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 | |
Brian Salomon | 94efbf5 | 2016-11-29 13:43:05 -0500 | [diff] [blame] | 8 | #include "GrShaderCaps.h" |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 9 | #include "glsl/GrGLSLVarying.h" |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 10 | #include "glsl/GrGLSLProgramBuilder.h" |
| 11 | |
| 12 | void GrGLSLVaryingHandler::addPassThroughAttribute(const GrGeometryProcessor::Attribute* input, |
Chris Dalton | 7b04631 | 2018-02-02 11:06:30 -0700 | [diff] [blame] | 13 | const char* output, |
| 14 | Interpolation interpolation) { |
csmartdalton | 276cc41 | 2016-11-21 11:55:00 -0700 | [diff] [blame] | 15 | SkASSERT(!fProgramBuilder->primitiveProcessor().willUseGeoShader()); |
Chris Dalton | 7b04631 | 2018-02-02 11:06:30 -0700 | [diff] [blame] | 16 | GrSLType type = GrVertexAttribTypeToSLType(input->fType); |
| 17 | GrGLSLVarying v(type); |
| 18 | this->addVarying(input->fName, &v, interpolation); |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 19 | fProgramBuilder->fVS.codeAppendf("%s = %s;", v.vsOut(), input->fName); |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 20 | fProgramBuilder->fFS.codeAppendf("%s = %s;", output, v.fsIn()); |
| 21 | } |
| 22 | |
Chris Dalton | 7b04631 | 2018-02-02 11:06:30 -0700 | [diff] [blame] | 23 | static bool use_flat_interpolation(GrGLSLVaryingHandler::Interpolation interpolation, |
| 24 | const GrShaderCaps& shaderCaps) { |
| 25 | switch (interpolation) { |
| 26 | using Interpolation = GrGLSLVaryingHandler::Interpolation; |
| 27 | case Interpolation::kInterpolated: |
| 28 | return false; |
| 29 | case Interpolation::kCanBeFlat: |
| 30 | SkASSERT(!shaderCaps.preferFlatInterpolation() || |
| 31 | shaderCaps.flatInterpolationSupport()); |
| 32 | return shaderCaps.preferFlatInterpolation(); |
| 33 | case Interpolation::kMustBeFlat: |
| 34 | SkASSERT(shaderCaps.flatInterpolationSupport()); |
| 35 | return true; |
| 36 | } |
| 37 | SK_ABORT("Invalid interpolation"); |
| 38 | return false; |
| 39 | } |
| 40 | |
| 41 | void GrGLSLVaryingHandler::addVarying(const char* name, GrGLSLVarying* varying, |
| 42 | Interpolation interpolation) { |
| 43 | SkASSERT(GrSLTypeIsFloatType(varying->type()) || Interpolation::kMustBeFlat == interpolation); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 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); |
Chris Dalton | 90e8fb1 | 2017-12-22 02:24:53 -0700 | [diff] [blame] | 48 | SkASSERT(kVoid_GrSLType != varying->fType); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 49 | v.fType = varying->fType; |
Chris Dalton | 7b04631 | 2018-02-02 11:06:30 -0700 | [diff] [blame] | 50 | v.fIsFlat = use_flat_interpolation(interpolation, *fProgramBuilder->shaderCaps()); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 51 | fProgramBuilder->nameVariable(&v.fVsOut, 'v', name); |
| 52 | v.fVisibility = kNone_GrShaderFlags; |
Chris Dalton | 2737288 | 2017-12-08 13:34:21 -0700 | [diff] [blame] | 53 | if (varying->isInVertexShader()) { |
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 | } |
Chris Dalton | 2737288 | 2017-12-08 13:34:21 -0700 | [diff] [blame] | 63 | if (varying->isInFragmentShader()) { |
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), |
Brian Salomon | f31ae49 | 2016-11-18 15:35:33 -0500 | [diff] [blame] | 75 | GrShaderVar::kIn_TypeModifier, |
Ethan Nicholas | fa7ee24 | 2017-09-25 09:52:04 -0400 | [diff] [blame] | 76 | GrShaderVar::kNonArray)); |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 77 | } |
| 78 | } |
| 79 | |
| 80 | void GrGLSLVaryingHandler::addAttribute(const GrShaderVar& var) { |
Brian Salomon | f31ae49 | 2016-11-18 15:35:33 -0500 | [diff] [blame] | 81 | SkASSERT(GrShaderVar::kIn_TypeModifier == var.getTypeModifier()); |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 82 | for (int j = 0; j < fVertexInputs.count(); ++j) { |
Brian Salomon | 99938a8 | 2016-11-21 13:41:08 -0500 | [diff] [blame] | 83 | const GrShaderVar& attr = fVertexInputs[j]; |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 84 | // if attribute already added, don't add it again |
| 85 | if (attr.getName().equals(var.getName())) { |
| 86 | return; |
| 87 | } |
| 88 | } |
| 89 | fVertexInputs.push_back(var); |
| 90 | } |
| 91 | |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 92 | void GrGLSLVaryingHandler::setNoPerspective() { |
Brian Salomon | 94efbf5 | 2016-11-29 13:43:05 -0500 | [diff] [blame] | 93 | const GrShaderCaps& caps = *fProgramBuilder->shaderCaps(); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 94 | if (!caps.noperspectiveInterpolationSupport()) { |
| 95 | return; |
| 96 | } |
| 97 | if (const char* extension = caps.noperspectiveInterpolationExtensionString()) { |
cdalton | 8528541 | 2016-02-18 12:37:07 -0800 | [diff] [blame] | 98 | int bit = 1 << GrGLSLFragmentBuilder::kNoPerspectiveInterpolation_GLSLPrivateFeature; |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 99 | fProgramBuilder->fVS.addFeature(bit, extension); |
| 100 | if (fProgramBuilder->primitiveProcessor().willUseGeoShader()) { |
| 101 | fProgramBuilder->fGS.addFeature(bit, extension); |
| 102 | } |
| 103 | fProgramBuilder->fFS.addFeature(bit, extension); |
| 104 | } |
| 105 | fDefaultInterpolationModifier = "noperspective"; |
| 106 | } |
| 107 | |
egdaniel | b80ec8b | 2016-02-09 09:54:43 -0800 | [diff] [blame] | 108 | void GrGLSLVaryingHandler::finalize() { |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 109 | for (int i = 0; i < fVaryings.count(); ++i) { |
| 110 | const VaryingInfo& v = this->fVaryings[i]; |
| 111 | const char* modifier = v.fIsFlat ? "flat" : fDefaultInterpolationModifier; |
| 112 | if (v.fVisibility & kVertex_GrShaderFlag) { |
Brian Salomon | 99938a8 | 2016-11-21 13:41:08 -0500 | [diff] [blame] | 113 | fVertexOutputs.push_back().set(v.fType, v.fVsOut, GrShaderVar::kOut_TypeModifier, |
Chris Dalton | fdde34e | 2017-10-16 14:15:26 -0600 | [diff] [blame] | 114 | kDefault_GrSLPrecision, nullptr, modifier); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 115 | if (v.fVisibility & kGeometry_GrShaderFlag) { |
Brian Salomon | 99938a8 | 2016-11-21 13:41:08 -0500 | [diff] [blame] | 116 | fGeomInputs.push_back().set(v.fType, v.fVsOut, GrShaderVar::kUnsizedArray, |
Chris Dalton | fdde34e | 2017-10-16 14:15:26 -0600 | [diff] [blame] | 117 | GrShaderVar::kIn_TypeModifier, kDefault_GrSLPrecision, |
| 118 | nullptr, modifier); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 119 | } |
| 120 | } |
| 121 | if (v.fVisibility & kFragment_GrShaderFlag) { |
| 122 | const char* fsIn = v.fVsOut.c_str(); |
| 123 | if (v.fVisibility & kGeometry_GrShaderFlag) { |
Brian Salomon | 99938a8 | 2016-11-21 13:41:08 -0500 | [diff] [blame] | 124 | fGeomOutputs.push_back().set(v.fType, v.fGsOut, GrShaderVar::kOut_TypeModifier, |
Chris Dalton | fdde34e | 2017-10-16 14:15:26 -0600 | [diff] [blame] | 125 | kDefault_GrSLPrecision, nullptr, modifier); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 126 | fsIn = v.fGsOut.c_str(); |
| 127 | } |
Chris Dalton | fdde34e | 2017-10-16 14:15:26 -0600 | [diff] [blame] | 128 | fFragInputs.push_back().set(v.fType, fsIn, GrShaderVar::kIn_TypeModifier, |
| 129 | kDefault_GrSLPrecision, nullptr, modifier); |
cdalton | c08f196 | 2016-02-12 12:14:06 -0800 | [diff] [blame] | 130 | } |
| 131 | } |
egdaniel | b80ec8b | 2016-02-09 09:54:43 -0800 | [diff] [blame] | 132 | this->onFinalize(); |
| 133 | } |
| 134 | |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 135 | void GrGLSLVaryingHandler::appendDecls(const VarArray& vars, SkString* out) const { |
| 136 | for (int i = 0; i < vars.count(); ++i) { |
Brian Salomon | 94efbf5 | 2016-11-29 13:43:05 -0500 | [diff] [blame] | 137 | vars[i].appendDecl(fProgramBuilder->shaderCaps(), out); |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 138 | out->append(";"); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | void GrGLSLVaryingHandler::getVertexDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 143 | this->appendDecls(fVertexInputs, inputDecls); |
| 144 | this->appendDecls(fVertexOutputs, outputDecls); |
| 145 | } |
| 146 | |
| 147 | void GrGLSLVaryingHandler::getGeomDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 148 | this->appendDecls(fGeomInputs, inputDecls); |
| 149 | this->appendDecls(fGeomOutputs, outputDecls); |
| 150 | } |
| 151 | |
| 152 | void GrGLSLVaryingHandler::getFragDecls(SkString* inputDecls, SkString* outputDecls) const { |
| 153 | // We should not have any outputs in the fragment shader when using version 1.10 |
Brian Salomon | 94efbf5 | 2016-11-29 13:43:05 -0500 | [diff] [blame] | 154 | SkASSERT(k110_GrGLSLGeneration != fProgramBuilder->shaderCaps()->generation() || |
egdaniel | 0eafe79 | 2015-11-20 14:01:22 -0800 | [diff] [blame] | 155 | fFragOutputs.empty()); |
| 156 | this->appendDecls(fFragInputs, inputDecls); |
| 157 | this->appendDecls(fFragOutputs, outputDecls); |
| 158 | } |