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/*
* Copyright (C) 2010 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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 "WebGLRenderingContextBase.h"
#include <wtf/ForbidHeapAllocation.h>
#include <wtf/Noncopyable.h>
#include <wtf/RefCounted.h>
#include <wtf/TypeCasts.h>
namespace WebCore {
class WebGLExtensionScopedContext final {
WTF_FORBID_HEAP_ALLOCATION;
WTF_MAKE_NONCOPYABLE(WebGLExtensionScopedContext);
public:
explicit WebGLExtensionScopedContext(WebGLExtension*);
template<typename T>
constexpr T* downcast() const { return WTF::downcast<T>(m_context); }
constexpr bool isLost() const { return !m_context; }
constexpr WebGLRenderingContextBase& operator*() const { ASSERT(!isLost()); return *m_context; }
constexpr WebGLRenderingContextBase* operator->() const { ASSERT(!isLost()); return m_context; }
private:
WebGLRenderingContextBase* m_context;
};
class WebGLExtension : public RefCounted<WebGLExtension> {
WTF_MAKE_ISO_ALLOCATED(WebGLExtension);
public:
// Extension names are needed to properly wrap instances in JavaScript objects.
enum ExtensionName {
ANGLEInstancedArraysName,
EXTBlendMinMaxName,
EXTColorBufferFloatName,
EXTColorBufferHalfFloatName,
EXTFloatBlendName,
EXTFragDepthName,
EXTShaderTextureLODName,
EXTTextureCompressionBPTCName,
EXTTextureCompressionRGTCName,
EXTTextureFilterAnisotropicName,
EXTTextureNorm16Name,
EXTsRGBName,
KHRParallelShaderCompileName,
OESDrawBuffersIndexedName,
OESElementIndexUintName,
OESFBORenderMipmapName,
OESStandardDerivativesName,
OESTextureFloatName,
OESTextureFloatLinearName,
OESTextureHalfFloatName,
OESTextureHalfFloatLinearName,
OESVertexArrayObjectName,
WebGLColorBufferFloatName,
WebGLCompressedTextureASTCName,
WebGLCompressedTextureATCName,
WebGLCompressedTextureETCName,
WebGLCompressedTextureETC1Name,
WebGLCompressedTexturePVRTCName,
WebGLCompressedTextureS3TCName,
WebGLCompressedTextureS3TCsRGBName,
WebGLDebugRendererInfoName,
WebGLDebugShadersName,
WebGLDepthTextureName,
WebGLDrawBuffersName,
WebGLDrawInstancedBaseVertexBaseInstanceName,
WebGLLoseContextName,
WebGLMultiDrawName,
WebGLMultiDrawInstancedBaseVertexBaseInstanceName,
};
WebGLRenderingContextBase* context() { return m_context; }
virtual ~WebGLExtension();
virtual ExtensionName getName() const = 0;
// Lose the parent WebGL context. The context loss mode changes
// the behavior specifically of WEBGL_lose_context, which does not
// lose its connection to its parent context when it forces a
// context loss. However, all extensions must be lost when
// destroying their WebGLRenderingContextBase.
virtual void loseParentContext(WebGLRenderingContextBase::LostContextMode);
bool isLostContext() { return !m_context; }
protected:
WebGLExtension(WebGLRenderingContextBase&);
private:
WebGLRenderingContextBase* m_context;
};
} // namespace WebCore
#endif
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