Implement WEBGL_shared_resources

Source/core/html/canvas/WebGLProgram.h

Index: Source/core/html/canvas/WebGLProgram.h
diff --git a/Source/core/html/canvas/WebGLProgram.h b/Source/core/html/canvas/WebGLProgram.h
index 7356cac4ece6703167d07c58174371ac118ab636..dc94eeeb543c4012481ab1b611140f4bb294149c 100644
--- a/Source/core/html/canvas/WebGLProgram.h
+++ b/Source/core/html/canvas/WebGLProgram.h
@@ -29,6 +29,7 @@
 #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"
@@ -37,17 +38,36 @@ 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; }
 
@@ -61,6 +81,12 @@ public:
     bool attachShader(WebGLShader*);
     bool detachShader(WebGLShader*);
 
+    void conditionallyRecordTextureUnitsAssignedToSamplers(WebGLRenderingContext*, GC3Dint, GC3Dsizei, const GC3Dint*);
+    const SamplerTextureUnitMap& samplerLocationTextureUnitMap() const
+    {
+        return m_samplerLocationToTextureUnit;
+    }
+
 protected:
     WebGLProgram(WebGLRenderingContext*);
 
@@ -68,12 +94,20 @@ protected:
 
 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;
 
+    // This is a map of every uniform location that corresponds to a uniform sampler to some information
+    // about that uniform including the type of uniform and what value it's set to (what texture unit it
+    // is referring to. If the uniform is an element of an array it's nextLocation field is the location of
+    // the next element of the array.
+    SamplerTextureUnitMap m_samplerLocationToTextureUnit;
+
     GC3Dint m_linkStatus;
 
     // This is used to track whether a WebGLUniformLocation belongs to this