Replace fWillReadFragmentPosition with a bitfield

Replaces fWillReadFragmentPosition on GrProcessor with a
"RequiredFeatures" bitfield. This will allow us to add additional
built-in features. Completely removes information about reading the
fragment position from GrPipeline and GrProcOptInfo.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1734163002

Review URL: https://codereview.chromium.org/1734163002

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gpu/glsl/GrGLSLProgramBuilder.h b/src/gpu/glsl/GrGLSLProgramBuilder.h
index 164423cce9..b8669bf2f6 100644
--- a/src/gpu/glsl/GrGLSLProgramBuilder.h
+++ b/src/gpu/glsl/GrGLSLProgramBuilder.h
@@ -105,7 +105,7 @@ private:
     // fragment shader are cleared.
     void reset() {
         this->addStage();
-        fFS.reset();
+        SkDEBUGCODE(fFS.resetVerification();)
     }
     void addStage() { fStageIndex++; }
 
@@ -141,9 +141,11 @@ private:
                                 GrPixelLocalStorageState plsState);
     void emitFSOutputSwizzle(bool hasSecondaryOutput);
 
+#ifdef SK_DEBUG
     void verify(const GrPrimitiveProcessor&);
     void verify(const GrXferProcessor&);
     void verify(const GrFragmentProcessor&);
+#endif
 
     virtual void emitSamplers(const GrProcessor& processor,
                               GrGLSLTextureSampler::TextureSamplerArray* outSamplers) = 0;