| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrDistanceFieldTextureEffect.h" |
| #include "GrInvariantOutput.h" |
| #include "GrTexture.h" |
| #include "SkDistanceFieldGen.h" |
| #include "gl/GrGLProcessor.h" |
| #include "gl/GrGLSL.h" |
| #include "gl/GrGLTexture.h" |
| #include "gl/GrGLGeometryProcessor.h" |
| #include "gl/builders/GrGLProgramBuilder.h" |
| |
| // Assuming a radius of the diagonal of the fragment, hence a factor of sqrt(2)/2 |
| #define SK_DistanceFieldAAFactor "0.7071" |
| |
| class GrGLDistanceFieldTextureEffect : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldTextureEffect(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fTextureSize(SkISize::Make(-1,-1)) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fLuminance(-1.0f) |
| #endif |
| {} |
| |
| virtual void emitCode(const EmitArgs& args) SK_OVERRIDE { |
| const GrDistanceFieldTextureEffect& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldTextureEffect>(); |
| |
| GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| GrGLVertToFrag v(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &v); |
| vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // setup color attribute |
| if(dfTexEffect.inColor()) { |
| args.fPB->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor); |
| } |
| |
| // setup position varying |
| vsBuilder->codeAppendf("%s = %s * vec3(%s, 1);", vsBuilder->glPosition(), |
| vsBuilder->uViewM(), dfTexEffect.inPosition()->fName); |
| |
| // setup output coords |
| vsBuilder->codeAppendf("%s = %s;", vsBuilder->positionCoords(), |
| dfTexEffect.inPosition()->fName); |
| vsBuilder->codeAppendf("%s = %s;", vsBuilder->localCoords(), |
| dfTexEffect.inPosition()->fName); |
| |
| const char* textureSizeUniName = NULL; |
| fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "TextureSize", &textureSizeUniName); |
| |
| fsBuilder->codeAppend("\tvec4 texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], |
| v.fsIn(), |
| kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tfloat distance = " |
| SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ");"); |
| |
| // we adjust for the effect of the transformation on the distance by using |
| // the length of the gradient of the texture coordinates. We use st coordinates |
| // to ensure we're mapping 1:1 from texel space to pixel space. |
| fsBuilder->codeAppendf("\tvec2 uv = %s;\n", v.fsIn()); |
| fsBuilder->codeAppendf("\tvec2 st = uv*%s;\n", textureSizeUniName); |
| fsBuilder->codeAppend("\tfloat afwidth;\n"); |
| if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) { |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("\tafwidth = abs(" SK_DistanceFieldAAFactor "*dFdx(st.x));\n"); |
| } else { |
| fsBuilder->codeAppend("\tvec2 Jdx = dFdx(st);\n"); |
| fsBuilder->codeAppend("\tvec2 Jdy = dFdy(st);\n"); |
| |
| fsBuilder->codeAppend("\tvec2 uv_grad;\n"); |
| if (args.fPB->ctxInfo().caps()->dropsTileOnZeroDivide()) { |
| // this is to compensate for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("\tfloat uv_len2 = dot(uv, uv);\n"); |
| fsBuilder->codeAppend("\tif (uv_len2 < 0.0001) {\n"); |
| fsBuilder->codeAppend("\t\tuv_grad = vec2(0.7071, 0.7071);\n"); |
| fsBuilder->codeAppend("\t} else {\n"); |
| fsBuilder->codeAppend("\t\tuv_grad = uv*inversesqrt(uv_len2);\n"); |
| fsBuilder->codeAppend("\t}\n"); |
| } else { |
| fsBuilder->codeAppend("\tuv_grad = normalize(uv);\n"); |
| } |
| fsBuilder->codeAppend("\tvec2 grad = vec2(uv_grad.x*Jdx.x + uv_grad.y*Jdy.x,\n"); |
| fsBuilder->codeAppend("\t uv_grad.x*Jdx.y + uv_grad.y*Jdy.y);\n"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*length(grad);\n"); |
| } |
| fsBuilder->codeAppend("\tfloat val = smoothstep(-afwidth, afwidth, distance);\n"); |
| |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust based on gamma |
| const char* luminanceUniName = NULL; |
| // width, height, 1/(3*width) |
| fLuminanceUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, kDefault_GrSLPrecision, |
| "Luminance", &luminanceUniName); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val, %s);\n", luminanceUniName); |
| fsBuilder->codeAppend("\tvec4 gammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tval = gammaColor.r;\n"); |
| #endif |
| |
| fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| virtual void setData(const GrGLProgramDataManager& pdman, |
| const GrGeometryProcessor& proc, |
| const GrBatchTracker&) SK_OVERRIDE { |
| SkASSERT(fTextureSizeUni.isValid()); |
| |
| GrTexture* texture = proc.texture(0); |
| if (texture->width() != fTextureSize.width() || |
| texture->height() != fTextureSize.height()) { |
| fTextureSize = SkISize::Make(texture->width(), texture->height()); |
| pdman.set2f(fTextureSizeUni, |
| SkIntToScalar(fTextureSize.width()), |
| SkIntToScalar(fTextureSize.height())); |
| } |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| const GrDistanceFieldTextureEffect& dfTexEffect = |
| proc.cast<GrDistanceFieldTextureEffect>(); |
| float luminance = dfTexEffect.getLuminance(); |
| if (luminance != fLuminance) { |
| pdman.set1f(fLuminanceUni, luminance); |
| fLuminance = luminance; |
| } |
| #endif |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& processor, |
| const GrBatchTracker&, |
| const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldTextureEffect& dfTexEffect = |
| processor.cast<GrDistanceFieldTextureEffect>(); |
| |
| b->add32(dfTexEffect.getFlags()); |
| } |
| |
| private: |
| GrGLProgramDataManager::UniformHandle fTextureSizeUni; |
| SkISize fTextureSize; |
| GrGLProgramDataManager::UniformHandle fLuminanceUni; |
| float fLuminance; |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldTextureEffect::GrDistanceFieldTextureEffect(GrColor color, |
| GrTexture* texture, |
| const GrTextureParams& params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| GrTexture* gamma, |
| const GrTextureParams& gammaParams, |
| float luminance, |
| #endif |
| uint32_t flags, bool opaqueVertexColors) |
| : INHERITED(color, opaqueVertexColors) |
| , fTextureAccess(texture, params) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fGammaTextureAccess(gamma, gammaParams) |
| , fLuminance(luminance) |
| #endif |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) |
| , fInColor(NULL) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldTextureEffect>(); |
| fInPosition = &this->addVertexAttrib(GrAttribute("inPosition", kVec2f_GrVertexAttribType)); |
| if (flags & kColorAttr_DistanceFieldEffectFlag) { |
| fInColor = &this->addVertexAttrib(GrAttribute("inColor", kVec4ub_GrVertexAttribType)); |
| this->setHasVertexColor(); |
| } |
| fInTextureCoords = &this->addVertexAttrib(GrAttribute("inTextureCoords", |
| kVec2f_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| this->addTextureAccess(&fGammaTextureAccess); |
| #endif |
| } |
| |
| bool GrDistanceFieldTextureEffect::onIsEqual(const GrGeometryProcessor& other) const { |
| const GrDistanceFieldTextureEffect& cte = other.cast<GrDistanceFieldTextureEffect>(); |
| return |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| fLuminance == cte.fLuminance && |
| #endif |
| fFlags == cte.fFlags; |
| } |
| |
| void GrDistanceFieldTextureEffect::onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const { |
| out->setUnknownSingleComponent(); |
| } |
| |
| void GrDistanceFieldTextureEffect::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldTextureEffect::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLGeometryProcessor* |
| GrDistanceFieldTextureEffect::createGLInstance(const GrBatchTracker& bt) const { |
| return SkNEW_ARGS(GrGLDistanceFieldTextureEffect, (*this, bt)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldTextureEffect); |
| |
| GrGeometryProcessor* GrDistanceFieldTextureEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| int texIdx2 = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| #endif |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| GrTextureParams params2(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| #endif |
| |
| return GrDistanceFieldTextureEffect::Create(GrRandomColor(random), textures[texIdx], params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| textures[texIdx2], params2, |
| random->nextF(), |
| #endif |
| random->nextBool() ? |
| kSimilarity_DistanceFieldEffectFlag : 0, |
| random->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrGLDistanceFieldNoGammaTextureEffect : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldNoGammaTextureEffect(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fTextureSize(SkISize::Make(-1, -1)) {} |
| |
| virtual void emitCode(const EmitArgs& args) SK_OVERRIDE { |
| const GrDistanceFieldNoGammaTextureEffect& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldNoGammaTextureEffect>(); |
| |
| GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| GrGLVertToFrag v(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &v); |
| |
| // setup color attribute |
| if(dfTexEffect.inColor()) { |
| args.fPB->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor); |
| } |
| |
| vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // setup coord outputs |
| vsBuilder->codeAppendf("%s = %s;", vsBuilder->positionCoords(), |
| dfTexEffect.inPosition()->fName); |
| vsBuilder->codeAppendf("%s = %s;", vsBuilder->localCoords(), |
| dfTexEffect.inPosition()->fName); |
| |
| // setup position varying |
| vsBuilder->codeAppendf("%s = %s * vec3(%s, 1);", vsBuilder->glPosition(), |
| vsBuilder->uViewM(), dfTexEffect.inPosition()->fName); |
| |
| const char* textureSizeUniName = NULL; |
| fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "TextureSize", &textureSizeUniName); |
| |
| fsBuilder->codeAppend("vec4 texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], |
| v.fsIn(), |
| kVec2f_GrSLType); |
| fsBuilder->codeAppend(";"); |
| fsBuilder->codeAppend("float distance = " |
| SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ");"); |
| |
| // we adjust for the effect of the transformation on the distance by using |
| // the length of the gradient of the texture coordinates. We use st coordinates |
| // to ensure we're mapping 1:1 from texel space to pixel space. |
| fsBuilder->codeAppendf("vec2 uv = %s;", v.fsIn()); |
| fsBuilder->codeAppendf("vec2 st = uv*%s;", textureSizeUniName); |
| fsBuilder->codeAppend("float afwidth;"); |
| if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) { |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdx(st.x));"); |
| } else { |
| fsBuilder->codeAppend("vec2 Jdx = dFdx(st);"); |
| fsBuilder->codeAppend("vec2 Jdy = dFdy(st);"); |
| |
| fsBuilder->codeAppend("vec2 uv_grad;"); |
| if (args.fPB->ctxInfo().caps()->dropsTileOnZeroDivide()) { |
| // this is to compensate for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("float uv_len2 = dot(uv, uv);"); |
| fsBuilder->codeAppend("if (uv_len2 < 0.0001) {"); |
| fsBuilder->codeAppend("uv_grad = vec2(0.7071, 0.7071);"); |
| fsBuilder->codeAppend("} else {"); |
| fsBuilder->codeAppend("uv_grad = uv*inversesqrt(uv_len2);"); |
| fsBuilder->codeAppend("}"); |
| } else { |
| fsBuilder->codeAppend("uv_grad = normalize(uv);"); |
| } |
| fsBuilder->codeAppend("vec2 grad = vec2(uv_grad.x*Jdx.x + uv_grad.y*Jdy.x,"); |
| fsBuilder->codeAppend(" uv_grad.x*Jdx.y + uv_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| fsBuilder->codeAppend("float val = smoothstep(-afwidth, afwidth, distance);"); |
| |
| fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| virtual void setData(const GrGLProgramDataManager& pdman, |
| const GrGeometryProcessor& proc, |
| const GrBatchTracker&) SK_OVERRIDE { |
| SkASSERT(fTextureSizeUni.isValid()); |
| |
| GrTexture* texture = proc.texture(0); |
| if (texture->width() != fTextureSize.width() || |
| texture->height() != fTextureSize.height()) { |
| fTextureSize = SkISize::Make(texture->width(), texture->height()); |
| pdman.set2f(fTextureSizeUni, |
| SkIntToScalar(fTextureSize.width()), |
| SkIntToScalar(fTextureSize.height())); |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& proc, |
| const GrBatchTracker&, |
| const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldNoGammaTextureEffect& dfTexEffect = |
| proc.cast<GrDistanceFieldNoGammaTextureEffect>(); |
| |
| b->add32(dfTexEffect.getFlags()); |
| } |
| |
| private: |
| GrGLProgramDataManager::UniformHandle fTextureSizeUni; |
| SkISize fTextureSize; |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldNoGammaTextureEffect::GrDistanceFieldNoGammaTextureEffect( |
| GrColor color, |
| GrTexture* texture, |
| const GrTextureParams& params, |
| uint32_t flags, |
| bool opaqueVertexColors) |
| : INHERITED(color, opaqueVertexColors) |
| , fTextureAccess(texture, params) |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) |
| , fInColor(NULL) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldNoGammaTextureEffect>(); |
| fInPosition = &this->addVertexAttrib(GrAttribute("inPosition", kVec2f_GrVertexAttribType)); |
| if (flags & kColorAttr_DistanceFieldEffectFlag) { |
| fInColor = &this->addVertexAttrib(GrAttribute("inColor", kVec4ub_GrVertexAttribType)); |
| this->setHasVertexColor(); |
| } |
| fInTextureCoords = &this->addVertexAttrib(GrAttribute("inTextureCoords", |
| kVec2f_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| bool GrDistanceFieldNoGammaTextureEffect::onIsEqual(const GrGeometryProcessor& other) const { |
| const GrDistanceFieldNoGammaTextureEffect& cte = |
| other.cast<GrDistanceFieldNoGammaTextureEffect>(); |
| return fFlags == cte.fFlags; |
| } |
| |
| void GrDistanceFieldNoGammaTextureEffect::onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const{ |
| out->setUnknownSingleComponent(); |
| } |
| |
| void GrDistanceFieldNoGammaTextureEffect::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldNoGammaTextureEffect::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLGeometryProcessor* |
| GrDistanceFieldNoGammaTextureEffect::createGLInstance(const GrBatchTracker& bt) const { |
| return SkNEW_ARGS(GrGLDistanceFieldNoGammaTextureEffect, (*this, bt)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldNoGammaTextureEffect); |
| |
| GrGeometryProcessor* GrDistanceFieldNoGammaTextureEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx |
| : GrProcessorUnitTest::kAlphaTextureIdx; |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode |
| : GrTextureParams::kNone_FilterMode); |
| |
| return GrDistanceFieldNoGammaTextureEffect::Create(GrRandomColor(random), textures[texIdx], |
| params, |
| random->nextBool() ? kSimilarity_DistanceFieldEffectFlag : 0, random->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrGLDistanceFieldLCDTextureEffect : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldLCDTextureEffect(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fTextureSize(SkISize::Make(-1,-1)) |
| , fTextColor(GrColor_ILLEGAL) {} |
| |
| virtual void emitCode(const EmitArgs& args) SK_OVERRIDE { |
| const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldLCDTextureEffect>(); |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| GrGLVertToFrag v(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &v); |
| vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // setup coord outputs |
| vsBuilder->codeAppendf("%s = %s;", vsBuilder->positionCoords(), |
| dfTexEffect.inPosition()->fName); |
| vsBuilder->codeAppendf("%s = %s;", vsBuilder->localCoords(), |
| dfTexEffect.inPosition()->fName); |
| |
| // setup position varying |
| vsBuilder->codeAppendf("%s = %s * vec3(%s, 1);", vsBuilder->glPosition(), |
| vsBuilder->uViewM(), dfTexEffect.inPosition()->fName); |
| |
| const char* textureSizeUniName = NULL; |
| // width, height, 1/(3*width) |
| fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec3f_GrSLType, kDefault_GrSLPrecision, |
| "TextureSize", &textureSizeUniName); |
| |
| GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| // create LCD offset adjusted by inverse of transform |
| fsBuilder->codeAppendf("\tvec2 uv = %s;\n", v.fsIn()); |
| fsBuilder->codeAppendf("\tvec2 st = uv*%s.xy;\n", textureSizeUniName); |
| bool isUniformScale = !!(dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask); |
| if (isUniformScale) { |
| fsBuilder->codeAppend("\tfloat dx = dFdx(st.x);\n"); |
| fsBuilder->codeAppendf("\tvec2 offset = vec2(dx*%s.z, 0.0);\n", textureSizeUniName); |
| } else { |
| fsBuilder->codeAppend("\tvec2 Jdx = dFdx(st);\n"); |
| fsBuilder->codeAppend("\tvec2 Jdy = dFdy(st);\n"); |
| fsBuilder->codeAppendf("\tvec2 offset = %s.z*Jdx;\n", textureSizeUniName); |
| } |
| |
| // green is distance to uv center |
| fsBuilder->codeAppend("\tvec4 texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tvec3 distance;\n"); |
| fsBuilder->codeAppend("\tdistance.y = texColor.r;\n"); |
| // red is distance to left offset |
| fsBuilder->codeAppend("\tvec2 uv_adjusted = uv - offset;\n"); |
| fsBuilder->codeAppend("\ttexColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], "uv_adjusted", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tdistance.x = texColor.r;\n"); |
| // blue is distance to right offset |
| fsBuilder->codeAppend("\tuv_adjusted = uv + offset;\n"); |
| fsBuilder->codeAppend("\ttexColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], "uv_adjusted", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tdistance.z = texColor.r;\n"); |
| |
| fsBuilder->codeAppend("\tdistance = " |
| "vec3(" SK_DistanceFieldMultiplier ")*(distance - vec3(" SK_DistanceFieldThreshold"));"); |
| |
| // we adjust for the effect of the transformation on the distance by using |
| // the length of the gradient of the texture coordinates. We use st coordinates |
| // to ensure we're mapping 1:1 from texel space to pixel space. |
| |
| // To be strictly correct, we should compute the anti-aliasing factor separately |
| // for each color component. However, this is only important when using perspective |
| // transformations, and even then using a single factor seems like a reasonable |
| // trade-off between quality and speed. |
| fsBuilder->codeAppend("\tfloat afwidth;\n"); |
| if (isUniformScale) { |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("\tafwidth = abs(" SK_DistanceFieldAAFactor "*dx);\n"); |
| } else { |
| fsBuilder->codeAppend("\tvec2 uv_grad;\n"); |
| if (args.fPB->ctxInfo().caps()->dropsTileOnZeroDivide()) { |
| // this is to compensate for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("\tfloat uv_len2 = dot(uv, uv);\n"); |
| fsBuilder->codeAppend("\tif (uv_len2 < 0.0001) {\n"); |
| fsBuilder->codeAppend("\t\tuv_grad = vec2(0.7071, 0.7071);\n"); |
| fsBuilder->codeAppend("\t} else {\n"); |
| fsBuilder->codeAppend("\t\tuv_grad = uv*inversesqrt(uv_len2);\n"); |
| fsBuilder->codeAppend("\t}\n"); |
| } else { |
| fsBuilder->codeAppend("\tuv_grad = normalize(uv);\n"); |
| } |
| fsBuilder->codeAppend("\tvec2 grad = vec2(uv_grad.x*Jdx.x + uv_grad.y*Jdy.x,\n"); |
| fsBuilder->codeAppend("\t uv_grad.x*Jdx.y + uv_grad.y*Jdy.y);\n"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*length(grad);\n"); |
| } |
| |
| fsBuilder->codeAppend("\tvec4 val = vec4(smoothstep(vec3(-afwidth), vec3(afwidth), distance), 1.0);\n"); |
| |
| // adjust based on gamma |
| const char* textColorUniName = NULL; |
| // width, height, 1/(3*width) |
| fTextColorUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec3f_GrSLType, kDefault_GrSLPrecision, |
| "TextColor", &textColorUniName); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val.x, %s.x);\n", textColorUniName); |
| fsBuilder->codeAppend("\tvec4 gammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tval.x = gammaColor.r;\n"); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val.y, %s.y);\n", textColorUniName); |
| fsBuilder->codeAppend("\tgammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tval.y = gammaColor.r;\n"); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val.z, %s.z);\n", textColorUniName); |
| fsBuilder->codeAppend("\tgammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tval.z = gammaColor.r;\n"); |
| |
| fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| virtual void setData(const GrGLProgramDataManager& pdman, |
| const GrGeometryProcessor& processor, |
| const GrBatchTracker&) SK_OVERRIDE { |
| SkASSERT(fTextureSizeUni.isValid()); |
| SkASSERT(fTextColorUni.isValid()); |
| |
| const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| processor.cast<GrDistanceFieldLCDTextureEffect>(); |
| GrTexture* texture = processor.texture(0); |
| if (texture->width() != fTextureSize.width() || |
| texture->height() != fTextureSize.height()) { |
| fTextureSize = SkISize::Make(texture->width(), texture->height()); |
| float delta = 1.0f/(3.0f*texture->width()); |
| if (dfTexEffect.getFlags() & kBGR_DistanceFieldEffectFlag) { |
| delta = -delta; |
| } |
| pdman.set3f(fTextureSizeUni, |
| SkIntToScalar(fTextureSize.width()), |
| SkIntToScalar(fTextureSize.height()), |
| delta); |
| } |
| |
| GrColor textColor = dfTexEffect.getTextColor(); |
| if (textColor != fTextColor) { |
| static const float ONE_OVER_255 = 1.f / 255.f; |
| pdman.set3f(fTextColorUni, |
| GrColorUnpackR(textColor) * ONE_OVER_255, |
| GrColorUnpackG(textColor) * ONE_OVER_255, |
| GrColorUnpackB(textColor) * ONE_OVER_255); |
| fTextColor = textColor; |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& processor, |
| const GrBatchTracker&, |
| const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| processor.cast<GrDistanceFieldLCDTextureEffect>(); |
| |
| b->add32(dfTexEffect.getFlags()); |
| } |
| |
| private: |
| GrGLProgramDataManager::UniformHandle fTextureSizeUni; |
| SkISize fTextureSize; |
| GrGLProgramDataManager::UniformHandle fTextColorUni; |
| SkColor fTextColor; |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldLCDTextureEffect::GrDistanceFieldLCDTextureEffect( |
| GrColor color, |
| GrTexture* texture, const GrTextureParams& params, |
| GrTexture* gamma, const GrTextureParams& gParams, |
| SkColor textColor, |
| uint32_t flags) |
| : INHERITED(color) |
| , fTextureAccess(texture, params) |
| , fGammaTextureAccess(gamma, gParams) |
| , fTextColor(textColor) |
| , fFlags(flags & kLCD_DistanceFieldEffectMask){ |
| SkASSERT(!(flags & ~kLCD_DistanceFieldEffectMask) && (flags & kUseLCD_DistanceFieldEffectFlag)); |
| this->initClassID<GrDistanceFieldLCDTextureEffect>(); |
| fInPosition = &this->addVertexAttrib(GrAttribute("inPosition", kVec2f_GrVertexAttribType)); |
| fInTextureCoords = &this->addVertexAttrib(GrAttribute("inTextureCoords", |
| kVec2f_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| this->addTextureAccess(&fGammaTextureAccess); |
| } |
| |
| bool GrDistanceFieldLCDTextureEffect::onIsEqual(const GrGeometryProcessor& other) const { |
| const GrDistanceFieldLCDTextureEffect& cte = other.cast<GrDistanceFieldLCDTextureEffect>(); |
| return (fTextColor == cte.fTextColor && |
| fFlags == cte.fFlags); |
| } |
| |
| void GrDistanceFieldLCDTextureEffect::onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const { |
| out->setUnknownFourComponents(); |
| out->setUsingLCDCoverage(); |
| } |
| |
| void GrDistanceFieldLCDTextureEffect::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldLCDTextureEffect::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLGeometryProcessor* |
| GrDistanceFieldLCDTextureEffect::createGLInstance(const GrBatchTracker& bt) const { |
| return SkNEW_ARGS(GrGLDistanceFieldLCDTextureEffect, (*this, bt)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldLCDTextureEffect); |
| |
| GrGeometryProcessor* GrDistanceFieldLCDTextureEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| int texIdx2 = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| GrTextureParams params2(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| GrColor textColor = GrColorPackRGBA(random->nextULessThan(256), |
| random->nextULessThan(256), |
| random->nextULessThan(256), |
| random->nextULessThan(256)); |
| uint32_t flags = kUseLCD_DistanceFieldEffectFlag; |
| flags |= random->nextBool() ? kUniformScale_DistanceFieldEffectMask : 0; |
| flags |= random->nextBool() ? kBGR_DistanceFieldEffectFlag : 0; |
| return GrDistanceFieldLCDTextureEffect::Create(GrRandomColor(random), textures[texIdx], params, |
| textures[texIdx2], params2, |
| textColor, |
| flags); |
| } |
