kc3-lang/angle/src/libGLESv2/renderer/VertexBuffer.h

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• Hash : 4150d362
  Author :
  Date : 2012-12-20T21:07:43
  

  Change VertexBufferInterface and VertexDataManager to use new VertexBuffer.
  
  TRAC #22226
  
  Signed-off-by: Nicolas Capens
  Signed-off-by: Daniel Koch
  Author: Geoff Lang
  
  git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1589 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/libGLESv2/renderer/VertexBuffer.h

• //
  // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // VertexBuffer.h: Defines the abstract VertexBuffer class and VertexBufferInterface
  // class with derivations, classes that perform graphics API agnostic vertex buffer operations.
  
  #ifndef LIBGLESV2_RENDERER_VERTEXBUFFER_H_
  #define LIBGLESV2_RENDERER_VERTEXBUFFER_H_
  
  #include <vector>
  #include <cstddef>
  
  #define GL_APICALL
  #include <GLES2/gl2.h>
  
  #include "libGLESv2/Context.h"
  #include "libGLESv2/renderer/Renderer.h"
  
  namespace rx
  {
  
  class VertexBuffer
  {
    public:
      VertexBuffer();
      virtual ~VertexBuffer();
  
      virtual bool initialize(unsigned int size, bool dynamicUsage) = 0;
  
      virtual bool storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count,
                                         GLsizei instances, unsigned int offset) = 0;
      virtual bool storeRawData(const void* data, unsigned int size, unsigned int offset) = 0;
  
      virtual unsigned int getSpaceRequired(const gl::VertexAttribute &attrib, GLsizei count,
                                            GLsizei instances) const = 0;
  
      virtual unsigned int getBufferSize() const = 0;
      virtual bool setBufferSize(unsigned int size) = 0;
      virtual bool discard() = 0;
  
      unsigned int getSerial() const;
  
    protected:
      void updateSerial();
  
    private:
      DISALLOW_COPY_AND_ASSIGN(VertexBuffer);
  
      unsigned int mSerial;
      static unsigned int mNextSerial;
  };
  
  class VertexBufferInterface
  {
    public:
      VertexBufferInterface(rx::Renderer *renderer, bool dynamic);
      virtual ~VertexBufferInterface();
  
      void reserveVertexSpace(const gl::VertexAttribute &attribute, GLsizei count, GLsizei instances);
      void reserveRawDataSpace(unsigned int size);
  
      unsigned int getBufferSize() const;
  
      unsigned int getSerial() const;
  
      virtual int storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count, GLsizei instances);
      virtual int storeRawData(const void* data, unsigned int size);
  
      VertexBuffer* getVertexBuffer() const;
  
    protected:
      virtual bool reserveSpace(unsigned int size) = 0;
  
      unsigned int getWritePosition() const;
      void setWritePosition(unsigned int writePosition);
  
      bool discard();
  
      bool setBufferSize(unsigned int size);
  
    private:
      DISALLOW_COPY_AND_ASSIGN(VertexBufferInterface);
  
      rx::Renderer *const mRenderer;
  
      VertexBuffer* mVertexBuffer;
  
      unsigned int mWritePosition;
      unsigned int mReservedSpace;
      bool mDynamic;
  };
  
  class StreamingVertexBufferInterface : public VertexBufferInterface
  {
    public:
      StreamingVertexBufferInterface(rx::Renderer *renderer, std::size_t initialSize);
      ~StreamingVertexBufferInterface();
  
    protected:
      bool reserveSpace(unsigned int size);
  };
  
  class StaticVertexBufferInterface : public VertexBufferInterface
  {
    public:
      explicit StaticVertexBufferInterface(rx::Renderer *renderer);
      ~StaticVertexBufferInterface();
  
      int storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count, GLsizei instances);
  
      // Returns the offset into the vertex buffer, or -1 if not found
      int lookupAttribute(const gl::VertexAttribute &attribute);
  
    protected:
      bool reserveSpace(unsigned int size);
  
    private:
      struct VertexElement
      {
          GLenum type;
          GLint size;
          GLsizei stride;
          bool normalized;
          int attributeOffset;
  
          unsigned int streamOffset;
      };
  
      std::vector<VertexElement> mCache;
  };
  
  }
  
  #endif // LIBGLESV2_RENDERER_VERTEXBUFFER_H_

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