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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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