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      1 /*
      2  * Copyright (C) 2012 Adobe Systems Incorporated. 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
      9  *    copyright notice, this list of conditions and the following
     10  *    disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above
     12  *    copyright notice, this list of conditions and the following
     13  *    disclaimer in the documentation and/or other materials
     14  *    provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AS IS AND ANY
     17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
     20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     21  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     25  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #ifndef CustomFilterGlobalContext_h
     31 #define CustomFilterGlobalContext_h
     32 
     33 #include "platform/graphics/angle/ANGLEPlatformBridge.h"
     34 #include "platform/graphics/filters/custom/CustomFilterProgramInfo.h"
     35 #include "wtf/HashMap.h"
     36 #include "wtf/Noncopyable.h"
     37 #include "wtf/RefPtr.h"
     38 
     39 namespace WebCore {
     40 
     41 class CustomFilterValidatedProgram;
     42 class GraphicsContext3D;
     43 
     44 typedef HashMap<CustomFilterProgramInfo, CustomFilterValidatedProgram*> CustomFilterValidatedProgramsMap;
     45 
     46 class PLATFORM_EXPORT CustomFilterGlobalContext {
     47     WTF_MAKE_NONCOPYABLE(CustomFilterGlobalContext);
     48 public:
     49     CustomFilterGlobalContext();
     50     ~CustomFilterGlobalContext();
     51 
     52     GraphicsContext3D* context() const { return m_context.get(); }
     53 
     54     // CSS shaders not referenced from the CSS mix function should be validated just like regular WebGL shaders.
     55     // This ANGLE validator uses the SH_WEBGL_SPEC flag.
     56     ANGLEPlatformBridge* webglShaderValidator();
     57 
     58     // CSS shaders referenced from the CSS mix function should be validated slightly differently than WebGL shaders.
     59     // This ANGLE validator uses the SH_CSS_SHADERS_SPEC flag.
     60     // Under this flag, most notably:
     61     // - The "gl_FragColor" built-in is not available.
     62     // - Instead, the "css_MixColor" and "css_ColorMatrix" built-ins are available.
     63     // - The "css_" prefix is reserved.
     64     // - In the translated source that ANGLE returns, ANGLE renames the author's "main" function to "css_main".
     65     // The complete details are documented in ANGLE/ShaderLang.h.
     66     ANGLEPlatformBridge* mixShaderValidator();
     67 
     68     void prepareContextIfNeeded();
     69 
     70     PassRefPtr<CustomFilterValidatedProgram> getValidatedProgram(const CustomFilterProgramInfo&);
     71     void removeValidatedProgram(const CustomFilterValidatedProgram*);
     72 private:
     73     static PassOwnPtr<ANGLEPlatformBridge> createShaderValidator(ShShaderSpec);
     74 
     75     RefPtr<GraphicsContext3D> m_context;
     76     OwnPtr<ANGLEPlatformBridge> m_webglShaderValidator;
     77     OwnPtr<ANGLEPlatformBridge> m_mixShaderValidator;
     78     CustomFilterValidatedProgramsMap m_programs;
     79 };
     80 
     81 } // namespace WebCore
     82 
     83 #endif // CustomFilterGlobalContext_h
     84