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      1 /*
      2  * Copyright (C) 2009 Apple 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  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef WebGLProgram_h
     27 #define WebGLProgram_h
     28 
     29 #include "bindings/v8/ScriptWrappable.h"
     30 #include "core/html/canvas/WebGLSharedObject.h"
     31 #include "core/html/canvas/WebGLShader.h"
     32 #include "wtf/PassRefPtr.h"
     33 #include "wtf/Vector.h"
     34 
     35 namespace WebCore {
     36 
     37 class WebGLProgram : public WebGLSharedObject, public ScriptWrappable {
     38 public:
     39     virtual ~WebGLProgram();
     40 
     41     static PassRefPtr<WebGLProgram> create(WebGLRenderingContext*);
     42 
     43     unsigned numActiveAttribLocations();
     44     GC3Dint getActiveAttribLocation(GC3Duint index);
     45 
     46     bool isUsingVertexAttrib0();
     47 
     48     bool linkStatus();
     49     void setLinkStatus(bool);
     50 
     51     unsigned linkCount() const { return m_linkCount; }
     52 
     53     // This is to be called everytime after the program is successfully linked.
     54     // We don't deal with integer overflow here, assuming in reality a program
     55     // will never be linked so many times.
     56     // Also, we invalidate the cached program info.
     57     void increaseLinkCount();
     58 
     59     WebGLShader* getAttachedShader(GC3Denum);
     60     bool attachShader(WebGLShader*);
     61     bool detachShader(WebGLShader*);
     62 
     63 protected:
     64     WebGLProgram(WebGLRenderingContext*);
     65 
     66     virtual void deleteObjectImpl(GraphicsContext3D*, Platform3DObject);
     67 
     68 private:
     69     virtual bool isProgram() const { return true; }
     70 
     71     void cacheActiveAttribLocations(GraphicsContext3D*);
     72     void cacheInfoIfNeeded();
     73 
     74     Vector<GC3Dint> m_activeAttribLocations;
     75 
     76     GC3Dint m_linkStatus;
     77 
     78     // This is used to track whether a WebGLUniformLocation belongs to this
     79     // program or not.
     80     unsigned m_linkCount;
     81 
     82     RefPtr<WebGLShader> m_vertexShader;
     83     RefPtr<WebGLShader> m_fragmentShader;
     84 
     85     bool m_infoValid;
     86 };
     87 
     88 } // namespace WebCore
     89 
     90 #endif // WebGLProgram_h
     91