Home | History | Annotate | Download | only in canvas 
      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/WebGLRenderingContext.h"
     30 #include "wtf/RefCounted.h"
     31 
     32 namespace WebCore {
     33 
     34 class WebGLExtension : public RefCounted<WebGLExtension> {
     35     WTF_MAKE_FAST_ALLOCATED;
     36 public:
     37     // Extension names are needed to properly wrap instances in JavaScript objects.
     38     enum ExtensionName {
     39         ANGLEInstancedArraysName,
     40         EXTFragDepthName,
     41         EXTTextureFilterAnisotropicName,
     42         OESElementIndexUintName,
     43         OESStandardDerivativesName,
     44         OESTextureFloatLinearName,
     45         OESTextureFloatName,
     46         OESTextureHalfFloatLinearName,
     47         OESTextureHalfFloatName,
     48         OESVertexArrayObjectName,
     49         WebGLCompressedTextureATCName,
     50         WebGLCompressedTexturePVRTCName,
     51         WebGLCompressedTextureS3TCName,
     52         WebGLDebugRendererInfoName,
     53         WebGLDebugShadersName,
     54         WebGLDepthTextureName,
     55         WebGLDrawBuffersName,
     56         WebGLLoseContextName,
     57     };
     58 
     59     WebGLRenderingContext* context() { return m_context; }
     60 
     61     virtual ~WebGLExtension();
     62     virtual ExtensionName getName() const = 0;
     63 
     64     // Lose this extension. Passing true = force loss. Some extensions
     65     // like WEBGL_lose_context are not normally lost when the context
     66     // is lost but must be lost when destroying their WebGLRenderingContext.
     67     virtual void lose(bool)
     68     {
     69         m_context = 0;
     70     }
     71 
     72     bool isLost()
     73     {
     74         return !m_context;
     75     }
     76 
     77 protected:
     78     WebGLExtension(WebGLRenderingContext*);
     79 
     80     WebGLRenderingContext* m_context;
     81 };
     82 
     83 } // namespace WebCore
     84 
     85 #endif // WebGLExtension_h
     86