Implement WEBGL_shared_resources

Source/core/html/canvas/WebGLProgram.h

 /*
  * 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
@@ skipping 11 matching lines @@
  * (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/v8/ScriptWrappable.h"
 #include "core/html/canvas/WebGLSharedObject.h"
 #include "core/html/canvas/WebGLShader.h"
+#include "wtf/HashMap.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class WebGLProgram : public WebGLSharedObject, public ScriptWrappable {
 public:
+    struct SamplerInfo {
+        SamplerInfo(GC3Denum type, GC3Dint nextLocation)
+            : type(type)
+            , unit(0)
+            , nextLocation(nextLocation)
+        {
+        }
+        SamplerInfo()
+            : type(0)
+            , unit(-1)
+            , nextLocation(-1)
+        {
+        }
+        GC3Denum type;
+        GC3Dint unit;
+        GC3Dint nextLocation;
+    };
+    typedef HashMap<GC3Dint, SamplerInfo> SamplerTextureUnitMap;
+
     virtual ~WebGLProgram();
 
     static PassRefPtr<WebGLProgram> create(WebGLRenderingContext*);
 
-    unsigned numActiveAttribLocations();
-    GC3Dint getActiveAttribLocation(GC3Duint index);
+    unsigned numActiveAttribLocations(WebGLRenderingContext*);
+    GC3Dint getActiveAttribLocation(WebGLRenderingContext*, GC3Duint index);
 
-    bool isUsingVertexAttrib0();
+    bool isUsingVertexAttrib0(WebGLRenderingContext*);
 
-    bool getLinkStatus();
-    void setLinkStatus(bool);
+    bool getLinkStatus(WebGLRenderingContext*);
+    void setLinkStatus(WebGLRenderingContext*, bool);
 
     unsigned getLinkCount() 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(GC3Denum);
     bool attachShader(WebGLShader*);
     bool detachShader(WebGLShader*);
 
+    void setSampler(WebGLRenderingContext*, GC3Dint, GC3Dsizei, const GC3Dint*);

[Ken Russell (switch to Gerrit), 2013/06/19 03:51:24]

Would a more descriptive name like "conditionallySetSamplersToTextureUnits" be
useful here?

[greggman, 2013/06/21 19:54:21]

Done.

+    const SamplerTextureUnitMap& samplerLocationTextureUnitMap() const
+    {
+        return m_samplerLocationToTextureUnit;
+    }
+
 protected:
     WebGLProgram(WebGLRenderingContext*);
 
     virtual void deleteObjectImpl(GraphicsContext3D*, Platform3DObject);
 
 private:
     virtual bool isProgram() const { return true; }
+    virtual const char* typeName() const { return "WebGLProgram"; }
 
     void cacheActiveAttribLocations(GraphicsContext3D*);
-    void cacheInfoIfNeeded();
+    void cacheSamplerLocations(GraphicsContext3D*);
+    void cacheInfoIfNeeded(WebGLRenderingContext*);
 
     Vector<GC3Dint> m_activeAttribLocations;
+    SamplerTextureUnitMap m_samplerLocationToTextureUnit;
 
     GC3Dint m_linkStatus;
 
     // This is used to track whether a WebGLUniformLocation belongs to this
     // program or not.
     unsigned m_linkCount;
 
     RefPtr<WebGLShader> m_vertexShader;
     RefPtr<WebGLShader> m_fragmentShader;
 
     bool m_infoValid;
 };
 
 } // namespace WebCore
 
 #endif // WebGLProgram_h