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Side by Side Diff: src/effects/gradients/SkGradientShader.cpp

Issue 1453623003: Move glsl onto EmitArgs struct for emitCode (Closed) Base URL: https://skia.googlesource.com/skia.git@moveShaders
Patch Set: nit Created 5 years, 1 month ago
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1 /* 1 /*
2 * Copyright 2006 The Android Open Source Project 2 * Copyright 2006 The Android Open Source Project
3 * 3 *
4 * Use of this source code is governed by a BSD-style license that can be 4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file. 5 * found in the LICENSE file.
6 */ 6 */
7 7
8 #include "SkGradientShaderPriv.h" 8 #include "SkGradientShaderPriv.h"
9 #include "SkLinearGradient.h" 9 #include "SkLinearGradient.h"
10 #include "SkRadialGradient.h" 10 #include "SkRadialGradient.h"
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1021 1021
1022 if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) { 1022 if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) {
1023 key |= kPremulBeforeInterpKey; 1023 key |= kPremulBeforeInterpKey;
1024 } 1024 }
1025 1025
1026 return key; 1026 return key;
1027 } 1027 }
1028 1028
1029 void GrGLGradientEffect::emitColor(GrGLSLFPBuilder* builder, 1029 void GrGLGradientEffect::emitColor(GrGLSLFPBuilder* builder,
1030 GrGLSLFragmentBuilder* fragBuilder, 1030 GrGLSLFragmentBuilder* fragBuilder,
1031 const GrGLSLCaps* glslCaps,
1031 const GrGradientEffect& ge, 1032 const GrGradientEffect& ge,
1032 const char* gradientTValue, 1033 const char* gradientTValue,
1033 const char* outputColor, 1034 const char* outputColor,
1034 const char* inputColor, 1035 const char* inputColor,
1035 const TextureSamplerArray& samplers) { 1036 const TextureSamplerArray& samplers) {
1036 if (SkGradientShaderBase::kTwo_GpuColorType == ge.getColorType()){ 1037 if (SkGradientShaderBase::kTwo_GpuColorType == ge.getColorType()){
1037 fragBuilder->codeAppendf("\tvec4 colorTemp = mix(%s, %s, clamp(%s, 0.0, 1.0));\n", 1038 fragBuilder->codeAppendf("\tvec4 colorTemp = mix(%s, %s, clamp(%s, 0.0, 1.0));\n",
1038 builder->getUniformVariable(fColorStartUni).c_s tr(), 1039 builder->getUniformVariable(fColorStartUni).c_s tr(),
1039 builder->getUniformVariable(fColorEndUni).c_str (), 1040 builder->getUniformVariable(fColorEndUni).c_str (),
1040 gradientTValue); 1041 gradientTValue);
1041 // Note that we could skip this step if both colors are known to be opaq ue. Two 1042 // Note that we could skip this step if both colors are known to be opaq ue. Two
1042 // considerations: 1043 // considerations:
1043 // The gradient SkShader reporting opaque is more restrictive than neces sary in the two pt 1044 // The gradient SkShader reporting opaque is more restrictive than neces sary in the two pt
1044 // case. Make sure the key reflects this optimization (and note that it can use the same 1045 // case. Make sure the key reflects this optimization (and note that it can use the same
1045 // shader as thekBeforeIterp case). This same optimization applies to th e 3 color case below. 1046 // shader as thekBeforeIterp case). This same optimization applies to th e 3 color case
1047 // below.
1046 if (GrGradientEffect::kAfterInterp_PremulType == ge.getPremulType()) { 1048 if (GrGradientEffect::kAfterInterp_PremulType == ge.getPremulType()) {
1047 fragBuilder->codeAppend("\tcolorTemp.rgb *= colorTemp.a;\n"); 1049 fragBuilder->codeAppend("\tcolorTemp.rgb *= colorTemp.a;\n");
1048 } 1050 }
1049 1051
1050 fragBuilder->codeAppendf("\t%s = %s;\n", outputColor, 1052 fragBuilder->codeAppendf("\t%s = %s;\n", outputColor,
1051 (GrGLSLExpr4(inputColor) * GrGLSLExpr4("colorTe mp")).c_str()); 1053 (GrGLSLExpr4(inputColor) * GrGLSLExpr4("colorTe mp")).c_str());
1052 } else if (SkGradientShaderBase::kThree_GpuColorType == ge.getColorType()) { 1054 } else if (SkGradientShaderBase::kThree_GpuColorType == ge.getColorType()) {
1053 fragBuilder->codeAppendf("\tfloat oneMinus2t = 1.0 - (2.0 * (%s));\n", 1055 fragBuilder->codeAppendf("\tfloat oneMinus2t = 1.0 - (2.0 * (%s));\n",
1054 gradientTValue); 1056 gradientTValue);
1055 fragBuilder->codeAppendf("\tvec4 colorTemp = clamp(oneMinus2t, 0.0, 1.0) * %s;\n", 1057 fragBuilder->codeAppendf("\tvec4 colorTemp = clamp(oneMinus2t, 0.0, 1.0) * %s;\n",
1056 builder->getUniformVariable(fColorStartUni).c_s tr()); 1058 builder->getUniformVariable(fColorStartUni).c_s tr());
1057 if (!builder->glslCaps()->canUseMinAndAbsTogether()) { 1059 if (!glslCaps->canUseMinAndAbsTogether()) {
1058 // The Tegra3 compiler will sometimes never return if we have 1060 // The Tegra3 compiler will sometimes never return if we have
1059 // min(abs(oneMinus2t), 1.0), or do the abs first in a separate expr ession. 1061 // min(abs(oneMinus2t), 1.0), or do the abs first in a separate expr ession.
1060 fragBuilder->codeAppend("\tfloat minAbs = abs(oneMinus2t);\n"); 1062 fragBuilder->codeAppend("\tfloat minAbs = abs(oneMinus2t);\n");
1061 fragBuilder->codeAppend("\tminAbs = minAbs > 1.0 ? 1.0 : minAbs;\n") ; 1063 fragBuilder->codeAppend("\tminAbs = minAbs > 1.0 ? 1.0 : minAbs;\n") ;
1062 fragBuilder->codeAppendf("\tcolorTemp += (1.0 - minAbs) * %s;\n", 1064 fragBuilder->codeAppendf("\tcolorTemp += (1.0 - minAbs) * %s;\n",
1063 builder->getUniformVariable(fColorMidUni).c _str()); 1065 builder->getUniformVariable(fColorMidUni).c _str());
1064 } else { 1066 } else {
1065 fragBuilder->codeAppendf("\tcolorTemp += (1.0 - min(abs(oneMinus2t), 1.0)) * %s;\n", 1067 fragBuilder->codeAppendf("\tcolorTemp += (1.0 - min(abs(oneMinus2t), 1.0)) * %s;\n",
1066 builder->getUniformVariable(fColorMidUni).c _str()); 1068 builder->getUniformVariable(fColorMidUni).c _str());
1067 } 1069 }
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1207 (*stops)[i] = stop; 1209 (*stops)[i] = stop;
1208 stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - st op) : 1.f; 1210 stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - st op) : 1.f;
1209 } 1211 }
1210 } 1212 }
1211 *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileM odeCount)); 1213 *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileM odeCount));
1212 1214
1213 return outColors; 1215 return outColors;
1214 } 1216 }
1215 1217
1216 #endif 1218 #endif
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