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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WebGLBuffer_h
#define WebGLBuffer_h
#include "ArrayBuffer.h"
#include "WebGLObject.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebCore {
class ArrayBufferView;
class WebGLBuffer : public WebGLObject {
public:
virtual ~WebGLBuffer() { deleteObject(); }
static PassRefPtr<WebGLBuffer> create(WebGLRenderingContext*);
bool associateBufferData(int size);
bool associateBufferData(ArrayBuffer* array);
bool associateBufferData(ArrayBufferView* array);
bool associateBufferSubData(long offset, ArrayBuffer* array);
bool associateBufferSubData(long offset, ArrayBufferView* array);
unsigned byteLength() const;
const ArrayBuffer* elementArrayBuffer() const { return m_elementArrayBuffer.get(); }
// Gets the cached max index for the given type. Returns -1 if
// none has been set.
long getCachedMaxIndex(unsigned long type);
// Sets the cached max index for the given type.
void setCachedMaxIndex(unsigned long type, long value);
unsigned long getTarget() const { return m_target; }
void setTarget(unsigned long);
protected:
WebGLBuffer(WebGLRenderingContext*);
virtual void deleteObjectImpl(Platform3DObject o);
private:
virtual bool isBuffer() const { return true; }
unsigned long m_target;
RefPtr<ArrayBuffer> m_elementArrayBuffer;
unsigned m_byteLength;
// Optimization for index validation. For each type of index
// (i.e., UNSIGNED_SHORT), cache the maximum index in the
// entire buffer.
//
// This is sufficient to eliminate a lot of work upon each
// draw call as long as all bound array buffers are at least
// that size.
struct MaxIndexCacheEntry {
unsigned long type;
long maxIndex;
};
// OpenGL ES 2.0 only has two valid index types (UNSIGNED_BYTE
// and UNSIGNED_SHORT), but might as well leave open the
// possibility of adding others.
MaxIndexCacheEntry m_maxIndexCache[4];
unsigned m_nextAvailableCacheEntry;
// Clears all of the cached max indices.
void clearCachedMaxIndices();
// Helper function called by the three associateBufferData().
bool associateBufferDataImpl(ArrayBuffer* array, unsigned byteOffset, unsigned byteLength);
// Helper function called by the two associateBufferSubData().
bool associateBufferSubDataImpl(long offset, ArrayBuffer* array, unsigned arrayByteOffset, unsigned byteLength);
};
} // namespace WebCore
#endif // WebGLBuffer_h
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