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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 <atomic>
#include <wtf/RefCounted.h>
namespace WebCore {
class WebCoreOpaqueRoot;
// Manual variant discriminator for any WebGL extension. Used for downcasting the WebGLExtensionBase pointers
// to the concrete type.
enum class WebGLExtensionName {
ANGLEInstancedArrays,
EXTBlendMinMax,
EXTClipControl,
EXTColorBufferFloat,
EXTColorBufferHalfFloat,
EXTConservativeDepth,
EXTDepthClamp,
EXTDisjointTimerQuery,
EXTDisjointTimerQueryWebGL2,
EXTFloatBlend,
EXTFragDepth,
EXTPolygonOffsetClamp,
EXTRenderSnorm,
EXTShaderTextureLOD,
EXTTextureCompressionBPTC,
EXTTextureCompressionRGTC,
EXTTextureFilterAnisotropic,
EXTTextureMirrorClampToEdge,
EXTTextureNorm16,
EXTsRGB,
KHRParallelShaderCompile,
NVShaderNoperspectiveInterpolation,
OESDrawBuffersIndexed,
OESElementIndexUint,
OESFBORenderMipmap,
OESSampleVariables,
OESShaderMultisampleInterpolation,
OESStandardDerivatives,
OESTextureFloat,
OESTextureFloatLinear,
OESTextureHalfFloat,
OESTextureHalfFloatLinear,
OESVertexArrayObject,
WebGLBlendFuncExtended,
WebGLClipCullDistance,
WebGLColorBufferFloat,
WebGLCompressedTextureASTC,
WebGLCompressedTextureETC,
WebGLCompressedTextureETC1,
WebGLCompressedTexturePVRTC,
WebGLCompressedTextureS3TC,
WebGLCompressedTextureS3TCsRGB,
WebGLDebugRendererInfo,
WebGLDebugShaders,
WebGLDepthTexture,
WebGLDrawBuffers,
WebGLDrawInstancedBaseVertexBaseInstance,
WebGLLoseContext,
WebGLMultiDraw,
WebGLMultiDrawInstancedBaseVertexBaseInstance,
WebGLPolygonMode,
WebGLProvokingVertex,
WebGLRenderSharedExponent,
WebGLStencilTexturing
};
class WebGLExtensionBase : public RefCounted<WebGLExtensionBase> {
public:
WebGLExtensionName name() const { return m_name; }
virtual ~WebGLExtensionBase() = default;
protected:
WebGLExtensionBase(WebGLExtensionName name)
: m_name(name)
{
}
protected:
const WebGLExtensionName m_name;
};
// Mixin class for WebGL extension implementations.
// All functions should start with preamble:
// if (isContextLost())
// return;
// auto& context = this->context();
// context.drawSomething(...);
template<typename T>
class WebGLExtension : public WebGLExtensionBase {
public:
void loseParentContext() { m_context = nullptr; }
T& context() { ASSERT(!isContextLost()); return *m_context.load(std::memory_order::relaxed); }
// Only to be used by friend WebCoreOpaqueRoot root(const WebGLExtension<T>*) that cannot be a friend
// due to C++ warning on some compilers.
T* opaqueRoot() const { return m_context.load(); }
protected:
WebGLExtension(T& context, WebGLExtensionName name)
: WebGLExtensionBase(name)
, m_context(&context)
{
}
bool isContextLost() const { return !m_context.load(std::memory_order::relaxed); }
private:
std::atomic<T*> m_context;
};
} // namespace WebCore
#endif
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