egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 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 "glsl/GrGLSLVarying.h" |
| 9 | |
| 10 | #include "glsl/GrGLSLProgramBuilder.h" |
| 11 | |
| 12 | void GrGLSLVaryingHandler::addPassThroughAttribute(const GrGeometryProcessor::Attribute* input, |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 13 | const char* output, GrSLPrecision precision) { |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 14 | GrSLType type = GrVertexAttribTypeToSLType(input->fType); |
| 15 | GrGLSLVertToFrag v(type); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 16 | this->addVarying(input->fName, &v, precision); |
| 17 | this->writePassThroughAttribute(input, output, v); |
| 18 | } |
| 19 | |
| 20 | void GrGLSLVaryingHandler::addFlatPassThroughAttribute(const GrGeometryProcessor::Attribute* input, |
| 21 | const char* output, |
| 22 | GrSLPrecision precision) { |
| 23 | GrSLType type = GrVertexAttribTypeToSLType(input->fType); |
| 24 | GrGLSLVertToFrag v(type); |
| 25 | this->addFlatVarying(input->fName, &v, precision); |
| 26 | this->writePassThroughAttribute(input, output, v); |
| 27 | } |
| 28 | |
| 29 | void GrGLSLVaryingHandler::writePassThroughAttribute(const GrGeometryProcessor::Attribute* input, |
| 30 | const char* output, const GrGLSLVarying& v) { |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 31 | fProgramBuilder->fVS.codeAppendf("%s = %s;", v.vsOut(), input->fName); |
| 32 | |
| 33 | if (fProgramBuilder->primitiveProcessor().willUseGeoShader()) { |
| 34 | fProgramBuilder->fGS.codeAppendf("%s = %s[0];", v.gsOut(), v.gsIn()); |
| 35 | } |
| 36 | |
| 37 | fProgramBuilder->fFS.codeAppendf("%s = %s;", output, v.fsIn()); |
| 38 | } |
| 39 | |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 40 | void GrGLSLVaryingHandler::internalAddVarying(const char* name, |
| 41 | GrGLSLVarying* varying, |
| 42 | GrSLPrecision precision, |
| 43 | bool flat) { |
| 44 | bool willUseGeoShader = fProgramBuilder->primitiveProcessor().willUseGeoShader(); |
| 45 | VaryingInfo& v = fVaryings.push_back(); |
| 46 | |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 47 | SkASSERT(varying); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 48 | v.fType = varying->fType; |
| 49 | v.fPrecision = precision; |
| 50 | v.fIsFlat = flat; |
| 51 | fProgramBuilder->nameVariable(&v.fVsOut, 'v', name); |
| 52 | v.fVisibility = kNone_GrShaderFlags; |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 53 | if (varying->vsVarying()) { |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 54 | varying->fVsOut = v.fVsOut.c_str(); |
| 55 | v.fVisibility |= kVertex_GrShaderFlag; |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 56 | } |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 57 | if (willUseGeoShader) { |
| 58 | fProgramBuilder->nameVariable(&v.fGsOut, 'g', name); |
| 59 | varying->fGsIn = v.fVsOut.c_str(); |
| 60 | varying->fGsOut = v.fGsOut.c_str(); |
| 61 | v.fVisibility |= kGeometry_GrShaderFlag; |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 62 | } |
| 63 | if (varying->fsVarying()) { |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 64 | varying->fFsIn = (willUseGeoShader ? v.fGsOut : v.fVsOut).c_str(); |
| 65 | v.fVisibility |= kFragment_GrShaderFlag; |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 66 | } |
| 67 | } |
| 68 | |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 69 | void GrGLSLVaryingHandler::emitAttributes(const GrGeometryProcessor& gp) { |
| 70 | int vaCount = gp.numAttribs(); |
| 71 | for (int i = 0; i < vaCount; i++) { |
| 72 | const GrGeometryProcessor::Attribute& attr = gp.getAttrib(i); |
| 73 | this->addAttribute(GrShaderVar(attr.fName, |
| 74 | GrVertexAttribTypeToSLType(attr.fType), |
| 75 | GrShaderVar::kAttribute_TypeModifier, |
| 76 | GrShaderVar::kNonArray, |
| 77 | attr.fPrecision)); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | void GrGLSLVaryingHandler::addAttribute(const GrShaderVar& var) { |
| 82 | SkASSERT(GrShaderVar::kAttribute_TypeModifier == var.getTypeModifier()); |
| 83 | for (int j = 0; j < fVertexInputs.count(); ++j) { |
| 84 | const GrGLSLShaderVar& attr = fVertexInputs[j]; |
| 85 | // if attribute already added, don't add it again |
| 86 | if (attr.getName().equals(var.getName())) { |
| 87 | return; |
| 88 | } |
| 89 | } |
| 90 | fVertexInputs.push_back(var); |
| 91 | } |
| 92 | |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 93 | void GrGLSLVaryingHandler::setNoPerspective() { |
| 94 | const GrGLSLCaps& caps = *fProgramBuilder->glslCaps(); |
| 95 | if (!caps.noperspectiveInterpolationSupport()) { |
| 96 | return; |
| 97 | } |
| 98 | if (const char* extension = caps.noperspectiveInterpolationExtensionString()) { |
cdalton | 8528541 | 2016-02-18 12:37:07 -0800 | [diff] [blame] | 99 | int bit = 1 << GrGLSLFragmentBuilder::kNoPerspectiveInterpolation_GLSLPrivateFeature; |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 100 | fProgramBuilder->fVS.addFeature(bit, extension); |
| 101 | if (fProgramBuilder->primitiveProcessor().willUseGeoShader()) { |
| 102 | fProgramBuilder->fGS.addFeature(bit, extension); |
| 103 | } |
| 104 | fProgramBuilder->fFS.addFeature(bit, extension); |
| 105 | } |
| 106 | fDefaultInterpolationModifier = "noperspective"; |
| 107 | } |
| 108 | |
egdaniel | b80ec8b | 2016-02-09 09:54:43 -0800 | [diff] [blame] | 109 | void GrGLSLVaryingHandler::finalize() { |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 110 | for (int i = 0; i < fVaryings.count(); ++i) { |
| 111 | const VaryingInfo& v = this->fVaryings[i]; |
| 112 | const char* modifier = v.fIsFlat ? "flat" : fDefaultInterpolationModifier; |
| 113 | if (v.fVisibility & kVertex_GrShaderFlag) { |
| 114 | fVertexOutputs.push_back().set(v.fType, GrShaderVar::kVaryingOut_TypeModifier, v.fVsOut, |
| 115 | v.fPrecision, nullptr, modifier); |
| 116 | if (v.fVisibility & kGeometry_GrShaderFlag) { |
| 117 | fGeomInputs.push_back().set(v.fType, GrShaderVar::kVaryingIn_TypeModifier, v.fVsOut, |
| 118 | GrShaderVar::kUnsizedArray, v.fPrecision, nullptr, |
| 119 | modifier); |
| 120 | } |
| 121 | } |
| 122 | if (v.fVisibility & kFragment_GrShaderFlag) { |
| 123 | const char* fsIn = v.fVsOut.c_str(); |
| 124 | if (v.fVisibility & kGeometry_GrShaderFlag) { |
| 125 | fGeomOutputs.push_back().set(v.fType, GrGLSLShaderVar::kVaryingOut_TypeModifier, |
| 126 | v.fGsOut, v.fPrecision, nullptr, modifier); |
| 127 | fsIn = v.fGsOut.c_str(); |
| 128 | } |
| 129 | fFragInputs.push_back().set(v.fType, GrShaderVar::kVaryingIn_TypeModifier, fsIn, |
| 130 | v.fPrecision, nullptr, modifier); |
| 131 | } |
| 132 | } |
egdaniel | b80ec8b | 2016-02-09 09:54:43 -0800 | [diff] [blame] | 133 | this->onFinalize(); |
| 134 | } |
| 135 | |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 136 | void GrGLSLVaryingHandler::appendDecls(const VarArray& vars, SkString* out) const { |
| 137 | for (int i = 0; i < vars.count(); ++i) { |
| 138 | vars[i].appendDecl(fProgramBuilder->glslCaps(), out); |
| 139 | out->append(";"); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | void GrGLSLVaryingHandler::getVertexDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 144 | this->appendDecls(fVertexInputs, inputDecls); |
| 145 | this->appendDecls(fVertexOutputs, outputDecls); |
| 146 | } |
| 147 | |
| 148 | void GrGLSLVaryingHandler::getGeomDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 149 | this->appendDecls(fGeomInputs, inputDecls); |
| 150 | this->appendDecls(fGeomOutputs, outputDecls); |
| 151 | } |
| 152 | |
| 153 | void GrGLSLVaryingHandler::getFragDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 154 | // We should not have any outputs in the fragment shader when using version 1.10 |
| 155 | SkASSERT(k110_GrGLSLGeneration != fProgramBuilder->glslCaps()->generation() || |
| 156 | fFragOutputs.empty()); |
| 157 | this->appendDecls(fFragInputs, inputDecls); |
| 158 | this->appendDecls(fFragOutputs, outputDecls); |
| 159 | } |