Draft change to start pulling uniform color into GP

src/gpu/GrGeometryProcessor.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGeometryProcessor.h"
+
+#include "gl/GrGLGeometryProcessor.h"
+#include "GrInvariantOutput.h"
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+void GrGeometryProcessor::getInvariantOutputColor(GrInitInvariantOutput* out) const {
+    if (fHasVertexColor) {
+        if (fOpaqueVertexColors) {
+            out->setUnknownOpaqueFourComponents();
+        } else {
+            out->setUnknownFourComponents();
+        }
+    } else {
+        out->setKnownFourComponents(fColor);
+    }
+    this->onGetInvariantOutputColor(out);
+}
+
+void GrGeometryProcessor::getInvariantOutputCoverage(GrInitInvariantOutput* out) const {
+    this->onGetInvariantOutputCoverage(out);
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+void GrPathProcessor::getInvariantOutputColor(GrInitInvariantOutput* out) const {
+    out->setKnownFourComponents(fColor);
+}
+
+void GrPathProcessor::getInvariantOutputCoverage(GrInitInvariantOutput* out) const {
+    out->setKnownSingleComponent(0xff);
+}
+
+GrPathProcessor::GrPathProcessor(GrColor color) : fColor(color) {
+    this->initClassID<GrPathProcessor>();
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include "gl/builders/GrGLProgramBuilder.h"
+
+void GrGLGeometryProcessor::setupColor(GrGLGPBuilder* pb,

[bsalomon, 2014/12/15 15:31:13]

Maybe call it setupPassThroughColor? Not sure if it helps.

+                                       GrGPInput inputType,
+                                       const char* outputName,
+                                       const GrGeometryProcessor::GrAttribute* colorAttr,
+                                       UniformHandle* colorUniform) {
+    GrGLGPFragmentBuilder* fs = pb->getFragmentShaderBuilder();
+    if (kUniform_GrGPInput == inputType) {
+        const char* stagedLocalVarName;
+        *colorUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+                                        kVec4f_GrSLType,
+                                        kDefault_GrSLPrecision,
+                                        "Color",
+                                        &stagedLocalVarName);
+        fs->codeAppendf("%s = %s;", outputName, stagedLocalVarName);
+    } else if (kAttribute_GrGPInput == inputType) {
+        SkASSERT(colorAttr);
+        pb->addPassThroughAttribute(colorAttr, outputName);
+    } else if (kAllOnes_GrGPInput == inputType) {
+        fs->codeAppendf("%s = vec4(1);", outputName);
+    }
+}