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      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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef Shader_h
     32 #define Shader_h
     33 
     34 #include <wtf/Noncopyable.h>
     35 #include <wtf/PassOwnPtr.h>
     36 #include <wtf/text/WTFString.h>
     37 
     38 namespace WebCore {
     39 
     40 class AffineTransform;
     41 class GraphicsContext3D;
     42 class Color;
     43 
     44 class Shader {
     45     WTF_MAKE_NONCOPYABLE(Shader);
     46 public:
     47     enum VertexType {
     48         TwoDimensional,
     49         LoopBlinnInterior,
     50         LoopBlinnExterior
     51     };
     52 
     53     enum FillType {
     54         SolidFill,
     55         TextureFill
     56     };
     57 
     58     // Currently only applies to the Loop-Blinn vertex type.
     59     enum AntialiasType {
     60         NotAntialiased,
     61         Antialiased
     62     };
     63 
     64 protected:
     65     Shader(GraphicsContext3D*, unsigned program);
     66     ~Shader();
     67 
     68     static String generateVertex(VertexType, FillType);
     69     static String generateFragment(VertexType, FillType, AntialiasType);
     70 
     71     static void affineTo3x3(const AffineTransform&, float mat[9]);
     72     static void affineTo4x4(const AffineTransform&, float mat[16]);
     73     static unsigned loadShader(GraphicsContext3D*, unsigned type, const String& shaderSource);
     74     static unsigned loadProgram(GraphicsContext3D*, const String& vertexShaderSource, const String& fragmentShaderSource);
     75 
     76     GraphicsContext3D* m_context;
     77     unsigned m_program;
     78 };
     79 
     80 }
     81 
     82 #endif // Shader_h
     83