUsage());
     TextureStorage *storage = mRenderer->createTextureStorage2D(
         internalFormat, renderTarget, size.width, size.height, static_cast<int>(levels), false);

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ANGLE_TRY(updateStorage());

     mImmutable = true;

     return gl::NoError();
 }

 void TextureD3D_2D::bindTexImage(egl::Surface *surface)
 {
     GLenum internalformat = surface->getConfig()->renderTargetFormat;

     gl::Extents size(surface->getWidth(), surface->getHeight(), 1);
     redefineImage(0, internalformat, size, true);

     if (mTexStorage)
     {
         SafeDelete(mTexStorage);
     }

     SurfaceD3D *surfaceD3D = GetImplAs<SurfaceD3D>(surface);
     ASSERT(surfaceD3D);

     if (surfaceD3D->getSwapChain() == nullptr)
         mTexStorage = mRenderer->createTextureStorage2D(
             surfaceD3D->getD3DTexture(), surfaceD3D->getBindChroma(),
             surfaceD3D->getDxgiBuffer());
     else
         mTexStorage = mRenderer->createTextureStorage2D(surfaceD3D->getSwapChain());
     mEGLImageTarget = false;

     mDirtyImages = true;
 }

 void TextureD3D_2D::releaseTexImage()
 {
     if (mTexStorage)
     {
         SafeDelete(mTexStorage);
     }

     for (int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
     {
         redefineImage(i, GL_NONE, gl::Extents(0, 0, 1), true);
     }
 }

 gl::Error TextureD3D_2D::setEGLImageTarget(GLenum target, egl::Image *image)
 {
     EGLImageD3D *eglImaged3d = GetImplAs<EGLImageD3D>(image);

     // Set the properties of the base mip level from the EGL image
     const auto &format = image->getFormat();
     gl::Extents size(static_cast<int>(image->getWidth()), static_cast<int>(image->getHeight()), 1);
     redefineImage(0, format.info->sizedInternalFormat, size, true);

     // Clear all other images.
     for (size_t level = 1; level < ArraySize(mImageArray); level++)
     {
         redefineImage(level, GL_NONE, gl::Extents(0, 0, 1), true);
     }

     SafeDelete(mTexStorage);
     mImageArray[0]->markClean();

     // Pass in the RenderTargetD3D here: createTextureStorage can't generate an error.
     RenderTargetD3D *renderTargetD3D = nullptr;
     ANGLE_TRY(eglImaged3d->getRenderTarget(&renderTargetD3D));

     mTexStorage     = mRenderer->createTextureStorageEGLImage(eglImaged3d, renderTargetD3D);
     mEGLImageTarget = true;

     return gl::NoError();
 }

 void TextureD3D_2D::initMipmapImages()
 {
     const GLuint baseLevel = mState.getEffectiveBaseLevel();
     const GLuint maxLevel  = mState.getMipmapMaxLevel();
     // Purge array levels baseLevel + 1 through q and reset them to represent the generated mipmap
     // levels.
     for (GLuint level = baseLevel + 1; level <= maxLevel; level++)
     {
         gl::Extents levelSize(std::max(getLevelZeroWidth() >> level, 1),
                               std::max(getLevelZeroHeight() >> level, 1), 1);

         redefineImage(level, getBaseLevelInternalFormat(), levelSize, false);
     }
 }

 gl::Error TextureD3D_2D::getRenderTarget(const gl::ImageIndex &index, RenderTargetD3D **outRT)
 {
     ASSERT(!index.hasLayer());

     // ensure the underlying texture is created
     ANGLE_TRY(ensureRenderTarget());
     ANGLE_TRY(updateStorageLevel(index.mipIndex));

     return mTexStorage->getRenderTarget(index, outRT);
 }

 bool TextureD3D_2D::isValidLevel(int level) const
 {
     return (mTexStorage ? (level >= 0 && level < mTexStorage->getLevelCount()) : false);
 }

 bool TextureD3D_2D::isLevelComplete(int level) const
 {
     if (isImmutable())
     {
         return true;
     }

     GLsizei width  = getLevelZeroWidth();
     GLsizei height = getLevelZeroHeight();

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

     // The base image level is complete if the width and height are positive
     if (level == static_cast<int>(getBaseLevel()))
     {
         return true;
     }

     ASSERT(level >= 0 && level <= (int)ArraySize(mImageArray) && mImageArray[level] != nullptr);
     ImageD3D *image = mImageArray[level];

     if (image->getInternalFormat() != getBaseLevelInternalFormat())
     {
         return false;
     }

     if (image->getWidth() != std::max(1, width >> level))
     {
         return false;
     }

     if (image->getHeight() != std::max(1, height >> level))
     {
         return false;
     }

     return true;
 }

 bool TextureD3D_2D::isImageComplete(const gl::ImageIndex &index) const
 {
     return isLevelComplete(index.mipIndex);
 }

 // Constructs a native texture resource from the texture images
 gl::Error TextureD3D_2D::initializeStorage(bool renderTarget)
 {
     // Only initialize the first time this texture is used as a render target or shader resource
     if (mTexStorage)
     {
         return gl::NoError();
     }

     // do not attempt to create storage for nonexistant data
     if (!isLevelComplete(getBaseLevel()))
     {
         return gl::NoError();
     }

     bool createRenderTarget = (renderTarget || IsRenderTargetUsage(mState.getUsage()));

     TextureStorage *storage = nullptr;
     ANGLE_TRY(createCompleteStorage(createRenderTarget, &storage));

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ASSERT(mTexStorage);

     // flush image data to the storage
     ANGLE_TRY(updateStorage());

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::createCompleteStorage(bool renderTarget, TextureStorage **outTexStorage) const
 {
     GLsizei width         = getLevelZeroWidth();
     GLsizei height        = getLevelZeroHeight();
     GLenum internalFormat = getBaseLevelInternalFormat();

     ASSERT(width > 0 && height > 0);

     // use existing storage level count, when previously specified by TexStorage*D
     GLint levels = (mTexStorage ? mTexStorage->getLevelCount() : creationLevels(width, height, 1));

     bool hintLevelZeroOnly = false;
     if (mRenderer->getWorkarounds().zeroMaxLodWorkaround)
     {
         // If any of the CPU images (levels >= 1) are dirty, then the textureStorage2D should use the mipped texture to begin with.
         // Otherwise, it should use the level-zero-only texture.
         hintLevelZeroOnly = true;
         for (int level = 1; level < levels && hintLevelZeroOnly; level++)
         {
             hintLevelZeroOnly = !(mImageArray[level]->isDirty() && isLevelComplete(level));
         }
     }

     // TODO(geofflang): Determine if the texture creation succeeded
     *outTexStorage = mRenderer->createTextureStorage2D(internalFormat, renderTarget, width, height, levels, hintLevelZeroOnly);

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::setCompleteTexStorage(TextureStorage *newCompleteTexStorage)
 {
     if (newCompleteTexStorage && newCompleteTexStorage->isManaged())
     {
         for (int level = 0; level < newCompleteTexStorage->getLevelCount(); level++)
         {
             ANGLE_TRY(mImageArray[level]->setManagedSurface2D(newCompleteTexStorage, level));
         }
     }

     SafeDelete(mTexStorage);
     mTexStorage = newCompleteTexStorage;

     mDirtyImages = true;

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::updateStorage()
 {
     ASSERT(mTexStorage != nullptr);
     GLint storageLevels = mTexStorage->getLevelCount();
     for (int level = 0; level < storageLevels; level++)
     {
         if (mImageArray[level]->isDirty() && isLevelComplete(level))
         {
             ANGLE_TRY(updateStorageLevel(level));
         }
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2D::updateStorageLevel(int level)
 {
     ASSERT(level <= (int)ArraySize(mImageArray) && mImageArray[level] != nullptr);
     ASSERT(isLevelComplete(level));

     if (mImageArray[level]->isDirty())
     {
         gl::ImageIndex index = gl::ImageIndex::Make2D(level);
         gl::Box region(0, 0, 0, getWidth(level), getHeight(level), 1);
         ANGLE_TRY(commitRegion(index, region));
     }

     return gl::NoError();
 }

 void TextureD3D_2D::redefineImage(size_t level,
                                   GLenum internalformat,
                                   const gl::Extents &size,
                                   bool forceRelease)
 {
     ASSERT(size.depth == 1);

     // If there currently is a corresponding storage texture image, it has these parameters
     const int storageWidth     = std::max(1, getLevelZeroWidth() >> level);
     const int storageHeight    = std::max(1, getLevelZeroHeight() >> level);
     const GLenum storageFormat = getBaseLevelInternalFormat();

     mImageArray[level]->redefine(GL_TEXTURE_2D, internalformat, size, forceRelease);

     if (mTexStorage)
     {
         const size_t storageLevels = mTexStorage->getLevelCount();

         // If the storage was from an EGL image, copy it back into local images to preserve it
         // while orphaning
         if (level != 0 && mEGLImageTarget)
         {
             // TODO(jmadill): Don't discard error.
             mImageArray[0]->copyFromTexStorage(gl::ImageIndex::Make2D(0), mTexStorage);
         }

         if ((level >= storageLevels && storageLevels != 0) ||
             size.width != storageWidth ||
             size.height != storageHeight ||
             internalformat != storageFormat)   // Discard mismatched storage
         {
             SafeDelete(mTexStorage);
             markAllImagesDirty();
         }
     }

     // Can't be an EGL image target after being redefined
     mEGLImageTarget = false;
 }

 gl::ImageIndexIterator TextureD3D_2D::imageIterator() const
 {
     return gl::ImageIndexIterator::Make2D(0, mTexStorage->getLevelCount());
 }

 gl::ImageIndex TextureD3D_2D::getImageIndex(GLint mip, GLint /*layer*/) const
 {
     // "layer" does not apply to 2D Textures.
     return gl::ImageIndex::Make2D(mip);
 }

 bool TextureD3D_2D::isValidIndex(const gl::ImageIndex &index) const
 {
     return (mTexStorage && index.type == GL_TEXTURE_2D &&
             index.mipIndex >= 0 && index.mipIndex < mTexStorage->getLevelCount());
 }

 void TextureD3D_2D::markAllImagesDirty()
 {
     for (size_t i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
     {
         mImageArray[i]->markDirty();
     }
     mDirtyImages = true;
 }

 gl::Error TextureD3D_2D::setStorageMultisample(ContextImpl *contextImpl,
                                                GLenum target,
                                                GLsizei samples,
                                                GLint internalFormat,
                                                const gl::Extents &size,
                                                GLboolean fixedSampleLocations)
 {
     UNIMPLEMENTED();
     return gl::InternalError() << "setStorageMultisample is unimplemented.";
 }

 TextureD3D_Cube::TextureD3D_Cube(const gl::TextureState &state, RendererD3D *renderer)
     : TextureD3D(state, renderer)
 {
     for (int i = 0; i < 6; i++)
     {
         for (int j = 0; j < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++j)
         {
             mImageArray[i][j] = renderer->createImage();
         }
     }
 }

 TextureD3D_Cube::~TextureD3D_Cube()
 {
     // Delete the Images before the TextureStorage.
     // Images might be relying on the TextureStorage for some of their data.
     // If TextureStorage is deleted before the Images, then their data will be wastefully copied back from the GPU before we delete the Images.
     for (int i = 0; i < 6; i++)
     {
         for (int j = 0; j < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++j)
         {
             SafeDelete(mImageArray[i][j]);
         }
     }

     SafeDelete(mTexStorage);
 }

 ImageD3D *TextureD3D_Cube::getImage(int level, int layer) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT(layer >= 0 && layer < 6);
     return mImageArray[layer][level];
 }

 ImageD3D *TextureD3D_Cube::getImage(const gl::ImageIndex &index) const
 {
     ASSERT(index.mipIndex < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT(index.layerIndex >= 0 && index.layerIndex < 6);
     return mImageArray[index.layerIndex][index.mipIndex];
 }

 GLsizei TextureD3D_Cube::getLayerCount(int level) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     return 6;
 }

 GLenum TextureD3D_Cube::getInternalFormat(GLint level, GLint layer) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[layer][level]->getInternalFormat();
     else
         return GL_NONE;
 }

 bool TextureD3D_Cube::isDepth(GLint level, GLint layer) const
 {
     return gl::GetSizedInternalFormatInfo(getInternalFormat(level, layer)).depthBits > 0;
 }

 gl::Error TextureD3D_Cube::setEGLImageTarget(GLenum target, egl::Image *image)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_Cube::setImage(ContextImpl *contextImpl,
                                     GLenum target,
                                     size_t level,
                                     GLenum internalFormat,
                                     const gl::Extents &size,
                                     GLenum format,
                                     GLenum type,
                                     const gl::PixelUnpackState &unpack,
                                     const uint8_t *pixels)
 {
     ASSERT(size.depth == 1);

     const gl::InternalFormat &internalFormatInfo = gl::GetInternalFormatInfo(internalFormat, type);
     gl::ImageIndex index       = gl::ImageIndex::MakeCube(target, static_cast<GLint>(level));

     redefineImage(index.layerIndex, static_cast<GLint>(level),
                   internalFormatInfo.sizedInternalFormat, size);

     return setImageImpl(index, type, unpack, pixels, 0);
 }

 gl::Error TextureD3D_Cube::setSubImage(ContextImpl *contextImpl,
                                        GLenum target,
                                        size_t level,
                                        const gl::Box &area,
                                        GLenum format,
                                        GLenum type,
                                        const gl::PixelUnpackState &unpack,
                                        const uint8_t *pixels)
 {
     ASSERT(area.depth == 1 && area.z == 0);

     gl::ImageIndex index = gl::ImageIndex::MakeCube(target, static_cast<GLint>(level));
     return TextureD3D::subImage(index, area, format, type, unpack, pixels, 0);
 }

 gl::Error TextureD3D_Cube::setCompressedImage(ContextImpl *contextImpl,
                                               GLenum target,
                                               size_t level,
                                               GLenum internalFormat,
                                               const gl::Extents &size,
                                               const gl::PixelUnpackState &unpack,
                                               size_t imageSize,
                                               const uint8_t *pixels)
 {
     ASSERT(size.depth == 1);

     // compressed formats don't have separate sized internal formats-- we can just use the compressed format directly
     size_t faceIndex = gl::CubeMapTextureTargetToLayerIndex(target);

     redefineImage(static_cast<int>(faceIndex), static_cast<GLint>(level), internalFormat, size);

     gl::ImageIndex index = gl::ImageIndex::MakeCube(target, static_cast<GLint>(level));
     return setCompressedImageImpl(index, unpack, pixels, 0);
 }

 gl::Error TextureD3D_Cube::setCompressedSubImage(ContextImpl *contextImpl,
                                                  GLenum target,
                                                  size_t level,
                                                  const gl::Box &area,
                                                  GLenum format,
                                                  const gl::PixelUnpackState &unpack,
                                                  size_t imageSize,
                                                  const uint8_t *pixels)
 {
     ASSERT(area.depth == 1 && area.z == 0);

     gl::ImageIndex index = gl::ImageIndex::MakeCube(target, static_cast<GLint>(level));

     ANGLE_TRY(TextureD3D::subImageCompressed(index, area, format, unpack, pixels, 0));
     return commitRegion(index, area);
 }

 gl::Error TextureD3D_Cube::copyImage(ContextImpl *contextImpl,
                                      GLenum target,
                                      size_t imageLevel,
                                      const gl::Rectangle &sourceArea,
                                      GLenum internalFormat,
                                      const gl::Framebuffer *source)
 {
     int faceIndex              = static_cast<int>(gl::CubeMapTextureTargetToLayerIndex(target));
     const gl::InternalFormat &internalFormatInfo =
         gl::GetInternalFormatInfo(internalFormat, GL_UNSIGNED_BYTE);

     GLint level = static_cast<GLint>(imageLevel);

     gl::Extents size(sourceArea.width, sourceArea.height, 1);
     redefineImage(static_cast<int>(faceIndex), level, internalFormatInfo.sizedInternalFormat, size);

     gl::ImageIndex index = gl::ImageIndex::MakeCube(target, level);
     gl::Offset destOffset(0, 0, 0);

     // If the zero max LOD workaround is active, then we can't sample from individual layers of the framebuffer in shaders,
     // so we should use the non-rendering copy path.
     if (!canCreateRenderTargetForImage(index) || mRenderer->getWorkarounds().zeroMaxLodWorkaround)
     {
         ANGLE_TRY(
             mImageArray[faceIndex][level]->copyFromFramebuffer(destOffset, sourceArea, source));
         mDirtyImages = true;
     }
     else
     {
         ANGLE_TRY(ensureRenderTarget());
         mImageArray[faceIndex][level]->markClean();

         ASSERT(size.width == size.height);

         if (size.width > 0 && isValidFaceLevel(faceIndex, level))
         {
             ANGLE_TRY(mRenderer->copyImageCube(source, sourceArea, internalFormat, destOffset,
                                                mTexStorage, target, level));
         }
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_Cube::copySubImage(ContextImpl *contextImpl,
                                         GLenum target,
                                         size_t imageLevel,
                                         const gl::Offset &destOffset,
                                         const gl::Rectangle &sourceArea,
                                         const gl::Framebuffer *source)
 {
     int faceIndex = static_cast<int>(gl::CubeMapTextureTargetToLayerIndex(target));

     GLint level          = static_cast<GLint>(imageLevel);
     gl::ImageIndex index = gl::ImageIndex::MakeCube(target, level);

     // If the zero max LOD workaround is active, then we can't sample from individual layers of the framebuffer in shaders,
     // so we should use the non-rendering copy path.
     if (!canCreateRenderTargetForImage(index) || mRenderer->getWorkarounds().zeroMaxLodWorkaround)
     {
         gl::Error error =
             mImageArray[faceIndex][level]->copyFromFramebuffer(destOffset, sourceArea, source);
         if (error.isError())
         {
             return error;
         }

         mDirtyImages = true;
     }
     else
     {
         ANGLE_TRY(ensureRenderTarget());
         if (isValidFaceLevel(faceIndex, level))
         {
             ANGLE_TRY(updateStorageFaceLevel(faceIndex, level));
             ANGLE_TRY(mRenderer->copyImageCube(source, sourceArea,
                                                gl::GetUnsizedFormat(getBaseLevelInternalFormat()),
                                                destOffset, mTexStorage, target, level));
         }
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_Cube::setStorage(ContextImpl *contextImpl,
                                       GLenum target,
                                       size_t levels,
                                       GLenum internalFormat,
                                       const gl::Extents &size)
 {
     ASSERT(size.width == size.height);
     ASSERT(size.depth == 1);

     for (size_t level = 0; level < levels; level++)
     {
         GLsizei mipSize = std::max(1, size.width >> level);
         for (int faceIndex = 0; faceIndex < 6; faceIndex++)
         {
             mImageArray[faceIndex][level]->redefine(GL_TEXTURE_CUBE_MAP, internalFormat, gl::Extents(mipSize, mipSize, 1), true);
         }
     }

     for (size_t level = levels; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
     {
         for (int faceIndex = 0; faceIndex < 6; faceIndex++)
         {
             mImageArray[faceIndex][level]->redefine(GL_TEXTURE_CUBE_MAP, GL_NONE, gl::Extents(0, 0, 0), true);
         }
     }

     // TODO(geofflang): Verify storage creation had no errors
     bool renderTarget = IsRenderTargetUsage(mState.getUsage());

     TextureStorage *storage = mRenderer->createTextureStorageCube(
         internalFormat, renderTarget, size.width, static_cast<int>(levels), false);

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ANGLE_TRY(updateStorage());

     mImmutable = true;

     return gl::NoError();
 }

 // Tests for cube texture completeness. [OpenGL ES 2.0.24] section 3.7.10 page 81.
 bool TextureD3D_Cube::isCubeComplete() const
 {
     int    baseWidth  = getBaseLevelWidth();
     int    baseHeight = getBaseLevelHeight();
     GLenum baseFormat = getBaseLevelInternalFormat();

     if (baseWidth <= 0 || baseWidth != baseHeight)
     {
         return false;
     }

     for (int faceIndex = 1; faceIndex < 6; faceIndex++)
     {
         const ImageD3D &faceBaseImage = *mImageArray[faceIndex][getBaseLevel()];

         if (faceBaseImage.getWidth()          != baseWidth  ||
             faceBaseImage.getHeight()         != baseHeight ||
             faceBaseImage.getInternalFormat() != baseFormat )
         {
             return false;
         }
     }

     return true;
 }

 void TextureD3D_Cube::bindTexImage(egl::Surface *surface)
 {
     UNREACHABLE();
 }

 void TextureD3D_Cube::releaseTexImage()
 {
     UNREACHABLE();
 }

 void TextureD3D_Cube::initMipmapImages()
 {
     const GLuint baseLevel = mState.getEffectiveBaseLevel();
     const GLuint maxLevel  = mState.getMipmapMaxLevel();
     // Purge array levels baseLevel + 1 through q and reset them to represent the generated mipmap
     // levels.
     for (int faceIndex = 0; faceIndex < 6; faceIndex++)
     {
         for (GLuint level = baseLevel + 1; level <= maxLevel; level++)
         {
             int faceLevelSize =
                 (std::max(mImageArray[faceIndex][baseLevel]->getWidth() >> (level - baseLevel), 1));
             redefineImage(faceIndex, level, mImageArray[faceIndex][baseLevel]->getInternalFormat(),
                           gl::Extents(faceLevelSize, faceLevelSize, 1));
         }
     }
 }

 gl::Error TextureD3D_Cube::getRenderTarget(const gl::ImageIndex &index, RenderTargetD3D **outRT)
 {
     ASSERT(gl::IsCubeMapTextureTarget(index.type));

     // ensure the underlying texture is created
     ANGLE_TRY(ensureRenderTarget());
     ANGLE_TRY(updateStorageFaceLevel(index.layerIndex, index.mipIndex));

     return mTexStorage->getRenderTarget(index, outRT);
 }

 gl::Error TextureD3D_Cube::initializeStorage(bool renderTarget)
 {
     // Only initialize the first time this texture is used as a render target or shader resource
     if (mTexStorage)
     {
         return gl::NoError();
     }

     // do not attempt to create storage for nonexistant data
     if (!isFaceLevelComplete(0, getBaseLevel()))
     {
         return gl::NoError();
     }

     bool createRenderTarget = (renderTarget || IsRenderTargetUsage(mState.getUsage()));

     TextureStorage *storage = nullptr;
     ANGLE_TRY(createCompleteStorage(createRenderTarget, &storage));

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ASSERT(mTexStorage);

     // flush image data to the storage
     ANGLE_TRY(updateStorage());

     return gl::NoError();
 }

 gl::Error TextureD3D_Cube::createCompleteStorage(bool renderTarget, TextureStorage **outTexStorage) const
 {
     GLsizei size = getLevelZeroWidth();

     ASSERT(size > 0);

     // use existing storage level count, when previously specified by TexStorage*D
     GLint levels = (mTexStorage ? mTexStorage->getLevelCount() : creationLevels(size, size, 1));

     bool hintLevelZeroOnly = false;
     if (mRenderer->getWorkarounds().zeroMaxLodWorkaround)
     {
         // If any of the CPU images (levels >= 1) are dirty, then the textureStorage should use the mipped texture to begin with.
         // Otherwise, it should use the level-zero-only texture.
         hintLevelZeroOnly = true;
         for (int faceIndex = 0; faceIndex < 6 && hintLevelZeroOnly; faceIndex++)
         {
             for (int level = 1; level < levels && hintLevelZeroOnly; level++)
             {
                 hintLevelZeroOnly = !(mImageArray[faceIndex][level]->isDirty() && isFaceLevelComplete(faceIndex, level));
             }
         }
     }

     // TODO (geofflang): detect if storage creation succeeded
     *outTexStorage = mRenderer->createTextureStorageCube(getBaseLevelInternalFormat(), renderTarget, size, levels, hintLevelZeroOnly);

     return gl::NoError();
 }

 gl::Error TextureD3D_Cube::setCompleteTexStorage(TextureStorage *newCompleteTexStorage)
 {
     if (newCompleteTexStorage && newCompleteTexStorage->isManaged())
     {
         for (int faceIndex = 0; faceIndex < 6; faceIndex++)
         {
             for (int level = 0; level < newCompleteTexStorage->getLevelCount(); level++)
             {
                 ANGLE_TRY(mImageArray[faceIndex][level]->setManagedSurfaceCube(
                     newCompleteTexStorage, faceIndex, level));
             }
         }
     }

     SafeDelete(mTexStorage);
     mTexStorage = newCompleteTexStorage;

     mDirtyImages = true;
     return gl::NoError();
 }

 gl::Error TextureD3D_Cube::updateStorage()
 {
     ASSERT(mTexStorage != nullptr);
     GLint storageLevels = mTexStorage->getLevelCount();
     for (int face = 0; face < 6; face++)
     {
         for (int level = 0; level < storageLevels; level++)
         {
             if (mImageArray[face][level]->isDirty() && isFaceLevelComplete(face, level))
             {
                 ANGLE_TRY(updateStorageFaceLevel(face, level));
             }
         }
     }

     return gl::NoError();
 }

 bool TextureD3D_Cube::isValidFaceLevel(int faceIndex, int level) const
 {
     return (mTexStorage ? (level >= 0 && level < mTexStorage->getLevelCount()) : 0);
 }

 bool TextureD3D_Cube::isFaceLevelComplete(int faceIndex, int level) const
 {
     if (getBaseLevel() >= gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
     {
         return false;
     }
     ASSERT(level >= 0 && faceIndex < 6 && level < (int)ArraySize(mImageArray[faceIndex]) &&
            mImageArray[faceIndex][level] != nullptr);

     if (isImmutable())
     {
         return true;
     }

     int levelZeroSize = getLevelZeroWidth();

     if (levelZeroSize <= 0)
     {
         return false;
     }

     // "isCubeComplete" checks for base level completeness and we must call that
     // to determine if any face at level 0 is complete. We omit that check here
     // to avoid re-checking cube-completeness for every face at level 0.
     if (level == 0)
     {
         return true;
     }

     // Check that non-zero levels are consistent with the base level.
     const ImageD3D *faceLevelImage = mImageArray[faceIndex][level];

     if (faceLevelImage->getInternalFormat() != getBaseLevelInternalFormat())
     {
         return false;
     }

     if (faceLevelImage->getWidth() != std::max(1, levelZeroSize >> level))
     {
         return false;
     }

     return true;
 }

 bool TextureD3D_Cube::isImageComplete(const gl::ImageIndex &index) const
 {
     return isFaceLevelComplete(index.layerIndex, index.mipIndex);
 }

 gl::Error TextureD3D_Cube::updateStorageFaceLevel(int faceIndex, int level)
 {
     ASSERT(level >= 0 && faceIndex < 6 && level < (int)ArraySize(mImageArray[faceIndex]) &&
            mImageArray[faceIndex][level] != nullptr);
     ImageD3D *image = mImageArray[faceIndex][level];

     if (image->isDirty())
     {
         GLenum faceTarget = gl::LayerIndexToCubeMapTextureTarget(faceIndex);
         gl::ImageIndex index = gl::ImageIndex::MakeCube(faceTarget, level);
         gl::Box region(0, 0, 0, image->getWidth(), image->getHeight(), 1);
         ANGLE_TRY(commitRegion(index, region));
     }

     return gl::NoError();
 }

 void TextureD3D_Cube::redefineImage(int faceIndex, GLint level, GLenum internalformat, const gl::Extents &size)
 {
     // If there currently is a corresponding storage texture image, it has these parameters
     const int storageWidth     = std::max(1, getLevelZeroWidth() >> level);
     const int storageHeight    = std::max(1, getLevelZeroHeight() >> level);
     const GLenum storageFormat = getBaseLevelInternalFormat();

     mImageArray[faceIndex][level]->redefine(GL_TEXTURE_CUBE_MAP, internalformat, size, false);

     if (mTexStorage)
     {
         const int storageLevels = mTexStorage->getLevelCount();

         if ((level >= storageLevels && storageLevels != 0) ||
             size.width != storageWidth ||
             size.height != storageHeight ||
             internalformat != storageFormat)   // Discard mismatched storage
         {
             markAllImagesDirty();
             SafeDelete(mTexStorage);
         }
     }
 }

 gl::ImageIndexIterator TextureD3D_Cube::imageIterator() const
 {
     return gl::ImageIndexIterator::MakeCube(0, mTexStorage->getLevelCount());
 }

 gl::ImageIndex TextureD3D_Cube::getImageIndex(GLint mip, GLint layer) const
 {
     // The "layer" of the image index corresponds to the cube face
     return gl::ImageIndex::MakeCube(gl::LayerIndexToCubeMapTextureTarget(layer), mip);
 }

 bool TextureD3D_Cube::isValidIndex(const gl::ImageIndex &index) const
 {
     return (mTexStorage && gl::IsCubeMapTextureTarget(index.type) &&
             index.mipIndex >= 0 && index.mipIndex < mTexStorage->getLevelCount());
 }

 void TextureD3D_Cube::markAllImagesDirty()
 {
     for (int dirtyLevel = 0; dirtyLevel < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; dirtyLevel++)
     {
         for (int dirtyFace = 0; dirtyFace < 6; dirtyFace++)
         {
             mImageArray[dirtyFace][dirtyLevel]->markDirty();
         }
     }
     mDirtyImages = true;
 }

 TextureD3D_3D::TextureD3D_3D(const gl::TextureState &state, RendererD3D *renderer)
     : TextureD3D(state, renderer)
 {
     for (int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++i)
     {
         mImageArray[i] = renderer->createImage();
     }
 }

 TextureD3D_3D::~TextureD3D_3D()
 {
     // Delete the Images before the TextureStorage.
     // Images might be relying on the TextureStorage for some of their data.
     // If TextureStorage is deleted before the Images, then their data will be wastefully copied back from the GPU before we delete the Images.
     for (int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++i)
     {
         delete mImageArray[i];
     }

     SafeDelete(mTexStorage);
 }

 ImageD3D *TextureD3D_3D::getImage(int level, int layer) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT(layer == 0);
     return mImageArray[level];
 }

 ImageD3D *TextureD3D_3D::getImage(const gl::ImageIndex &index) const
 {
     ASSERT(index.mipIndex < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT(!index.hasLayer());
     ASSERT(index.type == GL_TEXTURE_3D);
     return mImageArray[index.mipIndex];
 }

 GLsizei TextureD3D_3D::getLayerCount(int level) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     return 1;
 }

 GLsizei TextureD3D_3D::getWidth(GLint level) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[level]->getWidth();
     else
         return 0;
 }

 GLsizei TextureD3D_3D::getHeight(GLint level) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[level]->getHeight();
     else
         return 0;
 }

 GLsizei TextureD3D_3D::getDepth(GLint level) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[level]->getDepth();
     else
         return 0;
 }

 GLenum TextureD3D_3D::getInternalFormat(GLint level) const
 {
     if (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
         return mImageArray[level]->getInternalFormat();
     else
         return GL_NONE;
 }

 bool TextureD3D_3D::isDepth(GLint level) const
 {
     return gl::GetSizedInternalFormatInfo(getInternalFormat(level)).depthBits > 0;
 }

 gl::Error TextureD3D_3D::setEGLImageTarget(GLenum target, egl::Image *image)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_3D::setImage(ContextImpl *contextImpl,
                                   GLenum target,
                                   size_t imageLevel,
                                   GLenum internalFormat,
                                   const gl::Extents &size,
                                   GLenum format,
                                   GLenum type,
                                   const gl::PixelUnpackState &unpack,
                                   const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_3D);
     const gl::InternalFormat &internalFormatInfo = gl::GetInternalFormatInfo(internalFormat, type);

     GLint level = static_cast<GLint>(imageLevel);
     redefineImage(level, internalFormatInfo.sizedInternalFormat, size);

     bool fastUnpacked = false;

     gl::ImageIndex index = gl::ImageIndex::Make3D(level);

     // Attempt a fast gpu copy of the pixel data to the surface if the app bound an unpack buffer
     if (isFastUnpackable(unpack, internalFormatInfo.sizedInternalFormat) && !size.empty() &&
         isLevelComplete(level))
     {
         // Will try to create RT storage if it does not exist
         RenderTargetD3D *destRenderTarget = nullptr;
         ANGLE_TRY(getRenderTarget(index, &destRenderTarget));

         gl::Box destArea(0, 0, 0, getWidth(level), getHeight(level), getDepth(level));

         ANGLE_TRY(fastUnpackPixels(unpack, pixels, destArea, internalFormatInfo.sizedInternalFormat,
                                    type, destRenderTarget));

         // Ensure we don't overwrite our newly initialized data
         mImageArray[level]->markClean();

         fastUnpacked = true;
     }

     if (!fastUnpacked)
     {
         ANGLE_TRY(setImageImpl(index, type, unpack, pixels, 0));
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_3D::setSubImage(ContextImpl *contextImpl,
                                      GLenum target,
                                      size_t imageLevel,
                                      const gl::Box &area,
                                      GLenum format,
                                      GLenum type,
                                      const gl::PixelUnpackState &unpack,
                                      const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_3D);

     GLint level          = static_cast<GLint>(imageLevel);
     gl::ImageIndex index = gl::ImageIndex::Make3D(level);

     // Attempt a fast gpu copy of the pixel data to the surface if the app bound an unpack buffer
     if (isFastUnpackable(unpack, getInternalFormat(level)) && isLevelComplete(level))
     {
         RenderTargetD3D *destRenderTarget = nullptr;
         ANGLE_TRY(getRenderTarget(index, &destRenderTarget));
         ASSERT(!mImageArray[level]->isDirty());

         return fastUnpackPixels(unpack, pixels, area, getInternalFormat(level), type, destRenderTarget);
     }
     else
     {
         return TextureD3D::subImage(index, area, format, type, unpack, pixels, 0);
     }
 }

 gl::Error TextureD3D_3D::setCompressedImage(ContextImpl *contextImpl,
                                             GLenum target,
                                             size_t imageLevel,
                                             GLenum internalFormat,
                                             const gl::Extents &size,
                                             const gl::PixelUnpackState &unpack,
                                             size_t imageSize,
                                             const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_3D);

     GLint level = static_cast<GLint>(imageLevel);
     // compressed formats don't have separate sized internal formats-- we can just use the compressed format directly
     redefineImage(level, internalFormat, size);

     gl::ImageIndex index = gl::ImageIndex::Make3D(level);
     return setCompressedImageImpl(index, unpack, pixels, 0);
 }

 gl::Error TextureD3D_3D::setCompressedSubImage(ContextImpl *contextImpl,
                                                GLenum target,
                                                size_t level,
                                                const gl::Box &area,
                                                GLenum format,
                                                const gl::PixelUnpackState &unpack,
                                                size_t imageSize,
                                                const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_3D);

     gl::ImageIndex index = gl::ImageIndex::Make3D(static_cast<GLint>(level));
     ANGLE_TRY(TextureD3D::subImageCompressed(index, area, format, unpack, pixels, 0));
     return commitRegion(index, area);
 }

 gl::Error TextureD3D_3D::copyImage(ContextImpl *contextImpl,
                                    GLenum target,
                                    size_t level,
                                    const gl::Rectangle &sourceArea,
                                    GLenum internalFormat,
                                    const gl::Framebuffer *source)
 {
     UNIMPLEMENTED();
     return gl::Error(GL_INVALID_OPERATION, "Copying 3D textures is unimplemented.");
 }

 gl::Error TextureD3D_3D::copySubImage(ContextImpl *contextImpl,
                                       GLenum target,
                                       size_t imageLevel,
                                       const gl::Offset &destOffset,
                                       const gl::Rectangle &sourceArea,
                                       const gl::Framebuffer *source)
 {
     ASSERT(target == GL_TEXTURE_3D);

     GLint level          = static_cast<GLint>(imageLevel);

     // Currently, 3D single-layer blits are broken because we don't know how to make an SRV
     // for a single layer of a 3D texture.
     // TODO(jmadill): Investigate 3D blits in D3D11.
     // gl::ImageIndex index = gl::ImageIndex::Make3D(level);

     // if (!canCreateRenderTargetForImage(index))
     {
         ANGLE_TRY(mImageArray[level]->copyFromFramebuffer(destOffset, sourceArea, source));
         mDirtyImages = true;
     }
     // else
     //{
     //    ANGLE_TRY(ensureRenderTarget());
     //    if (isValidLevel(level))
     //    {
     //        ANGLE_TRY(updateStorageLevel(level));
     //        ANGLE_TRY(mRenderer->copyImage3D(
     //            source, sourceArea,
     //            gl::GetInternalFormatInfo(getBaseLevelInternalFormat()).format,
     //            destOffset, mTexStorage, level));
     //    }
     //}

     return gl::NoError();
 }

 gl::Error TextureD3D_3D::setStorage(ContextImpl *contextImpl,
                                     GLenum target,
                                     size_t levels,
                                     GLenum internalFormat,
                                     const gl::Extents &size)
 {
     ASSERT(target == GL_TEXTURE_3D);

     for (size_t level = 0; level < levels; level++)
     {
         gl::Extents levelSize(std::max(1, size.width >> level),
                               std::max(1, size.height >> level),
                               std::max(1, size.depth >> level));
         mImageArray[level]->redefine(GL_TEXTURE_3D, internalFormat, levelSize, true);
     }

     for (size_t level = levels; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
     {
         mImageArray[level]->redefine(GL_TEXTURE_3D, GL_NONE, gl::Extents(0, 0, 0), true);
     }

     // TODO(geofflang): Verify storage creation had no errors
     bool renderTarget = IsRenderTargetUsage(mState.getUsage());
     TextureStorage *storage =
         mRenderer->createTextureStorage3D(internalFormat, renderTarget, size.width, size.height,
                                           size.depth, static_cast<int>(levels));

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ANGLE_TRY(updateStorage());

     mImmutable = true;

     return gl::NoError();
 }

 void TextureD3D_3D::bindTexImage(egl::Surface *surface)
 {
     UNREACHABLE();
 }

 void TextureD3D_3D::releaseTexImage()
 {
     UNREACHABLE();
 }

 void TextureD3D_3D::initMipmapImages()
 {
     const GLuint baseLevel = mState.getEffectiveBaseLevel();
     const GLuint maxLevel  = mState.getMipmapMaxLevel();
     // Purge array levels baseLevel + 1 through q and reset them to represent the generated mipmap
     // levels.
     for (GLuint level = baseLevel + 1; level <= maxLevel; level++)
     {
         gl::Extents levelSize(std::max(getLevelZeroWidth() >> level, 1),
                               std::max(getLevelZeroHeight() >> level, 1),
                               std::max(getLevelZeroDepth() >> level, 1));
         redefineImage(level, getBaseLevelInternalFormat(), levelSize);
     }
 }

 gl::Error TextureD3D_3D::getRenderTarget(const gl::ImageIndex &index, RenderTargetD3D **outRT)
 {
     // ensure the underlying texture is created
     ANGLE_TRY(ensureRenderTarget());

     if (index.hasLayer())
     {
         ANGLE_TRY(updateStorage());
     }
     else
     {
         ANGLE_TRY(updateStorageLevel(index.mipIndex));
     }

     return mTexStorage->getRenderTarget(index, outRT);
 }

 gl::Error TextureD3D_3D::initializeStorage(bool renderTarget)
 {
     // Only initialize the first time this texture is used as a render target or shader resource
     if (mTexStorage)
     {
         return gl::NoError();
     }

     // do not attempt to create storage for nonexistant data
     if (!isLevelComplete(getBaseLevel()))
     {
         return gl::NoError();
     }

     bool createRenderTarget = (renderTarget || IsRenderTargetUsage(mState.getUsage()));

     TextureStorage *storage = nullptr;
     ANGLE_TRY(createCompleteStorage(createRenderTarget, &storage));

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ASSERT(mTexStorage);

     // flush image data to the storage
     ANGLE_TRY(updateStorage());

     return gl::NoError();
 }

 gl::Error TextureD3D_3D::createCompleteStorage(bool renderTarget, TextureStorage **outStorage) const
 {
     GLsizei width         = getLevelZeroWidth();
     GLsizei height        = getLevelZeroHeight();
     GLsizei depth         = getLevelZeroDepth();
     GLenum internalFormat = getBaseLevelInternalFormat();

     ASSERT(width > 0 && height > 0 && depth > 0);

     // use existing storage level count, when previously specified by TexStorage*D
     GLint levels = (mTexStorage ? mTexStorage->getLevelCount() : creationLevels(width, height, depth));

     // TODO: Verify creation of the storage succeeded
     *outStorage = mRenderer->createTextureStorage3D(internalFormat, renderTarget, width, height, depth, levels);

     return gl::NoError();
 }

 gl::Error TextureD3D_3D::setCompleteTexStorage(TextureStorage *newCompleteTexStorage)
 {
     SafeDelete(mTexStorage);
     mTexStorage = newCompleteTexStorage;
     mDirtyImages = true;

     // We do not support managed 3D storage, as that is D3D9/ES2-only
     ASSERT(!mTexStorage->isManaged());

     return gl::NoError();
 }

 gl::Error TextureD3D_3D::updateStorage()
 {
     ASSERT(mTexStorage != nullptr);
     GLint storageLevels = mTexStorage->getLevelCount();
     for (int level = 0; level < storageLevels; level++)
     {
         if (mImageArray[level]->isDirty() && isLevelComplete(level))
         {
             ANGLE_TRY(updateStorageLevel(level));
         }
     }

     return gl::NoError();
 }

 bool TextureD3D_3D::isValidLevel(int level) const
 {
     return (mTexStorage ? (level >= 0 && level < mTexStorage->getLevelCount()) : 0);
 }

 bool TextureD3D_3D::isLevelComplete(int level) const
 {
     ASSERT(level >= 0 && level < (int)ArraySize(mImageArray) && mImageArray[level] != nullptr);

     if (isImmutable())
     {
         return true;
     }

     GLsizei width  = getLevelZeroWidth();
     GLsizei height = getLevelZeroHeight();
     GLsizei depth  = getLevelZeroDepth();

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

     if (level == static_cast<int>(getBaseLevel()))
     {
         return true;
     }

     ImageD3D *levelImage = mImageArray[level];

     if (levelImage->getInternalFormat() != getBaseLevelInternalFormat())
     {
         return false;
     }

     if (levelImage->getWidth() != std::max(1, width >> level))
     {
         return false;
     }

     if (levelImage->getHeight() != std::max(1, height >> level))
     {
         return false;
     }

     if (levelImage->getDepth() != std::max(1, depth >> level))
     {
         return false;
     }

     return true;
 }

 bool TextureD3D_3D::isImageComplete(const gl::ImageIndex &index) const
 {
     return isLevelComplete(index.mipIndex);
 }

 gl::Error TextureD3D_3D::updateStorageLevel(int level)
 {
     ASSERT(level >= 0 && level < (int)ArraySize(mImageArray) && mImageArray[level] != nullptr);
     ASSERT(isLevelComplete(level));

     if (mImageArray[level]->isDirty())
     {
         gl::ImageIndex index = gl::ImageIndex::Make3D(level);
         gl::Box region(0, 0, 0, getWidth(level), getHeight(level), getDepth(level));
         ANGLE_TRY(commitRegion(index, region));
     }

     return gl::NoError();
 }

 void TextureD3D_3D::redefineImage(GLint level, GLenum internalformat, const gl::Extents &size)
 {
     // If there currently is a corresponding storage texture image, it has these parameters
     const int storageWidth  = std::max(1, getLevelZeroWidth() >> level);
     const int storageHeight = std::max(1, getLevelZeroHeight() >> level);
     const int storageDepth  = std::max(1, getLevelZeroDepth() >> level);
     const GLenum storageFormat = getBaseLevelInternalFormat();

     mImageArray[level]->redefine(GL_TEXTURE_3D, internalformat, size, false);

     if (mTexStorage)
     {
         const int storageLevels = mTexStorage->getLevelCount();

         if ((level >= storageLevels && storageLevels != 0) ||
             size.width != storageWidth ||
             size.height != storageHeight ||
             size.depth != storageDepth ||
             internalformat != storageFormat)   // Discard mismatched storage
         {
             markAllImagesDirty();
             SafeDelete(mTexStorage);
         }
     }
 }

 gl::ImageIndexIterator TextureD3D_3D::imageIterator() const
 {
     return gl::ImageIndexIterator::Make3D(0, mTexStorage->getLevelCount(),
                                           gl::ImageIndex::ENTIRE_LEVEL, gl::ImageIndex::ENTIRE_LEVEL);
 }

 gl::ImageIndex TextureD3D_3D::getImageIndex(GLint mip, GLint /*layer*/) const
 {
     // The "layer" here does not apply to 3D images. We use one Image per mip.
     return gl::ImageIndex::Make3D(mip);
 }

 bool TextureD3D_3D::isValidIndex(const gl::ImageIndex &index) const
 {
     return (mTexStorage && index.type == GL_TEXTURE_3D &&
             index.mipIndex >= 0 && index.mipIndex < mTexStorage->getLevelCount());
 }

 void TextureD3D_3D::markAllImagesDirty()
 {
     for (int i = 0; i < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
     {
         mImageArray[i]->markDirty();
     }
     mDirtyImages = true;
 }

 GLint TextureD3D_3D::getLevelZeroDepth() const
 {
     ASSERT(gl::CountLeadingZeros(static_cast<uint32_t>(getBaseLevelDepth())) > getBaseLevel());
     return getBaseLevelDepth() << getBaseLevel();
 }

 TextureD3D_2DArray::TextureD3D_2DArray(const gl::TextureState &state, RendererD3D *renderer)
     : TextureD3D(state, renderer)
 {
     for (int level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++level)
     {
         mLayerCounts[level] = 0;
         mImageArray[level]  = nullptr;
     }
 }

 TextureD3D_2DArray::~TextureD3D_2DArray()
 {
     // Delete the Images before the TextureStorage.
     // Images might be relying on the TextureStorage for some of their data.
     // If TextureStorage is deleted before the Images, then their data will be wastefully copied back from the GPU before we delete the Images.
     deleteImages();
     SafeDelete(mTexStorage);
 }

 ImageD3D *TextureD3D_2DArray::getImage(int level, int layer) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT((layer == 0 && mLayerCounts[level] == 0) ||
            layer < mLayerCounts[level]);
     return (mImageArray[level] ? mImageArray[level][layer] : nullptr);
 }

 ImageD3D *TextureD3D_2DArray::getImage(const gl::ImageIndex &index) const
 {
     ASSERT(index.mipIndex < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     ASSERT((index.layerIndex == 0 && mLayerCounts[index.mipIndex] == 0) ||
            index.layerIndex < mLayerCounts[index.mipIndex]);
     ASSERT(index.type == GL_TEXTURE_2D_ARRAY);
     return (mImageArray[index.mipIndex] ? mImageArray[index.mipIndex][index.layerIndex] : nullptr);
 }

 GLsizei TextureD3D_2DArray::getLayerCount(int level) const
 {
     ASSERT(level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS);
     return mLayerCounts[level];
 }

 GLsizei TextureD3D_2DArray::getWidth(GLint level) const
 {
     return (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS && mLayerCounts[level] > 0) ? mImageArray[level][0]->getWidth() : 0;
 }

 GLsizei TextureD3D_2DArray::getHeight(GLint level) const
 {
     return (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS && mLayerCounts[level] > 0) ? mImageArray[level][0]->getHeight() : 0;
 }

 GLenum TextureD3D_2DArray::getInternalFormat(GLint level) const
 {
     return (level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS && mLayerCounts[level] > 0) ? mImageArray[level][0]->getInternalFormat() : GL_NONE;
 }

 bool TextureD3D_2DArray::isDepth(GLint level) const
 {
     return gl::GetSizedInternalFormatInfo(getInternalFormat(level)).depthBits > 0;
 }

 gl::Error TextureD3D_2DArray::setEGLImageTarget(GLenum target, egl::Image *image)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_2DArray::setImage(ContextImpl *contextImpl,
                                        GLenum target,
                                        size_t imageLevel,
                                        GLenum internalFormat,
                                        const gl::Extents &size,
                                        GLenum format,
                                        GLenum type,
                                        const gl::PixelUnpackState &unpack,
                                        const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D_ARRAY);

     const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(internalFormat, type);

     GLint level = static_cast<GLint>(imageLevel);
     redefineImage(level, formatInfo.sizedInternalFormat, size);

     GLsizei inputDepthPitch              = 0;
     ANGLE_TRY_RESULT(formatInfo.computeDepthPitch(type, size.width, size.height, unpack.alignment,
                                                   unpack.rowLength, unpack.imageHeight),
                      inputDepthPitch);

     for (int i = 0; i < size.depth; i++)
     {
         const ptrdiff_t layerOffset = (inputDepthPitch * i);
         gl::ImageIndex index = gl::ImageIndex::Make2DArray(level, i);
         ANGLE_TRY(setImageImpl(index, type, unpack, pixels, layerOffset));
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::setSubImage(ContextImpl *contextImpl,
                                           GLenum target,
                                           size_t imageLevel,
                                           const gl::Box &area,
                                           GLenum format,
                                           GLenum type,
                                           const gl::PixelUnpackState &unpack,
                                           const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D_ARRAY);
     GLint level                          = static_cast<GLint>(imageLevel);
     const gl::InternalFormat &formatInfo =
         gl::GetInternalFormatInfo(getInternalFormat(level), type);
     GLsizei inputDepthPitch              = 0;
     ANGLE_TRY_RESULT(formatInfo.computeDepthPitch(type, area.width, area.height, unpack.alignment,
                                                   unpack.rowLength, unpack.imageHeight),
                      inputDepthPitch);

     for (int i = 0; i < area.depth; i++)
     {
         int layer = area.z + i;
         const ptrdiff_t layerOffset = (inputDepthPitch * i);

         gl::Box layerArea(area.x, area.y, 0, area.width, area.height, 1);

         gl::ImageIndex index = gl::ImageIndex::Make2DArray(level, layer);
         ANGLE_TRY(
             TextureD3D::subImage(index, layerArea, format, type, unpack, pixels, layerOffset));
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::setCompressedImage(ContextImpl *contextImpl,
                                                  GLenum target,
                                                  size_t imageLevel,
                                                  GLenum internalFormat,
                                                  const gl::Extents &size,
                                                  const gl::PixelUnpackState &unpack,
                                                  size_t imageSize,
                                                  const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D_ARRAY);

     GLint level = static_cast<GLint>(imageLevel);
     // compressed formats don't have separate sized internal formats-- we can just use the compressed format directly
     redefineImage(level, internalFormat, size);

     const gl::InternalFormat &formatInfo = gl::GetSizedInternalFormatInfo(internalFormat);
     GLsizei inputDepthPitch              = 0;
     ANGLE_TRY_RESULT(
         formatInfo.computeDepthPitch(GL_UNSIGNED_BYTE, size.width, size.height, 1, 0, 0),
         inputDepthPitch);

     for (int i = 0; i < size.depth; i++)
     {
         const ptrdiff_t layerOffset = (inputDepthPitch * i);

         gl::ImageIndex index = gl::ImageIndex::Make2DArray(level, i);
         ANGLE_TRY(setCompressedImageImpl(index, unpack, pixels, layerOffset));
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::setCompressedSubImage(ContextImpl *contextImpl,
                                                     GLenum target,
                                                     size_t level,
                                                     const gl::Box &area,
                                                     GLenum format,
                                                     const gl::PixelUnpackState &unpack,
                                                     size_t imageSize,
                                                     const uint8_t *pixels)
 {
     ASSERT(target == GL_TEXTURE_2D_ARRAY);

     const gl::InternalFormat &formatInfo = gl::GetSizedInternalFormatInfo(format);
     GLsizei inputDepthPitch              = 0;
     ANGLE_TRY_RESULT(
         formatInfo.computeDepthPitch(GL_UNSIGNED_BYTE, area.width, area.height, 1, 0, 0),
         inputDepthPitch);

     for (int i = 0; i < area.depth; i++)
     {
         int layer = area.z + i;
         const ptrdiff_t layerOffset = (inputDepthPitch * i);

         gl::Box layerArea(area.x, area.y, 0, area.width, area.height, 1);

         gl::ImageIndex index = gl::ImageIndex::Make2DArray(static_cast<GLint>(level), layer);
         ANGLE_TRY(
             TextureD3D::subImageCompressed(index, layerArea, format, unpack, pixels, layerOffset));
         ANGLE_TRY(commitRegion(index, layerArea));
     }

     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::copyImage(ContextImpl *contextImpl,
                                         GLenum target,
                                         size_t level,
                                         const gl::Rectangle &sourceArea,
                                         GLenum internalFormat,
                                         const gl::Framebuffer *source)
 {
     UNIMPLEMENTED();
     return gl::Error(GL_INVALID_OPERATION, "Copying 2D array textures is unimplemented.");
 }

 gl::Error TextureD3D_2DArray::copySubImage(ContextImpl *contextImpl,
                                            GLenum target,
                                            size_t imageLevel,
                                            const gl::Offset &destOffset,
                                            const gl::Rectangle &sourceArea,
                                            const gl::Framebuffer *source)
 {
     ASSERT(target == GL_TEXTURE_2D_ARRAY);

     GLint level          = static_cast<GLint>(imageLevel);
     gl::ImageIndex index = gl::ImageIndex::Make2DArray(level, destOffset.z);

     if (!canCreateRenderTargetForImage(index))
     {
         gl::Offset destLayerOffset(destOffset.x, destOffset.y, 0);
         ANGLE_TRY(mImageArray[level][destOffset.z]->copyFromFramebuffer(destLayerOffset, sourceArea,
                                                                         source));
         mDirtyImages = true;
     }
     else
     {
         ANGLE_TRY(ensureRenderTarget());

         if (isValidLevel(level))
         {
             ANGLE_TRY(updateStorageLevel(level));
             ANGLE_TRY(mRenderer->copyImage2DArray(
                 source, sourceArea, gl::GetUnsizedFormat(getInternalFormat(getBaseLevel())),
                 destOffset, mTexStorage, level));
         }
     }
     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::setStorage(ContextImpl *contextImpl,
                                          GLenum target,
                                          size_t levels,
                                          GLenum internalFormat,
                                          const gl::Extents &size)
 {
     ASSERT(target == GL_TEXTURE_2D_ARRAY);

     deleteImages();

     for (size_t level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; level++)
     {
         gl::Extents levelLayerSize(std::max(1, size.width >> level),
                                    std::max(1, size.height >> level),
                                    1);

         mLayerCounts[level] = (level < levels ? size.depth : 0);

         if (mLayerCounts[level] > 0)
         {
             // Create new images for this level
             mImageArray[level] = new ImageD3D*[mLayerCounts[level]];

             for (int layer = 0; layer < mLayerCounts[level]; layer++)
             {
                 mImageArray[level][layer] = mRenderer->createImage();
                 mImageArray[level][layer]->redefine(GL_TEXTURE_2D_ARRAY, internalFormat, levelLayerSize, true);
             }
         }
     }

     // TODO(geofflang): Verify storage creation had no errors
     bool renderTarget = IsRenderTargetUsage(mState.getUsage());
     TextureStorage *storage =
         mRenderer->createTextureStorage2DArray(internalFormat, renderTarget, size.width,
                                                size.height, size.depth, static_cast<int>(levels));

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ANGLE_TRY(updateStorage());

     mImmutable = true;

     return gl::NoError();
 }

 void TextureD3D_2DArray::bindTexImage(egl::Surface *surface)
 {
     UNREACHABLE();
 }

 void TextureD3D_2DArray::releaseTexImage()
 {
     UNREACHABLE();
 }

 void TextureD3D_2DArray::initMipmapImages()
 {
     const GLuint baseLevel = mState.getEffectiveBaseLevel();
     const GLuint maxLevel  = mState.getMipmapMaxLevel();
     int baseWidth     = getLevelZeroWidth();
     int baseHeight    = getLevelZeroHeight();
     int baseDepth     = getLayerCount(getBaseLevel());
     GLenum baseFormat = getBaseLevelInternalFormat();

     // Purge array levels baseLevel + 1 through q and reset them to represent the generated mipmap
     // levels.
     for (GLuint level = baseLevel + 1u; level <= maxLevel; level++)
     {
         ASSERT((baseWidth >> level) > 0 || (baseHeight >> level) > 0);
         gl::Extents levelLayerSize(std::max(baseWidth >> level, 1),
                                    std::max(baseHeight >> level, 1),
                                    baseDepth);
         redefineImage(level, baseFormat, levelLayerSize);
     }
 }

 gl::Error TextureD3D_2DArray::getRenderTarget(const gl::ImageIndex &index, RenderTargetD3D **outRT)
 {
     // ensure the underlying texture is created
     ANGLE_TRY(ensureRenderTarget());
     ANGLE_TRY(updateStorageLevel(index.mipIndex));
     return mTexStorage->getRenderTarget(index, outRT);
 }

 gl::Error TextureD3D_2DArray::initializeStorage(bool renderTarget)
 {
     // Only initialize the first time this texture is used as a render target or shader resource
     if (mTexStorage)
     {
         return gl::NoError();
     }

     // do not attempt to create storage for nonexistant data
     if (!isLevelComplete(getBaseLevel()))
     {
         return gl::NoError();
     }

     bool createRenderTarget = (renderTarget || IsRenderTargetUsage(mState.getUsage()));

     TextureStorage *storage = nullptr;
     ANGLE_TRY(createCompleteStorage(createRenderTarget, &storage));

     gl::Error error = setCompleteTexStorage(storage);
     if (error.isError())
     {
         SafeDelete(storage);
         return error;
     }

     ASSERT(mTexStorage);

     // flush image data to the storage
     ANGLE_TRY(updateStorage());

     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::createCompleteStorage(bool renderTarget, TextureStorage **outStorage) const
 {
     GLsizei width         = getLevelZeroWidth();
     GLsizei height        = getLevelZeroHeight();
     GLsizei depth         = getLayerCount(getBaseLevel());
     GLenum internalFormat = getBaseLevelInternalFormat();

     ASSERT(width > 0 && height > 0 && depth > 0);

     // use existing storage level count, when previously specified by TexStorage*D
     GLint levels = (mTexStorage ? mTexStorage->getLevelCount() : creationLevels(width, height, 1));

     // TODO(geofflang): Verify storage creation succeeds
     *outStorage = mRenderer->createTextureStorage2DArray(internalFormat, renderTarget, width, height, depth, levels);

     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::setCompleteTexStorage(TextureStorage *newCompleteTexStorage)
 {
     SafeDelete(mTexStorage);
     mTexStorage = newCompleteTexStorage;
     mDirtyImages = true;

     // We do not support managed 2D array storage, as managed storage is ES2/D3D9 only
     ASSERT(!mTexStorage->isManaged());

     return gl::NoError();
 }

 gl::Error TextureD3D_2DArray::updateStorage()
 {
     ASSERT(mTexStorage != nullptr);
     GLint storageLevels = mTexStorage->getLevelCount();
     for (int level = 0; level < storageLevels; level++)
     {
         if (isLevelComplete(level))
         {
             ANGLE_TRY(updateStorageLevel(level));
         }
     }

     return gl::NoError();
 }

 bool TextureD3D_2DArray::isValidLevel(int level) const
 {
     return (mTexStorage ? (level >= 0 && level < mTexStorage->getLevelCount()) : 0);
 }

 bool TextureD3D_2DArray::isLevelComplete(int level) const
 {
     ASSERT(level >= 0 && level < (int)ArraySize(mImageArray));

     if (isImmutable())
     {
         return true;
     }

     GLsizei width  = getLevelZeroWidth();
     GLsizei height = getLevelZeroHeight();

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

     // Layers check needs to happen after the above checks, otherwise out-of-range base level may be
     // queried.
     GLsizei layers = getLayerCount(getBaseLevel());

     if (layers <= 0)
     {
         return false;
     }

     if (level == static_cast<int>(getBaseLevel()))
     {
         return true;
     }

     if (getInternalFormat(level) != getInternalFormat(getBaseLevel()))
     {
         return false;
     }

     if (getWidth(level) != std::max(1, width >> level))
     {
         return false;
     }

     if (getHeight(level) != std::max(1, height >> level))
     {
         return false;
     }

     if (getLayerCount(level) != layers)
     {
         return false;
     }

     return true;
 }

 bool TextureD3D_2DArray::isImageComplete(const gl::ImageIndex &index) const
 {
     return isLevelComplete(index.mipIndex);
 }

 gl::Error TextureD3D_2DArray::updateStorageLevel(int level)
 {
     ASSERT(level >= 0 && level < (int)ArraySize(mLayerCounts));
     ASSERT(isLevelComplete(level));

     for (int layer = 0; layer < mLayerCounts[level]; layer++)
     {
         ASSERT(mImageArray[level] != nullptr && mImageArray[level][layer] != nullptr);
         if (mImageArray[level][layer]->isDirty())
         {
             gl::ImageIndex index = gl::ImageIndex::Make2DArray(level, layer);
             gl::Box region(0, 0, 0, getWidth(level), getHeight(level), 1);
             ANGLE_TRY(commitRegion(index, region));
         }
     }

     return gl::NoError();
 }

 void TextureD3D_2DArray::deleteImages()
 {
     for (int level = 0; level < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; ++level)
     {
         for (int layer = 0; layer < mLayerCounts[level]; ++layer)
         {
             delete mImageArray[level][layer];
         }
         delete[] mImageArray[level];
         mImageArray[level]  = nullptr;
         mLayerCounts[level] = 0;
     }
 }

 void TextureD3D_2DArray::redefineImage(GLint level, GLenum internalformat, const gl::Extents &size)
 {
     // If there currently is a corresponding storage texture image, it has these parameters
     const int storageWidth  = std::max(1, getLevelZeroWidth() >> level);
     const int storageHeight = std::max(1, getLevelZeroHeight() >> level);
     const GLuint baseLevel  = getBaseLevel();
     int storageDepth = 0;
     if (baseLevel < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
     {
         storageDepth = getLayerCount(baseLevel);
     }

     // Only reallocate the layers if the size doesn't match
     if (size.depth != mLayerCounts[level])
     {
         for (int layer = 0; layer < mLayerCounts[level]; layer++)
         {
             SafeDelete(mImageArray[level][layer]);
         }
         SafeDeleteArray(mImageArray[level]);
         mLayerCounts[level] = size.depth;

         if (size.depth > 0)
         {
             mImageArray[level] = new ImageD3D*[size.depth];
             for (int layer = 0; layer < mLayerCounts[level]; layer++)
             {
                 mImageArray[level][layer] = mRenderer->createImage();
             }
         }
     }

     if (size.depth > 0)
     {
         for (int layer = 0; layer < mLayerCounts[level]; layer++)
         {
             mImageArray[level][layer]->redefine(GL_TEXTURE_2D_ARRAY, internalformat,
                                                 gl::Extents(size.width, size.height, 1), false);
         }
     }

     if (mTexStorage)
     {
         const GLenum storageFormat = getBaseLevelInternalFormat();
         const int storageLevels = mTexStorage->getLevelCount();

         if ((level >= storageLevels && storageLevels != 0) ||
             size.width != storageWidth ||
             size.height != storageHeight ||
             size.depth != storageDepth ||
             internalformat != storageFormat)   // Discard mismatched storage
         {
             markAllImagesDirty();
             SafeDelete(mTexStorage);
         }
     }
 }

 gl::ImageIndexIterator TextureD3D_2DArray::imageIterator() const
 {
     return gl::ImageIndexIterator::Make2DArray(0, mTexStorage->getLevelCount(), mLayerCounts);
 }

 gl::ImageIndex TextureD3D_2DArray::getImageIndex(GLint mip, GLint layer) const
 {
     return gl::ImageIndex::Make2DArray(mip, layer);
 }

 bool TextureD3D_2DArray::isValidIndex(const gl::ImageIndex &index) const
 {
     // Check for having a storage and the right type of index
     if (!mTexStorage || index.type != GL_TEXTURE_2D_ARRAY)
     {
         return false;
     }

     // Check the mip index
     if (index.mipIndex < 0 || index.mipIndex >= mTexStorage->getLevelCount())
     {
         return false;
     }

     // Check the layer index
     return (!index.hasLayer() || (index.layerIndex >= 0 && index.layerIndex < mLayerCounts[index.mipIndex]));
 }

 void TextureD3D_2DArray::markAllImagesDirty()
 {
     for (int dirtyLevel = 0; dirtyLevel < gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS; dirtyLevel++)
     {
         for (int dirtyLayer = 0; dirtyLayer < mLayerCounts[dirtyLevel]; dirtyLayer++)
         {
             mImageArray[dirtyLevel][dirtyLayer]->markDirty();
         }
     }
     mDirtyImages = true;
 }

 TextureD3D_External::TextureD3D_External(const gl::TextureState &state, RendererD3D *renderer)
     : TextureD3D(state, renderer)
 {
 }

 TextureD3D_External::~TextureD3D_External()
 {
     SafeDelete(mTexStorage);
 }

 ImageD3D *TextureD3D_External::getImage(const gl::ImageIndex &index) const
 {
     UNREACHABLE();
     return nullptr;
 }

 GLsizei TextureD3D_External::getLayerCount(int level) const
 {
     return 1;
 }

 gl::Error TextureD3D_External::setImage(ContextImpl *contextImpl,
                                         GLenum target,
                                         size_t imageLevel,
                                         GLenum internalFormat,
                                         const gl::Extents &size,
                                         GLenum format,
                                         GLenum type,
                                         const gl::PixelUnpackState &unpack,
                                         const uint8_t *pixels)
 {
     // Image setting is not supported for external images
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_External::setSubImage(ContextImpl *contextImpl,
                                            GLenum target,
                                            size_t imageLevel,
                                            const gl::Box &area,
                                            GLenum format,
                                            GLenum type,
                                            const gl::PixelUnpackState &unpack,
                                            const uint8_t *pixels)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_External::setCompressedImage(ContextImpl *contextImpl,
                                                   GLenum target,
                                                   size_t imageLevel,
                                                   GLenum internalFormat,
                                                   const gl::Extents &size,
                                                   const gl::PixelUnpackState &unpack,
                                                   size_t imageSize,
                                                   const uint8_t *pixels)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_External::setCompressedSubImage(ContextImpl *contextImpl,
                                                      GLenum target,
                                                      size_t level,
                                                      const gl::Box &area,
                                                      GLenum format,
                                                      const gl::PixelUnpackState &unpack,
                                                      size_t imageSize,
                                                      const uint8_t *pixels)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_External::copyImage(ContextImpl *contextImpl,
                                          GLenum target,
                                          size_t imageLevel,
                                          const gl::Rectangle &sourceArea,
                                          GLenum internalFormat,
                                          const gl::Framebuffer *source)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_External::copySubImage(ContextImpl *contextImpl,
                                             GLenum target,
                                             size_t imageLevel,
                                             const gl::Offset &destOffset,
                                             const gl::Rectangle &sourceArea,
                                             const gl::Framebuffer *source)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_External::setStorage(ContextImpl *contextImpl,
                                           GLenum target,
                                           size_t levels,
                                           GLenum internalFormat,
                                           const gl::Extents &size)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 gl::Error TextureD3D_External::setImageExternal(GLenum target,
                                                 egl::Stream *stream,
                                                 const egl::Stream::GLTextureDescription &desc)
 {
     ASSERT(target == GL_TEXTURE_EXTERNAL_OES);

     SafeDelete(mTexStorage);

     // If the stream is null, the external image is unbound and we release the storage
     if (stream != nullptr)
     {
         mTexStorage = mRenderer->createTextureStorageExternal(stream, desc);
     }

     return gl::NoError();
 }

 void TextureD3D_External::bindTexImage(egl::Surface *surface)
 {
     UNREACHABLE();
 }

 void TextureD3D_External::releaseTexImage()
 {
     UNREACHABLE();
 }

 gl::Error TextureD3D_External::setEGLImageTarget(GLenum target, egl::Image *image)
 {
     EGLImageD3D *eglImaged3d = GetImplAs<EGLImageD3D>(image);

     // Pass in the RenderTargetD3D here: createTextureStorage can't generate an error.
     RenderTargetD3D *renderTargetD3D = nullptr;
     ANGLE_TRY(eglImaged3d->getRenderTarget(&renderTargetD3D));

     SafeDelete(mTexStorage);
     mTexStorage = mRenderer->createTextureStorageEGLImage(eglImaged3d, renderTargetD3D);

     return gl::NoError();
 }

 void TextureD3D_External::initMipmapImages()
 {
     UNREACHABLE();
 }

 gl::Error TextureD3D_External::getRenderTarget(const gl::ImageIndex &index, RenderTargetD3D **outRT)
 {
     UNREACHABLE();
     return gl::Error(GL_INVALID_OPERATION);
 }

 bool TextureD3D_External::isImageComplete(const gl::ImageIndex &index) const
 {
     return (index.mipIndex == 0) ? (mTexStorage != nullptr) : false;
 }

 gl::Error TextureD3D_External::initializeStorage(bool renderTarget)
 {
     // Texture storage is created when an external image is bound
     ASSERT(mTexStorage);
     return gl::NoError();
 }

 gl::Error TextureD3D_External::createCompleteStorage(bool renderTarget,
                                                      TextureStorage **outTexStorage) const
 {
     UNREACHABLE();
     return gl::NoError();
 }

 gl::Error TextureD3D_External::setCompleteTexStorage(TextureStorage *newCompleteTexStorage)
 {
     UNREACHABLE();
     return gl::NoError();
 }

 gl::Error TextureD3D_External::updateStorage()
 {
     // Texture storage does not need to be updated since it is already loaded with the latest
     // external image
     ASSERT(mTexStorage);
     return gl::NoError();
 }

 gl::ImageIndexIterator TextureD3D_External::imageIterator() const
 {
     return gl::ImageIndexIterator::Make2D(0, mTexStorage->getLevelCount());
 }

 gl::ImageIndex TextureD3D_External::getImageIndex(GLint mip, GLint /*layer*/) const
 {
     // "layer" does not apply to 2D Textures.
     return gl::ImageIndex::Make2D(mip);
 }

 bool TextureD3D_External::isValidIndex(const gl::ImageIndex &index) const
 {
     return (mTexStorage && index.type == GL_TEXTURE_EXTERNAL_OES && index.mipIndex == 0);
 }

 void TextureD3D_External::markAllImagesDirty()
 {
     UNREACHABLE();
 }
 }  // namespace rx