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

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• Author : Jamie Madill
  Date : 2015-04-20 12:53:28
  Hash : 2d06b738
  Message : Store value types for FBO attachments. *re-land with fix for Mac* This prevents us from re-allocating FBO attachments every set. This change requires quite a bit of refactoring. BUG=angleproject:963 Change-Id: Ia1f83e3c427d446ddbe16c6703db136942149e91 Reviewed-on: https://chromium-review.googlesource.com/266691 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>

• src/libANGLE/FramebufferAttachment.h

• //
  // Copyright (c) 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.
  //
  
  // FramebufferAttachment.h: Defines the wrapper class gl::FramebufferAttachment, as well as the
  // objects and related functionality. [OpenGL ES 2.0.24] section 4.4.3 page 108.
  
  #ifndef LIBANGLE_FRAMEBUFFERATTACHMENT_H_
  #define LIBANGLE_FRAMEBUFFERATTACHMENT_H_
  
  #include "angle_gl.h"
  #include "common/angleutils.h"
  #include "libANGLE/ImageIndex.h"
  #include "libANGLE/RefCountObject.h"
  
  namespace egl
  {
  class Surface;
  }
  
  namespace gl
  {
  class FramebufferAttachmentObject;
  class Renderbuffer;
  class Texture;
  
  // FramebufferAttachment implements a GL framebuffer attachment.
  // Attachments are "light" containers, which store pointers to ref-counted GL objects.
  // We support GL texture (2D/3D/Cube/2D array) and renderbuffer object attachments.
  // Note: Our old naming scheme used the term "Renderbuffer" for both GL renderbuffers and for
  // framebuffer attachments, which confused their usage.
  
  class FramebufferAttachment final
  {
    public:
      FramebufferAttachment();
  
      FramebufferAttachment(GLenum type,
                            GLenum binding,
                            const ImageIndex &textureIndex,
                            FramebufferAttachmentObject *resource);
  
      FramebufferAttachment(const FramebufferAttachment &other)
         : mType(other.mType),
           mTarget(other.mTarget)
      {
          mResource.set(other.mResource.get());
      }
  
      FramebufferAttachment &operator=(const FramebufferAttachment &other)
      {
          mType = other.mType;
          mTarget = other.mTarget;
          mResource.set(other.mResource.get());
          return *this;
      }
  
      ~FramebufferAttachment();
  
      // A framebuffer attachment points to one of three types of resources: Renderbuffers,
      // Textures and egl::Surface. The "Target" struct indicates which part of the
      // object an attachment references. For the three types:
      //   - a Renderbuffer has a unique renderable target, and needs no target index
      //   - a Texture has targets for every image and uses an ImageIndex
      //   - a Surface has targets for Color and Depth/Stencil, and uses the attachment binding
      class Target
      {
        public:
          Target(GLenum binding, const ImageIndex &imageIndex);
          Target(const Target &other);
          Target &operator=(const Target &other);
  
          GLenum binding() const { return mBinding; }
          const ImageIndex &textureIndex() const { return mTextureIndex; }
  
        private:
          GLenum mBinding;
          ImageIndex mTextureIndex;
      };
  
      void detach();
      void attach(GLenum type,
                  GLenum binding,
                  const ImageIndex &textureIndex,
                  FramebufferAttachmentObject *resource);
  
      // Helper methods
      GLuint getRedSize() const;
      GLuint getGreenSize() const;
      GLuint getBlueSize() const;
      GLuint getAlphaSize() const;
      GLuint getDepthSize() const;
      GLuint getStencilSize() const;
      GLenum getComponentType() const;
      GLenum getColorEncoding() const;
  
      bool isTextureWithId(GLuint textureId) const { return mType == GL_TEXTURE && id() == textureId; }
      bool isRenderbufferWithId(GLuint renderbufferId) const { return mType == GL_RENDERBUFFER && id() == renderbufferId; }
  
      GLenum getBinding() const { return mTarget.binding(); }
      GLuint id() const { return mResource.id(); }
  
      // These methods are only legal to call on Texture attachments
      const ImageIndex &getTextureImageIndex() const;
      GLenum cubeMapFace() const;
      GLint mipLevel() const;
      GLint layer() const;
  
      GLsizei getWidth() const;
      GLsizei getHeight() const;
      GLenum getInternalFormat() const;
      GLsizei getSamples() const;
      GLenum type() const { return mType; }
      bool isAttached() const { return mType != GL_NONE; }
  
      Renderbuffer *getRenderbuffer() const;
      Texture *getTexture() const;
      const egl::Surface *getSurface() const;
  
    private:
      GLenum mType;
      Target mTarget;
      BindingPointer<FramebufferAttachmentObject> mResource;
  };
  
  // A base class for objects that FBO Attachments may point to.
  class FramebufferAttachmentObject : public RefCountObject
  {
    public:
      FramebufferAttachmentObject(GLuint id) : RefCountObject(id) {}
  
      virtual GLsizei getAttachmentWidth(const FramebufferAttachment::Target &target) const = 0;
      virtual GLsizei getAttachmentHeight(const FramebufferAttachment::Target &target) const = 0;
      virtual GLenum getAttachmentInternalFormat(const FramebufferAttachment::Target &target) const = 0;
      virtual GLsizei getAttachmentSamples(const FramebufferAttachment::Target &target) const = 0;
  };
  
  inline GLsizei FramebufferAttachment::getWidth() const
  {
      return mResource->getAttachmentWidth(mTarget);
  }
  
  inline GLsizei FramebufferAttachment::getHeight() const
  {
      return mResource->getAttachmentHeight(mTarget);
  }
  
  inline GLenum FramebufferAttachment::getInternalFormat() const
  {
      return mResource->getAttachmentInternalFormat(mTarget);
  }
  
  inline GLsizei FramebufferAttachment::getSamples() const
  {
      return mResource->getAttachmentSamples(mTarget);
  }
  
  }
  
  #endif // LIBANGLE_FRAMEBUFFERATTACHMENT_H_