michael@0: //
michael@0: // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: // VertexBuffer.h: Defines the abstract VertexBuffer class and VertexBufferInterface
michael@0: // class with derivations, classes that perform graphics API agnostic vertex buffer operations.
michael@0: 
michael@0: #ifndef LIBGLESV2_RENDERER_VERTEXBUFFER_H_
michael@0: #define LIBGLESV2_RENDERER_VERTEXBUFFER_H_
michael@0: 
michael@0: #include "common/angleutils.h"
michael@0: 
michael@0: namespace gl
michael@0: {
michael@0: class VertexAttribute;
michael@0: }
michael@0: 
michael@0: namespace rx
michael@0: {
michael@0: class Renderer;
michael@0: 
michael@0: class VertexBuffer
michael@0: {
michael@0:   public:
michael@0:     VertexBuffer();
michael@0:     virtual ~VertexBuffer();
michael@0: 
michael@0:     virtual bool initialize(unsigned int size, bool dynamicUsage) = 0;
michael@0: 
michael@0:     virtual bool storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count,
michael@0:                                        GLsizei instances, unsigned int offset) = 0;
michael@0:     virtual bool storeRawData(const void* data, unsigned int size, unsigned int offset) = 0;
michael@0: 
michael@0:     virtual bool getSpaceRequired(const gl::VertexAttribute &attrib, GLsizei count, GLsizei instances,
michael@0:                                   unsigned int *outSpaceRequired) const = 0;
michael@0: 
michael@0:     virtual bool requiresConversion(const gl::VertexAttribute &attrib) const = 0;
michael@0: 
michael@0:     virtual unsigned int getBufferSize() const = 0;
michael@0:     virtual bool setBufferSize(unsigned int size) = 0;
michael@0:     virtual bool discard() = 0;
michael@0: 
michael@0:     unsigned int getSerial() const;
michael@0: 
michael@0:   protected:
michael@0:     void updateSerial();
michael@0: 
michael@0:   private:
michael@0:     DISALLOW_COPY_AND_ASSIGN(VertexBuffer);
michael@0: 
michael@0:     unsigned int mSerial;
michael@0:     static unsigned int mNextSerial;
michael@0: };
michael@0: 
michael@0: class VertexBufferInterface
michael@0: {
michael@0:   public:
michael@0:     VertexBufferInterface(rx::Renderer *renderer, bool dynamic);
michael@0:     virtual ~VertexBufferInterface();
michael@0: 
michael@0:     bool reserveVertexSpace(const gl::VertexAttribute &attribute, GLsizei count, GLsizei instances);
michael@0:     bool reserveRawDataSpace(unsigned int size);
michael@0: 
michael@0:     unsigned int getBufferSize() const;
michael@0: 
michael@0:     unsigned int getSerial() const;
michael@0: 
michael@0:     virtual bool storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count, GLsizei instances,
michael@0:                                       unsigned int *outStreamOffset);
michael@0:     virtual bool storeRawData(const void* data, unsigned int size, unsigned int *outStreamOffset);
michael@0: 
michael@0:     VertexBuffer* getVertexBuffer() const;
michael@0: 
michael@0:   protected:
michael@0:     virtual bool reserveSpace(unsigned int size) = 0;
michael@0: 
michael@0:     unsigned int getWritePosition() const;
michael@0:     void setWritePosition(unsigned int writePosition);
michael@0: 
michael@0:     bool discard();
michael@0: 
michael@0:     bool setBufferSize(unsigned int size);
michael@0: 
michael@0:   private:
michael@0:     DISALLOW_COPY_AND_ASSIGN(VertexBufferInterface);
michael@0: 
michael@0:     rx::Renderer *const mRenderer;
michael@0: 
michael@0:     VertexBuffer* mVertexBuffer;
michael@0: 
michael@0:     unsigned int mWritePosition;
michael@0:     unsigned int mReservedSpace;
michael@0:     bool mDynamic;
michael@0: };
michael@0: 
michael@0: class StreamingVertexBufferInterface : public VertexBufferInterface
michael@0: {
michael@0:   public:
michael@0:     StreamingVertexBufferInterface(rx::Renderer *renderer, std::size_t initialSize);
michael@0:     ~StreamingVertexBufferInterface();
michael@0: 
michael@0:   protected:
michael@0:     bool reserveSpace(unsigned int size);
michael@0: };
michael@0: 
michael@0: class StaticVertexBufferInterface : public VertexBufferInterface
michael@0: {
michael@0:   public:
michael@0:     explicit StaticVertexBufferInterface(rx::Renderer *renderer);
michael@0:     ~StaticVertexBufferInterface();
michael@0: 
michael@0:     bool storeVertexAttributes(const gl::VertexAttribute &attrib, GLint start, GLsizei count, GLsizei instances,
michael@0:                                unsigned int *outStreamOffset);
michael@0: 
michael@0:     bool lookupAttribute(const gl::VertexAttribute &attribute, unsigned int* outStreamOffset);
michael@0: 
michael@0:   protected:
michael@0:     bool reserveSpace(unsigned int size);
michael@0: 
michael@0:   private:
michael@0:     struct VertexElement
michael@0:     {
michael@0:         GLenum type;
michael@0:         GLint size;
michael@0:         GLsizei stride;
michael@0:         bool normalized;
michael@0:         int attributeOffset;
michael@0: 
michael@0:         unsigned int streamOffset;
michael@0:     };
michael@0: 
michael@0:     std::vector<VertexElement> mCache;
michael@0: };
michael@0: 
michael@0: }
michael@0: 
michael@0: #endif // LIBGLESV2_RENDERER_VERTEXBUFFER_H_