Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [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 | |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 8 | #include "include/core/SkColor.h" |
| 9 | #include "include/core/SkPoint3.h" |
| 10 | #include "include/core/SkUnPreMultiply.h" |
Ben Wagner | 729a23f | 2019-05-17 16:29:34 -0400 | [diff] [blame] | 11 | #include "src/core/SkArenaAlloc.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 12 | #include "src/core/SkBitmapProcState.h" |
| 13 | #include "src/core/SkMathPriv.h" |
| 14 | #include "src/core/SkNormalSource.h" |
| 15 | #include "src/core/SkReadBuffer.h" |
| 16 | #include "src/core/SkWriteBuffer.h" |
| 17 | #include "src/shaders/SkBitmapProcShader.h" |
| 18 | #include "src/shaders/SkEmptyShader.h" |
| 19 | #include "src/shaders/SkLightingShader.h" |
| 20 | #include "src/shaders/SkShaderBase.h" |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 21 | |
| 22 | //////////////////////////////////////////////////////////////////////////// |
| 23 | |
| 24 | /* |
| 25 | SkLightingShader TODOs: |
| 26 | support different light types |
| 27 | support multiple lights |
| 28 | fix non-opaque diffuse textures |
| 29 | |
| 30 | To Test: |
| 31 | A8 diffuse textures |
| 32 | down & upsampled draws |
| 33 | */ |
| 34 | |
| 35 | |
| 36 | |
| 37 | /** \class SkLightingShaderImpl |
| 38 | This subclass of shader applies lighting. |
| 39 | */ |
| 40 | class SkLightingShaderImpl : public SkShaderBase { |
| 41 | public: |
| 42 | /** Create a new lighting shader that uses the provided normal map and |
| 43 | lights to light the diffuse bitmap. |
| 44 | @param diffuseShader the shader that provides the diffuse colors |
| 45 | @param normalSource the source of normals for lighting computation |
| 46 | @param lights the lights applied to the geometry |
| 47 | */ |
| 48 | SkLightingShaderImpl(sk_sp<SkShader> diffuseShader, |
| 49 | sk_sp<SkNormalSource> normalSource, |
| 50 | sk_sp<SkLights> lights) |
| 51 | : fDiffuseShader(std::move(diffuseShader)) |
| 52 | , fNormalSource(std::move(normalSource)) |
| 53 | , fLights(std::move(lights)) {} |
| 54 | |
| 55 | bool isOpaque() const override; |
| 56 | |
| 57 | #if SK_SUPPORT_GPU |
| 58 | std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override; |
| 59 | #endif |
| 60 | |
| 61 | class LightingShaderContext : public Context { |
| 62 | public: |
| 63 | // The context takes ownership of the context and provider. It will call their destructors |
| 64 | // and then indirectly free their memory by calling free() on heapAllocated |
| 65 | LightingShaderContext(const SkLightingShaderImpl&, const ContextRec&, |
| 66 | SkShaderBase::Context* diffuseContext, SkNormalSource::Provider*, |
| 67 | void* heapAllocated); |
| 68 | |
| 69 | void shadeSpan(int x, int y, SkPMColor[], int count) override; |
| 70 | |
| 71 | uint32_t getFlags() const override { return fFlags; } |
| 72 | |
| 73 | private: |
| 74 | SkShaderBase::Context* fDiffuseContext; |
| 75 | SkNormalSource::Provider* fNormalProvider; |
| 76 | SkColor fPaintColor; |
| 77 | uint32_t fFlags; |
| 78 | |
| 79 | typedef Context INHERITED; |
| 80 | }; |
| 81 | |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 82 | protected: |
| 83 | void flatten(SkWriteBuffer&) const override; |
Mike Reed | e92aae6 | 2018-10-17 10:21:51 -0400 | [diff] [blame] | 84 | #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 85 | Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override; |
Mike Reed | e92aae6 | 2018-10-17 10:21:51 -0400 | [diff] [blame] | 86 | #endif |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 87 | |
| 88 | private: |
Mike Klein | 4fee323 | 2018-10-18 17:27:16 -0400 | [diff] [blame] | 89 | SK_FLATTENABLE_HOOKS(SkLightingShaderImpl) |
| 90 | |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 91 | sk_sp<SkShader> fDiffuseShader; |
| 92 | sk_sp<SkNormalSource> fNormalSource; |
| 93 | sk_sp<SkLights> fLights; |
| 94 | |
| 95 | friend class SkLightingShader; |
| 96 | |
| 97 | typedef SkShaderBase INHERITED; |
| 98 | }; |
| 99 | |
| 100 | //////////////////////////////////////////////////////////////////////////// |
| 101 | |
| 102 | #if SK_SUPPORT_GPU |
| 103 | |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 104 | #include "src/gpu/GrCoordTransform.h" |
| 105 | #include "src/gpu/GrFragmentProcessor.h" |
| 106 | #include "src/gpu/SkGr.h" |
| 107 | #include "src/gpu/glsl/GrGLSLFragmentProcessor.h" |
| 108 | #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h" |
| 109 | #include "src/gpu/glsl/GrGLSLProgramDataManager.h" |
| 110 | #include "src/gpu/glsl/GrGLSLUniformHandler.h" |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 111 | |
| 112 | // This FP expects a premul'd color input for its diffuse color. Premul'ing of the paint's color is |
| 113 | // handled by the asFragmentProcessor() factory, but shaders providing diffuse color must output it |
| 114 | // premul'd. |
| 115 | class LightingFP : public GrFragmentProcessor { |
| 116 | public: |
| 117 | static std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> normalFP, |
| 118 | sk_sp<SkLights> lights) { |
| 119 | return std::unique_ptr<GrFragmentProcessor>(new LightingFP(std::move(normalFP), |
| 120 | std::move(lights))); |
| 121 | } |
| 122 | |
| 123 | const char* name() const override { return "LightingFP"; } |
| 124 | |
| 125 | std::unique_ptr<GrFragmentProcessor> clone() const override { |
| 126 | return std::unique_ptr<GrFragmentProcessor>(new LightingFP(*this)); |
| 127 | } |
| 128 | |
| 129 | const SkTArray<SkLights::Light>& directionalLights() const { return fDirectionalLights; } |
| 130 | const SkColor3f& ambientColor() const { return fAmbientColor; } |
| 131 | |
| 132 | private: |
| 133 | class GLSLLightingFP : public GrGLSLFragmentProcessor { |
| 134 | public: |
| 135 | GLSLLightingFP() { |
| 136 | fAmbientColor.fX = 0.0f; |
| 137 | } |
| 138 | |
| 139 | void emitCode(EmitArgs& args) override { |
| 140 | |
| 141 | GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder; |
| 142 | GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| 143 | const LightingFP& lightingFP = args.fFp.cast<LightingFP>(); |
| 144 | |
| 145 | const char *lightDirsUniName = nullptr; |
| 146 | const char *lightColorsUniName = nullptr; |
| 147 | if (lightingFP.fDirectionalLights.count() != 0) { |
| 148 | fLightDirsUni = uniformHandler->addUniformArray( |
| 149 | kFragment_GrShaderFlag, |
| 150 | kFloat3_GrSLType, |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 151 | "LightDir", |
| 152 | lightingFP.fDirectionalLights.count(), |
| 153 | &lightDirsUniName); |
| 154 | fLightColorsUni = uniformHandler->addUniformArray( |
| 155 | kFragment_GrShaderFlag, |
| 156 | kFloat3_GrSLType, |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 157 | "LightColor", |
| 158 | lightingFP.fDirectionalLights.count(), |
| 159 | &lightColorsUniName); |
| 160 | } |
| 161 | |
| 162 | const char* ambientColorUniName = nullptr; |
Ethan Nicholas | 858fecc | 2019-03-07 13:19:18 -0500 | [diff] [blame] | 163 | fAmbientColorUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kFloat3_GrSLType, |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 164 | "AmbientColor", &ambientColorUniName); |
| 165 | |
Ethan Nicholas | e1f5502 | 2019-02-05 17:17:40 -0500 | [diff] [blame] | 166 | fragBuilder->codeAppendf("half4 diffuseColor = %s;", args.fInputColor); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 167 | |
Ethan Nicholas | 6ad5289 | 2019-05-03 13:13:42 +0000 | [diff] [blame] | 168 | SkString dstNormalName("dstNormal"); |
Ethan Nicholas | c6dce5a | 2019-07-24 16:51:36 -0400 | [diff] [blame] | 169 | this->invokeChild(0, &dstNormalName, args); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 170 | |
Ethan Nicholas | 6ad5289 | 2019-05-03 13:13:42 +0000 | [diff] [blame] | 171 | fragBuilder->codeAppendf("float3 normal = %s.xyz;", dstNormalName.c_str()); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 172 | |
Ethan Nicholas | e1f5502 | 2019-02-05 17:17:40 -0500 | [diff] [blame] | 173 | fragBuilder->codeAppend( "half3 result = half3(0.0);"); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 174 | |
| 175 | // diffuse light |
| 176 | if (lightingFP.fDirectionalLights.count() != 0) { |
| 177 | fragBuilder->codeAppendf("for (int i = 0; i < %d; i++) {", |
| 178 | lightingFP.fDirectionalLights.count()); |
| 179 | // TODO: modulate the contribution from each light based on the shadow map |
Ethan Nicholas | e1f5502 | 2019-02-05 17:17:40 -0500 | [diff] [blame] | 180 | fragBuilder->codeAppendf(" half NdotL = saturate(half(dot(normal, %s[i])));", |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 181 | lightDirsUniName); |
Ethan Nicholas | e1f5502 | 2019-02-05 17:17:40 -0500 | [diff] [blame] | 182 | fragBuilder->codeAppendf(" result += half3(%s[i])*diffuseColor.rgb*NdotL;", |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 183 | lightColorsUniName); |
| 184 | fragBuilder->codeAppend("}"); |
| 185 | } |
| 186 | |
| 187 | // ambient light |
Ethan Nicholas | e1f5502 | 2019-02-05 17:17:40 -0500 | [diff] [blame] | 188 | fragBuilder->codeAppendf("result += half3(%s) * diffuseColor.rgb;", |
| 189 | ambientColorUniName); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 190 | |
| 191 | // Clamping to alpha (equivalent to an unpremul'd clamp to 1.0) |
Ethan Nicholas | e1f5502 | 2019-02-05 17:17:40 -0500 | [diff] [blame] | 192 | fragBuilder->codeAppendf("%s = half4(clamp(result.rgb, 0.0, diffuseColor.a), " |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 193 | "diffuseColor.a);", args.fOutputColor); |
| 194 | } |
| 195 | |
| 196 | static void GenKey(const GrProcessor& proc, const GrShaderCaps&, GrProcessorKeyBuilder* b) { |
| 197 | const LightingFP& lightingFP = proc.cast<LightingFP>(); |
| 198 | b->add32(lightingFP.fDirectionalLights.count()); |
| 199 | } |
| 200 | |
| 201 | protected: |
| 202 | void onSetData(const GrGLSLProgramDataManager& pdman, |
| 203 | const GrFragmentProcessor& proc) override { |
| 204 | const LightingFP& lightingFP = proc.cast<LightingFP>(); |
| 205 | |
| 206 | const SkTArray<SkLights::Light>& directionalLights = lightingFP.directionalLights(); |
| 207 | if (directionalLights != fDirectionalLights) { |
| 208 | SkTArray<SkColor3f> lightDirs(directionalLights.count()); |
| 209 | SkTArray<SkVector3> lightColors(directionalLights.count()); |
| 210 | for (const SkLights::Light& light : directionalLights) { |
| 211 | lightDirs.push_back(light.dir()); |
| 212 | lightColors.push_back(light.color()); |
| 213 | } |
| 214 | |
| 215 | pdman.set3fv(fLightDirsUni, directionalLights.count(), &(lightDirs[0].fX)); |
| 216 | pdman.set3fv(fLightColorsUni, directionalLights.count(), &(lightColors[0].fX)); |
| 217 | |
| 218 | fDirectionalLights = directionalLights; |
| 219 | } |
| 220 | |
| 221 | const SkColor3f& ambientColor = lightingFP.ambientColor(); |
| 222 | if (ambientColor != fAmbientColor) { |
| 223 | pdman.set3fv(fAmbientColorUni, 1, &ambientColor.fX); |
| 224 | fAmbientColor = ambientColor; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | private: |
| 229 | SkTArray<SkLights::Light> fDirectionalLights; |
| 230 | GrGLSLProgramDataManager::UniformHandle fLightDirsUni; |
| 231 | GrGLSLProgramDataManager::UniformHandle fLightColorsUni; |
| 232 | |
| 233 | SkColor3f fAmbientColor; |
| 234 | GrGLSLProgramDataManager::UniformHandle fAmbientColorUni; |
| 235 | }; |
| 236 | |
| 237 | void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override { |
| 238 | GLSLLightingFP::GenKey(*this, caps, b); |
| 239 | } |
| 240 | |
| 241 | LightingFP(std::unique_ptr<GrFragmentProcessor> normalFP, sk_sp<SkLights> lights) |
| 242 | : INHERITED(kLightingFP_ClassID, kPreservesOpaqueInput_OptimizationFlag) { |
| 243 | // fuse all ambient lights into a single one |
| 244 | fAmbientColor = lights->ambientLightColor(); |
| 245 | for (int i = 0; i < lights->numLights(); ++i) { |
| 246 | if (SkLights::Light::kDirectional_LightType == lights->light(i).type()) { |
| 247 | fDirectionalLights.push_back(lights->light(i)); |
| 248 | // TODO get the handle to the shadow map if there is one |
| 249 | } else { |
| 250 | SkDEBUGFAIL("Unimplemented Light Type passed to LightingFP"); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | this->registerChildProcessor(std::move(normalFP)); |
| 255 | } |
| 256 | |
| 257 | LightingFP(const LightingFP& that) |
| 258 | : INHERITED(kLightingFP_ClassID, kPreservesOpaqueInput_OptimizationFlag) |
| 259 | , fDirectionalLights(that.fDirectionalLights) |
| 260 | , fAmbientColor(that.fAmbientColor) { |
| 261 | this->registerChildProcessor(that.childProcessor(0).clone()); |
| 262 | } |
| 263 | |
| 264 | GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new GLSLLightingFP; } |
| 265 | |
| 266 | bool onIsEqual(const GrFragmentProcessor& proc) const override { |
| 267 | const LightingFP& lightingFP = proc.cast<LightingFP>(); |
| 268 | return fDirectionalLights == lightingFP.fDirectionalLights && |
| 269 | fAmbientColor == lightingFP.fAmbientColor; |
| 270 | } |
| 271 | |
| 272 | SkTArray<SkLights::Light> fDirectionalLights; |
| 273 | SkColor3f fAmbientColor; |
| 274 | |
| 275 | typedef GrFragmentProcessor INHERITED; |
| 276 | }; |
| 277 | |
| 278 | //////////////////////////////////////////////////////////////////////////// |
| 279 | |
| 280 | std::unique_ptr<GrFragmentProcessor> SkLightingShaderImpl::asFragmentProcessor(const GrFPArgs& args) const { |
| 281 | std::unique_ptr<GrFragmentProcessor> normalFP(fNormalSource->asFragmentProcessor(args)); |
| 282 | if (!normalFP) { |
| 283 | return nullptr; |
| 284 | } |
| 285 | |
| 286 | if (fDiffuseShader) { |
| 287 | std::unique_ptr<GrFragmentProcessor> fpPipeline[] = { |
| 288 | as_SB(fDiffuseShader)->asFragmentProcessor(args), |
| 289 | LightingFP::Make(std::move(normalFP), fLights) |
| 290 | }; |
| 291 | if (!fpPipeline[0] || !fpPipeline[1]) { |
| 292 | return nullptr; |
| 293 | } |
| 294 | |
| 295 | std::unique_ptr<GrFragmentProcessor> innerLightFP = GrFragmentProcessor::RunInSeries(fpPipeline, 2); |
| 296 | // FP is wrapped because paint's alpha needs to be applied to output |
| 297 | return GrFragmentProcessor::MulChildByInputAlpha(std::move(innerLightFP)); |
| 298 | } else { |
| 299 | // FP is wrapped because paint comes in unpremul'd to fragment shader, but LightingFP |
| 300 | // expects premul'd color. |
| 301 | return GrFragmentProcessor::PremulInput(LightingFP::Make(std::move(normalFP), fLights)); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | #endif |
| 306 | |
| 307 | //////////////////////////////////////////////////////////////////////////// |
| 308 | |
| 309 | bool SkLightingShaderImpl::isOpaque() const { |
| 310 | return (fDiffuseShader ? fDiffuseShader->isOpaque() : false); |
| 311 | } |
| 312 | |
| 313 | SkLightingShaderImpl::LightingShaderContext::LightingShaderContext( |
| 314 | const SkLightingShaderImpl& shader, const ContextRec& rec, |
| 315 | SkShaderBase::Context* diffuseContext, SkNormalSource::Provider* normalProvider, |
| 316 | void* heapAllocated) |
| 317 | : INHERITED(shader, rec) |
| 318 | , fDiffuseContext(diffuseContext) |
| 319 | , fNormalProvider(normalProvider) { |
| 320 | bool isOpaque = shader.isOpaque(); |
| 321 | |
| 322 | // update fFlags |
| 323 | uint32_t flags = 0; |
| 324 | if (isOpaque && (255 == this->getPaintAlpha())) { |
| 325 | flags |= kOpaqueAlpha_Flag; |
| 326 | } |
| 327 | |
| 328 | fPaintColor = rec.fPaint->getColor(); |
| 329 | fFlags = flags; |
| 330 | } |
| 331 | |
| 332 | static inline SkPMColor convert(SkColor3f color, U8CPU a) { |
| 333 | if (color.fX <= 0.0f) { |
| 334 | color.fX = 0.0f; |
| 335 | } else if (color.fX >= 255.0f) { |
| 336 | color.fX = 255.0f; |
| 337 | } |
| 338 | |
| 339 | if (color.fY <= 0.0f) { |
| 340 | color.fY = 0.0f; |
| 341 | } else if (color.fY >= 255.0f) { |
| 342 | color.fY = 255.0f; |
| 343 | } |
| 344 | |
| 345 | if (color.fZ <= 0.0f) { |
| 346 | color.fZ = 0.0f; |
| 347 | } else if (color.fZ >= 255.0f) { |
| 348 | color.fZ = 255.0f; |
| 349 | } |
| 350 | |
| 351 | return SkPreMultiplyARGB(a, (int) color.fX, (int) color.fY, (int) color.fZ); |
| 352 | } |
| 353 | |
| 354 | // larger is better (fewer times we have to loop), but we shouldn't |
| 355 | // take up too much stack-space (each one here costs 16 bytes) |
| 356 | #define BUFFER_MAX 16 |
| 357 | void SkLightingShaderImpl::LightingShaderContext::shadeSpan(int x, int y, |
| 358 | SkPMColor result[], int count) { |
| 359 | const SkLightingShaderImpl& lightShader = static_cast<const SkLightingShaderImpl&>(fShader); |
| 360 | |
| 361 | SkPMColor diffuse[BUFFER_MAX]; |
| 362 | SkPoint3 normals[BUFFER_MAX]; |
| 363 | |
| 364 | SkColor diffColor = fPaintColor; |
| 365 | |
| 366 | do { |
| 367 | int n = SkTMin(count, BUFFER_MAX); |
| 368 | |
| 369 | fNormalProvider->fillScanLine(x, y, normals, n); |
| 370 | |
| 371 | if (fDiffuseContext) { |
| 372 | fDiffuseContext->shadeSpan(x, y, diffuse, n); |
| 373 | } |
| 374 | |
| 375 | for (int i = 0; i < n; ++i) { |
| 376 | if (fDiffuseContext) { |
| 377 | diffColor = SkUnPreMultiply::PMColorToColor(diffuse[i]); |
| 378 | } |
| 379 | |
| 380 | SkColor3f accum = SkColor3f::Make(0.0f, 0.0f, 0.0f); |
| 381 | |
| 382 | // Adding ambient light |
| 383 | accum.fX += lightShader.fLights->ambientLightColor().fX * SkColorGetR(diffColor); |
| 384 | accum.fY += lightShader.fLights->ambientLightColor().fY * SkColorGetG(diffColor); |
| 385 | accum.fZ += lightShader.fLights->ambientLightColor().fZ * SkColorGetB(diffColor); |
| 386 | |
| 387 | // This is all done in linear unpremul color space (each component 0..255.0f though) |
| 388 | for (int l = 0; l < lightShader.fLights->numLights(); ++l) { |
| 389 | const SkLights::Light& light = lightShader.fLights->light(l); |
| 390 | |
| 391 | SkScalar illuminanceScalingFactor = 1.0f; |
| 392 | |
| 393 | if (SkLights::Light::kDirectional_LightType == light.type()) { |
| 394 | illuminanceScalingFactor = normals[i].dot(light.dir()); |
| 395 | if (illuminanceScalingFactor < 0.0f) { |
| 396 | illuminanceScalingFactor = 0.0f; |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | accum.fX += light.color().fX * SkColorGetR(diffColor) * illuminanceScalingFactor; |
| 401 | accum.fY += light.color().fY * SkColorGetG(diffColor) * illuminanceScalingFactor; |
| 402 | accum.fZ += light.color().fZ * SkColorGetB(diffColor) * illuminanceScalingFactor; |
| 403 | } |
| 404 | |
| 405 | // convert() premultiplies the accumulate color with alpha |
| 406 | result[i] = convert(accum, SkColorGetA(diffColor)); |
| 407 | } |
| 408 | |
| 409 | result += n; |
| 410 | x += n; |
| 411 | count -= n; |
| 412 | } while (count > 0); |
| 413 | } |
| 414 | |
| 415 | //////////////////////////////////////////////////////////////////////////// |
| 416 | |
| 417 | sk_sp<SkFlattenable> SkLightingShaderImpl::CreateProc(SkReadBuffer& buf) { |
| 418 | |
| 419 | // Discarding SkShader flattenable params |
| 420 | bool hasLocalMatrix = buf.readBool(); |
Robert Phillips | 75b7526 | 2018-07-24 08:23:14 -0400 | [diff] [blame] | 421 | if (hasLocalMatrix) { |
| 422 | return nullptr; |
| 423 | } |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 424 | |
| 425 | sk_sp<SkLights> lights = SkLights::MakeFromBuffer(buf); |
| 426 | |
| 427 | sk_sp<SkNormalSource> normalSource(buf.readFlattenable<SkNormalSource>()); |
| 428 | |
| 429 | bool hasDiffuse = buf.readBool(); |
| 430 | sk_sp<SkShader> diffuseShader = nullptr; |
| 431 | if (hasDiffuse) { |
| 432 | diffuseShader = buf.readFlattenable<SkShaderBase>(); |
| 433 | } |
| 434 | |
| 435 | return sk_make_sp<SkLightingShaderImpl>(std::move(diffuseShader), std::move(normalSource), |
| 436 | std::move(lights)); |
| 437 | } |
| 438 | |
| 439 | void SkLightingShaderImpl::flatten(SkWriteBuffer& buf) const { |
| 440 | this->INHERITED::flatten(buf); |
| 441 | |
| 442 | fLights->flatten(buf); |
| 443 | |
| 444 | buf.writeFlattenable(fNormalSource.get()); |
| 445 | buf.writeBool(static_cast<bool>(fDiffuseShader)); |
| 446 | if (fDiffuseShader) { |
| 447 | buf.writeFlattenable(fDiffuseShader.get()); |
| 448 | } |
| 449 | } |
| 450 | |
Mike Reed | e92aae6 | 2018-10-17 10:21:51 -0400 | [diff] [blame] | 451 | #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 452 | SkShaderBase::Context* SkLightingShaderImpl::onMakeContext( |
| 453 | const ContextRec& rec, SkArenaAlloc* alloc) const |
| 454 | { |
| 455 | SkShaderBase::Context *diffuseContext = nullptr; |
| 456 | if (fDiffuseShader) { |
| 457 | diffuseContext = as_SB(fDiffuseShader)->makeContext(rec, alloc); |
| 458 | if (!diffuseContext) { |
| 459 | return nullptr; |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | SkNormalSource::Provider* normalProvider = fNormalSource->asProvider(rec, alloc); |
| 464 | if (!normalProvider) { |
| 465 | return nullptr; |
| 466 | } |
| 467 | |
Mike Reed | 011d166 | 2019-02-28 17:19:25 -0500 | [diff] [blame] | 468 | // The diffuse shader can inspect the rec and make its decision about rec's colorspace. |
| 469 | // What about the lighting shader? Is lighting sensitive to the rec's (device) colorspace? |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 470 | return alloc->make<LightingShaderContext>(*this, rec, diffuseContext, normalProvider, nullptr); |
| 471 | } |
Mike Reed | e92aae6 | 2018-10-17 10:21:51 -0400 | [diff] [blame] | 472 | #endif |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 473 | |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 474 | /////////////////////////////////////////////////////////////////////////////// |
| 475 | |
| 476 | sk_sp<SkShader> SkLightingShader::Make(sk_sp<SkShader> diffuseShader, |
| 477 | sk_sp<SkNormalSource> normalSource, |
| 478 | sk_sp<SkLights> lights) { |
| 479 | SkASSERT(lights); |
| 480 | if (!normalSource) { |
| 481 | normalSource = SkNormalSource::MakeFlat(); |
| 482 | } |
| 483 | |
| 484 | return sk_make_sp<SkLightingShaderImpl>(std::move(diffuseShader), std::move(normalSource), |
| 485 | std::move(lights)); |
| 486 | } |
| 487 | |
| 488 | /////////////////////////////////////////////////////////////////////////////// |
| 489 | |
Brian Salomon | 2335644 | 2018-11-30 15:33:19 -0500 | [diff] [blame] | 490 | void SkLightingShader::RegisterFlattenables() { SK_REGISTER_FLATTENABLE(SkLightingShaderImpl); } |