kc3-lang/angle/src/libGLESv2/renderer/d3d/VertexBuffer.h

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• Hash : f7100b98
  Author :
  Date : 2014-09-08T16:17:08
  

  Updated the vertex buffer classes to use Error objects.
  
  BUG=angle:520
  
  Change-Id: Id003e66b2acbf37dbbe66aaca2fa336c3c884be2
  Reviewed-on: https://chromium-review.googlesource.com/217102
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Tested-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libGLESv2/renderer/d3d/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 "common/angleutils.h"
  #include "libGLESv2/Error.h"
  
  #include <GLES2/gl2.h>
  
  #include <cstddef>
  #include <vector>
  
  namespace gl
  {
  struct VertexAttribute;
  struct VertexAttribCurrentValueData;
  }
  
  namespace rx
  {
  class Renderer;
  
  class VertexBuffer
  {
    public:
      VertexBuffer();
      virtual ~VertexBuffer();
  
      virtual gl::Error initialize(unsigned int size, bool dynamicUsage) = 0;
  
      virtual gl::Error storeVertexAttributes(const gl::VertexAttribute &attrib, const gl::VertexAttribCurrentValueData &currentValue,
                                              GLint start, GLsizei count, GLsizei instances, unsigned int offset) = 0;
      virtual gl::Error getSpaceRequired(const gl::VertexAttribute &attrib, GLsizei count, GLsizei instances,
                                         unsigned int *outSpaceRequired) const = 0;
  
      virtual unsigned int getBufferSize() const = 0;
      virtual gl::Error setBufferSize(unsigned int size) = 0;
      virtual gl::Error 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();
  
      gl::Error reserveVertexSpace(const gl::VertexAttribute &attribute, GLsizei count, GLsizei instances);
  
      unsigned int getBufferSize() const;
  
      unsigned int getSerial() const;
  
      virtual gl::Error storeVertexAttributes(const gl::VertexAttribute &attrib, const gl::VertexAttribCurrentValueData &currentValue,
                                              GLint start, GLsizei count, GLsizei instances, unsigned int *outStreamOffset);
  
      bool directStoragePossible(const gl::VertexAttribute &attrib,
                                 const gl::VertexAttribCurrentValueData &currentValue) const;
  
      VertexBuffer* getVertexBuffer() const;
  
    protected:
      virtual gl::Error reserveSpace(unsigned int size) = 0;
  
      unsigned int getWritePosition() const;
      void setWritePosition(unsigned int writePosition);
  
      gl::Error discard();
  
      gl::Error 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:
      gl::Error reserveSpace(unsigned int size);
  };
  
  class StaticVertexBufferInterface : public VertexBufferInterface
  {
    public:
      explicit StaticVertexBufferInterface(rx::Renderer *renderer);
      ~StaticVertexBufferInterface();
  
      gl::Error storeVertexAttributes(const gl::VertexAttribute &attrib, const gl::VertexAttribCurrentValueData &currentValue,
                                      GLint start, GLsizei count, GLsizei instances, unsigned int *outStreamOffset);
  
      bool lookupAttribute(const gl::VertexAttribute &attribute, unsigned int* outStreamFffset);
  
    protected:
      gl::Error reserveSpace(unsigned int size);
  
    private:
      struct VertexElement
      {
          GLenum type;
          GLuint size;
          GLuint stride;
          bool normalized;
          bool pureInteger;
          size_t attributeOffset;
  
          unsigned int streamOffset;
      };
  
      std::vector<VertexElement> mCache;
  };
  
  }
  
  #endif // LIBGLESV2_RENDERER_VERTEXBUFFER_H_

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