Add "sample locations" feature to GrProcessor

tests/GLProgramsTest.cpp

Index: tests/GLProgramsTest.cpp
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index 81d1013dd0104775a937408f0978d38cae105885..8bd74456c078bfd74ac2fdcb49ff889a912b2b24 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -262,17 +262,19 @@ static void set_random_color_coverage_stages(GrPipelineBuilder* pipelineBuilder,
     }
 }
 
-static void set_random_state(GrPipelineBuilder* pipelineBuilder, SkRandom* random) {
-    int state = 0;
-    for (int i = 1; i <= GrPipelineBuilder::kLast_Flag; i <<= 1) {
-        state |= random->nextBool() * i;
-    }
-
+static void set_random_state(GrPipelineBuilder* pipelineBuilder, SkRandom* random,
+                             const GrCaps& caps) {
+    enum { kStateMask = GrPipelineBuilder::kLast_Flag | (GrPipelineBuilder::kLast_Flag - 1) };
+    int state = random->nextU() & kStateMask;
     // If we don't have an MSAA rendertarget then we have to disable useHWAA
     if ((state | GrPipelineBuilder::kHWAntialias_Flag) &&
-        !pipelineBuilder->getRenderTarget()->isUnifiedMultisampled()) {
+        !pipelineBuilder->getRenderTarget()->isStencilBufferMultisampled()) {
         state &= ~GrPipelineBuilder::kHWAntialias_Flag;
     }
+    // We can only use sample locations if they are supported and we have HWAA.
+    if (!caps.sampleLocationsSupport() || !(state & GrPipelineBuilder::kHWAntialias_Flag)) {
+        state &= ~GrPipelineBuilder::kSampleLocations_Flag;
+    }
     pipelineBuilder->enableState(state);
 }
 
@@ -352,7 +354,7 @@ bool GrDrawingManager::ProgramUnitTest(GrContext* context, int maxStages) {
         GrProcessorTestData ptd(&random, context, context->caps(), rt, dummyTextures);
         set_random_color_coverage_stages(&pipelineBuilder, &ptd, maxStages);
         set_random_xpf(&pipelineBuilder, &ptd);
-        set_random_state(&pipelineBuilder, &random);
+        set_random_state(&pipelineBuilder, &random, *context->caps());
         set_random_stencil(&pipelineBuilder, &random);
 
         SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(rt));