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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 "core/platform/graphics/ANGLEWebKitBridge.h"
     34 #include "core/platform/graphics/filters/custom/CustomFilterProgramInfo.h"
     35 #include "wtf/HashMap.h"
     36 #include "wtf/RefPtr.h"
     37 
     38 namespace WebCore {
     39 
     40 class CustomFilterValidatedProgram;
     41 class GraphicsContext3D;
     42 
     43 typedef HashMap<CustomFilterProgramInfo, CustomFilterValidatedProgram*> CustomFilterValidatedProgramsMap;
     44 
     45 class CustomFilterGlobalContext {
     46 public:
     47     CustomFilterGlobalContext();
     48     ~CustomFilterGlobalContext();
     49 
     50     GraphicsContext3D* context() const { return m_context.get(); }
     51 
     52     // CSS shaders not referenced from the CSS mix function should be validated just like regular WebGL shaders.
     53     // This ANGLE validator uses the SH_WEBGL_SPEC flag.
     54     ANGLEWebKitBridge* webglShaderValidator();
     55 
     56     // CSS shaders referenced from the CSS mix function should be validated slightly differently than WebGL shaders.
     57     // This ANGLE validator uses the SH_CSS_SHADERS_SPEC flag.
     58     // Under this flag, most notably:
     59     // - The "gl_FragColor" built-in is not available.
     60     // - Instead, the "css_MixColor" and "css_ColorMatrix" built-ins are available.
     61     // - The "css_" prefix is reserved.
     62     // - In the translated source that ANGLE returns, ANGLE renames the author's "main" function to "css_main".
     63     // The complete details are documented in ANGLE/ShaderLang.h.
     64     ANGLEWebKitBridge* mixShaderValidator();
     65 
     66     void prepareContextIfNeeded();
     67 
     68     PassRefPtr<CustomFilterValidatedProgram> getValidatedProgram(const CustomFilterProgramInfo&);
     69     void removeValidatedProgram(const CustomFilterValidatedProgram*);
     70 private:
     71     static PassOwnPtr<ANGLEWebKitBridge> createShaderValidator(ShShaderSpec);
     72 
     73     RefPtr<GraphicsContext3D> m_context;
     74     OwnPtr<ANGLEWebKitBridge> m_webglShaderValidator;
     75     OwnPtr<ANGLEWebKitBridge> m_mixShaderValidator;
     76     CustomFilterValidatedProgramsMap m_programs;
     77 };
     78 
     79 } // namespace WebCore
     80 
     81 #endif // CustomFilterGlobalContext_h
     82