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/GrGLSLVertexGeoBuilder.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 GrGLSLVarying varying(kHalf4_GrSLType); 86 varyingHandler->addVarying("color", &varying); 87 88 // There are several optional steps to process the color. Start with the attribute: 89 vertBuilder->codeAppendf("half4 color = %s;", gp.inColor()->fName); 90 91 // Linearize 92 if (gp.linearizeColor()) { 93 SkString srgbFuncName; 94 static const GrShaderVar gSrgbArgs[] = { 95 GrShaderVar("x", kHalf_GrSLType), 96 }; 97 vertBuilder->emitFunction(kHalf_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 = half4(%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 = half4(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->writeOutputPosition(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 gp.inLocalCoords()->asShaderVar(), 148 gp.localMatrix(), 149 args.fFPCoordTransformHandler); 150 } else { 151 // emit transforms with position 152 this->emitTransforms(vertBuilder, 153 varyingHandler, 154 uniformHandler, 155 gp.inPosition()->asShaderVar(), 156 gp.localMatrix(), 157 args.fFPCoordTransformHandler); 158 } 159 160 // Setup coverage as pass through 161 if (gp.hasVertexCoverage()) { 162 fragBuilder->codeAppendf("half alpha = 1.0;"); 163 varyingHandler->addPassThroughAttribute(gp.inCoverage(), "alpha"); 164 fragBuilder->codeAppendf("%s = half4(alpha);", args.fOutputCoverage); 165 } else if (gp.coverage() == 0xff) { 166 fragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage); 167 } else { 168 const char* fragCoverage; 169 fCoverageUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 170 kHalf_GrSLType, 171 "Coverage", 172 &fragCoverage); 173 fragBuilder->codeAppendf("%s = half4(%s);", args.fOutputCoverage, fragCoverage); 174 } 175 } 176 177 static inline void GenKey(const GrGeometryProcessor& gp, 178 const GrShaderCaps&, 179 GrProcessorKeyBuilder* b) { 180 const DefaultGeoProc& def = gp.cast<DefaultGeoProc>(); 181 uint32_t key = def.fFlags; 182 key |= (def.coverage() == 0xff) ? 0x10 : 0; 183 key |= (def.localCoordsWillBeRead() && def.localMatrix().hasPerspective()) ? 0x20 : 0x0; 184 key |= ComputePosKey(def.viewMatrix()) << 20; 185 b->add32(key); 186 if (def.linearizeColor()) { 187 b->add32(GrColorSpaceXform::XformKey(def.fColorSpaceXform.get())); 188 } 189 } 190 191 void setData(const GrGLSLProgramDataManager& pdman, 192 const GrPrimitiveProcessor& gp, 193 FPCoordTransformIter&& transformIter) override { 194 const DefaultGeoProc& dgp = gp.cast<DefaultGeoProc>(); 195 196 if (!dgp.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(dgp.viewMatrix())) { 197 fViewMatrix = dgp.viewMatrix(); 198 float viewMatrix[3 * 3]; 199 GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix); 200 pdman.setMatrix3f(fViewMatrixUniform, viewMatrix); 201 } 202 203 if (dgp.color() != fColor && !dgp.hasVertexColor()) { 204 float c[4]; 205 GrColorToRGBAFloat(dgp.color(), c); 206 pdman.set4fv(fColorUniform, 1, c); 207 fColor = dgp.color(); 208 } 209 210 if (dgp.coverage() != fCoverage && !dgp.hasVertexCoverage()) { 211 pdman.set1f(fCoverageUniform, GrNormalizeByteToFloat(dgp.coverage())); 212 fCoverage = dgp.coverage(); 213 } 214 this->setTransformDataHelper(dgp.fLocalMatrix, pdman, &transformIter); 215 216 if (dgp.linearizeColor() && dgp.fColorSpaceXform) { 217 fColorSpaceHelper.setData(pdman, dgp.fColorSpaceXform.get()); 218 } 219 } 220 221 private: 222 SkMatrix fViewMatrix; 223 GrColor fColor; 224 uint8_t fCoverage; 225 UniformHandle fViewMatrixUniform; 226 UniformHandle fColorUniform; 227 UniformHandle fCoverageUniform; 228 GrGLSLColorSpaceXformHelper fColorSpaceHelper; 229 230 typedef GrGLSLGeometryProcessor INHERITED; 231 }; 232 233 void getGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override { 234 GLSLProcessor::GenKey(*this, caps, b); 235 } 236 237 GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override { 238 return new GLSLProcessor(); 239 } 240 241 private: 242 DefaultGeoProc(uint32_t gpTypeFlags, 243 GrColor color, 244 sk_sp<GrColorSpaceXform> colorSpaceXform, 245 const SkMatrix& viewMatrix, 246 const SkMatrix& localMatrix, 247 uint8_t coverage, 248 bool localCoordsWillBeRead) 249 : INHERITED(kDefaultGeoProc_ClassID) 250 , fColor(color) 251 , fViewMatrix(viewMatrix) 252 , fLocalMatrix(localMatrix) 253 , fCoverage(coverage) 254 , fFlags(gpTypeFlags) 255 , fLocalCoordsWillBeRead(localCoordsWillBeRead) 256 , fColorSpaceXform(std::move(colorSpaceXform)) { 257 fInPosition = &this->addVertexAttrib("inPosition", kFloat2_GrVertexAttribType); 258 if (fFlags & kColorAttribute_GPFlag) { 259 fInColor = &this->addVertexAttrib("inColor", kUByte4_norm_GrVertexAttribType); 260 } 261 if (fFlags & kLocalCoordAttribute_GPFlag) { 262 fInLocalCoords = &this->addVertexAttrib("inLocalCoord", kFloat2_GrVertexAttribType); 263 this->setHasExplicitLocalCoords(); 264 } 265 if (fFlags & kCoverageAttribute_GPFlag) { 266 fInCoverage = &this->addVertexAttrib("inCoverage", kHalf_GrVertexAttribType); 267 } 268 } 269 270 const Attribute* fInPosition = nullptr; 271 const Attribute* fInColor = nullptr; 272 const Attribute* fInLocalCoords = nullptr; 273 const Attribute* fInCoverage = nullptr; 274 GrColor fColor; 275 SkMatrix fViewMatrix; 276 SkMatrix fLocalMatrix; 277 uint8_t fCoverage; 278 uint32_t fFlags; 279 bool fLocalCoordsWillBeRead; 280 sk_sp<GrColorSpaceXform> fColorSpaceXform; 281 282 GR_DECLARE_GEOMETRY_PROCESSOR_TEST 283 284 typedef GrGeometryProcessor INHERITED; 285 }; 286 287 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DefaultGeoProc); 288 289 #if GR_TEST_UTILS 290 sk_sp<GrGeometryProcessor> DefaultGeoProc::TestCreate(GrProcessorTestData* d) { 291 uint32_t flags = 0; 292 if (d->fRandom->nextBool()) { 293 flags |= kColorAttribute_GPFlag; 294 } 295 if (d->fRandom->nextBool()) { 296 flags |= kColorAttributeIsSkColor_GPFlag; 297 } 298 if (d->fRandom->nextBool()) { 299 flags |= kCoverageAttribute_GPFlag; 300 } 301 if (d->fRandom->nextBool()) { 302 flags |= kLocalCoordAttribute_GPFlag; 303 } 304 305 return DefaultGeoProc::Make(flags, 306 GrRandomColor(d->fRandom), 307 GrTest::TestColorXform(d->fRandom), 308 GrTest::TestMatrix(d->fRandom), 309 GrTest::TestMatrix(d->fRandom), 310 d->fRandom->nextBool(), 311 GrRandomCoverage(d->fRandom)); 312 } 313 #endif 314 315 sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::Make(const Color& color, 316 const Coverage& coverage, 317 const LocalCoords& localCoords, 318 const SkMatrix& viewMatrix) { 319 uint32_t flags = 0; 320 if (Color::kPremulGrColorAttribute_Type == color.fType) { 321 flags |= kColorAttribute_GPFlag; 322 } else if (Color::kUnpremulSkColorAttribute_Type == color.fType) { 323 flags |= kColorAttribute_GPFlag | kColorAttributeIsSkColor_GPFlag; 324 } 325 if (color.fLinearize) { 326 // It only makes sense to linearize SkColors (which are always sRGB). GrColor values should 327 // have been linearized and gamut-converted during paint conversion 328 SkASSERT(Color::kUnpremulSkColorAttribute_Type == color.fType); 329 flags |= kLinearizeColorAttribute_GPFlag; 330 } 331 flags |= coverage.fType == Coverage::kAttribute_Type ? kCoverageAttribute_GPFlag : 0; 332 flags |= localCoords.fType == LocalCoords::kHasExplicit_Type ? kLocalCoordAttribute_GPFlag : 0; 333 334 uint8_t inCoverage = coverage.fCoverage; 335 bool localCoordsWillBeRead = localCoords.fType != LocalCoords::kUnused_Type; 336 337 GrColor inColor = color.fColor; 338 return DefaultGeoProc::Make(flags, 339 inColor, 340 color.fColorSpaceXform, 341 viewMatrix, 342 localCoords.fMatrix ? *localCoords.fMatrix : SkMatrix::I(), 343 localCoordsWillBeRead, 344 inCoverage); 345 } 346 347 sk_sp<GrGeometryProcessor> GrDefaultGeoProcFactory::MakeForDeviceSpace( 348 const Color& color, 349 const Coverage& coverage, 350 const LocalCoords& localCoords, 351 const SkMatrix& viewMatrix) { 352 SkMatrix invert = SkMatrix::I(); 353 if (LocalCoords::kUnused_Type != localCoords.fType) { 354 SkASSERT(LocalCoords::kUsePosition_Type == localCoords.fType); 355 if (!viewMatrix.isIdentity() && !viewMatrix.invert(&invert)) { 356 return nullptr; 357 } 358 359 if (localCoords.hasLocalMatrix()) { 360 invert.preConcat(*localCoords.fMatrix); 361 } 362 } 363 364 LocalCoords inverted(LocalCoords::kUsePosition_Type, &invert); 365 return Make(color, coverage, inverted, SkMatrix::I()); 366 } 367
