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/*
* Copyright (C) 2009-2017 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 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 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.
*/
#pragma once
#if ENABLE(WEBGL)
#include "WebGLSharedObject.h"
#include <wtf/RefPtr.h>
namespace JSC {
class ArrayBuffer;
class ArrayBufferView;
}
namespace WebCore {
class WebGLBuffer final : public WebGLSharedObject {
public:
static Ref<WebGLBuffer> create(WebGLRenderingContextBase&);
virtual ~WebGLBuffer();
bool associateBufferData(GCGLsizeiptr size);
bool associateBufferData(JSC::ArrayBuffer*);
bool associateBufferData(JSC::ArrayBufferView*);
bool associateBufferSubData(GCGLintptr offset, JSC::ArrayBuffer*);
bool associateBufferSubData(GCGLintptr offset, JSC::ArrayBufferView*);
bool associateCopyBufferSubData(const WebGLBuffer& readBuffer, GCGLintptr readOffset, GCGLintptr writeOffset, GCGLsizeiptr);
void disassociateBufferData();
GCGLsizeiptr byteLength() const;
const RefPtr<JSC::ArrayBuffer> elementArrayBuffer() const;
// Gets the cached max index for the given type if one has been set.
std::optional<unsigned> getCachedMaxIndex(GCGLenum type);
// Sets the cached max index for the given type.
void setCachedMaxIndex(GCGLenum type, unsigned value);
GCGLenum getTarget() const { return m_target; }
void setTarget(GCGLenum);
bool hasEverBeenBound() const { return object() && m_target; }
private:
WebGLBuffer(WebGLRenderingContextBase&);
void deleteObjectImpl(const AbstractLocker&, GraphicsContextGL*, PlatformGLObject) override;
GCGLenum m_target { 0 };
RefPtr<JSC::ArrayBuffer> m_elementArrayBuffer;
GCGLsizeiptr m_byteLength { 0 };
// 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 {
GCGLenum type;
unsigned maxIndex;
};
// OpenGL ES 2.0 only has two valid index types (UNSIGNED_BYTE
// and UNSIGNED_SHORT) plus one extension (UNSIGNED_INT).
MaxIndexCacheEntry m_maxIndexCache[4];
unsigned m_nextAvailableCacheEntry { 0 };
// Clears all of the cached max indices.
void clearCachedMaxIndices();
// Helper function called by the three associateBufferData().
bool associateBufferDataImpl(const void* data, GCGLsizeiptr byteLength);
// Helper function called by the two associateBufferSubData().
bool associateBufferSubDataImpl(GCGLintptr offset, const void* data, GCGLsizeiptr byteLength);
};
} // namespace WebCore
#endif