Use vertexless shaders when NVpr is available

src/gpu/gl/GrGLProgramEffects.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 GrGLProgramEffects_DEFINED
 #define GrGLProgramEffects_DEFINED
 
 #include "GrBackendEffectFactory.h"
 #include "GrTexture.h"
 #include "GrTextureAccess.h"
 #include "GrGLUniformManager.h"
 
 class GrEffectStage;
-class GrGLProgramEffectsBuilder;
 class GrGLVertexProgramEffectsBuilder;
 class GrGLShaderBuilder;
 class GrGLFullShaderBuilder;
+class GrGLFragmentOnlyShaderBuilder;
 
 /**
  * This class encapsulates an array of GrGLEffects and their supporting data (coord transforms
  * and textures). It is built with GrGLProgramEffectsBuilder, then used to manage the necessary GL
  * state and shader uniforms.
  */
 class GrGLProgramEffects {
 public:
     typedef GrBackendEffectFactory::EffectKey EffectKey;
     typedef GrGLUniformManager::UniformHandle UniformHandle;
@@ skipping 18 matching lines @@
      */
     virtual void setData(GrGpuGL*,
                          const GrGLUniformManager&,
                          const GrEffectStage* effectStages[]) = 0;
 
     /**
      * Passed to GrGLEffects so they can add transformed coordinates to their shader code.
      */
     class TransformedCoords {
     public:
-        TransformedCoords(const char* name, GrSLType type)
+        TransformedCoords(const SkString& name, GrSLType type)
             : fName(name), fType(type) {
         }
 
         const char* c_str() const { return fName.c_str(); }
         GrSLType type() const { return fType; }
         const SkString& getName() const { return fName; }
 
     private:
         SkString fName;
         GrSLType fType;
@@ skipping 20 matching lines @@
 
     private:
         UniformHandle fSamplerUniform;
         uint32_t      fConfigComponentMask;
         char          fSwizzle[5];
     };
 
     typedef SkTArray<TextureSampler> TextureSamplerArray;
 
 protected:
-    friend class GrGLProgramEffectsBuilder;
-
     GrGLProgramEffects(int reserveCount)
         : fGLEffects(reserveCount)
         , fSamplers(reserveCount) {
     }
 
     /**
+     * Helper for emitEffect() in a subclasses. Emits uniforms for an effect's texture accesses and
+     * appends the necessary data to the TextureSamplerArray* object so effects can add texture
+     * lookups to their code. This method is only meant to be called during the construction phase.
+     */
+    void emitSamplers(GrGLShaderBuilder*, const GrEffectRef&, TextureSamplerArray*);
+
+    /**
      * Helper for setData(). Binds all the textures for an effect.
      */
     void bindTextures(GrGpuGL*, const GrEffectRef&, int effectIdx);
 
     struct Sampler {
         SkDEBUGCODE(Sampler() : fTextureUnit(-1) {})
         UniformHandle fUniform;
         int           fTextureUnit;
     };
 
     SkTArray<GrGLEffect*>                  fGLEffects;
     SkTArray<SkSTArray<4, Sampler, true> > fSamplers;
 };
 
 /**
+ * This is an abstract base class for constructing different types of GrGLProgramEffects objects.
+ */
+class GrGLProgramEffectsBuilder {
+public:
+    /**
+     * Emits the effect's shader code, and stores the necessary uniforms internally.
+     */
+    virtual void emitEffect(const GrEffectStage&,
+                            GrGLProgramEffects::EffectKey,
+                            const char* outColor,
+                            const char* inColor,
+                            int stageIndex) = 0;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+/**
  * This is a GrGLProgramEffects implementation that does coord transforms with the vertex shader.
  */
 class GrGLVertexProgramEffects : public GrGLProgramEffects {
 public:
     virtual void setData(GrGpuGL*,
                          const GrGLUniformManager&,
                          const GrEffectStage* effectStages[]) SK_OVERRIDE;
 
 private:
     friend class GrGLVertexProgramEffectsBuilder;
 
     GrGLVertexProgramEffects(int reserveCount, bool explicitLocalCoords)
         : INHERITED(reserveCount)
         , fTransforms(reserveCount)
         , fHasExplicitLocalCoords(explicitLocalCoords) {
     }
 
     /**
+     * Helper for GrGLProgramEffectsBuilder::emitEfffect(). This method is meant to only be called
+     * during the construction phase.
+     */
+    void emitEffect(GrGLFullShaderBuilder*,
+                    const GrEffectStage&,
+                    GrGLProgramEffects::EffectKey,
+                    const char* outColor,
+                    const char* inColor,
+                    int stageIndex);
+
+    /**
+     * Helper for emitEffect(). Emits any attributes an effect may have.
+     */
+    void emitAttributes(GrGLFullShaderBuilder*, const GrEffectStage&);
+
+    /**
+     * Helper for emitEffect(). Emits code to implement an effect's coord transforms in the VS.
+     * Varyings are added as an outputs of the VS and inputs to the FS. The varyings may be either a
+     * vec2f or vec3f depending upon whether perspective interpolation is required or not. The names
+     * of the varyings in the VS and FS as well their types are appended to the
+     * TransformedCoordsArray* object, which is in turn passed to the effect's emitCode() function.
+     */
+    void emitTransforms(GrGLFullShaderBuilder*,
+                        const GrEffectRef&,
+                        EffectKey,
+                        TransformedCoordsArray*);
+
+    /**
      * Helper for setData(). Sets all the transform matrices for an effect.
      */
     void setTransformData(const GrGLUniformManager&, const GrDrawEffect&, int effectIdx);
 
     struct Transform {
         Transform() { fCurrentValue = SkMatrix::InvalidMatrix(); }
         UniformHandle fHandle;
         GrSLType      fType;
         SkMatrix      fCurrentValue;
     };
 
     SkTArray<SkSTArray<2, Transform, true> > fTransforms;
     bool                                     fHasExplicitLocalCoords;
 
     typedef GrGLProgramEffects INHERITED;
 };
 
-////////////////////////////////////////////////////////////////////////////////
-
 /**
- * This is an abstract base class for constructing different types of GrGLProgramEffects objects.
- */
-class GrGLProgramEffectsBuilder {
-public:
-    /**
-     * Emits the effect's shader code, and stores the necessary uniforms internally.
-     */
-    virtual void emitEffect(const GrEffectStage&,
-                            GrGLProgramEffects::EffectKey,
-                            const char* outColor,
-                            const char* inColor,
-                            int stageIndex) = 0;
-
-protected:
-    /**
-     * Helper for emitEffect(). Emits uniforms for an effect's texture accesses and appends the
-     * necessary data to the TextureSamplerArray* object so effects can add texture lookups.
-     */
-    static void emitSamplers(GrGLShaderBuilder*,
-                             GrGLProgramEffects*,
-                             const GrEffectRef&,
-                             GrGLProgramEffects::TextureSamplerArray*);
-};
-
-/**
- * This class is used to construct a GrGLVertexProgramEffects object.
+ * This class is used to construct a GrGLVertexProgramEffects* object.
  */
 class GrGLVertexProgramEffectsBuilder : public GrGLProgramEffectsBuilder {
 public:
     GrGLVertexProgramEffectsBuilder(GrGLFullShaderBuilder*, 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:
+    GrGLFullShaderBuilder*                  fBuilder;
+    SkAutoTDelete<GrGLVertexProgramEffects> fProgramEffects;
+
+    typedef GrGLProgramEffectsBuilder 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)
+        , fTransforms(reserveCount) {
+    }
+
+    /**
+     * Helper for GrGLProgramEffectsBuilder::emitEfffect(). This method is meant to only be called
+     * during the construction phase.
+     */
+    void emitEffect(GrGLFragmentOnlyShaderBuilder*,
+                    const GrEffectStage&,
+                    GrGLProgramEffects::EffectKey,
+                    const char* outColor,
+                    const char* inColor,
+                    int stageIndex);
+
+    /**
+     * 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(GrGLFragmentOnlyShaderBuilder*,
+                     const GrEffectRef&,
+                     EffectKey,
+                     TransformedCoordsArray*);
+
+    /**
+     * Helper for setData(). Sets the TexGen state for each transform in an effect.
+     */
+    void setTexGenState(GrGpuGL*, const GrDrawEffect&, int effectIdx);
+
+    struct Transforms {
+        Transforms(EffectKey transformKey, int texCoordIndex)
+            : fTransformKey(transformKey), fTexCoordIndex(texCoordIndex) {}
+        EffectKey fTransformKey;
+        int fTexCoordIndex;
+    };
+
+    SkTArray<Transforms> fTransforms;
+
+    typedef GrGLProgramEffects INHERITED;
+};
+
+/**
+ * This class is used to construct a GrGLTexGenProgramEffects* object.
+ */
+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(). Emits any attributes an effect might have.
-     */
-    void emitAttributes(const GrEffectStage&);
-
-    /**
-     * Helper for emitEffect(). Emits code to implement an effect's coord transforms in the VS.
-     * Varyings are added as an outputs of the VS and inputs to the FS. The varyings may be either a
-     * vec2f or vec3f depending upon whether perspective interpolation is required or not. The names
-     * of the varyings in the VS and FS as well their types are appended to the
-     * TransformedCoordsArray* object, which is in turn passed to the effect's emitCode() function.
-     */
-    void emitTransforms(const GrEffectRef&,
-                        GrGLProgramEffects::EffectKey,
-                        GrGLProgramEffects::TransformedCoordsArray*);
-
-    GrGLFullShaderBuilder*                  fBuilder;
-    SkAutoTDelete<GrGLVertexProgramEffects> fProgramEffects;
+    GrGLFragmentOnlyShaderBuilder*          fBuilder;
+    SkAutoTDelete<GrGLTexGenProgramEffects> fProgramEffects;
 
     typedef GrGLProgramEffectsBuilder INHERITED;
 };
 
 #endif