| /* |
| * 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 "GrDistanceFieldGeoProc.h" |
| #include "GrFontAtlasSizes.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 a little less than the diagonal of the fragment |
| #define SK_DistanceFieldAAFactor "0.65" |
| |
| class GrGLDistanceFieldA8TextGeoProc : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldA8TextGeoProc(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fColor(GrColor_ILLEGAL) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fDistanceAdjust(-1.0f) |
| #endif |
| {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldA8TextGeoProc& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldA8TextGeoProc>(); |
| GrGLGPBuilder* pb = args.fPB; |
| GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| |
| // emit attributes |
| vsBuilder->emitAttributes(dfTexEffect); |
| |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust based on gamma |
| const char* distanceAdjustUniName = NULL; |
| // width, height, 1/(3*width) |
| fDistanceAdjustUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, kDefault_GrSLPrecision, |
| "DistanceAdjust", &distanceAdjustUniName); |
| #endif |
| |
| // Setup pass through color |
| if (!dfTexEffect.colorIgnored()) { |
| if (dfTexEffect.hasVertexColor()) { |
| pb->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor); |
| } else { |
| this->setupUniformColor(pb, args.fOutputColor, &fColorUniform); |
| } |
| } |
| |
| // Setup position |
| this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix()); |
| |
| // emit transforms |
| this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName, |
| args.fTransformsIn, args.fTransformsOut); |
| |
| // add varyings |
| GrGLVertToFrag recipScale(kFloat_GrSLType); |
| GrGLVertToFrag st(kVec2f_GrSLType); |
| bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag); |
| args.fPB->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision); |
| vsBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| GrGLVertToFrag uv(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision); |
| // this is only used with text, so our texture bounds always match the glyph atlas |
| vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_A8_RECIP_WIDTH ", " |
| GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", uv.vsOut(), |
| dfTexEffect.inTextureCoords()->fName); |
| |
| // Use highp to work around aliasing issues |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn()); |
| |
| fsBuilder->codeAppend("\tfloat texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], |
| "uv", |
| kVec2f_GrSLType); |
| fsBuilder->codeAppend(".r;\n"); |
| fsBuilder->codeAppend("\tfloat distance = " |
| SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");"); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust width based on gamma |
| fsBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName); |
| #endif |
| |
| fsBuilder->codeAppend("float afwidth;"); |
| if (isSimilarity) { |
| // For uniform scale, 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. |
| |
| // this gives us a smooth step across approximately one fragment |
| // we use y to work around a Mali400 bug in the x direction |
| fsBuilder->codeAppendf("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdy(%s.y));", |
| st.fsIn()); |
| } else { |
| // For general transforms, to determine the amount of correction we multiply a unit |
| // vector pointing along the SDF gradient direction by the Jacobian of the st coords |
| // (which is the inverse transform for this fragment) and take the length of the result. |
| fsBuilder->codeAppend("vec2 dist_grad = vec2(dFdx(distance), dFdy(distance));"); |
| // the length of the gradient may be 0, so we need to check for this |
| // this also compensates for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fsBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fsBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fsBuilder->codeAppend("} else {"); |
| fsBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fsBuilder->codeAppend("}"); |
| |
| fsBuilder->codeAppendf("vec2 Jdx = dFdx(%s);", st.fsIn()); |
| fsBuilder->codeAppendf("vec2 Jdy = dFdy(%s);", st.fsIn()); |
| fsBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fsBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_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 GrPrimitiveProcessor& proc, |
| const GrBatchTracker& bt) override { |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| const GrDistanceFieldA8TextGeoProc& dfTexEffect = proc.cast<GrDistanceFieldA8TextGeoProc>(); |
| float distanceAdjust = dfTexEffect.getDistanceAdjust(); |
| if (distanceAdjust != fDistanceAdjust) { |
| pdman.set1f(fDistanceAdjustUni, distanceAdjust); |
| fDistanceAdjust = distanceAdjust; |
| } |
| #endif |
| |
| const GrDistanceFieldA8TextGeoProc& dfa8gp = proc.cast<GrDistanceFieldA8TextGeoProc>(); |
| this->setUniformViewMatrix(pdman, dfa8gp.viewMatrix()); |
| |
| if (dfa8gp.color() != fColor && !dfa8gp.hasVertexColor()) { |
| GrGLfloat c[4]; |
| GrColorToRGBAFloat(dfa8gp.color(), c); |
| pdman.set4fv(fColorUniform, 1, c); |
| fColor = dfa8gp.color(); |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrBatchTracker& bt, |
| const GrGLSLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldA8TextGeoProc& dfTexEffect = gp.cast<GrDistanceFieldA8TextGeoProc>(); |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= dfTexEffect.hasVertexColor() << 16; |
| key |= dfTexEffect.colorIgnored() << 17; |
| key |= ComputePosKey(dfTexEffect.viewMatrix()) << 25; |
| b->add32(key); |
| } |
| |
| private: |
| GrColor fColor; |
| UniformHandle fColorUniform; |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| float fDistanceAdjust; |
| UniformHandle fDistanceAdjustUni; |
| #endif |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldA8TextGeoProc::GrDistanceFieldA8TextGeoProc(GrColor color, |
| const SkMatrix& viewMatrix, |
| GrTexture* texture, |
| const GrTextureParams& params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| float distanceAdjust, |
| #endif |
| uint32_t flags, |
| bool usesLocalCoords) |
| : fColor(color) |
| , fViewMatrix(viewMatrix) |
| , fTextureAccess(texture, params) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fDistanceAdjust(distanceAdjust) |
| #endif |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) |
| , fInColor(NULL) |
| , fUsesLocalCoords(usesLocalCoords) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldA8TextGeoProc>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); |
| if (flags & kColorAttr_DistanceFieldEffectFlag) { |
| fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType)); |
| } |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2s_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| void GrDistanceFieldA8TextGeoProc::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldA8TextGeoProc::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLPrimitiveProcessor* |
| GrDistanceFieldA8TextGeoProc::createGLInstance(const GrBatchTracker& bt, |
| const GrGLSLCaps&) const { |
| return SkNEW_ARGS(GrGLDistanceFieldA8TextGeoProc, (*this, bt)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldA8TextGeoProc); |
| |
| GrGeometryProcessor* GrDistanceFieldA8TextGeoProc::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrCaps&, |
| 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 GrDistanceFieldA8TextGeoProc::Create(GrRandomColor(random), |
| GrTest::TestMatrix(random), |
| textures[texIdx], params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| random->nextF(), |
| #endif |
| random->nextBool() ? |
| kSimilarity_DistanceFieldEffectFlag : 0, |
| random->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrGLDistanceFieldPathGeoProc : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldPathGeoProc(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fColor(GrColor_ILLEGAL), fTextureSize(SkISize::Make(-1, -1)) {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldPathGeoProc& dfTexEffect = args.fGP.cast<GrDistanceFieldPathGeoProc>(); |
| |
| GrGLGPBuilder* pb = args.fPB; |
| GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| |
| // emit attributes |
| vsBuilder->emitAttributes(dfTexEffect); |
| |
| GrGLVertToFrag v(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &v, kHigh_GrSLPrecision); |
| |
| // setup pass through color |
| if (!dfTexEffect.colorIgnored()) { |
| if (dfTexEffect.hasVertexColor()) { |
| pb->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor); |
| } else { |
| this->setupUniformColor(pb, args.fOutputColor, &fColorUniform); |
| } |
| } |
| vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // Setup position |
| this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix()); |
| |
| // emit transforms |
| this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName, |
| args.fTransformsIn, args.fTransformsOut); |
| |
| const char* textureSizeUniName = NULL; |
| fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "TextureSize", &textureSizeUniName); |
| |
| // Use highp to work around aliasing issues |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 uv = %s;", v.fsIn()); |
| |
| fsBuilder->codeAppend("float texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], |
| "uv", |
| kVec2f_GrSLType); |
| fsBuilder->codeAppend(".r;"); |
| fsBuilder->codeAppend("float distance = " |
| SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");"); |
| |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 st = uv*%s;", textureSizeUniName); |
| fsBuilder->codeAppend("float afwidth;"); |
| if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) { |
| // For uniform scale, 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. |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdy(st.y));"); |
| } else { |
| // For general transforms, to determine the amount of correction we multiply a unit |
| // vector pointing along the SDF gradient direction by the Jacobian of the st coords |
| // (which is the inverse transform for this fragment) and take the length of the result. |
| fsBuilder->codeAppend("vec2 dist_grad = vec2(dFdx(distance), dFdy(distance));"); |
| // the length of the gradient may be 0, so we need to check for this |
| // this also compensates for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fsBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fsBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fsBuilder->codeAppend("} else {"); |
| fsBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fsBuilder->codeAppend("}"); |
| |
| fsBuilder->codeAppend("vec2 Jdx = dFdx(st);"); |
| fsBuilder->codeAppend("vec2 Jdy = dFdy(st);"); |
| fsBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fsBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_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 GrPrimitiveProcessor& proc, |
| const GrBatchTracker& bt) 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())); |
| } |
| |
| const GrDistanceFieldPathGeoProc& dfpgp = proc.cast<GrDistanceFieldPathGeoProc>(); |
| this->setUniformViewMatrix(pdman, dfpgp.viewMatrix()); |
| |
| if (dfpgp.color() != fColor) { |
| GrGLfloat c[4]; |
| GrColorToRGBAFloat(dfpgp.color(), c); |
| pdman.set4fv(fColorUniform, 1, c); |
| fColor = dfpgp.color(); |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrBatchTracker& bt, |
| const GrGLSLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldPathGeoProc& dfTexEffect = gp.cast<GrDistanceFieldPathGeoProc>(); |
| |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= dfTexEffect.colorIgnored() << 16; |
| key |= dfTexEffect.hasVertexColor() << 17; |
| key |= ComputePosKey(dfTexEffect.viewMatrix()) << 25; |
| b->add32(key); |
| } |
| |
| private: |
| UniformHandle fColorUniform; |
| UniformHandle fTextureSizeUni; |
| GrColor fColor; |
| SkISize fTextureSize; |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldPathGeoProc::GrDistanceFieldPathGeoProc( |
| GrColor color, |
| const SkMatrix& viewMatrix, |
| GrTexture* texture, |
| const GrTextureParams& params, |
| uint32_t flags, |
| bool usesLocalCoords) |
| : fColor(color) |
| , fViewMatrix(viewMatrix) |
| , fTextureAccess(texture, params) |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) |
| , fInColor(NULL) |
| , fUsesLocalCoords(usesLocalCoords) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldPathGeoProc>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); |
| if (flags & kColorAttr_DistanceFieldEffectFlag) { |
| fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType)); |
| } |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2f_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| void GrDistanceFieldPathGeoProc::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldPathGeoProc::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLPrimitiveProcessor* |
| GrDistanceFieldPathGeoProc::createGLInstance(const GrBatchTracker& bt, const GrGLSLCaps&) const { |
| return SkNEW_ARGS(GrGLDistanceFieldPathGeoProc, (*this, bt)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldPathGeoProc); |
| |
| GrGeometryProcessor* GrDistanceFieldPathGeoProc::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrCaps&, |
| 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 GrDistanceFieldPathGeoProc::Create(GrRandomColor(random), |
| GrTest::TestMatrix(random), |
| textures[texIdx], |
| params, |
| random->nextBool() ? |
| kSimilarity_DistanceFieldEffectFlag : 0, |
| random->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrGLDistanceFieldLCDTextGeoProc : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldLCDTextGeoProc(const GrGeometryProcessor&, const GrBatchTracker&) |
| : fColor(GrColor_ILLEGAL) { |
| fDistanceAdjust = GrDistanceFieldLCDTextGeoProc::DistanceAdjust::Make(1.0f, 1.0f, 1.0f); |
| } |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldLCDTextGeoProc& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldLCDTextGeoProc>(); |
| GrGLGPBuilder* pb = args.fPB; |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| |
| // emit attributes |
| vsBuilder->emitAttributes(dfTexEffect); |
| |
| // setup pass through color |
| if (!dfTexEffect.colorIgnored()) { |
| this->setupUniformColor(pb, args.fOutputColor, &fColorUniform); |
| } |
| |
| // Setup position |
| this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix()); |
| |
| // emit transforms |
| this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName, |
| args.fTransformsIn, args.fTransformsOut); |
| |
| // set up varyings |
| bool isUniformScale = SkToBool(dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask); |
| GrGLVertToFrag recipScale(kFloat_GrSLType); |
| GrGLVertToFrag st(kVec2f_GrSLType); |
| args.fPB->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision); |
| vsBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| GrGLVertToFrag uv(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision); |
| // this is only used with text, so our texture bounds always match the glyph atlas |
| vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_A8_RECIP_WIDTH ", " |
| GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", uv.vsOut(), |
| dfTexEffect.inTextureCoords()->fName); |
| |
| // add frag shader code |
| GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| // create LCD offset adjusted by inverse of transform |
| // Use highp to work around aliasing issues |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn()); |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| if (dfTexEffect.getFlags() & kBGR_DistanceFieldEffectFlag) { |
| fsBuilder->codeAppend("float delta = -" GR_FONT_ATLAS_LCD_DELTA ";\n"); |
| } else { |
| fsBuilder->codeAppend("float delta = " GR_FONT_ATLAS_LCD_DELTA ";\n"); |
| } |
| if (isUniformScale) { |
| fsBuilder->codeAppendf("float dy = abs(dFdy(%s.y));", st.fsIn()); |
| fsBuilder->codeAppend("vec2 offset = vec2(dy*delta, 0.0);"); |
| } else { |
| fsBuilder->codeAppendf("vec2 st = %s;\n", st.fsIn()); |
| |
| fsBuilder->codeAppend("vec2 Jdx = dFdx(st);"); |
| fsBuilder->codeAppend("vec2 Jdy = dFdy(st);"); |
| fsBuilder->codeAppend("vec2 offset = delta*Jdx;"); |
| } |
| |
| // 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"));"); |
| |
| // adjust width based on gamma |
| const char* distanceAdjustUniName = NULL; |
| fDistanceAdjustUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec3f_GrSLType, kDefault_GrSLPrecision, |
| "DistanceAdjust", &distanceAdjustUniName); |
| fsBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName); |
| |
| // 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("float afwidth;"); |
| if (isUniformScale) { |
| // For uniform scale, 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. |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*dy;"); |
| } else { |
| // For general transforms, to determine the amount of correction we multiply a unit |
| // vector pointing along the SDF gradient direction by the Jacobian of the st coords |
| // (which is the inverse transform for this fragment) and take the length of the result. |
| fsBuilder->codeAppend("vec2 dist_grad = vec2(dFdx(distance.r), dFdy(distance.r));"); |
| // the length of the gradient may be 0, so we need to check for this |
| // this also compensates for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fsBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fsBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fsBuilder->codeAppend("} else {"); |
| fsBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fsBuilder->codeAppend("}"); |
| fsBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fsBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| |
| fsBuilder->codeAppend( |
| "vec4 val = vec4(smoothstep(vec3(-afwidth), vec3(afwidth), distance), 1.0);"); |
| |
| fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| virtual void setData(const GrGLProgramDataManager& pdman, |
| const GrPrimitiveProcessor& processor, |
| const GrBatchTracker& bt) override { |
| SkASSERT(fDistanceAdjustUni.isValid()); |
| |
| const GrDistanceFieldLCDTextGeoProc& dfTexEffect = |
| processor.cast<GrDistanceFieldLCDTextGeoProc>(); |
| GrDistanceFieldLCDTextGeoProc::DistanceAdjust wa = dfTexEffect.getDistanceAdjust(); |
| if (wa != fDistanceAdjust) { |
| pdman.set3f(fDistanceAdjustUni, |
| wa.fR, |
| wa.fG, |
| wa.fB); |
| fDistanceAdjust = wa; |
| } |
| |
| this->setUniformViewMatrix(pdman, dfTexEffect.viewMatrix()); |
| |
| if (dfTexEffect.color() != fColor) { |
| GrGLfloat c[4]; |
| GrColorToRGBAFloat(dfTexEffect.color(), c); |
| pdman.set4fv(fColorUniform, 1, c); |
| fColor = dfTexEffect.color(); |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrBatchTracker& bt, |
| const GrGLSLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldLCDTextGeoProc& dfTexEffect = gp.cast<GrDistanceFieldLCDTextGeoProc>(); |
| |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= dfTexEffect.colorIgnored() << 16; |
| key |= ComputePosKey(dfTexEffect.viewMatrix()) << 25; |
| b->add32(key); |
| } |
| |
| private: |
| GrColor fColor; |
| UniformHandle fColorUniform; |
| GrDistanceFieldLCDTextGeoProc::DistanceAdjust fDistanceAdjust; |
| UniformHandle fDistanceAdjustUni; |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldLCDTextGeoProc::GrDistanceFieldLCDTextGeoProc( |
| GrColor color, const SkMatrix& viewMatrix, |
| GrTexture* texture, const GrTextureParams& params, |
| DistanceAdjust distanceAdjust, |
| uint32_t flags, bool usesLocalCoords) |
| : fColor(color) |
| , fViewMatrix(viewMatrix) |
| , fTextureAccess(texture, params) |
| , fDistanceAdjust(distanceAdjust) |
| , fFlags(flags & kLCD_DistanceFieldEffectMask) |
| , fUsesLocalCoords(usesLocalCoords) { |
| SkASSERT(!(flags & ~kLCD_DistanceFieldEffectMask) && (flags & kUseLCD_DistanceFieldEffectFlag)); |
| this->initClassID<GrDistanceFieldLCDTextGeoProc>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2s_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| void GrDistanceFieldLCDTextGeoProc::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldLCDTextGeoProc::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLPrimitiveProcessor* |
| GrDistanceFieldLCDTextGeoProc::createGLInstance(const GrBatchTracker& bt, |
| const GrGLSLCaps&) const { |
| return SkNEW_ARGS(GrGLDistanceFieldLCDTextGeoProc, (*this, bt)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldLCDTextGeoProc); |
| |
| GrGeometryProcessor* GrDistanceFieldLCDTextGeoProc::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrCaps&, |
| 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); |
| DistanceAdjust wa = { 0.0f, 0.1f, -0.1f }; |
| uint32_t flags = kUseLCD_DistanceFieldEffectFlag; |
| flags |= random->nextBool() ? kUniformScale_DistanceFieldEffectMask : 0; |
| flags |= random->nextBool() ? kBGR_DistanceFieldEffectFlag : 0; |
| return GrDistanceFieldLCDTextGeoProc::Create(GrRandomColor(random), |
| GrTest::TestMatrix(random), |
| textures[texIdx], params, |
| wa, |
| flags, |
| random->nextBool()); |
| } |
