text: /*
   * Copyright (C) 2009 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef WebGLProgram_h
  #define WebGLProgram_h
  
  #include "bindings/core/v8/ScriptWrappable.h"
  #include "core/html/canvas/WebGLSharedObject.h"
  #include "core/html/canvas/WebGLShader.h"
  #include "wtf/PassRefPtr.h"
  #include "wtf/Vector.h"
  
  namespace blink {
  
  class WebGLProgram FINAL : public WebGLSharedObject, public ScriptWrappable {
      DEFINE_WRAPPERTYPEINFO();
  public:
      virtual ~WebGLProgram();
  
      static PassRefPtrWillBeRawPtr<WebGLProgram> create(WebGLRenderingContextBase*);
  
      unsigned numActiveAttribLocations();
      GLint getActiveAttribLocation(GLuint index);
  
      bool isUsingVertexAttrib0();
  
      bool linkStatus();
  
      unsigned linkCount() const { return m_linkCount; }
  
      // This is to be called everytime after the program is successfully linked.
      // We don't deal with integer overflow here, assuming in reality a program
      // will never be linked so many times.
      // Also, we invalidate the cached program info.
      void increaseLinkCount();
  
      WebGLShader* getAttachedShader(GLenum);
      bool attachShader(WebGLShader*);
      bool detachShader(WebGLShader*);
  
      virtual void trace(Visitor*) OVERRIDE;
  
  protected:
      explicit WebGLProgram(WebGLRenderingContextBase*);
  
      virtual void deleteObjectImpl(blink::WebGraphicsContext3D*, Platform3DObject) OVERRIDE;
  
  private:
      virtual bool isProgram() const OVERRIDE { return true; }
  
      void cacheActiveAttribLocations(blink::WebGraphicsContext3D*);
      void cacheInfoIfNeeded();
  
      Vector<GLint> m_activeAttribLocations;
  
      GLint m_linkStatus;
  
      // This is used to track whether a WebGLUniformLocation belongs to this
      // program or not.
      unsigned m_linkCount;
  
      RefPtrWillBeMember<WebGLShader> m_vertexShader;
      RefPtrWillBeMember<WebGLShader> m_fragmentShader;
  
      bool m_infoValid;
  };
  
  } // namespace blink
  
  #endif // WebGLProgram_h
  