Move VertexBuilder to a GrGLFullShaderBuilder subclass

src/gpu/gl/GrGLEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLEffect_DEFINED
 #define GrGLEffect_DEFINED
 
 #include "GrBackendEffectFactory.h"
 #include "GrGLProgramEffects.h"
 #include "GrGLShaderBuilder.h"
 #include "GrGLShaderVar.h"
 #include "GrGLSL.h"
 
-class GrGLTexture;
-
 /** @file
     This file contains specializations for OpenGL of the shader stages declared in
     include/gpu/GrEffect.h. Objects of type GrGLEffect are responsible for emitting the
     GLSL code that implements a GrEffect and for uploading uniforms at draw time. If they don't
     always emit the same GLSL code, they must have a function:
         static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&)
     that is used to implement a program cache. When two GrEffects produce the same key this means
     that their GrGLEffects would emit the same GLSL code.
 
     The GrGLEffect subclass must also have a constructor of the form:
         EffectSubclass::EffectSubclass(const GrBackendEffectFactory&, const GrDrawEffect&)
     The effect held by the GrDrawEffect is guaranteed to be of the type that generated the
     GrGLEffect subclass instance.
 
     These objects are created by the factory object returned by the GrEffect::getFactory().
 */
 
 class GrDrawEffect;
+class GrGLTexture;
+class GrGLVertexEffect;
 
 class GrGLEffect {
 
 public:
     typedef GrBackendEffectFactory::EffectKey EffectKey;
     typedef GrGLProgramEffects::TransformedCoordsArray TransformedCoordsArray;
     typedef GrGLProgramEffects::TextureSamplerArray TextureSamplerArray;
 
     enum {
         kNoEffectKey = GrBackendEffectFactory::kNoEffectKey,
         // the number of bits in EffectKey available to GenKey
         kEffectKeyBits = GrBackendEffectFactory::kEffectKeyBits,
     };
 
-    GrGLEffect(const GrBackendEffectFactory& factory) : fFactory(factory) {}
+    GrGLEffect(const GrBackendEffectFactory& factory)
+        : fFactory(factory)
+        , fIsVertexEffect(false) {
+    }
 
     virtual ~GrGLEffect() {}
 
     /** Called when the program stage should insert its code into the shaders. The code in each
         shader will be in its own block ({}) and so locally scoped names will not collide across
         stages.
 
         @param builder      Interface used to emit code in the shaders.
         @param drawEffect   A wrapper on the effect that generated this program stage.
         @param key          The key that was computed by GenKey() from the generating GrEffect.
@@ skipping 24 matching lines @@
         guaranteed to be of the same type that created this GrGLEffect and to have an identical
         EffectKey as the one that created this GrGLEffect. Effects that use local coords have
         to consider whether the GrEffectStage's coord change matrix should be used. When explicit
         local coordinates are used it can be ignored. */
     virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) {}
 
     const char* name() const { return fFactory.name(); }
 
     static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&) { return 0; }
 
+    /** Used by the system when generating shader code, to see if this effect can be downcasted to
+        the internal GrGLVertexEffect type */
+    bool isVertexEffect() const { return fIsVertexEffect; }
+
 protected:
     const GrBackendEffectFactory& fFactory;
+
+private:
+    friend class GrGLVertexEffect; // to set fIsVertexEffect
+
+    bool fIsVertexEffect;
 };
 
 #endif