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| 1 /* |
| 2 * Copyright 2014 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "GrProcOptInfo.h" |
| 9 |
| 10 #include "GrGeometryProcessor.h" |
| 11 #include "GrProcessorStage.h" |
| 12 |
| 13 void GrProcOptInfo::calcWithInitialValues(const GrFragmentStage* stages, |
| 14 int stageCount, |
| 15 GrColor startColor, |
| 16 GrColorComponentFlags flags, |
| 17 bool areCoverageStages, |
| 18 const GrGeometryProcessor* gp) { |
| 19 fInOut.reset(startColor, flags, areCoverageStages); |
| 20 fFirstEffectStageIndex = 0; |
| 21 fInputColorIsUsed = true; |
| 22 fInputColor = startColor; |
| 23 fRemoveVertexAttrib = false; |
| 24 fReadsDst = false; |
| 25 |
| 26 if (areCoverageStages && gp) { |
| 27 gp->computeInvariantOutput(&fInOut); |
| 28 } |
| 29 |
| 30 for (int i = 0; i < stageCount; ++i) { |
| 31 const GrFragmentProcessor* processor = stages[i].getProcessor(); |
| 32 fInOut.resetWillUseInputColor(); |
| 33 processor->computeInvariantOutput(&fInOut); |
| 34 #ifdef SK_DEBUG |
| 35 fInOut.validate(); |
| 36 #endif |
| 37 if (!fInOut.willUseInputColor()) { |
| 38 fFirstEffectStageIndex = i; |
| 39 fInputColorIsUsed = false; |
| 40 fReadsDst = false; // Reset this since we don't care if previous sta
ges read dst |
| 41 } |
| 42 if (processor->willReadDstColor()) { |
| 43 fReadsDst = true; |
| 44 } |
| 45 if (kRGBA_GrColorComponentFlags == fInOut.validFlags()) { |
| 46 fFirstEffectStageIndex = i + 1; |
| 47 fInputColor = fInOut.color(); |
| 48 fInputColorIsUsed = true; |
| 49 fRemoveVertexAttrib = true; |
| 50 // Since we are clearing all previous color stages we are in a state
where we have found |
| 51 // zero stages that don't multiply the inputColor. |
| 52 fInOut.resetNonMulStageFound(); |
| 53 fReadsDst = false; // Reset this since we don't care if previous sta
ges read dst |
| 54 } |
| 55 } |
| 56 } |
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