Calculate stage stats in GrOptDrawState

src/gpu/GrOptDrawState.h

Index: src/gpu/GrOptDrawState.h
diff --git a/src/gpu/GrOptDrawState.h b/src/gpu/GrOptDrawState.h
index 544f1f53ba2dcd969cb2bc1b3550f0672b382cb5..5c6b6036f06c998dbe778c4ed08f89bb51b7cb66 100644
--- a/src/gpu/GrOptDrawState.h
+++ b/src/gpu/GrOptDrawState.h
@@ -23,6 +23,10 @@ public:
     bool inputColorIsUsed() const { return fInputColorIsUsed; }
     bool inputCoverageIsUsed() const { return fInputCoverageIsUsed; }
 
+    bool readsDst() const { return fReadsDst; }
+    bool readsFragPosition() const { return fReadsFragPosition; }
+    bool requiresVertexShader() const { return fRequiresVertexShader; }
+
 private:
     /**
      * Constructs and optimized drawState out of a GrRODrawState.
@@ -73,11 +77,22 @@ private:
      */
     void remapEffectStagesVAIndices();
 
+    /**
+     * Loop over the effect stages to determine various info like what data they will read and what
+     * shaders they require.
+     */
+    void getStageStats();
+
     // These flags are needed to protect the code from creating an unused uniform color/coverage
     // which will cause shader compiler errors.
     bool            fInputColorIsUsed;
     bool            fInputCoverageIsUsed;
 
+    // These flags give general info on the effect stages that are used when building the programs

[bsalomon, 2014/09/05 15:27:55]

general info -> aggregated info?

[egdaniel, 2014/09/08 19:19:49]

Done.

+    bool            fReadsDst;
+    bool            fReadsFragPosition;
+    bool            fRequiresVertexShader;
+
     SkAutoSTArray<4, GrVertexAttrib> fOptVA;
     SkAutoSTArray<4, int> fVAIndexMap;