Add "sample locations" feature to GrProcessor

src/gpu/gl/GrGLProgramDesc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "GrGLProgramDesc.h"
 
 #include "GrProcessor.h"
 #include "GrPipeline.h"
+#include "GrRenderTargetPriv.h"
 #include "SkChecksum.h"
 #include "gl/GrGLDefines.h"
 #include "gl/GrGLTexture.h"
 #include "gl/GrGLTypes.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLCaps.h"
 
 static uint8_t texture_target_key(GrGLenum target) {
     switch (target) {
@@ skipping 119 matching lines @@
     requiredFeatures |= xp.requiredFeatures();
 
     // --------DO NOT MOVE HEADER ABOVE THIS LINE--------------------------------------------------
     // Because header is a pointer into the dynamic array, we can't push any new data into the key
     // below here.
     KeyHeader* header = glDesc->atOffset<KeyHeader, kHeaderOffset>();
 
     // make sure any padding in the header is zeroed.
     memset(header, 0, kHeaderSize);
 
-    if (requiredFeatures & GrProcessor::kFragmentPosition_RequiredFeature) {
-        header->fFragPosKey =
-                GrGLSLFragmentShaderBuilder::KeyForFragmentPosition(pipeline.getRenderTarget());
+    GrRenderTarget* rt = pipeline.getRenderTarget();
+
+    if (requiredFeatures & (GrProcessor::kFragmentPosition_RequiredFeature |
+                            GrProcessor::kSampleLocations_RequiredFeature)) {
+        header->fSurfaceOriginKey = GrGLSLFragmentShaderBuilder::KeyForSurfaceOrigin(rt->origin());
     } else {
-        header->fFragPosKey = 0;
+        header->fSurfaceOriginKey = 0;
     }
 
-    header->fOutputSwizzle =
-        glslCaps.configOutputSwizzle(pipeline.getRenderTarget()->config()).asKey();
+    if (requiredFeatures & GrProcessor::kSampleLocations_RequiredFeature) {
+        SkASSERT(pipeline.isHWAntialiasState());
+        header->fSamplePatternKey =
+            rt->renderTargetPriv().getMultisampleSpecs(pipeline.getStencil()).fUniqueID;
+    } else {
+        header->fSamplePatternKey = 0;
+    }
+
+    header->fOutputSwizzle = glslCaps.configOutputSwizzle(rt->config()).asKey();
 
     if (pipeline.ignoresCoverage()) {
         header->fIgnoresCoverage = 1;
     } else {
         header->fIgnoresCoverage = 0;
     }
 
     header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
     header->fColorEffectCnt = pipeline.numColorFragmentProcessors();
     header->fCoverageEffectCnt = pipeline.numCoverageFragmentProcessors();
     glDesc->finalize();
     return true;
 }