Make GPU coord transforms automatic

src/gpu/gl/GrGLEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLSL.h"
 #include "GrGLEffect.h"
+#include "GrCoordTransform.h"
 #include "GrDrawEffect.h"
 
 GrGLEffect::GrGLEffect(const GrBackendEffectFactory& factory)
     : fFactory(factory) {
 }
 
 GrGLEffect::~GrGLEffect() {
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrGLEffect::setData(const GrGLUniformManager&, const GrDrawEffect&) {
 }
 
 GrGLEffect::EffectKey GrGLEffect::GenTextureKey(const GrDrawEffect& drawEffect,
                                                 const GrGLCaps& caps) {
     EffectKey key = 0;
     int numTextures = (*drawEffect.effect())->numTextures();
     for (int index = 0; index < numTextures; ++index) {
         const GrTextureAccess& access = (*drawEffect.effect())->textureAccess(index);
         EffectKey value = GrGLShaderBuilder::KeyForTextureAccess(access, caps) << index;
         SkASSERT(0 == (value & key)); // keys for each access ought not to overlap
         key |= value;
     }
     return key;
 }
 
+GrGLEffect::EffectKey GrGLEffect::GenTransformKey(const GrDrawEffect& drawEffect) {
+    EffectKey key = 0;
+    int numTransforms = (*drawEffect.effect())->numTransforms();
+    for (int index = 0; index < numTransforms; ++index) {
+        EffectKey value = GrGLCoordTransform::GenKey(drawEffect, index);
+        value <<= index * GrGLCoordTransform::kKeyBits;
+        SkASSERT(0 == (value & key)); // keys for each transform ought not to overlap
+        key |= value;
+    }
+    return key;
+}
+
 GrGLEffect::EffectKey GrGLEffect::GenAttribKey(const GrDrawEffect& drawEffect) {
     EffectKey key = 0;
 
     int numAttributes = drawEffect.getVertexAttribIndexCount();
     SkASSERT(numAttributes <= 2);
     const int* attributeIndices = drawEffect.getVertexAttribIndices();
     for (int index = 0; index < numAttributes; ++index) {
         EffectKey value = attributeIndices[index] << 3*index;
         SkASSERT(0 == (value & key)); // keys for each attribute ought not to overlap
         key |= value;
     }
 
     return key;
 }