kc3-lang/angle/src/libANGLE/Image.h

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• Hash : 05b35b21
  Author :
  Date : 2017-10-03T09:01:44
  

  D3D11: Lazy robust resource init.
  
  This patch moves the robust resource init logic to the GL front-end.
  Instead of initializing texture resources immediately on creation in
  D3D11, it defers the clear until before a draw call in some cases, or
  skips the update if we can determine if a texture (or other resource)
  has been fully initialized.
  
  Currently lazy init is only implemented for Textures, Renderbuffers,
  and Surfaces.
  
  Various places where lazy resource init is triggered:
  * Framebuffer operations (Draw, Blit, CopyTexImage, Clear, ReadPixels)
  * Texture operations (SubImage, GenerateMipmap, CopyTexImage)
  
  Some efficiency gains remain to be implemented, such as when a
  SubImage call fills the entire object. Similarly for Blit, and a few
  other operations. In these cases we can skip lazy init as an
  optimization. Edge cases with EGLImage are mostly untested.
  
  BUG=angleproject:2107
  
  Change-Id: I2bf3a69b1eae0d4feeb5b17daca23451f1037be8
  Reviewed-on: https://chromium-review.googlesource.com/576058
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  

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• src/libANGLE/Image.h

• //
  // Copyright (c) 2015 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.
  //
  
  // Image.h: Defines the egl::Image class representing the EGLimage object.
  
  #ifndef LIBANGLE_IMAGE_H_
  #define LIBANGLE_IMAGE_H_
  
  #include "common/angleutils.h"
  #include "libANGLE/AttributeMap.h"
  #include "libANGLE/Error.h"
  #include "libANGLE/FramebufferAttachment.h"
  #include "libANGLE/RefCountObject.h"
  #include "libANGLE/formatutils.h"
  
  #include <set>
  
  namespace rx
  {
  class EGLImplFactory;
  class ImageImpl;
  }
  
  namespace egl
  {
  class Image;
  
  // Only currently Renderbuffers and Textures can be bound with images. This makes the relationship
  // explicit, and also ensures that an image sibling can determine if it's been initialized or not,
  // which is important for the robust resource init extension with Textures and EGLImages.
  class ImageSibling : public gl::RefCountObject, public gl::FramebufferAttachmentObject
  {
    public:
      ImageSibling(GLuint id);
      virtual ~ImageSibling();
  
      bool isEGLImageTarget() const;
      gl::InitState sourceEGLImageInitState() const;
      void setSourceEGLImageInitState(gl::InitState initState) const;
  
    protected:
      // Set the image target of this sibling
      void setTargetImage(const gl::Context *context, egl::Image *imageTarget);
  
      // Orphan all EGL image sources and targets
      gl::Error orphanImages(const gl::Context *context);
  
    private:
      friend class Image;
  
      // Called from Image only to add a new source image
      void addImageSource(egl::Image *imageSource);
  
      // Called from Image only to remove a source image when the Image is being deleted
      void removeImageSource(egl::Image *imageSource);
  
      std::set<Image *> mSourcesOf;
      gl::BindingPointer<Image> mTargetOf;
  };
  
  struct ImageState : private angle::NonCopyable
  {
      ImageState(EGLenum target, ImageSibling *buffer, const AttributeMap &attribs);
  
      gl::ImageIndex imageIndex;
      gl::BindingPointer<ImageSibling> source;
      std::set<ImageSibling *> targets;
  };
  
  class Image final : public gl::RefCountObject
  {
    public:
      Image(rx::EGLImplFactory *factory,
            EGLenum target,
            ImageSibling *buffer,
            const AttributeMap &attribs);
  
      gl::Error onDestroy(const gl::Context *context) override;
      ~Image();
  
      const gl::Format &getFormat() const;
      size_t getWidth() const;
      size_t getHeight() const;
      size_t getSamples() const;
  
      Error initialize();
  
      rx::ImageImpl *getImplementation() const;
  
      bool orphaned() const;
      gl::InitState sourceInitState() const;
      void setInitState(gl::InitState initState);
  
    private:
      friend class ImageSibling;
  
      // Called from ImageSibling only notify the image that a new target sibling exists for state
      // tracking.
      void addTargetSibling(ImageSibling *sibling);
  
      // Called from ImageSibling only to notify the image that a sibling (source or target) has
      // been respecified and state tracking should be updated.
      gl::Error orphanSibling(const gl::Context *context, ImageSibling *sibling);
  
      ImageState mState;
      rx::ImageImpl *mImplementation;
      bool mOrphanedAndNeedsInit;
  };
  }  // namespace egl
  
  #endif  // LIBANGLE_IMAGE_H_
  

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