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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 "gl/GrGLXferProcessor.h" | |
| 9 | |
| 10 #include "GrXferProcessor.h" | |
| 11 #include "glsl/GrGLSLFragmentShaderBuilder.h" | |
| 12 #include "glsl/GrGLSLProgramBuilder.h" | |
| 13 #include "glsl/GrGLSLProgramDataManager.h" | |
| 14 | |
| 15 void GrGLXferProcessor::emitCode(const EmitArgs& args) { | |
| 16 if (!args.fXP.willReadDstColor()) { | |
| 17 this->emitOutputsForBlendState(args); | |
| 18 return; | |
| 19 } | |
| 20 | |
| 21 GrGLSLXPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); | |
| 22 const char* dstColor = fsBuilder->dstColor(); | |
| 23 | |
| 24 if (args.fXP.getDstTexture()) { | |
| 25 bool topDown = kTopLeft_GrSurfaceOrigin == args.fXP.getDstTexture()->ori
gin(); | |
| 26 | |
| 27 if (args.fXP.readsCoverage()) { | |
| 28 // We don't think any shaders actually output negative coverage, but
just as a safety | |
| 29 // check for floating point precision errors we compare with <= here | |
| 30 fsBuilder->codeAppendf("if (all(lessThanEqual(%s, vec4(0)))) {" | |
| 31 " discard;" | |
| 32 "}", args.fInputCoverage); | |
| 33 } | |
| 34 | |
| 35 const char* dstTopLeftName; | |
| 36 const char* dstCoordScaleName; | |
| 37 | |
| 38 fDstTopLeftUni = args.fPB->addUniform(GrGLSLProgramBuilder::kFragment_Vi
sibility, | |
| 39 kVec2f_GrSLType, | |
| 40 kDefault_GrSLPrecision, | |
| 41 "DstTextureUpperLeft", | |
| 42 &dstTopLeftName); | |
| 43 fDstScaleUni = args.fPB->addUniform(GrGLSLProgramBuilder::kFragment_Visi
bility, | |
| 44 kVec2f_GrSLType, | |
| 45 kDefault_GrSLPrecision, | |
| 46 "DstTextureCoordScale", | |
| 47 &dstCoordScaleName); | |
| 48 const char* fragPos = fsBuilder->fragmentPosition(); | |
| 49 | |
| 50 fsBuilder->codeAppend("// Read color from copy of the destination.\n"); | |
| 51 fsBuilder->codeAppendf("vec2 _dstTexCoord = (%s.xy - %s) * %s;", | |
| 52 fragPos, dstTopLeftName, dstCoordScaleName); | |
| 53 | |
| 54 if (!topDown) { | |
| 55 fsBuilder->codeAppend("_dstTexCoord.y = 1.0 - _dstTexCoord.y;"); | |
| 56 } | |
| 57 | |
| 58 fsBuilder->codeAppendf("vec4 %s = ", dstColor); | |
| 59 fsBuilder->appendTextureLookup(args.fSamplers[0], "_dstTexCoord", kVec2f
_GrSLType); | |
| 60 fsBuilder->codeAppend(";"); | |
| 61 } | |
| 62 | |
| 63 this->emitBlendCodeForDstRead(args.fPB, args.fInputColor, dstColor, args.fOu
tputPrimary, | |
| 64 args.fXP); | |
| 65 | |
| 66 // Apply coverage. | |
| 67 if (args.fXP.dstReadUsesMixedSamples()) { | |
| 68 if (args.fXP.readsCoverage()) { | |
| 69 fsBuilder->codeAppendf("%s *= %s;", args.fOutputPrimary, args.fInput
Coverage); | |
| 70 fsBuilder->codeAppendf("%s = %s;", args.fOutputSecondary, args.fInpu
tCoverage); | |
| 71 } else { | |
| 72 fsBuilder->codeAppendf("%s = vec4(1.0);", args.fOutputSecondary); | |
| 73 } | |
| 74 } else if (args.fXP.readsCoverage()) { | |
| 75 fsBuilder->codeAppendf("%s = %s * %s + (vec4(1.0) - %s) * %s;", | |
| 76 args.fOutputPrimary, args.fInputCoverage, | |
| 77 args.fOutputPrimary, args.fInputCoverage, dstColo
r); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 void GrGLXferProcessor::setData(const GrGLSLProgramDataManager& pdm, const GrXfe
rProcessor& xp) { | |
| 82 if (xp.getDstTexture()) { | |
| 83 if (fDstTopLeftUni.isValid()) { | |
| 84 pdm.set2f(fDstTopLeftUni, static_cast<float>(xp.dstTextureOffset().f
X), | |
| 85 static_cast<float>(xp.dstTextureOffset().fY)); | |
| 86 pdm.set2f(fDstScaleUni, 1.f / xp.getDstTexture()->width(), | |
| 87 1.f / xp.getDstTexture()->height()); | |
| 88 } else { | |
| 89 SkASSERT(!fDstScaleUni.isValid()); | |
| 90 } | |
| 91 } else { | |
| 92 SkASSERT(!fDstTopLeftUni.isValid()); | |
| 93 SkASSERT(!fDstScaleUni.isValid()); | |
| 94 } | |
| 95 this->onSetData(pdm, xp); | |
| 96 } | |
| 97 | |
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Chromium Code Reviews
Issue 1440073002:
Move XferProcessors to glsl (Closed)
Base URL: https://skia.googlesource.com/skia.git@fragProcs