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, |
| 13 | const char* output) { |
| 14 | GrSLType type = GrVertexAttribTypeToSLType(input->fType); |
| 15 | GrGLSLVertToFrag v(type); |
| 16 | this->addVarying(input->fName, &v); |
| 17 | fProgramBuilder->fVS.codeAppendf("%s = %s;", v.vsOut(), input->fName); |
| 18 | |
| 19 | if (fProgramBuilder->primitiveProcessor().willUseGeoShader()) { |
| 20 | fProgramBuilder->fGS.codeAppendf("%s = %s[0];", v.gsOut(), v.gsIn()); |
| 21 | } |
| 22 | |
| 23 | fProgramBuilder->fFS.codeAppendf("%s = %s;", output, v.fsIn()); |
| 24 | } |
| 25 | |
| 26 | void GrGLSLVaryingHandler::addVarying(const char* name, |
| 27 | GrGLSLVarying* varying, |
| 28 | GrSLPrecision precision) { |
| 29 | SkASSERT(varying); |
| 30 | if (varying->vsVarying()) { |
| 31 | this->addVertexVarying(name, precision, varying); |
| 32 | } |
| 33 | if (fProgramBuilder->primitiveProcessor().willUseGeoShader()) { |
| 34 | this->addGeomVarying(name, precision, varying); |
| 35 | } |
| 36 | if (varying->fsVarying()) { |
| 37 | this->addFragVarying(precision, varying); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | void GrGLSLVaryingHandler::addVertexVarying(const char* name, |
| 42 | GrSLPrecision precision, |
| 43 | GrGLSLVarying* v) { |
| 44 | fVertexOutputs.push_back(); |
| 45 | fVertexOutputs.back().setType(v->fType); |
| 46 | fVertexOutputs.back().setTypeModifier(GrGLSLShaderVar::kVaryingOut_TypeModifier); |
| 47 | fVertexOutputs.back().setPrecision(precision); |
| 48 | fProgramBuilder->nameVariable(fVertexOutputs.back().accessName(), 'v', name); |
| 49 | v->fVsOut = fVertexOutputs.back().getName().c_str(); |
| 50 | } |
| 51 | void GrGLSLVaryingHandler::addGeomVarying(const char* name, |
| 52 | GrSLPrecision precision, |
| 53 | GrGLSLVarying* v) { |
| 54 | // if we have a GS take each varying in as an array |
| 55 | // and output as non-array. |
| 56 | if (v->vsVarying()) { |
| 57 | fGeomInputs.push_back(); |
| 58 | fGeomInputs.back().setType(v->fType); |
| 59 | fGeomInputs.back().setTypeModifier(GrGLSLShaderVar::kVaryingIn_TypeModifier); |
| 60 | fGeomInputs.back().setPrecision(precision); |
| 61 | fGeomInputs.back().setUnsizedArray(); |
| 62 | *fGeomInputs.back().accessName() = v->fVsOut; |
| 63 | v->fGsIn = v->fVsOut; |
| 64 | } |
| 65 | |
| 66 | if (v->fsVarying()) { |
| 67 | fGeomOutputs.push_back(); |
| 68 | fGeomOutputs.back().setType(v->fType); |
| 69 | fGeomOutputs.back().setTypeModifier(GrGLSLShaderVar::kVaryingOut_TypeModifier); |
| 70 | fGeomOutputs.back().setPrecision(precision); |
| 71 | fProgramBuilder->nameVariable(fGeomOutputs.back().accessName(), 'g', name); |
| 72 | v->fGsOut = fGeomOutputs.back().getName().c_str(); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | void GrGLSLVaryingHandler::addFragVarying(GrSLPrecision precision, GrGLSLVarying* v) { |
| 77 | v->fFsIn = v->fGsOut ? v->fGsOut : v->fVsOut; |
| 78 | fFragInputs.push_back().set(v->fType, |
| 79 | GrGLSLShaderVar::kVaryingIn_TypeModifier, |
| 80 | v->fFsIn, |
| 81 | precision); |
| 82 | } |
| 83 | |
| 84 | void GrGLSLVaryingHandler::emitAttributes(const GrGeometryProcessor& gp) { |
| 85 | int vaCount = gp.numAttribs(); |
| 86 | for (int i = 0; i < vaCount; i++) { |
| 87 | const GrGeometryProcessor::Attribute& attr = gp.getAttrib(i); |
| 88 | this->addAttribute(GrShaderVar(attr.fName, |
| 89 | GrVertexAttribTypeToSLType(attr.fType), |
| 90 | GrShaderVar::kAttribute_TypeModifier, |
| 91 | GrShaderVar::kNonArray, |
| 92 | attr.fPrecision)); |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | void GrGLSLVaryingHandler::addAttribute(const GrShaderVar& var) { |
| 97 | SkASSERT(GrShaderVar::kAttribute_TypeModifier == var.getTypeModifier()); |
| 98 | for (int j = 0; j < fVertexInputs.count(); ++j) { |
| 99 | const GrGLSLShaderVar& attr = fVertexInputs[j]; |
| 100 | // if attribute already added, don't add it again |
| 101 | if (attr.getName().equals(var.getName())) { |
| 102 | return; |
| 103 | } |
| 104 | } |
| 105 | fVertexInputs.push_back(var); |
| 106 | } |
| 107 | |
| 108 | void GrGLSLVaryingHandler::appendDecls(const VarArray& vars, SkString* out) const { |
| 109 | for (int i = 0; i < vars.count(); ++i) { |
| 110 | vars[i].appendDecl(fProgramBuilder->glslCaps(), out); |
| 111 | out->append(";"); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | void GrGLSLVaryingHandler::getVertexDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 116 | this->appendDecls(fVertexInputs, inputDecls); |
| 117 | this->appendDecls(fVertexOutputs, outputDecls); |
| 118 | } |
| 119 | |
| 120 | void GrGLSLVaryingHandler::getGeomDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 121 | this->appendDecls(fGeomInputs, inputDecls); |
| 122 | this->appendDecls(fGeomOutputs, outputDecls); |
| 123 | } |
| 124 | |
| 125 | void GrGLSLVaryingHandler::getFragDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 126 | // We should not have any outputs in the fragment shader when using version 1.10 |
| 127 | SkASSERT(k110_GrGLSLGeneration != fProgramBuilder->glslCaps()->generation() || |
| 128 | fFragOutputs.empty()); |
| 129 | this->appendDecls(fFragInputs, inputDecls); |
| 130 | this->appendDecls(fFragOutputs, outputDecls); |
| 131 | } |
| 132 | |