void GrGLMorphologyEffect::emitCode(EmitArgs& args) { const GrMorphologyEffect& me = args.fFp.cast<GrMorphologyEffect>(); GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; fPixelSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kFloat_GrSLType, kDefault_GrSLPrecision, "PixelSize"); const char* pixelSizeInc = uniformHandler->getUniformCStr(fPixelSizeUni); fRangeUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kVec2f_GrSLType, kDefault_GrSLPrecision, "Range"); const char* range = uniformHandler->getUniformCStr(fRangeUni); GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder; SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0); const char* func; switch (me.type()) { case GrMorphologyEffect::kErode_MorphologyType: fragBuilder->codeAppendf("\t\t%s = vec4(1, 1, 1, 1);\n", args.fOutputColor); func = "min"; break; case GrMorphologyEffect::kDilate_MorphologyType: fragBuilder->codeAppendf("\t\t%s = vec4(0, 0, 0, 0);\n", args.fOutputColor); func = "max"; break; default: SkFAIL("Unexpected type"); func = ""; // suppress warning break; } const char* dir; switch (me.direction()) { case Gr1DKernelEffect::kX_Direction: dir = "x"; break; case Gr1DKernelEffect::kY_Direction: dir = "y"; break; default: SkFAIL("Unknown filter direction."); dir = ""; // suppress warning } int width = GrMorphologyEffect::WidthFromRadius(me.radius()); // vec2 coord = coord2D; fragBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); // coord.x -= radius * pixelSize; fragBuilder->codeAppendf("\t\tcoord.%s -= %d.0 * %s; \n", dir, me.radius(), pixelSizeInc); if (me.useRange()) { // highBound = min(highBound, coord.x + (width-1) * pixelSize); fragBuilder->codeAppendf("\t\tfloat highBound = min(%s.y, coord.%s + %f * %s);", range, dir, float(width - 1), pixelSizeInc); // coord.x = max(lowBound, coord.x); fragBuilder->codeAppendf("\t\tcoord.%s = max(%s.x, coord.%s);", dir, range, dir); } fragBuilder->codeAppendf("\t\tfor (int i = 0; i < %d; i++) {\n", width); fragBuilder->codeAppendf("\t\t\t%s = %s(%s, ", args.fOutputColor, func, args.fOutputColor); fragBuilder->appendTextureLookup(args.fSamplers[0], "coord"); fragBuilder->codeAppend(");\n"); // coord.x += pixelSize; fragBuilder->codeAppendf("\t\t\tcoord.%s += %s;\n", dir, pixelSizeInc); if (me.useRange()) { // coord.x = min(highBound, coord.x); fragBuilder->codeAppendf("\t\t\tcoord.%s = min(highBound, coord.%s);", dir, dir); } fragBuilder->codeAppend("\t\t}\n"); SkString modulate; GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor); fragBuilder->codeAppend(modulate.c_str()); }
void GrGLDisplacementMapEffect::emitCode(EmitArgs& args) { const GrTextureDomain& domain = args.fFp.cast<GrDisplacementMapEffect>().domain(); fScaleUni = args.fUniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility, kVec2f_GrSLType, kDefault_GrSLPrecision, "Scale"); const char* scaleUni = args.fUniformHandler->getUniformCStr(fScaleUni); const char* dColor = "dColor"; const char* cCoords = "cCoords"; const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half float, use // a number smaller than that to approximate 0, but // leave room for 32-bit float GPU rounding errors. GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder; fragBuilder->codeAppendf("\t\tvec4 %s = ", dColor); fragBuilder->appendTextureLookup(args.fSamplers[0], args.fCoords[0].c_str(), args.fCoords[0].getType()); fragBuilder->codeAppend(";\n"); // Unpremultiply the displacement fragBuilder->codeAppendf( "\t\t%s.rgb = (%s.a < %s) ? vec3(0.0) : clamp(%s.rgb / %s.a, 0.0, 1.0);", dColor, dColor, nearZero, dColor, dColor); SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 1); fragBuilder->codeAppendf("\t\tvec2 %s = %s + %s*(%s.", cCoords, coords2D.c_str(), scaleUni, dColor); switch (fXChannelSelector) { case SkDisplacementMapEffect::kR_ChannelSelectorType: fragBuilder->codeAppend("r"); break; case SkDisplacementMapEffect::kG_ChannelSelectorType: fragBuilder->codeAppend("g"); break; case SkDisplacementMapEffect::kB_ChannelSelectorType: fragBuilder->codeAppend("b"); break; case SkDisplacementMapEffect::kA_ChannelSelectorType: fragBuilder->codeAppend("a"); break; case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: default: SkDEBUGFAIL("Unknown X channel selector"); } switch (fYChannelSelector) { case SkDisplacementMapEffect::kR_ChannelSelectorType: fragBuilder->codeAppend("r"); break; case SkDisplacementMapEffect::kG_ChannelSelectorType: fragBuilder->codeAppend("g"); break; case SkDisplacementMapEffect::kB_ChannelSelectorType: fragBuilder->codeAppend("b"); break; case SkDisplacementMapEffect::kA_ChannelSelectorType: fragBuilder->codeAppend("a"); break; case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: default: SkDEBUGFAIL("Unknown Y channel selector"); } fragBuilder->codeAppend("-vec2(0.5));\t\t"); fGLDomain.sampleTexture(fragBuilder, args.fUniformHandler, args.fGLSLCaps, domain, args.fOutputColor, SkString(cCoords), args.fSamplers[1]); fragBuilder->codeAppend(";\n"); }