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//
// 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 ¤tValue,
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 ¤tValue,
GLint start, GLsizei count, GLsizei instances, unsigned int *outStreamOffset);
bool directStoragePossible(const gl::VertexAttribute &attrib,
const gl::VertexAttribCurrentValueData ¤tValue) 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 ¤tValue,
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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