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      1 //
      2 // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
      3 // Use of this source code is governed by a BSD-style license that can be
      4 // found in the LICENSE file.
      5 //
      6 
      7 // FramebufferAttachment.h: Defines the wrapper class gl::FramebufferAttachment, as well as the
      8 // objects and related functionality. [OpenGL ES 2.0.24] section 4.4.3 page 108.
      9 
     10 #ifndef LIBGLESV2_FRAMEBUFFERATTACHMENT_H_
     11 #define LIBGLESV2_FRAMEBUFFERATTACHMENT_H_
     12 
     13 #include "common/angleutils.h"
     14 #include "common/RefCountObject.h"
     15 #include "Texture.h"
     16 
     17 #include "angle_gl.h"
     18 
     19 namespace rx
     20 {
     21 class Renderer;
     22 class RenderTarget;
     23 class TextureStorage;
     24 }
     25 
     26 namespace gl
     27 {
     28 class Renderbuffer;
     29 
     30 // FramebufferAttachment implements a GL framebuffer attachment.
     31 // Attachments are "light" containers, which store pointers to ref-counted GL objects.
     32 // We support GL texture (2D/3D/Cube/2D array) and renderbuffer object attachments.
     33 // Note: Our old naming scheme used the term "Renderbuffer" for both GL renderbuffers and for
     34 // framebuffer attachments, which confused their usage.
     35 
     36 class FramebufferAttachment
     37 {
     38   public:
     39     explicit FramebufferAttachment(GLenum binding);
     40     virtual ~FramebufferAttachment();
     41 
     42     // Helper methods
     43     GLuint getRedSize() const;
     44     GLuint getGreenSize() const;
     45     GLuint getBlueSize() const;
     46     GLuint getAlphaSize() const;
     47     GLuint getDepthSize() const;
     48     GLuint getStencilSize() const;
     49     GLenum getComponentType() const;
     50     GLenum getColorEncoding() const;
     51     bool isTexture() const;
     52 
     53     bool isTextureWithId(GLuint textureId) const { return isTexture() && id() == textureId; }
     54     bool isRenderbufferWithId(GLuint renderbufferId) const { return !isTexture() && id() == renderbufferId; }
     55 
     56     GLenum getBinding() const { return mBinding; }
     57 
     58     // Child class interface
     59     virtual GLsizei getWidth() const = 0;
     60     virtual GLsizei getHeight() const = 0;
     61     virtual GLenum getInternalFormat() const = 0;
     62     virtual GLenum getActualFormat() const = 0;
     63     virtual GLsizei getSamples() const = 0;
     64 
     65     virtual GLuint id() const = 0;
     66     virtual GLenum type() const = 0;
     67     virtual GLint mipLevel() const = 0;
     68     virtual GLint layer() const = 0;
     69 
     70     virtual Texture *getTexture() = 0;
     71     virtual const ImageIndex *getTextureImageIndex() const = 0;
     72     virtual Renderbuffer *getRenderbuffer() = 0;
     73 
     74   private:
     75     DISALLOW_COPY_AND_ASSIGN(FramebufferAttachment);
     76 
     77     GLenum mBinding;
     78 };
     79 
     80 class TextureAttachment : public FramebufferAttachment
     81 {
     82   public:
     83     TextureAttachment(GLenum binding, Texture *texture, const ImageIndex &index);
     84     virtual ~TextureAttachment();
     85 
     86     virtual GLsizei getSamples() const;
     87     virtual GLuint id() const;
     88 
     89     virtual GLsizei getWidth() const;
     90     virtual GLsizei getHeight() const;
     91     virtual GLenum getInternalFormat() const;
     92     virtual GLenum getActualFormat() const;
     93 
     94     virtual GLenum type() const;
     95     virtual GLint mipLevel() const;
     96     virtual GLint layer() const;
     97 
     98     virtual Texture *getTexture();
     99     virtual const ImageIndex *getTextureImageIndex() const;
    100     virtual Renderbuffer *getRenderbuffer();
    101 
    102   private:
    103     DISALLOW_COPY_AND_ASSIGN(TextureAttachment);
    104 
    105     BindingPointer<Texture> mTexture;
    106     ImageIndex mIndex;
    107 };
    108 
    109 class RenderbufferAttachment : public FramebufferAttachment
    110 {
    111   public:
    112     RenderbufferAttachment(GLenum binding, Renderbuffer *renderbuffer);
    113 
    114     virtual ~RenderbufferAttachment();
    115 
    116     virtual GLsizei getWidth() const;
    117     virtual GLsizei getHeight() const;
    118     virtual GLenum getInternalFormat() const;
    119     virtual GLenum getActualFormat() const;
    120     virtual GLsizei getSamples() const;
    121 
    122     virtual GLuint id() const;
    123     virtual GLenum type() const;
    124     virtual GLint mipLevel() const;
    125     virtual GLint layer() const;
    126 
    127     virtual Texture *getTexture();
    128     virtual const ImageIndex *getTextureImageIndex() const;
    129     virtual Renderbuffer *getRenderbuffer();
    130 
    131   private:
    132     DISALLOW_COPY_AND_ASSIGN(RenderbufferAttachment);
    133 
    134     BindingPointer<Renderbuffer> mRenderbuffer;
    135 };
    136 
    137 }
    138 
    139 #endif // LIBGLESV2_FRAMEBUFFERATTACHMENT_H_
    140