Adds local coords to GrEffect system.

src/gpu/effects/GrSimpleTextureEffect.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSimpleTextureEffect_DEFINED
 #define GrSimpleTextureEffect_DEFINED
 
 #include "GrSingleTextureEffect.h"
 
 class GrGLSimpleTextureEffect;
 
 /**
  * The output color of this effect is a modulation of the input color and a sample from a texture.
- * The coord to sample the texture is determine by a matrix. It allows explicit specification of
- * the filtering and wrap modes (GrTextureParams).
+ * It allows explicit specification of the filtering and wrap modes (GrTextureParams). It can use
+ * local coords, positions, or a custom vertex attribute as input texture coords. The input coords
+ * can have a matrix applied in the VS in both the local and position cases but not with a custom
+ * attribute coords at this time. It will add a varying to input interpolate texture coords to the
+ * FS.
  */
 class GrSimpleTextureEffect : public GrSingleTextureEffect {
 public:
     /* unfiltered, clamp mode */
-    static GrEffectRef* Create(GrTexture* tex, const SkMatrix& matrix) {
-        AutoEffectUnref effect(SkNEW_ARGS(GrSimpleTextureEffect, (tex, matrix)));
+    static GrEffectRef* Create(GrTexture* tex,
+                               const SkMatrix& matrix,
+                               CoordsType coordsType = kLocal_CoordsType) {
+        GrAssert(kLocal_CoordsType == coordsType || kPosition_CoordsType == coordsType);
+        AutoEffectUnref effect(SkNEW_ARGS(GrSimpleTextureEffect, (tex, matrix, false, coordsType)));
         return CreateEffectRef(effect);
     }
 
     /* clamp mode */
-    static GrEffectRef* Create(GrTexture* tex, const SkMatrix& matrix, bool bilerp) {
-        AutoEffectUnref effect(SkNEW_ARGS(GrSimpleTextureEffect, (tex, matrix, bilerp)));
+    static GrEffectRef* Create(GrTexture* tex,
+                               const SkMatrix& matrix,
+                               bool bilerp,
+                               CoordsType coordsType = kLocal_CoordsType) {
+        GrAssert(kLocal_CoordsType == coordsType || kPosition_CoordsType == coordsType);
+        AutoEffectUnref effect(
+            SkNEW_ARGS(GrSimpleTextureEffect, (tex, matrix, bilerp, coordsType)));
         return CreateEffectRef(effect);
     }
 
-    static GrEffectRef* Create(GrTexture* tex, const SkMatrix& matrix, const GrTextureParams& p) {
-        AutoEffectUnref effect(SkNEW_ARGS(GrSimpleTextureEffect, (tex, matrix, p)));
+    static GrEffectRef* Create(GrTexture* tex,
+                               const SkMatrix& matrix,
+                               const GrTextureParams& p,
+                               CoordsType coordsType = kLocal_CoordsType) {
+        GrAssert(kLocal_CoordsType == coordsType || kPosition_CoordsType == coordsType);
+        AutoEffectUnref effect(SkNEW_ARGS(GrSimpleTextureEffect, (tex, matrix, p, coordsType)));
+        return CreateEffectRef(effect);
+    }
+
+    /** Variant that requires the client to install a custom kVec2 vertex attribute that will be
+        the source of the coords. No matrix is allowed in this mode. */
+    static GrEffectRef* CreateWithCustomCoords(GrTexture* tex, const GrTextureParams& p) {
+        AutoEffectUnref effect(SkNEW_ARGS(GrSimpleTextureEffect, (tex,
+                                                                  SkMatrix::I(),
+                                                                  p,
+                                                                  kCustom_CoordsType)));
         return CreateEffectRef(effect);
     }
 
     virtual ~GrSimpleTextureEffect() {}
 
     static const char* Name() { return "Texture"; }
 
     virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
 
     typedef GrGLSimpleTextureEffect GLEffect;
 
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
 
 private:
-    GrSimpleTextureEffect(GrTexture* texture, const SkMatrix& matrix)
-        : GrSingleTextureEffect(texture, matrix) {}
-    GrSimpleTextureEffect(GrTexture* texture, const SkMatrix& matrix, bool bilerp)
-        : GrSingleTextureEffect(texture, matrix, bilerp) {}
-    GrSimpleTextureEffect(GrTexture* texture, const SkMatrix& matrix, const GrTextureParams& params)
-        : GrSingleTextureEffect(texture, matrix, params) {}
+    GrSimpleTextureEffect(GrTexture* texture,
+                          const SkMatrix& matrix,
+                          bool bilerp,
+                          CoordsType coordsType)
+        : GrSingleTextureEffect(texture, matrix, bilerp, coordsType) {
+        GrAssert(kLocal_CoordsType == coordsType || kPosition_CoordsType == coordsType);
+    }
+
+    GrSimpleTextureEffect(GrTexture* texture,
+                          const SkMatrix& matrix,
+                          const GrTextureParams& params,
+                          CoordsType coordsType)
+        : GrSingleTextureEffect(texture, matrix, params, coordsType) {
+        if (kCustom_CoordsType == coordsType) {
+            GrAssert(matrix.isIdentity());
+            this->addVertexAttrib(kVec2f_GrSLType);
+        }
+    }
 
     virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE {
         const GrSimpleTextureEffect& ste = CastEffect<GrSimpleTextureEffect>(other);
-        return this->hasSameTextureParamsAndMatrix(ste);
+        return this->hasSameTextureParamsMatrixAndCoordsType(ste);
     }
 
     GR_DECLARE_EFFECT_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif