Add GrEllipseEdgeEffect

include/gpu/GrEffect.h

Index: include/gpu/GrEffect.h
===================================================================
--- include/gpu/GrEffect.h	(revision 8019)
+++ include/gpu/GrEffect.h	(working copy)
@@ -14,6 +14,7 @@
 #include "GrRefCnt.h"
 #include "GrTexture.h"
 #include "GrTextureAccess.h"
+#include "GrTypesPriv.h"
 
 class GrBackendEffectFactory;
 class GrContext;
@@ -136,6 +137,12 @@
     /** Shortcut for textureAccess(index).texture(); */
     GrTexture* texture(int index) const { return this->textureAccess(index).getTexture(); }
 
+
+    int numVertexAttribs() const { return fVertexAttribTypes.count(); }
+
+    GrSLType vertexAttribType(int index) const { return fVertexAttribTypes[index]; }
+
+
     /** Useful for effects that want to insert a texture matrix that is implied by the texture
         dimensions */
     static inline SkMatrix MakeDivByTextureWHMatrix(const GrTexture* texture) {
@@ -168,12 +175,18 @@
 
 protected:
     /**
-     * Subclasses call this from their constructor to register GrTextureAcceses. The effect subclass
-     * manages the lifetime of the accesses (this function only stores a pointer). This must only be
-     * called from the constructor because GrEffects are supposed to be immutable.
+     * Subclasses call this from their constructor to register GrTextureAccesses. The effect 
+     * subclass manages the lifetime of the accesses (this function only stores a pointer). This 
+     * must only be called from the constructor because GrEffects are immutable.
      */
     void addTextureAccess(const GrTextureAccess* textureAccess);
 
+    /**
+     * Subclasses call this from their constructor to register vertex attributes. This must only be

[bsalomon, 2013/03/08 14:31:58]

Should we document the current limitation here? (at most 2)

[jvanverth1, 2013/03/08 17:39:55]

Done. Also created a constant GrEffect::kMaxVertexAttribs.

+     * called from the constructor because GrEffects are immutable.
+     */
+    void addVertexAttrib(GrSLType type);
+
     GrEffect() : fEffectRef(NULL) {};
 
     /** This should be called by GrEffect subclass factories. See the comment on AutoEffectUnref for
@@ -247,6 +260,7 @@
                                 // to inc/dec deferred ref counts.
 
     SkSTArray<4, const GrTextureAccess*, true>  fTextureAccesses;
+    SkSTArray<2, GrSLType, true>                fVertexAttribTypes;
     GrEffectRef*                                fEffectRef;
 
     typedef GrRefCnt INHERITED;