Attach GrOptDrawState into shader building pipeline

src/gpu/GrOptDrawState.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 "GrOptDrawState.h"
 
 #include "GrDrawState.h"
 
-GrOptDrawState::GrOptDrawState(const GrDrawState& drawState) : INHERITED(drawState) {
+GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
+                               BlendOptFlags blendOptFlags,
+                               GrBlendCoeff optSrcCoeff,
+                               GrBlendCoeff optDstCoeff) : INHERITED(drawState) {
     fColor = drawState.getColor();
     fCoverage = drawState.getCoverage();
     fViewMatrix = drawState.getViewMatrix();
     fBlendConstant = drawState.getBlendConstant();
     fFlagBits = drawState.getFlagBits();
     fVAPtr = drawState.getVertexAttribs();
     fVACount = drawState.getVertexAttribCount();
     fVAStride = drawState.getVertexStride();
     fStencilSettings = drawState.getStencil();
     fDrawFace = drawState.getDrawFace();
-
-    fBlendOptFlags = drawState.getBlendOpts(false, &fSrcBlend, &fDstBlend);
+    fBlendOptFlags = blendOptFlags;
+    fSrcBlend = optSrcCoeff;
+    fDstBlend = optDstCoeff;
 
     memcpy(fFixedFunctionVertexAttribIndices,
             drawState.getFixedFunctionVertexAttribIndices(),
             sizeof(fFixedFunctionVertexAttribIndices));
 
+
     fInputColorIsUsed = true;
     fInputCoverageIsUsed = true;
 
     if (drawState.hasGeometryProcessor()) {
         fGeometryProcessor.reset(SkNEW_ARGS(GrEffectStage, (*drawState.getGeometryProcessor())));
     } else {
         fGeometryProcessor.reset(NULL);
     }
 
     this->copyEffectiveColorStages(drawState);
     this->copyEffectiveCoverageStages(drawState);
+    this->adjustFromBlendOpts();
 };
 
+void GrOptDrawState::adjustFromBlendOpts() {
+
+    switch (fBlendOptFlags) {
+        case kNone_BlendOpt:
+        case kSkipDraw_BlendOptFlag:
+            break;
+        case kCoverageAsAlpha_BlendOptFlag:
+            fFlagBits |= kCoverageDrawing_StateBit;
+            break;
+        case kEmitCoverage_BlendOptFlag:
+            fColor = 0xffffffff;
+            fInputColorIsUsed = true;
+            fColorStages.reset();
+            this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding);
+            break;
+        case kEmitTransBlack_BlendOptFlag:
+            fColor = 0;
+            fCoverage = 0xff;
+            fInputColorIsUsed = true;
+            fInputCoverageIsUsed = true;
+            fColorStages.reset();
+            fCoverageStages.reset();
+            this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding |
+                                                   0x1 << kCoverage_GrVertexAttribBinding);
+            break;
+        default:
+            SkFAIL("Unknown BlendOptFlag");
+
+    }
+}
+
 void GrOptDrawState::removeFixedFunctionVertexAttribs(uint8_t removeVAFlag) {
     int numToRemove = 0;
     uint8_t maskCheck = 0x1;
     // Count the number of vertex attributes that we will actually remove
     for (int i = 0; i < kGrFixedFunctionVertexAttribBindingCnt; ++i) {
         if ((maskCheck & removeVAFlag) && -1 != fFixedFunctionVertexAttribIndices[i]) {
             ++numToRemove;
         }
         maskCheck <<= 1;
     }
+
     fOptVA.reset(fVACount - numToRemove);
 
     GrVertexAttrib* dst = fOptVA.get();
     const GrVertexAttrib* src = fVAPtr;
 
     for (int i = 0, newIdx = 0; i < fVACount; ++i, ++src) {
         const GrVertexAttrib& currAttrib = *src;
         if (currAttrib.fBinding < kGrFixedFunctionVertexAttribBindingCnt) {
             uint8_t maskCheck = 0x1 << currAttrib.fBinding;
             if (maskCheck & removeVAFlag) {
                 SkASSERT(-1 != fFixedFunctionVertexAttribIndices[currAttrib.fBinding]);
                 fFixedFunctionVertexAttribIndices[currAttrib.fBinding] = -1;
                 continue;
             }
+            fFixedFunctionVertexAttribIndices[currAttrib.fBinding] = newIdx;
         }
         memcpy(dst, src, sizeof(GrVertexAttrib));
-        fFixedFunctionVertexAttribIndices[currAttrib.fBinding] = newIdx;
         ++newIdx;
         ++dst;
     }
     fVACount -= numToRemove;
     fVAPtr = fOptVA.get();
 }
 
 void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
     int firstColorStage = 0;
 
@@ skipping 58 matching lines @@
                               ds.numCoverageStages() - firstCoverageStage);
     } else {
         fCoverageStages.reset();
     }
 }
 
 bool GrOptDrawState::operator== (const GrOptDrawState& that) const {
     return this->isEqual(that);
 }