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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef GrPathProcessor_DEFINED
      9 #define GrPathProcessor_DEFINED
     10 
     11 #include "GrPrimitiveProcessor.h"
     12 
     13 struct PathBatchTracker {
     14     GrGPInput fInputColorType;
     15     GrGPInput fInputCoverageType;
     16     GrColor fColor;
     17     bool fUsesLocalCoords;
     18 };
     19 
     20 /*
     21  * The path equivalent of the GP.  For now this just manages color. In the long term we plan on
     22  * extending this class to handle all nvpr uniform / varying / program work.
     23  */
     24 class GrPathProcessor : public GrPrimitiveProcessor {
     25 public:
     26     static GrPathProcessor* Create(GrColor color,
     27                                    const SkMatrix& viewMatrix = SkMatrix::I(),
     28                                    const SkMatrix& localMatrix = SkMatrix::I()) {
     29         return SkNEW_ARGS(GrPathProcessor, (color, viewMatrix, localMatrix));
     30     }
     31 
     32     void initBatchTracker(GrBatchTracker*, const GrPipelineInfo&) const override;
     33 
     34     bool canMakeEqual(const GrBatchTracker& mine,
     35                       const GrPrimitiveProcessor& that,
     36                       const GrBatchTracker& theirs) const override;
     37 
     38     const char* name() const override { return "PathProcessor"; }
     39 
     40     GrColor color() const { return fColor; }
     41     const SkMatrix& viewMatrix() const { return fViewMatrix; }
     42     const SkMatrix& localMatrix() const { return fLocalMatrix; }
     43 
     44 
     45     void getInvariantOutputColor(GrInitInvariantOutput* out) const override;
     46     void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override;
     47 
     48     bool willUseGeoShader() const override { return false; }
     49 
     50     virtual void getGLProcessorKey(const GrBatchTracker& bt,
     51                                    const GrGLSLCaps& caps,
     52                                    GrProcessorKeyBuilder* b) const override;
     53 
     54     virtual GrGLPrimitiveProcessor* createGLInstance(const GrBatchTracker& bt,
     55                                                      const GrGLSLCaps& caps) const override;
     56 
     57 private:
     58     GrPathProcessor(GrColor color, const SkMatrix& viewMatrix, const SkMatrix& localMatrix);
     59 
     60     /*
     61      * CanCombineOutput will return true if two draws are 'batchable' from a color perspective.
     62      * TODO is this really necessary?
     63      */
     64     static bool CanCombineOutput(GrGPInput left, GrColor lColor, GrGPInput right, GrColor rColor) {
     65         if (left != right) {
     66             return false;
     67         }
     68 
     69         if (kUniform_GrGPInput == left && lColor != rColor) {
     70             return false;
     71         }
     72 
     73         return true;
     74     }
     75 
     76     static bool CanCombineLocalMatrices(const GrPrimitiveProcessor& l,
     77                                         bool leftUsesLocalCoords,
     78                                         const GrPrimitiveProcessor& r,
     79                                         bool rightUsesLocalCoords) {
     80         if (leftUsesLocalCoords != rightUsesLocalCoords) {
     81             return false;
     82         }
     83 
     84         const GrPathProcessor& left = l.cast<GrPathProcessor>();
     85         const GrPathProcessor& right = r.cast<GrPathProcessor>();
     86         if (leftUsesLocalCoords && !left.localMatrix().cheapEqualTo(right.localMatrix())) {
     87             return false;
     88         }
     89         return true;
     90     }
     91 
     92     bool hasExplicitLocalCoords() const override { return false; }
     93 
     94     GrColor fColor;
     95     const SkMatrix fViewMatrix;
     96     const SkMatrix fLocalMatrix;
     97 
     98     typedef GrPrimitiveProcessor INHERITED;
     99 };
    100 
    101 #endif
    102