Use vertexless shaders when NVpr is available

src/gpu/gl/GrGLProgramEffects.h

Index: src/gpu/gl/GrGLProgramEffects.h
diff --git a/src/gpu/gl/GrGLProgramEffects.h b/src/gpu/gl/GrGLProgramEffects.h
index f6f975ae4e76106a4c342e6b70d02248392657dc..837398b38f6cb9ce56e2f5b3c49c95954015e738 100644
--- a/src/gpu/gl/GrGLProgramEffects.h
+++ b/src/gpu/gl/GrGLProgramEffects.h
@@ -18,6 +18,7 @@ class GrGLProgramEffectsBuilder;
 class GrGLVertexProgramEffectsBuilder;
 class GrGLShaderBuilder;
 class GrGLFullShaderBuilder;
+class GrGLFragmentOnlyShaderBuilder;
 
 /**
  * This class encapsulates an array of GrGLEffects and their supporting data (coord transforms
@@ -56,7 +57,7 @@ public:
      */
     class TransformedCoords {
     public:
-        TransformedCoords(const char* name, GrSLType type)
+        TransformedCoords(const SkString& name, GrSLType type)
             : fName(name), fType(type) {
         }
 
@@ -155,6 +156,43 @@ private:
     typedef GrGLProgramEffects INHERITED;
 };
 
+/**
+ * This is a GrGLProgramEffects implementation that does coord transforms with the the built-in GL
+ * TexGen functionality.
+ */
+class GrGLTexGenProgramEffects : public GrGLProgramEffects {
+public:
+    virtual void setData(GrGpuGL*,
+                         const GrGLUniformManager&,
+                         const GrEffectStage* effectStages[]) SK_OVERRIDE;
+
+private:
+    friend class GrGLTexGenProgramEffectsBuilder;
+
+    GrGLTexGenProgramEffects(int reserveCount)
+        : INHERITED(reserveCount)
+#ifdef SK_DEBUG
+        , fFirstTexCoordIdx(0)

[Kimmo Kinnunen, 2013/10/04 11:02:33]

This variable is never set in release mode. Causes crashes.

+        , fNumTexCoordSets(0)
+#endif
+        , fTransformKeys(reserveCount) {
+    }
+
+    /**
+     * Helper for setData(). Sets the TexGen state for each transform in an effect. The transforms
+     * use adjacent texture units, starting with *texCoordIdx. Increments *texCoordIdx by the number
+     * of transforms before returning.
+     */
+    void setTexGenState(GrGpuGL*, const GrDrawEffect&, int* texCoordIdx, int effectIdx);
+
+    int                       fFirstTexCoordIdx;
+    SkDEBUGCODE(int           fNumTexCoordSets;)
+    SkTArray<EffectKey, true> fTransformKeys;
+
+    typedef GrGLProgramEffects INHERITED;
+};
+
+
 ////////////////////////////////////////////////////////////////////////////////
 
 /**
@@ -224,4 +262,42 @@ private:
     typedef GrGLProgramEffectsBuilder INHERITED;
 };
 
+/**
+ * This class is used by GrGLFragmentOnlyBuilder to construct a GrGLTexGenProgramEffects.
+ */
+class GrGLTexGenProgramEffectsBuilder : public GrGLProgramEffectsBuilder {
+public:
+    GrGLTexGenProgramEffectsBuilder(GrGLFragmentOnlyShaderBuilder*, int reserveCount);
+
+    virtual void emitEffect(const GrEffectStage&,
+                            GrGLProgramEffects::EffectKey,
+                            const char* outColor,
+                            const char* inColor,
+                            int stageIndex) SK_OVERRIDE;
+
+    /**
+     * Finalizes the building process and returns the effect array. After this call, the builder
+     * becomes invalid.
+     */
+    GrGLProgramEffects* finish() { return fProgramEffects.detach(); }
+
+private:
+    /**
+     * Helper for emitEffect(). Allocates texture units from the builder for each transform in an
+     * effect. The transforms all use adjacent texture units. They either use two or three of the
+     * coordinates at a given texture unit, depending on if they need perspective interpolation.
+     * The expressions to access the transformed coords (i.e. 'vec2(gl_TexCoord[0])') as well as the
+     * types are appended to the TransformedCoordsArray* object, which is in turn passed to the
+     * effect's emitCode() function.
+     */
+    void setupTexGen(const GrEffectRef&,
+                     GrGLProgramEffects::EffectKey,
+                     GrGLProgramEffects::TransformedCoordsArray*);
+
+    GrGLFragmentOnlyShaderBuilder*          fBuilder;
+    SkAutoTDelete<GrGLTexGenProgramEffects> fProgramEffects;
+
+    typedef GrGLProgramEffectsBuilder INHERITED;
+};
+
 #endif