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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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555 const char* scaleUni = builder->getUniformCStr(fScaleUni); | 555 const char* scaleUni = builder->getUniformCStr(fScaleUni); |
556 const char* dColor = "dColor"; | 556 const char* dColor = "dColor"; |
557 const char* cCoords = "cCoords"; | 557 const char* cCoords = "cCoords"; |
558 const char* outOfBounds = "outOfBounds"; | 558 const char* outOfBounds = "outOfBounds"; |
559 const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half floa
t, use | 559 const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half floa
t, use |
560 // a number smaller than that to approximate
0, but | 560 // a number smaller than that to approximate
0, but |
561 // leave room for 32-bit float GPU rounding e
rrors. | 561 // leave room for 32-bit float GPU rounding e
rrors. |
562 | 562 |
563 GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); | 563 GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
564 fsBuilder->codeAppendf("\t\tvec4 %s = ", dColor); | 564 fsBuilder->codeAppendf("\t\tvec4 %s = ", dColor); |
565 fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].typ
e()); | 565 fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].get
Type()); |
566 fsBuilder->codeAppend(";\n"); | 566 fsBuilder->codeAppend(";\n"); |
567 | 567 |
568 // Unpremultiply the displacement | 568 // Unpremultiply the displacement |
569 fsBuilder->codeAppendf("\t\t%s.rgb = (%s.a < %s) ? vec3(0.0) : clamp(%s.rgb
/ %s.a, 0.0, 1.0);", | 569 fsBuilder->codeAppendf("\t\t%s.rgb = (%s.a < %s) ? vec3(0.0) : clamp(%s.rgb
/ %s.a, 0.0, 1.0);", |
570 dColor, dColor, nearZero, dColor, dColor); | 570 dColor, dColor, nearZero, dColor, dColor); |
571 | 571 |
572 fsBuilder->codeAppendf("\t\tvec2 %s = %s + %s*(%s.", | 572 fsBuilder->codeAppendf("\t\tvec2 %s = %s + %s*(%s.", |
573 cCoords, coords[1].c_str(), scaleUni, dColor); | 573 cCoords, coords[1].c_str(), scaleUni, dColor); |
574 | 574 |
575 switch (fXChannelSelector) { | 575 switch (fXChannelSelector) { |
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608 SkDEBUGFAIL("Unknown Y channel selector"); | 608 SkDEBUGFAIL("Unknown Y channel selector"); |
609 } | 609 } |
610 fsBuilder->codeAppend("-vec2(0.5));\t\t"); | 610 fsBuilder->codeAppend("-vec2(0.5));\t\t"); |
611 | 611 |
612 // FIXME : This can be achieved with a "clamp to border" texture repeat mode
and | 612 // FIXME : This can be achieved with a "clamp to border" texture repeat mode
and |
613 // a 0 border color instead of computing if cCoords is out of bounds
here. | 613 // a 0 border color instead of computing if cCoords is out of bounds
here. |
614 fsBuilder->codeAppendf( | 614 fsBuilder->codeAppendf( |
615 "bool %s = (%s.x < 0.0) || (%s.y < 0.0) || (%s.x > 1.0) || (%s.y > 1.0);
\t\t", | 615 "bool %s = (%s.x < 0.0) || (%s.y < 0.0) || (%s.x > 1.0) || (%s.y > 1.0);
\t\t", |
616 outOfBounds, cCoords, cCoords, cCoords, cCoords); | 616 outOfBounds, cCoords, cCoords, cCoords, cCoords); |
617 fsBuilder->codeAppendf("%s = %s ? vec4(0.0) : ", outputColor, outOfBounds); | 617 fsBuilder->codeAppendf("%s = %s ? vec4(0.0) : ", outputColor, outOfBounds); |
618 fsBuilder->appendTextureLookup(samplers[1], cCoords, coords[1].type()); | 618 fsBuilder->appendTextureLookup(samplers[1], cCoords, coords[1].getType()); |
619 fsBuilder->codeAppend(";\n"); | 619 fsBuilder->codeAppend(";\n"); |
620 } | 620 } |
621 | 621 |
622 void GrGLDisplacementMapEffect::setData(const GrGLProgramDataManager& pdman, | 622 void GrGLDisplacementMapEffect::setData(const GrGLProgramDataManager& pdman, |
623 const GrEffect& effect) { | 623 const GrEffect& effect) { |
624 const GrDisplacementMapEffect& displacementMap = effect.cast<GrDisplacementM
apEffect>(); | 624 const GrDisplacementMapEffect& displacementMap = effect.cast<GrDisplacementM
apEffect>(); |
625 GrTexture* colorTex = displacementMap.texture(1); | 625 GrTexture* colorTex = displacementMap.texture(1); |
626 SkScalar scaleX = SkScalarDiv(displacementMap.scale().fX, SkIntToScalar(colo
rTex->width())); | 626 SkScalar scaleX = SkScalarDiv(displacementMap.scale().fX, SkIntToScalar(colo
rTex->width())); |
627 SkScalar scaleY = SkScalarDiv(displacementMap.scale().fY, SkIntToScalar(colo
rTex->height())); | 627 SkScalar scaleY = SkScalarDiv(displacementMap.scale().fY, SkIntToScalar(colo
rTex->height())); |
628 pdman.set2f(fScaleUni, SkScalarToFloat(scaleX), | 628 pdman.set2f(fScaleUni, SkScalarToFloat(scaleX), |
629 colorTex->origin() == kTopLeft_GrSurfaceOrigin ? | 629 colorTex->origin() == kTopLeft_GrSurfaceOrigin ? |
630 SkScalarToFloat(scaleY) : SkScalarToFloat(-scaleY)); | 630 SkScalarToFloat(scaleY) : SkScalarToFloat(-scaleY)); |
631 } | 631 } |
632 | 632 |
633 void GrGLDisplacementMapEffect::GenKey(const GrEffect& effect, | 633 void GrGLDisplacementMapEffect::GenKey(const GrEffect& effect, |
634 const GrGLCaps&, GrEffectKeyBuilder* b) { | 634 const GrGLCaps&, GrEffectKeyBuilder* b) { |
635 const GrDisplacementMapEffect& displacementMap = effect.cast<GrDisplacementM
apEffect>(); | 635 const GrDisplacementMapEffect& displacementMap = effect.cast<GrDisplacementM
apEffect>(); |
636 | 636 |
637 uint32_t xKey = displacementMap.xChannelSelector(); | 637 uint32_t xKey = displacementMap.xChannelSelector(); |
638 uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBit
s; | 638 uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBit
s; |
639 | 639 |
640 b->add32(xKey | yKey); | 640 b->add32(xKey | yKey); |
641 } | 641 } |
642 #endif | 642 #endif |
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