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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkDisplacementMapEffect.h" | 8 #include "SkDisplacementMapEffect.h" |
9 #include "SkReadBuffer.h" | 9 #include "SkReadBuffer.h" |
10 #include "SkWriteBuffer.h" | 10 #include "SkWriteBuffer.h" |
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296 | 296 |
297 /////////////////////////////////////////////////////////////////////////////// | 297 /////////////////////////////////////////////////////////////////////////////// |
298 | 298 |
299 #if SK_SUPPORT_GPU | 299 #if SK_SUPPORT_GPU |
300 class GrGLDisplacementMapEffect : public GrGLFragmentProcessor { | 300 class GrGLDisplacementMapEffect : public GrGLFragmentProcessor { |
301 public: | 301 public: |
302 GrGLDisplacementMapEffect(const GrBackendProcessorFactory&, | 302 GrGLDisplacementMapEffect(const GrBackendProcessorFactory&, |
303 const GrProcessor&); | 303 const GrProcessor&); |
304 virtual ~GrGLDisplacementMapEffect(); | 304 virtual ~GrGLDisplacementMapEffect(); |
305 | 305 |
306 virtual void emitCode(GrGLProgramBuilder*, | 306 virtual void emitCode(GrGLFPBuilder*, |
307 const GrFragmentProcessor&, | 307 const GrFragmentProcessor&, |
308 const GrProcessorKey&, | 308 const GrProcessorKey&, |
309 const char* outputColor, | 309 const char* outputColor, |
310 const char* inputColor, | 310 const char* inputColor, |
311 const TransformedCoordsArray&, | 311 const TransformedCoordsArray&, |
312 const TextureSamplerArray&) SK_OVERRIDE; | 312 const TextureSamplerArray&) SK_OVERRIDE; |
313 | 313 |
314 static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKe
yBuilder*); | 314 static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKe
yBuilder*); |
315 | 315 |
316 virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_O
VERRIDE; | 316 virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_O
VERRIDE; |
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533 GrGLDisplacementMapEffect::GrGLDisplacementMapEffect(const GrBackendProcessorFac
tory& factory, | 533 GrGLDisplacementMapEffect::GrGLDisplacementMapEffect(const GrBackendProcessorFac
tory& factory, |
534 const GrProcessor& proc) | 534 const GrProcessor& proc) |
535 : INHERITED(factory) | 535 : INHERITED(factory) |
536 , fXChannelSelector(proc.cast<GrDisplacementMapEffect>().xChannelSelector()) | 536 , fXChannelSelector(proc.cast<GrDisplacementMapEffect>().xChannelSelector()) |
537 , fYChannelSelector(proc.cast<GrDisplacementMapEffect>().yChannelSelector())
{ | 537 , fYChannelSelector(proc.cast<GrDisplacementMapEffect>().yChannelSelector())
{ |
538 } | 538 } |
539 | 539 |
540 GrGLDisplacementMapEffect::~GrGLDisplacementMapEffect() { | 540 GrGLDisplacementMapEffect::~GrGLDisplacementMapEffect() { |
541 } | 541 } |
542 | 542 |
543 void GrGLDisplacementMapEffect::emitCode(GrGLProgramBuilder* builder, | 543 void GrGLDisplacementMapEffect::emitCode(GrGLFPBuilder* builder, |
544 const GrFragmentProcessor&, | 544 const GrFragmentProcessor&, |
545 const GrProcessorKey& key, | 545 const GrProcessorKey& key, |
546 const char* outputColor, | 546 const char* outputColor, |
547 const char* inputColor, | 547 const char* inputColor, |
548 const TransformedCoordsArray& coords, | 548 const TransformedCoordsArray& coords, |
549 const TextureSamplerArray& samplers) { | 549 const TextureSamplerArray& samplers) { |
550 sk_ignore_unused_variable(inputColor); | 550 sk_ignore_unused_variable(inputColor); |
551 | 551 |
552 fScaleUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, | 552 fScaleUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
553 kVec2f_GrSLType, "Scale"); | 553 kVec2f_GrSLType, "Scale"); |
554 const char* scaleUni = builder->getUniformCStr(fScaleUni); | 554 const char* scaleUni = builder->getUniformCStr(fScaleUni); |
555 const char* dColor = "dColor"; | 555 const char* dColor = "dColor"; |
556 const char* cCoords = "cCoords"; | 556 const char* cCoords = "cCoords"; |
557 const char* outOfBounds = "outOfBounds"; | 557 const char* outOfBounds = "outOfBounds"; |
558 const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half floa
t, use | 558 const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half floa
t, use |
559 // a number smaller than that to approximate
0, but | 559 // a number smaller than that to approximate
0, but |
560 // leave room for 32-bit float GPU rounding e
rrors. | 560 // leave room for 32-bit float GPU rounding e
rrors. |
561 | 561 |
562 GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); | 562 GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
563 fsBuilder->codeAppendf("\t\tvec4 %s = ", dColor); | 563 fsBuilder->codeAppendf("\t\tvec4 %s = ", dColor); |
564 fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].get
Type()); | 564 fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].get
Type()); |
565 fsBuilder->codeAppend(";\n"); | 565 fsBuilder->codeAppend(";\n"); |
566 | 566 |
567 // Unpremultiply the displacement | 567 // Unpremultiply the displacement |
568 fsBuilder->codeAppendf("\t\t%s.rgb = (%s.a < %s) ? vec3(0.0) : clamp(%s.rgb
/ %s.a, 0.0, 1.0);", | 568 fsBuilder->codeAppendf("\t\t%s.rgb = (%s.a < %s) ? vec3(0.0) : clamp(%s.rgb
/ %s.a, 0.0, 1.0);", |
569 dColor, dColor, nearZero, dColor, dColor); | 569 dColor, dColor, nearZero, dColor, dColor); |
570 | 570 |
571 fsBuilder->codeAppendf("\t\tvec2 %s = %s + %s*(%s.", | 571 fsBuilder->codeAppendf("\t\tvec2 %s = %s + %s*(%s.", |
572 cCoords, coords[1].c_str(), scaleUni, dColor); | 572 cCoords, coords[1].c_str(), scaleUni, dColor); |
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632 void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc, | 632 void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc, |
633 const GrGLCaps&, GrProcessorKeyBuilder* b
) { | 633 const GrGLCaps&, GrProcessorKeyBuilder* b
) { |
634 const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMap
Effect>(); | 634 const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMap
Effect>(); |
635 | 635 |
636 uint32_t xKey = displacementMap.xChannelSelector(); | 636 uint32_t xKey = displacementMap.xChannelSelector(); |
637 uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBit
s; | 637 uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBit
s; |
638 | 638 |
639 b->add32(xKey | yKey); | 639 b->add32(xKey | yKey); |
640 } | 640 } |
641 #endif | 641 #endif |
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