egdaniel | 8dcdedc | 2015-11-11 06:27:20 -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/GrGLSLProgramBuilder.h" |
| 9 | |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 10 | #include "GrPipeline.h" |
| 11 | #include "glsl/GrGLSLFragmentProcessor.h" |
| 12 | #include "glsl/GrGLSLGeometryProcessor.h" |
| 13 | #include "glsl/GrGLSLXferProcessor.h" |
| 14 | |
egdaniel | 8dcdedc | 2015-11-11 06:27:20 -0800 | [diff] [blame] | 15 | const int GrGLSLProgramBuilder::kVarsPerBlock = 8; |
| 16 | |
| 17 | GrGLSLProgramBuilder::GrGLSLProgramBuilder(const DrawArgs& args) |
| 18 | : fVS(this) |
| 19 | , fGS(this) |
| 20 | , fFS(this, args.fDesc->header().fFragPosKey) |
| 21 | , fStageIndex(-1) |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 22 | , fArgs(args) |
| 23 | , fGeometryProcessor(nullptr) |
| 24 | , fXferProcessor(nullptr) { |
| 25 | } |
| 26 | |
| 27 | bool GrGLSLProgramBuilder::emitAndInstallProcs(GrGLSLExpr4* inputColor, |
| 28 | GrGLSLExpr4* inputCoverage, |
| 29 | int maxTextures) { |
| 30 | // First we loop over all of the installed processors and collect coord transforms. These will |
| 31 | // be sent to the GrGLSLPrimitiveProcessor in its emitCode function |
| 32 | const GrPrimitiveProcessor& primProc = this->primitiveProcessor(); |
| 33 | int totalTextures = primProc.numTextures(); |
| 34 | |
| 35 | for (int i = 0; i < this->pipeline().numFragmentProcessors(); i++) { |
| 36 | const GrFragmentProcessor& processor = this->pipeline().getFragmentProcessor(i); |
| 37 | |
| 38 | if (!primProc.hasTransformedLocalCoords()) { |
| 39 | SkTArray<const GrCoordTransform*, true>& procCoords = fCoordTransforms.push_back(); |
| 40 | processor.gatherCoordTransforms(&procCoords); |
| 41 | } |
| 42 | |
| 43 | totalTextures += processor.numTextures(); |
| 44 | if (totalTextures >= maxTextures) { |
| 45 | GrCapsDebugf(this->caps(), "Program would use too many texture units\n"); |
| 46 | return false; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | this->emitAndInstallPrimProc(primProc, inputColor, inputCoverage); |
| 51 | |
| 52 | int numProcs = this->pipeline().numFragmentProcessors(); |
| 53 | this->emitAndInstallFragProcs(0, this->pipeline().numColorFragmentProcessors(), inputColor); |
| 54 | this->emitAndInstallFragProcs(this->pipeline().numColorFragmentProcessors(), numProcs, |
| 55 | inputCoverage); |
ethannicholas | 2279325 | 2016-01-30 09:59:10 -0800 | [diff] [blame] | 56 | if (primProc.getPixelLocalStorageState() != |
| 57 | GrPixelLocalStorageState::kDraw_GrPixelLocalStorageState) { |
| 58 | this->emitAndInstallXferProc(this->pipeline().getXferProcessor(), *inputColor, |
| 59 | *inputCoverage, this->pipeline().ignoresCoverage(), |
| 60 | primProc.getPixelLocalStorageState()); |
| 61 | this->emitFSOutputSwizzle(this->pipeline().getXferProcessor().hasSecondaryOutput()); |
| 62 | } |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 63 | return true; |
| 64 | } |
| 65 | |
| 66 | void GrGLSLProgramBuilder::emitAndInstallPrimProc(const GrPrimitiveProcessor& proc, |
| 67 | GrGLSLExpr4* outputColor, |
| 68 | GrGLSLExpr4* outputCoverage) { |
| 69 | // Program builders have a bit of state we need to clear with each effect |
| 70 | AutoStageAdvance adv(this); |
| 71 | this->nameExpression(outputColor, "outputColor"); |
| 72 | this->nameExpression(outputCoverage, "outputCoverage"); |
| 73 | |
| 74 | // Enclose custom code in a block to avoid namespace conflicts |
| 75 | SkString openBrace; |
| 76 | openBrace.printf("{ // Stage %d, %s\n", fStageIndex, proc.name()); |
| 77 | fFS.codeAppend(openBrace.c_str()); |
| 78 | fVS.codeAppendf("// Primitive Processor %s\n", proc.name()); |
| 79 | |
| 80 | SkASSERT(!fGeometryProcessor); |
| 81 | fGeometryProcessor = proc.createGLSLInstance(*this->glslCaps()); |
| 82 | |
| 83 | SkSTArray<4, GrGLSLTextureSampler> samplers(proc.numTextures()); |
| 84 | this->emitSamplers(proc, &samplers); |
| 85 | |
| 86 | GrGLSLGeometryProcessor::EmitArgs args(&fVS, |
| 87 | &fFS, |
| 88 | this->varyingHandler(), |
| 89 | this->uniformHandler(), |
| 90 | this->glslCaps(), |
| 91 | proc, |
| 92 | outputColor->c_str(), |
| 93 | outputCoverage->c_str(), |
| 94 | samplers, |
| 95 | fCoordTransforms, |
| 96 | &fOutCoords); |
| 97 | fGeometryProcessor->emitCode(args); |
| 98 | |
| 99 | // We have to check that effects and the code they emit are consistent, ie if an effect |
| 100 | // asks for dst color, then the emit code needs to follow suit |
| 101 | verify(proc); |
| 102 | |
| 103 | fFS.codeAppend("}"); |
| 104 | } |
| 105 | |
| 106 | void GrGLSLProgramBuilder::emitAndInstallFragProcs(int procOffset, |
| 107 | int numProcs, |
| 108 | GrGLSLExpr4* inOut) { |
| 109 | for (int i = procOffset; i < numProcs; ++i) { |
| 110 | GrGLSLExpr4 output; |
| 111 | const GrFragmentProcessor& fp = this->pipeline().getFragmentProcessor(i); |
| 112 | this->emitAndInstallFragProc(fp, i, *inOut, &output); |
| 113 | *inOut = output; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | // TODO Processors cannot output zeros because an empty string is all 1s |
| 118 | // the fix is to allow effects to take the GrGLSLExpr4 directly |
| 119 | void GrGLSLProgramBuilder::emitAndInstallFragProc(const GrFragmentProcessor& fp, |
| 120 | int index, |
| 121 | const GrGLSLExpr4& input, |
| 122 | GrGLSLExpr4* output) { |
| 123 | // Program builders have a bit of state we need to clear with each effect |
| 124 | AutoStageAdvance adv(this); |
| 125 | this->nameExpression(output, "output"); |
| 126 | |
| 127 | // Enclose custom code in a block to avoid namespace conflicts |
| 128 | SkString openBrace; |
| 129 | openBrace.printf("{ // Stage %d, %s\n", fStageIndex, fp.name()); |
| 130 | fFS.codeAppend(openBrace.c_str()); |
| 131 | |
| 132 | GrGLSLFragmentProcessor* fragProc = fp.createGLSLInstance(); |
| 133 | |
| 134 | SkSTArray<4, GrGLSLTextureSampler> samplers(fp.numTextures()); |
| 135 | this->emitSamplers(fp, &samplers); |
| 136 | |
| 137 | GrGLSLFragmentProcessor::EmitArgs args(&fFS, |
| 138 | this->uniformHandler(), |
| 139 | this->glslCaps(), |
| 140 | fp, |
| 141 | output->c_str(), |
| 142 | input.isOnes() ? nullptr : input.c_str(), |
| 143 | fOutCoords[index], |
| 144 | samplers); |
| 145 | fragProc->emitCode(args); |
| 146 | |
| 147 | // We have to check that effects and the code they emit are consistent, ie if an effect |
| 148 | // asks for dst color, then the emit code needs to follow suit |
| 149 | verify(fp); |
| 150 | fFragmentProcessors.push_back(fragProc); |
| 151 | |
| 152 | fFS.codeAppend("}"); |
| 153 | } |
| 154 | |
| 155 | void GrGLSLProgramBuilder::emitAndInstallXferProc(const GrXferProcessor& xp, |
| 156 | const GrGLSLExpr4& colorIn, |
| 157 | const GrGLSLExpr4& coverageIn, |
ethannicholas | 2279325 | 2016-01-30 09:59:10 -0800 | [diff] [blame] | 158 | bool ignoresCoverage, |
| 159 | GrPixelLocalStorageState plsState) { |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 160 | // Program builders have a bit of state we need to clear with each effect |
| 161 | AutoStageAdvance adv(this); |
| 162 | |
| 163 | SkASSERT(!fXferProcessor); |
| 164 | fXferProcessor = xp.createGLSLInstance(); |
| 165 | |
| 166 | // Enable dual source secondary output if we have one |
| 167 | if (xp.hasSecondaryOutput()) { |
| 168 | fFS.enableSecondaryOutput(); |
| 169 | } |
| 170 | |
| 171 | if (this->glslCaps()->mustDeclareFragmentShaderOutput()) { |
| 172 | fFS.enableCustomOutput(); |
| 173 | } |
| 174 | |
| 175 | SkString openBrace; |
| 176 | openBrace.printf("{ // Xfer Processor: %s\n", xp.name()); |
| 177 | fFS.codeAppend(openBrace.c_str()); |
| 178 | |
| 179 | SkSTArray<4, GrGLSLTextureSampler> samplers(xp.numTextures()); |
| 180 | this->emitSamplers(xp, &samplers); |
| 181 | |
ethannicholas | 2279325 | 2016-01-30 09:59:10 -0800 | [diff] [blame] | 182 | bool usePLSDstRead = (plsState == GrPixelLocalStorageState::kFinish_GrPixelLocalStorageState); |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 183 | GrGLSLXferProcessor::EmitArgs args(&fFS, |
| 184 | this->uniformHandler(), |
| 185 | this->glslCaps(), |
| 186 | xp, colorIn.c_str(), |
| 187 | ignoresCoverage ? nullptr : coverageIn.c_str(), |
| 188 | fFS.getPrimaryColorOutputName(), |
| 189 | fFS.getSecondaryColorOutputName(), |
ethannicholas | 2279325 | 2016-01-30 09:59:10 -0800 | [diff] [blame] | 190 | samplers, |
| 191 | usePLSDstRead); |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 192 | fXferProcessor->emitCode(args); |
| 193 | |
| 194 | // We have to check that effects and the code they emit are consistent, ie if an effect |
| 195 | // asks for dst color, then the emit code needs to follow suit |
| 196 | verify(xp); |
| 197 | fFS.codeAppend("}"); |
| 198 | } |
| 199 | |
| 200 | void GrGLSLProgramBuilder::emitFSOutputSwizzle(bool hasSecondaryOutput) { |
| 201 | // Swizzle the fragment shader outputs if necessary. |
| 202 | GrSwizzle swizzle; |
| 203 | swizzle.setFromKey(this->desc().header().fOutputSwizzle); |
| 204 | if (swizzle != GrSwizzle::RGBA()) { |
| 205 | fFS.codeAppendf("%s = %s.%s;", fFS.getPrimaryColorOutputName(), |
| 206 | fFS.getPrimaryColorOutputName(), |
| 207 | swizzle.c_str()); |
| 208 | if (hasSecondaryOutput) { |
| 209 | fFS.codeAppendf("%s = %s.%s;", fFS.getSecondaryColorOutputName(), |
| 210 | fFS.getSecondaryColorOutputName(), |
| 211 | swizzle.c_str()); |
| 212 | } |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | void GrGLSLProgramBuilder::verify(const GrPrimitiveProcessor& gp) { |
| 217 | SkASSERT(fFS.hasReadFragmentPosition() == gp.willReadFragmentPosition()); |
| 218 | } |
| 219 | |
| 220 | void GrGLSLProgramBuilder::verify(const GrXferProcessor& xp) { |
| 221 | SkASSERT(fFS.hasReadDstColor() == xp.willReadDstColor()); |
| 222 | } |
| 223 | |
| 224 | void GrGLSLProgramBuilder::verify(const GrFragmentProcessor& fp) { |
| 225 | SkASSERT(fFS.hasReadFragmentPosition() == fp.willReadFragmentPosition()); |
egdaniel | 8dcdedc | 2015-11-11 06:27:20 -0800 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | void GrGLSLProgramBuilder::nameVariable(SkString* out, char prefix, const char* name, bool mangle) { |
| 229 | if ('\0' == prefix) { |
| 230 | *out = name; |
| 231 | } else { |
| 232 | out->printf("%c%s", prefix, name); |
| 233 | } |
| 234 | if (mangle) { |
| 235 | if (out->endsWith('_')) { |
| 236 | // Names containing "__" are reserved. |
| 237 | out->append("x"); |
| 238 | } |
| 239 | out->appendf("_Stage%d%s", fStageIndex, fFS.getMangleString().c_str()); |
| 240 | } |
| 241 | } |
| 242 | |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 243 | void GrGLSLProgramBuilder::nameExpression(GrGLSLExpr4* output, const char* baseName) { |
| 244 | // create var to hold stage result. If we already have a valid output name, just use that |
| 245 | // otherwise create a new mangled one. This name is only valid if we are reordering stages |
| 246 | // and have to tell stage exactly where to put its output. |
| 247 | SkString outName; |
| 248 | if (output->isValid()) { |
| 249 | outName = output->c_str(); |
| 250 | } else { |
| 251 | this->nameVariable(&outName, '\0', baseName); |
| 252 | } |
| 253 | fFS.codeAppendf("vec4 %s;", outName.c_str()); |
| 254 | *output = outName; |
| 255 | } |
| 256 | |
egdaniel | 8dcdedc | 2015-11-11 06:27:20 -0800 | [diff] [blame] | 257 | void GrGLSLProgramBuilder::appendUniformDecls(ShaderVisibility visibility, |
| 258 | SkString* out) const { |
egdaniel | 7ea439b | 2015-12-03 09:20:44 -0800 | [diff] [blame] | 259 | this->uniformHandler()->appendUniformDecls(visibility, out); |
| 260 | } |
| 261 | |
| 262 | void GrGLSLProgramBuilder::addRTAdjustmentUniform(GrSLPrecision precision, |
| 263 | const char* name, |
| 264 | const char** outName) { |
| 265 | SkASSERT(!fUniformHandles.fRTAdjustmentUni.isValid()); |
| 266 | fUniformHandles.fRTAdjustmentUni = |
| 267 | this->uniformHandler()->addUniform(GrGLSLUniformHandler::kVertex_Visibility, |
| 268 | kVec4f_GrSLType, |
| 269 | precision, |
| 270 | name, |
| 271 | outName); |
| 272 | } |
| 273 | |
| 274 | void GrGLSLProgramBuilder::addRTHeightUniform(const char* name, const char** outName) { |
| 275 | SkASSERT(!fUniformHandles.fRTHeightUni.isValid()); |
| 276 | GrGLSLUniformHandler* uniformHandler = this->uniformHandler(); |
| 277 | fUniformHandles.fRTHeightUni = |
| 278 | uniformHandler->internalAddUniformArray(GrGLSLUniformHandler::kFragment_Visibility, |
| 279 | kFloat_GrSLType, kDefault_GrSLPrecision, |
| 280 | name, false, 0, outName); |
egdaniel | 8dcdedc | 2015-11-11 06:27:20 -0800 | [diff] [blame] | 281 | } |
| 282 | |
egdaniel | fa89632 | 2016-01-13 12:19:30 -0800 | [diff] [blame] | 283 | void GrGLSLProgramBuilder::cleanupFragmentProcessors() { |
| 284 | for (int i = 0; i < fFragmentProcessors.count(); ++i) { |
| 285 | delete fFragmentProcessors[i]; |
| 286 | } |
| 287 | } |
| 288 | |