1/* 2 * Copyright 2012 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 "GrTextureDomain.h" 9#include "GrInvariantOutput.h" 10#include "GrSimpleTextureEffect.h" 11#include "SkFloatingPoint.h" 12#include "gl/GrGLProcessor.h" 13#include "gl/builders/GrGLProgramBuilder.h" 14 15GrTextureDomain::GrTextureDomain(const SkRect& domain, Mode mode, int index) 16 : fIndex(index) { 17 18 static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1}; 19 if (domain.contains(kFullRect) && kClamp_Mode == mode) { 20 fMode = kIgnore_Mode; 21 } else { 22 fMode = mode; 23 } 24 25 if (fMode != kIgnore_Mode) { 26 // We don't currently handle domains that are empty or don't intersect the texture. 27 // It is OK if the domain rect is a line or point, but it should not be inverted. We do not 28 // handle rects that do not intersect the [0..1]x[0..1] rect. 29 SkASSERT(domain.fLeft <= domain.fRight); 30 SkASSERT(domain.fTop <= domain.fBottom); 31 fDomain.fLeft = SkScalarPin(domain.fLeft, kFullRect.fLeft, kFullRect.fRight); 32 fDomain.fRight = SkScalarPin(domain.fRight, kFullRect.fLeft, kFullRect.fRight); 33 fDomain.fTop = SkScalarPin(domain.fTop, kFullRect.fTop, kFullRect.fBottom); 34 fDomain.fBottom = SkScalarPin(domain.fBottom, kFullRect.fTop, kFullRect.fBottom); 35 SkASSERT(fDomain.fLeft <= fDomain.fRight); 36 SkASSERT(fDomain.fTop <= fDomain.fBottom); 37 } 38} 39 40////////////////////////////////////////////////////////////////////////////// 41 42void GrTextureDomain::GLDomain::sampleTexture(GrGLShaderBuilder* builder, 43 const GrTextureDomain& textureDomain, 44 const char* outColor, 45 const SkString& inCoords, 46 const GrGLProcessor::TextureSampler sampler, 47 const char* inModulateColor) { 48 SkASSERT((Mode)-1 == fMode || textureDomain.mode() == fMode); 49 SkDEBUGCODE(fMode = textureDomain.mode();) 50 51 GrGLProgramBuilder* program = builder->getProgramBuilder(); 52 53 if (textureDomain.mode() != kIgnore_Mode && !fDomainUni.isValid()) { 54 const char* name; 55 SkString uniName("TexDom"); 56 if (textureDomain.fIndex >= 0) { 57 uniName.appendS32(textureDomain.fIndex); 58 } 59 fDomainUni = program->addUniform(GrGLProgramBuilder::kFragment_Visibility, 60 kVec4f_GrSLType, kDefault_GrSLPrecision, 61 uniName.c_str(), &name); 62 fDomainName = name; 63 } 64 65 switch (textureDomain.mode()) { 66 case kIgnore_Mode: { 67 builder->codeAppendf("\t%s = ", outColor); 68 builder->appendTextureLookupAndModulate(inModulateColor, sampler, 69 inCoords.c_str()); 70 builder->codeAppend(";\n"); 71 break; 72 } 73 case kClamp_Mode: { 74 SkString clampedCoords; 75 clampedCoords.appendf("\tclamp(%s, %s.xy, %s.zw)", 76 inCoords.c_str(), fDomainName.c_str(), fDomainName.c_str()); 77 78 builder->codeAppendf("\t%s = ", outColor); 79 builder->appendTextureLookupAndModulate(inModulateColor, sampler, 80 clampedCoords.c_str()); 81 builder->codeAppend(";\n"); 82 break; 83 } 84 case kDecal_Mode: { 85 // Add a block since we're going to declare variables. 86 GrGLShaderBuilder::ShaderBlock block(builder); 87 88 const char* domain = fDomainName.c_str(); 89 if (kImagination_GrGLVendor == program->ctxInfo().vendor()) { 90 // On the NexusS and GalaxyNexus, the other path (with the 'any' 91 // call) causes the compilation error "Calls to any function that 92 // may require a gradient calculation inside a conditional block 93 // may return undefined results". This appears to be an issue with 94 // the 'any' call since even the simple "result=black; if (any()) 95 // result=white;" code fails to compile. 96 builder->codeAppend("\tvec4 outside = vec4(0.0, 0.0, 0.0, 0.0);\n"); 97 builder->codeAppend("\tvec4 inside = "); 98 builder->appendTextureLookupAndModulate(inModulateColor, sampler, 99 inCoords.c_str()); 100 builder->codeAppend(";\n"); 101 builder->codeAppendf("\tfloat x = (%s).x;\n", inCoords.c_str()); 102 builder->codeAppendf("\tfloat y = (%s).y;\n", inCoords.c_str()); 103 104 builder->codeAppendf("\tx = abs(2.0*(x - %s.x)/(%s.z - %s.x) - 1.0);\n", 105 domain, domain, domain); 106 builder->codeAppendf("\ty = abs(2.0*(y - %s.y)/(%s.w - %s.y) - 1.0);\n", 107 domain, domain, domain); 108 builder->codeAppend("\tfloat blend = step(1.0, max(x, y));\n"); 109 builder->codeAppendf("\t%s = mix(inside, outside, blend);\n", outColor); 110 } else { 111 builder->codeAppend("\tbvec4 outside;\n"); 112 builder->codeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", inCoords.c_str(), 113 domain); 114 builder->codeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", inCoords.c_str(), 115 domain); 116 builder->codeAppendf("\t%s = any(outside) ? vec4(0.0, 0.0, 0.0, 0.0) : ", 117 outColor); 118 builder->appendTextureLookupAndModulate(inModulateColor, sampler, 119 inCoords.c_str()); 120 builder->codeAppend(";\n"); 121 } 122 break; 123 } 124 case kRepeat_Mode: { 125 SkString clampedCoords; 126 clampedCoords.printf("\tmod(%s - %s.xy, %s.zw - %s.xy) + %s.xy", 127 inCoords.c_str(), fDomainName.c_str(), fDomainName.c_str(), 128 fDomainName.c_str(), fDomainName.c_str()); 129 130 builder->codeAppendf("\t%s = ", outColor); 131 builder->appendTextureLookupAndModulate(inModulateColor, sampler, 132 clampedCoords.c_str()); 133 builder->codeAppend(";\n"); 134 break; 135 } 136 } 137} 138 139void GrTextureDomain::GLDomain::setData(const GrGLProgramDataManager& pdman, 140 const GrTextureDomain& textureDomain, 141 GrSurfaceOrigin textureOrigin) { 142 SkASSERT(textureDomain.mode() == fMode); 143 if (kIgnore_Mode != textureDomain.mode()) { 144 GrGLfloat values[4] = { 145 SkScalarToFloat(textureDomain.domain().left()), 146 SkScalarToFloat(textureDomain.domain().top()), 147 SkScalarToFloat(textureDomain.domain().right()), 148 SkScalarToFloat(textureDomain.domain().bottom()) 149 }; 150 // vertical flip if necessary 151 if (kBottomLeft_GrSurfaceOrigin == textureOrigin) { 152 values[1] = 1.0f - values[1]; 153 values[3] = 1.0f - values[3]; 154 // The top and bottom were just flipped, so correct the ordering 155 // of elements so that values = (l, t, r, b). 156 SkTSwap(values[1], values[3]); 157 } 158 if (0 != memcmp(values, fPrevDomain, 4 * sizeof(GrGLfloat))) { 159 pdman.set4fv(fDomainUni, 1, values); 160 memcpy(fPrevDomain, values, 4 * sizeof(GrGLfloat)); 161 } 162 } 163} 164 165 166////////////////////////////////////////////////////////////////////////////// 167 168class GrGLTextureDomainEffect : public GrGLFragmentProcessor { 169public: 170 GrGLTextureDomainEffect(const GrProcessor&); 171 172 virtual void emitCode(GrGLFPBuilder*, 173 const GrFragmentProcessor&, 174 const char* outputColor, 175 const char* inputColor, 176 const TransformedCoordsArray&, 177 const TextureSamplerArray&) override; 178 179 void setData(const GrGLProgramDataManager&, const GrProcessor&) override; 180 181 static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*); 182 183private: 184 GrTextureDomain::GLDomain fGLDomain; 185 typedef GrGLFragmentProcessor INHERITED; 186}; 187 188GrGLTextureDomainEffect::GrGLTextureDomainEffect(const GrProcessor&) { 189} 190 191void GrGLTextureDomainEffect::emitCode(GrGLFPBuilder* builder, 192 const GrFragmentProcessor& fp, 193 const char* outputColor, 194 const char* inputColor, 195 const TransformedCoordsArray& coords, 196 const TextureSamplerArray& samplers) { 197 const GrTextureDomainEffect& textureDomainEffect = fp.cast<GrTextureDomainEffect>(); 198 const GrTextureDomain& domain = textureDomainEffect.textureDomain(); 199 200 GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); 201 SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0); 202 fGLDomain.sampleTexture(fsBuilder, domain, outputColor, coords2D, samplers[0], inputColor); 203} 204 205void GrGLTextureDomainEffect::setData(const GrGLProgramDataManager& pdman, 206 const GrProcessor& processor) { 207 const GrTextureDomainEffect& textureDomainEffect = processor.cast<GrTextureDomainEffect>(); 208 const GrTextureDomain& domain = textureDomainEffect.textureDomain(); 209 fGLDomain.setData(pdman, domain, processor.texture(0)->origin()); 210} 211 212void GrGLTextureDomainEffect::GenKey(const GrProcessor& processor, const GrGLSLCaps&, 213 GrProcessorKeyBuilder* b) { 214 const GrTextureDomain& domain = processor.cast<GrTextureDomainEffect>().textureDomain(); 215 b->add32(GrTextureDomain::GLDomain::DomainKey(domain)); 216} 217 218 219/////////////////////////////////////////////////////////////////////////////// 220 221GrFragmentProcessor* GrTextureDomainEffect::Create(GrTexture* texture, 222 const SkMatrix& matrix, 223 const SkRect& domain, 224 GrTextureDomain::Mode mode, 225 GrTextureParams::FilterMode filterMode, 226 GrCoordSet coordSet) { 227 static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1}; 228 if (GrTextureDomain::kIgnore_Mode == mode || 229 (GrTextureDomain::kClamp_Mode == mode && domain.contains(kFullRect))) { 230 return GrSimpleTextureEffect::Create(texture, matrix, filterMode); 231 } else { 232 233 return SkNEW_ARGS(GrTextureDomainEffect, (texture, 234 matrix, 235 domain, 236 mode, 237 filterMode, 238 coordSet)); 239 } 240} 241 242GrTextureDomainEffect::GrTextureDomainEffect(GrTexture* texture, 243 const SkMatrix& matrix, 244 const SkRect& domain, 245 GrTextureDomain::Mode mode, 246 GrTextureParams::FilterMode filterMode, 247 GrCoordSet coordSet) 248 : GrSingleTextureEffect(texture, matrix, filterMode, coordSet) 249 , fTextureDomain(domain, mode) { 250 SkASSERT(mode != GrTextureDomain::kRepeat_Mode || 251 filterMode == GrTextureParams::kNone_FilterMode); 252 this->initClassID<GrTextureDomainEffect>(); 253} 254 255GrTextureDomainEffect::~GrTextureDomainEffect() { 256 257} 258 259void GrTextureDomainEffect::getGLProcessorKey(const GrGLSLCaps& caps, 260 GrProcessorKeyBuilder* b) const { 261 GrGLTextureDomainEffect::GenKey(*this, caps, b); 262} 263 264GrGLFragmentProcessor* GrTextureDomainEffect::createGLInstance() const { 265 return SkNEW_ARGS(GrGLTextureDomainEffect, (*this)); 266} 267 268bool GrTextureDomainEffect::onIsEqual(const GrFragmentProcessor& sBase) const { 269 const GrTextureDomainEffect& s = sBase.cast<GrTextureDomainEffect>(); 270 return this->fTextureDomain == s.fTextureDomain; 271} 272 273void GrTextureDomainEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 274 if (GrTextureDomain::kDecal_Mode == fTextureDomain.mode()) { // TODO: helper 275 if (GrPixelConfigIsAlphaOnly(this->texture(0)->config())) { 276 inout->mulByUnknownSingleComponent(); 277 } else { 278 inout->mulByUnknownFourComponents(); 279 } 280 } else { 281 this->updateInvariantOutputForModulation(inout); 282 } 283} 284 285/////////////////////////////////////////////////////////////////////////////// 286 287GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrTextureDomainEffect); 288 289GrFragmentProcessor* GrTextureDomainEffect::TestCreate(SkRandom* random, 290 GrContext*, 291 const GrDrawTargetCaps&, 292 GrTexture* textures[]) { 293 int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : 294 GrProcessorUnitTest::kAlphaTextureIdx; 295 SkRect domain; 296 domain.fLeft = random->nextUScalar1(); 297 domain.fRight = random->nextRangeScalar(domain.fLeft, SK_Scalar1); 298 domain.fTop = random->nextUScalar1(); 299 domain.fBottom = random->nextRangeScalar(domain.fTop, SK_Scalar1); 300 GrTextureDomain::Mode mode = 301 (GrTextureDomain::Mode) random->nextULessThan(GrTextureDomain::kModeCount); 302 const SkMatrix& matrix = GrTest::TestMatrix(random); 303 bool bilerp = mode != GrTextureDomain::kRepeat_Mode ? random->nextBool() : false; 304 GrCoordSet coords = random->nextBool() ? kLocal_GrCoordSet : kDevice_GrCoordSet; 305 return GrTextureDomainEffect::Create(textures[texIdx], 306 matrix, 307 domain, 308 mode, 309 bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode, 310 coords); 311} 312