1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef WebGLExtension_h 27 #define WebGLExtension_h 28 29 #include "core/html/canvas/WebGLExtensionName.h" 30 #include "core/html/canvas/WebGLRenderingContextBase.h" 31 #include "platform/heap/Handle.h" 32 #include "wtf/RefCounted.h" 33 34 namespace blink { 35 36 class WebGLExtension : public RefCountedWillBeGarbageCollectedFinalized<WebGLExtension> { 37 WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED; 38 public: 39 WebGLRenderingContextBase* context() { return m_context; } 40 41 virtual ~WebGLExtension(); 42 virtual WebGLExtensionName name() const = 0; 43 44 // Lose this extension. Passing true = force loss. Some extensions 45 // like WEBGL_lose_context are not normally lost when the context 46 // is lost but must be lost when destroying their WebGLRenderingContextBase. 47 virtual void lose(bool) 48 { 49 m_context = nullptr; 50 } 51 52 bool isLost() 53 { 54 return !m_context; 55 } 56 57 virtual void trace(Visitor*); 58 59 protected: 60 explicit WebGLExtension(WebGLRenderingContextBase*); 61 62 RawPtrWillBeWeakMember<WebGLRenderingContextBase> m_context; 63 }; 64 65 } // namespace blink 66 67 #endif // WebGLExtension_h 68
