1 /* 2 * Copyright 2014 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 "GrDefaultGeoProcFactory.h" 9 10 #include "SkRefCnt.h" 11 #include "glsl/GrGLSLColorSpaceXformHelper.h" 12 #include "glsl/GrGLSLFragmentShaderBuilder.h" 13 #include "glsl/GrGLSLGeometryProcessor.h" 14 #include "glsl/GrGLSLVertexShaderBuilder.h" 15 #include "glsl/GrGLSLVarying.h" 16 #include "glsl/GrGLSLUniformHandler.h" 17 #include "glsl/GrGLSLUtil.h" 18 19 /* 20 * The default Geometry Processor simply takes position and multiplies it by the uniform view 21 * matrix. It also leaves coverage untouched. Behind the scenes, we may add per vertex color or 22 * local coords. 23 */ 24 25 enum GPFlag { 26 kColorAttribute_GPFlag = 0x1, 27 kColorAttributeIsSkColor_GPFlag = 0x2, 28 kLocalCoordAttribute_GPFlag = 0x4, 29 kCoverageAttribute_GPFlag = 0x8, 30 31 kLinearizeColorAttribute_GPFlag = 0x10, 32 }; 33 34 class DefaultGeoProc : public GrGeometryProcessor { 35 public: 36 static sk_sp<GrGeometryProcessor> Make(uint32_t gpTypeFlags, 37 GrColor color, 38 sk_sp<GrColorSpaceXform> colorSpaceXform, 39 const SkMatrix& viewMatrix, 40 const SkMatrix& localMatrix, 41 bool localCoordsWillBeRead, 42 uint8_t coverage) { 43 return sk_sp<GrGeometryProcessor>(new DefaultGeoProc( 44 gpTypeFlags, color, std::move(colorSpaceXform), viewMatrix, localMatrix, coverage, 45 localCoordsWillBeRead)); 46 } 47 48 const char* name() const override { return "DefaultGeometryProcessor"; } 49 50 const Attribute* inPosition() const { return fInPosition; } 51 const Attribute* inColor() const { return fInColor; } 52 const Attribute* inLocalCoords() const { return fInLocalCoords; } 53 const Attribute* inCoverage() const { return fInCoverage; } 54 GrColor color() const { return fColor; } 55 bool hasVertexColor() const { return SkToBool(fInColor); } 56 const SkMatrix& viewMatrix() const { return fViewMatrix; } 57 const SkMatrix& localMatrix() const { return fLocalMatrix; } 58 bool localCoordsWillBeRead() const { return fLocalCoordsWillBeRead; } 59 uint8_t coverage() const { return fCoverage; } 60 bool hasVertexCoverage() const { return SkToBool(fInCoverage); } 61 bool linearizeColor() const { 62 // Linearization should only happen with SkColor 63 bool linearize = SkToBool(fFlags & kLinearizeColorAttribute_GPFlag); 64 SkASSERT(!linearize || (fFlags & kColorAttributeIsSkColor_GPFlag)); 65 return linearize; 66 } 67 68 class GLSLProcessor : public GrGLSLGeometryProcessor { 69 public: 70 GLSLProcessor() 71 : fViewMatrix(SkMatrix::InvalidMatrix()), fColor(GrColor_ILLEGAL), fCoverage(0xff) {} 72 73 void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override { 74 const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>(); 75 GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; 76 GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; 77 GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; 78 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; 79 80 // emit attributes 81 varyingHandler->emitAttributes(gp); 82 83 // Setup pass through color 84 if (gp.hasVertexColor()) { 85 GrGLSLVertToFrag varying(kVec4f_GrSLType); 86 varyingHandler->addVarying("color", &varying); 87 88 // There are several optional steps to process the color. Start with the attribute: 89 vertBuilder->codeAppendf("vec4 color = %s;", gp.inColor()->fName); 90 91 // Linearize 92 if (gp.linearizeColor()) { 93 SkString srgbFuncName; 94 static const GrShaderVar gSrgbArgs[] = { 95 GrShaderVar("x", kFloat_GrSLType), 96 }; 97 vertBuilder->emitFunction(kFloat_GrSLType, 98 "srgb_to_linear", 99 SK_ARRAY_COUNT(gSrgbArgs), 100 gSrgbArgs, 101 "return (x <= 0.04045) ? (x / 12.92) " 102 ": pow((x + 0.055) / 1.055, 2.4);", 103 &srgbFuncName); 104 vertBuilder->codeAppendf("color = vec4(%s(%s.r), %s(%s.g), %s(%s.b), %s.a);", 105 srgbFuncName.c_str(), gp.inColor()->fName, 106 srgbFuncName.c_str(), gp.inColor()->fName, 107 srgbFuncName.c_str(), gp.inColor()->fName, 108 gp.inColor()->fName); 109 } 110 111 // For SkColor, do a red/blue swap and premul 112 if (gp.fFlags & kColorAttributeIsSkColor_GPFlag) { 113 vertBuilder->codeAppend("color = vec4(color.a * color.bgr, color.a);"); 114 } 115 116 // Do color-correction to destination gamut 117 if (gp.linearizeColor()) { 118 fColorSpaceHelper.emitCode(uniformHandler, gp.fColorSpaceXform.get(), 119 kVertex_GrShaderFlag); 120 if (fColorSpaceHelper.isValid()) { 121 SkString xformedColor; 122 vertBuilder->appendColorGamutXform(&xformedColor, "color", 123 &fColorSpaceHelper); 124 vertBuilder->codeAppendf("color = %s;", xformedColor.c_str()); 125 } 126 } 127 vertBuilder->codeAppendf("%s = color;\n", varying.vsOut()); 128 fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, varying.fsIn()); 129 } else { 130 this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor, 131 &fColorUniform); 132 } 133 134 // Setup position 135 this->setupPosition(vertBuilder, 136 uniformHandler, 137 gpArgs, 138 gp.inPosition()->fName, 139 gp.viewMatrix(), 140 &fViewMatrixUniform); 141 142 if (gp.hasExplicitLocalCoords()) { 143 // emit transforms with explicit local coords 144 this->emitTransforms(vertBuilder, 145 varyingHandler, 146 uniformHandler, 147 gpArgs->fPositionVar, 148 gp.inLocalCoords()->fName, 149 gp.localMatrix(), 150 args.fFPCoordTransformHandler); 151 } else { 152 // emit transforms with position 153 this->emitTransforms(vertBuilder, 154 varyingHandler, 155 uniformHandler, 156 gpArgs->fPositionVar, 157 gp.inPosition()->fName, 158 gp.localMatrix(), 159 args.fFPCoordTransformHandler); 160 } 161 162 // Setup coverage as pass through 163 if (gp.hasVertexCoverage()) { 164 fragBuilder->codeAppendf("float alpha = 1.0;"); 165 varyingHandler->addPassThroughAttribute(gp.inCoverage(), "alpha"); 166 fragBuilder->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage); 167 } else if (gp.coverage() == 0xff) { 168 fragBuilder->codeAppendf("%s = vec4(1);", args.fOutputCoverage); 169 } else { 170 const char* fragCoverage; 171 fCoverageUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 172 kFloat_GrSLType, 173 kDefault_GrSLPrecision, 174 "Coverage", 175 &fragCoverage); 176 fragBuilder->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, fragCoverage); 177 } 178 } 179 180 static inline void GenKey(const GrGeometryProcessor& gp, 181 const GrShaderCaps&, 182 GrProcessorKeyBuilder* b) { 183 const DefaultGeoProc& def = gp.cast<DefaultGeoProc>(); 184 uint32_t key = def.fFlags; 185 key |= (def.coverage() == 0xff) ? 0x10 : 0; 186 key |= (def.localCoordsWillBeRead() && def.localMatrix().hasPerspective()) ? 0x20 : 0x0; 187 key |= ComputePosKey(def.viewMatrix()) << 20; 188 b->add32(key); 189 if (def.linearizeColor()) { 190 b->add32(GrColorSpaceXform::XformKey(def.fColorSpaceXform.get())); 191 } 192 } 193 194 void setData(const GrGLSLProgramDataManager& pdman, 195 const GrPrimitiveProcessor& gp, 196 FPCoordTransformIter&& transformIter) override { 197 const DefaultGeoProc& dgp = gp.cast<DefaultGeoProc>(); 198 199 if (!dgp.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(dgp.viewMatrix())) { 200 fViewMatrix = dgp.viewMatrix(); 201 float viewMatrix[3 * 3]; 202 GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix); 203 pdman.setMatrix3f(fViewMatrixUniform, viewMatrix); 204 } 205 206 if (dgp.color() != fColor && !dgp.hasVertexColor()) { 207 float c[4]; 208 GrColorToRGBAFloat(dgp.color(), c); 209 pdman.set4fv(fColorUniform, 1, c); 210 fColor = dgp.color(); 211 } 212 213 if (dgp.coverage() != fCoverage && !dgp.hasVertexCoverage()) { 214 pdman.set1f(fCoverageUniform, GrNormalizeByteToFloat(dgp.coverage())); 215 fCoverage = dgp.coverage(); 216 } 217 this->setTransformDataHelper(dgp.fLocalMatrix, pdman, &transformIter); 218 219 if (dgp.linearizeColor() && dgp.fColorSpaceXform) { 220 fColorSpaceHelper.setData(pdman, dgp.fColorSpaceXform.get()); 221 } 222 } 223 224 private: 225 SkMatrix fViewMatrix; 226 GrColor fColor; 227 uint8_t fCoverage; 228 UniformHandle fViewMatrixUniform; 229 UniformHandle fColorUniform; 230 UniformHandle fCoverageUniform; 231 GrGLSLColorSpaceXformHelper fColorSpaceHelper; 232 233 typedef GrGLSLGeometryProcessor INHERITED; 234 }; 235 236 void getGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override { 237 GLSLProcessor::GenKey(*this, caps, b); 238 } 239 240 GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override { 241 return new GLSLProcessor(); 242 } 243 244 private: 245 DefaultGeoProc(uint32_t gpTypeFlags, 246 GrColor color, 247 sk_sp<GrColorSpaceXform> colorSpaceXform, 248 const SkMatrix& viewMatrix, 249 const SkMatrix& localMatrix, 250 uint8_t coverage, 251 bool localCoordsWillBeRead) 252 : fColor(color) 253 , fViewMatrix(viewMatrix) 254 , fLocalMatrix(localMatrix) 255 , fCoverage(coverage) 256 , fFlags(gpTypeFlags) 257 , fLocalCoordsWillBeRead(localCoordsWillBeRead) 258 , fColorSpaceXform(std::move(colorSpaceXform)) { 259 this->initClassID<DefaultGeoProc>(); 260 fInPosition = &this->addVertexAttrib("inPosition", kVec2f_GrVertexAttribType, 261 kHigh_GrSLPrecision); 262 if (fFlags & kColorAttribute_GPFlag) { 263 fInColor = &this->addVertexAttrib("inColor", kVec4ub_GrVertexAttribType); 264 } 265 if (fFlags & kLocalCoordAttribute_GPFlag) { 266 fInLocalCoords = &this->addVertexAttrib("inLocalCoord", kVec2f_GrVertexAttribType, 267 kHigh_GrSLPrecision); 268 this->setHasExplicitLocalCoords(); 269 } 270 if (fFlags & kCoverageAttribute_GPFlag) { 271 fInCoverage = &this->addVertexAttrib("inCoverage", kFloat_GrVertexAttribType); 272 } 273 } 274 275 const Attribute* fInPosition = nullptr; 276 const Attribute* fInColor = nullptr; 277 const Attribute* fInLocalCoords = nullptr; 278 const Attribute* fInCoverage = nullptr; 279 GrColor fColor; 280 SkMatrix fViewMatrix; 281 SkMatrix fLocalMatrix; 282 uint8_t fCoverage; 283 uint32_t fFlags; 284 bool fLocalCoordsWillBeRead; 285 sk_sp<GrColorSpaceXform> fColorSpaceXform; 286 287 GR_DECLARE_GEOMETRY_PROCESSOR_TEST 288 289 typedef GrGeometryProcessor INHERITED; 290 }; 291 292 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DefaultGeoProc); 293 294 #if GR_TEST_UTILS 295 sk_sp<GrGeometryProcessor> DefaultGeoProc::TestCreate(GrProcessorTestData* d) { 296 uint32_t flags = 0; 297 if (d->fRandom->nextBool()) { 298 flags |= kColorAttribute_GPFlag; 299 } 300 if (d->fRandom->nextBool()) { 301 flags |= kColorAttributeIsSkColor_GPFlag; 302 } 303 if (d->fRandom->nextBool()) { 304 flags |= kCoverageAttribute_GPFlag; 305 } 306 if (d->fRandom->nextBool()) { 307 flags |= kLocalCoordAttribute_GPFlag; 308 } 309 310 return DefaultGeoProc::Make(flags, 311 GrRandomColor(d->fRandom), 312 GrTest::TestColorXform(d->fRandom), 313 GrTest::TestMatrix(d->fRandom), 314 GrTest::TestMatrix(d->fRandom), 315 d->fRandom->nextBool(), 316 GrRandomCoverage(d->fRandom)); 317 } 318 #endif 319 320 sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::Make(const Color& color, 321 const Coverage& coverage, 322 const LocalCoords& localCoords, 323 const SkMatrix& viewMatrix) { 324 uint32_t flags = 0; 325 if (Color::kPremulGrColorAttribute_Type == color.fType) { 326 flags |= kColorAttribute_GPFlag; 327 } else if (Color::kUnpremulSkColorAttribute_Type == color.fType) { 328 flags |= kColorAttribute_GPFlag | kColorAttributeIsSkColor_GPFlag; 329 } 330 if (color.fLinearize) { 331 // It only makes sense to linearize SkColors (which are always sRGB). GrColor values should 332 // have been linearized and gamut-converted during paint conversion 333 SkASSERT(Color::kUnpremulSkColorAttribute_Type == color.fType); 334 flags |= kLinearizeColorAttribute_GPFlag; 335 } 336 flags |= coverage.fType == Coverage::kAttribute_Type ? kCoverageAttribute_GPFlag : 0; 337 flags |= localCoords.fType == LocalCoords::kHasExplicit_Type ? kLocalCoordAttribute_GPFlag : 0; 338 339 uint8_t inCoverage = coverage.fCoverage; 340 bool localCoordsWillBeRead = localCoords.fType != LocalCoords::kUnused_Type; 341 342 GrColor inColor = color.fColor; 343 return DefaultGeoProc::Make(flags, 344 inColor, 345 color.fColorSpaceXform, 346 viewMatrix, 347 localCoords.fMatrix ? *localCoords.fMatrix : SkMatrix::I(), 348 localCoordsWillBeRead, 349 inCoverage); 350 } 351 352 sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::MakeForDeviceSpace( 353 const Color& color, 354 const Coverage& coverage, 355 const LocalCoords& localCoords, 356 const SkMatrix& viewMatrix) { 357 SkMatrix invert = SkMatrix::I(); 358 if (LocalCoords::kUnused_Type != localCoords.fType) { 359 SkASSERT(LocalCoords::kUsePosition_Type == localCoords.fType); 360 if (!viewMatrix.isIdentity() && !viewMatrix.invert(&invert)) { 361 return nullptr; 362 } 363 364 if (localCoords.hasLocalMatrix()) { 365 invert.preConcat(*localCoords.fMatrix); 366 } 367 } 368 369 LocalCoords inverted(LocalCoords::kUsePosition_Type, &invert); 370 return Make(color, coverage, inverted, SkMatrix::I()); 371 } 372
