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//
// Copyright (c) 2002-2010 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.
//
// geometry/backend.h: Abstract classes BufferBackEnd, TranslatedVertexBuffer and TranslatedIndexBuffer
// that must be implemented by any API-specific implementation of ANGLE.
#ifndef LIBGLESV2_GEOMETRY_BACKEND_H_
#define LIBGLESV2_GEOMETRY_BACKEND_H_
#include <cstddef>
#define GL_APICALL
#include <GLES2/gl2.h>
#include "libGLESv2/Context.h"
namespace gl
{
class TranslatedVertexBuffer;
class TranslatedIndexBuffer;
struct FormatConverter
{
bool identity;
std::size_t outputVertexSize;
void (*convertArray)(const void *in, std::size_t stride, std::size_t n, void *out);
};
struct TranslatedAttribute
{
bool enabled;
bool nonArray;
// These are the original untranslated values. (Or just have some sort of BufferBackEnd::TranslatedTypeKey.)
GLenum type;
std::size_t size;
bool normalized;
std::size_t offset;
std::size_t stride; // 0 means not to advance the read pointer at all
std::size_t semanticIndex;
TranslatedVertexBuffer *buffer;
};
class BufferBackEnd
{
public:
virtual ~BufferBackEnd() { }
virtual bool supportIntIndices() = 0;
virtual TranslatedVertexBuffer *createVertexBuffer(std::size_t size) = 0;
virtual TranslatedVertexBuffer *createVertexBufferForStrideZero(std::size_t size) = 0;
virtual TranslatedIndexBuffer *createIndexBuffer(std::size_t size, GLenum type) = 0;
virtual FormatConverter getFormatConverter(GLenum type, std::size_t size, bool normalize) = 0;
// For an identity-mappable stream, verify that the stride and offset are okay.
virtual bool validateStream(GLenum type, std::size_t size, std::size_t stride, std::size_t offset) const = 0;
virtual GLenum setupIndicesPreDraw(const TranslatedIndexData &indexInfo) = 0;
virtual GLenum setupAttributesPreDraw(const TranslatedAttribute *attributes) = 0;
};
class TranslatedBuffer
{
public:
explicit TranslatedBuffer(std::size_t size) : mBufferSize(size), mCurrentPoint(0) { }
virtual ~TranslatedBuffer() { }
std::size_t size() const { return mBufferSize; }
virtual void *map() = 0;
virtual void unmap() = 0;
void reserveSpace(std::size_t requiredSpace);
void *map(std::size_t requiredSpace, std::size_t *offset);
protected:
virtual void recycle() = 0;
virtual void *streamingMap(std::size_t offset, std::size_t size) = 0;
private:
std::size_t mBufferSize;
std::size_t mCurrentPoint;
DISALLOW_COPY_AND_ASSIGN(TranslatedBuffer);
};
class TranslatedVertexBuffer : public TranslatedBuffer
{
public:
explicit TranslatedVertexBuffer(std::size_t size) : TranslatedBuffer(size) { }
};
class TranslatedIndexBuffer : public TranslatedBuffer
{
public:
explicit TranslatedIndexBuffer(std::size_t size) : TranslatedBuffer(size) { }
};
}
#endif // LIBGLESV2_GEOMETRY_BACKEND_H_
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