Replace fWillReadFragmentPosition with a bitfield

src/gpu/GrFragmentProcessor.cpp

 
 /*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "GrFragmentProcessor.h"
 #include "GrCoordTransform.h"
@@ skipping 78 matching lines @@
                                      child->fCoordTransforms.begin());
     }
     if (!child->fTextureAccesses.empty()) {
         fTextureAccesses.push_back_n(child->fTextureAccesses.count(),
                                      child->fTextureAccesses.begin());
     }
 
     int index = fChildProcessors.count();
     fChildProcessors.push_back(SkRef(child));
 
-    if (child->willReadFragmentPosition()) {
-        this->setWillReadFragmentPosition();
-    }
+    this->combineRequiredFeatures(*child);
 
     if (child->usesLocalCoords()) {
         fUsesLocalCoords = true;
     }
 
     return index;
 }
 
 void GrFragmentProcessor::notifyRefCntIsZero() const {
     // See comment above GrProgramElement for a detailed explanation of why we do this.
@@ skipping 257 matching lines @@
         }
     }
 
     if (1 == cnt) {
         return SkRef(series[0]);
     } else {
         return new SeriesFragmentProcessor(series, cnt);
     }
 }