| /* |
| * 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 "GrInvariantOutput.h" |
| #include "GrTexture.h" |
| |
| #include "SkDistanceFieldGen.h" |
| |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "glsl/GrGLSLGeometryProcessor.h" |
| #include "glsl/GrGLSLProgramDataManager.h" |
| #include "glsl/GrGLSLUniformHandler.h" |
| #include "glsl/GrGLSLUtil.h" |
| #include "glsl/GrGLSLVarying.h" |
| #include "glsl/GrGLSLVertexShaderBuilder.h" |
| |
| // Assuming a radius of a little less than the diagonal of the fragment |
| #define SK_DistanceFieldAAFactor "0.65" |
| |
| class GrGLDistanceFieldA8TextGeoProc : public GrGLSLGeometryProcessor { |
| public: |
| GrGLDistanceFieldA8TextGeoProc() |
| : fViewMatrix(SkMatrix::InvalidMatrix()) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fDistanceAdjust(-1.0f) |
| #endif |
| {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldA8TextGeoProc& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldA8TextGeoProc>(); |
| GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| SkAssertResult(fragBuilder->enableFeature( |
| GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(dfTexEffect); |
| |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust based on gamma |
| const char* distanceAdjustUniName = nullptr; |
| // width, height, 1/(3*width) |
| fDistanceAdjustUni = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kFloat_GrSLType, kDefault_GrSLPrecision, |
| "DistanceAdjust", &distanceAdjustUniName); |
| #endif |
| |
| // Setup pass through color |
| if (!dfTexEffect.colorIgnored()) { |
| varyingHandler->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor); |
| } |
| |
| // Setup position |
| this->setupPosition(vertBuilder, |
| uniformHandler, |
| gpArgs, |
| dfTexEffect.inPosition()->fName, |
| dfTexEffect.viewMatrix(), |
| &fViewMatrixUniform); |
| |
| // emit transforms |
| this->emitTransforms(vertBuilder, |
| varyingHandler, |
| uniformHandler, |
| gpArgs->fPositionVar, |
| dfTexEffect.inPosition()->fName, |
| args.fTransformsIn, |
| args.fTransformsOut); |
| |
| // add varyings |
| GrGLSLVertToFrag recipScale(kFloat_GrSLType); |
| GrGLSLVertToFrag uv(kVec2f_GrSLType); |
| bool isUniformScale = (dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) == |
| kUniformScale_DistanceFieldEffectMask; |
| bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag); |
| bool isGammaCorrect = |
| SkToBool(dfTexEffect.getFlags() & kGammaCorrect_DistanceFieldEffectFlag); |
| varyingHandler->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision); |
| vertBuilder->codeAppendf("%s = %s;", uv.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // compute numbers to be hardcoded to convert texture coordinates from float to int |
| SkASSERT(dfTexEffect.numTextures() == 1); |
| GrTexture* atlas = dfTexEffect.textureAccess(0).getTexture(); |
| SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height())); |
| |
| GrGLSLVertToFrag st(kVec2f_GrSLType); |
| varyingHandler->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision); |
| vertBuilder->codeAppendf("%s = vec2(%d, %d) * %s;", st.vsOut(), |
| atlas->width(), atlas->height(), |
| dfTexEffect.inTextureCoords()->fName); |
| |
| // Use highp to work around aliasing issues |
| fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision); |
| fragBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn()); |
| |
| fragBuilder->codeAppend("\tfloat texColor = "); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], |
| "uv", |
| kVec2f_GrSLType); |
| fragBuilder->codeAppend(".r;\n"); |
| fragBuilder->codeAppend("\tfloat distance = " |
| SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");"); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust width based on gamma |
| fragBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName); |
| #endif |
| |
| fragBuilder->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 t coordinate in the y direction. |
| // We use st coordinates to ensure we're mapping 1:1 from texel space to pixel space. |
| // We use the y gradient because there is a bug in the Mali 400 in the x direction. |
| |
| // this gives us a smooth step across approximately one fragment |
| fragBuilder->codeAppendf("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdy(%s.y));", |
| st.fsIn()); |
| } else if (isSimilarity) { |
| // For similarity transform, we adjust 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. |
| // We use the y gradient because there is a bug in the Mali 400 in the x direction. |
| |
| // this gives us a smooth step across approximately one fragment |
| fragBuilder->codeAppendf("float st_grad_len = length(dFdy(%s));", st.fsIn()); |
| fragBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*st_grad_len);"); |
| } 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. |
| fragBuilder->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 |
| fragBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fragBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fragBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fragBuilder->codeAppend("} else {"); |
| fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fragBuilder->codeAppend("}"); |
| |
| fragBuilder->codeAppendf("vec2 Jdx = dFdx(%s);", st.fsIn()); |
| fragBuilder->codeAppendf("vec2 Jdy = dFdy(%s);", st.fsIn()); |
| fragBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fragBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fragBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| |
| // The smoothstep falloff compensates for the non-linear sRGB response curve. If we are |
| // doing gamma-correct rendering (to an sRGB or F16 buffer), then we actually want distance |
| // mapped linearly to coverage, so use a linear step: |
| if (isGammaCorrect) { |
| fragBuilder->codeAppend( |
| "float val = clamp(distance + afwidth / (2.0 * afwidth), 0.0, 1.0);"); |
| } else { |
| fragBuilder->codeAppend("float val = smoothstep(-afwidth, afwidth, distance);"); |
| } |
| |
| fragBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& proc) 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>(); |
| |
| if (!dfa8gp.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(dfa8gp.viewMatrix())) { |
| fViewMatrix = dfa8gp.viewMatrix(); |
| float viewMatrix[3 * 3]; |
| GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix); |
| pdman.setMatrix3f(fViewMatrixUniform, viewMatrix); |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrGLSLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldA8TextGeoProc& dfTexEffect = gp.cast<GrDistanceFieldA8TextGeoProc>(); |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= dfTexEffect.colorIgnored() << 16; |
| key |= ComputePosKey(dfTexEffect.viewMatrix()) << 25; |
| b->add32(key); |
| |
| // Currently we hardcode numbers to convert atlas coordinates to normalized floating point |
| SkASSERT(gp.numTextures() == 1); |
| GrTexture* atlas = gp.textureAccess(0).getTexture(); |
| SkASSERT(atlas); |
| b->add32(atlas->width()); |
| b->add32(atlas->height()); |
| } |
| |
| private: |
| SkMatrix fViewMatrix; |
| UniformHandle fViewMatrixUniform; |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| float fDistanceAdjust; |
| UniformHandle fDistanceAdjustUni; |
| #endif |
| |
| typedef GrGLSLGeometryProcessor 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(nullptr) |
| , fUsesLocalCoords(usesLocalCoords) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldA8TextGeoProc>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType, |
| kHigh_GrSLPrecision)); |
| fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType)); |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2us_GrVertexAttribType, |
| kHigh_GrSLPrecision)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| void GrDistanceFieldA8TextGeoProc::getGLSLProcessorKey(const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldA8TextGeoProc::GenKey(*this, caps, b); |
| } |
| |
| GrGLSLPrimitiveProcessor* GrDistanceFieldA8TextGeoProc::createGLSLInstance(const GrGLSLCaps&) const { |
| return new GrGLDistanceFieldA8TextGeoProc(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldA8TextGeoProc); |
| |
| const GrGeometryProcessor* GrDistanceFieldA8TextGeoProc::TestCreate(GrProcessorTestData* d) { |
| int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, d->fRandom->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| |
| uint32_t flags = 0; |
| flags |= d->fRandom->nextBool() ? kSimilarity_DistanceFieldEffectFlag : 0; |
| if (flags & kSimilarity_DistanceFieldEffectFlag) { |
| flags |= d->fRandom->nextBool() ? kScaleOnly_DistanceFieldEffectFlag : 0; |
| } |
| |
| return GrDistanceFieldA8TextGeoProc::Create(GrRandomColor(d->fRandom), |
| GrTest::TestMatrix(d->fRandom), |
| d->fTextures[texIdx], params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| d->fRandom->nextF(), |
| #endif |
| flags, |
| d->fRandom->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrGLDistanceFieldPathGeoProc : public GrGLSLGeometryProcessor { |
| public: |
| GrGLDistanceFieldPathGeoProc() |
| : fViewMatrix(SkMatrix::InvalidMatrix()) |
| , fTextureSize(SkISize::Make(-1, -1)) {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldPathGeoProc& dfTexEffect = args.fGP.cast<GrDistanceFieldPathGeoProc>(); |
| |
| GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| SkAssertResult(fragBuilder->enableFeature( |
| GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(dfTexEffect); |
| |
| GrGLSLVertToFrag v(kVec2f_GrSLType); |
| varyingHandler->addVarying("TextureCoords", &v, kHigh_GrSLPrecision); |
| |
| // setup pass through color |
| if (!dfTexEffect.colorIgnored()) { |
| varyingHandler->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor); |
| } |
| vertBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // Setup position |
| this->setupPosition(vertBuilder, |
| uniformHandler, |
| gpArgs, |
| dfTexEffect.inPosition()->fName, |
| dfTexEffect.viewMatrix(), |
| &fViewMatrixUniform); |
| |
| // emit transforms |
| this->emitTransforms(vertBuilder, |
| varyingHandler, |
| uniformHandler, |
| gpArgs->fPositionVar, |
| dfTexEffect.inPosition()->fName, |
| args.fTransformsIn, |
| args.fTransformsOut); |
| |
| const char* textureSizeUniName = nullptr; |
| fTextureSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "TextureSize", &textureSizeUniName); |
| |
| // Use highp to work around aliasing issues |
| fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision); |
| fragBuilder->codeAppendf("vec2 uv = %s;", v.fsIn()); |
| |
| fragBuilder->codeAppend("float texColor = "); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], |
| "uv", |
| kVec2f_GrSLType); |
| fragBuilder->codeAppend(".r;"); |
| fragBuilder->codeAppend("float distance = " |
| SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");"); |
| |
| fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision); |
| fragBuilder->codeAppendf("vec2 st = uv*%s;", textureSizeUniName); |
| fragBuilder->codeAppend("float afwidth;"); |
| bool isUniformScale = (dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) == |
| kUniformScale_DistanceFieldEffectMask; |
| bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag); |
| bool isGammaCorrect = |
| SkToBool(dfTexEffect.getFlags() & kGammaCorrect_DistanceFieldEffectFlag); |
| 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 t coordinate in the y direction. |
| // We use st coordinates to ensure we're mapping 1:1 from texel space to pixel space. |
| // We use the y gradient because there is a bug in the Mali 400 in the x direction. |
| |
| // this gives us a smooth step across approximately one fragment |
| fragBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdy(st.y));"); |
| |
| } else if (isSimilarity) { |
| // For similarity transform, we adjust 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. |
| // We use the y gradient because there is a bug in the Mali 400 in the x direction. |
| |
| // this gives us a smooth step across approximately one fragment |
| fragBuilder->codeAppend("float st_grad_len = length(dFdy(st));"); |
| fragBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*st_grad_len);"); |
| } 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. |
| fragBuilder->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 |
| fragBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fragBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fragBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fragBuilder->codeAppend("} else {"); |
| fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fragBuilder->codeAppend("}"); |
| |
| fragBuilder->codeAppend("vec2 Jdx = dFdx(st);"); |
| fragBuilder->codeAppend("vec2 Jdy = dFdy(st);"); |
| fragBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fragBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fragBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| // The smoothstep falloff compensates for the non-linear sRGB response curve. If we are |
| // doing gamma-correct rendering (to an sRGB or F16 buffer), then we actually want distance |
| // mapped linearly to coverage, so use a linear step: |
| if (isGammaCorrect) { |
| fragBuilder->codeAppend( |
| "float val = clamp(distance + afwidth / (2.0 * afwidth), 0.0, 1.0);"); |
| } else { |
| fragBuilder->codeAppend("float val = smoothstep(-afwidth, afwidth, distance);"); |
| } |
| |
| fragBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& proc) 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>(); |
| |
| if (!dfpgp.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(dfpgp.viewMatrix())) { |
| fViewMatrix = dfpgp.viewMatrix(); |
| float viewMatrix[3 * 3]; |
| GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix); |
| pdman.setMatrix3f(fViewMatrixUniform, viewMatrix); |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrGLSLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldPathGeoProc& dfTexEffect = gp.cast<GrDistanceFieldPathGeoProc>(); |
| |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= dfTexEffect.colorIgnored() << 16; |
| key |= ComputePosKey(dfTexEffect.viewMatrix()) << 25; |
| b->add32(key); |
| } |
| |
| private: |
| UniformHandle fTextureSizeUni; |
| UniformHandle fViewMatrixUniform; |
| SkMatrix fViewMatrix; |
| SkISize fTextureSize; |
| |
| typedef GrGLSLGeometryProcessor 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(nullptr) |
| , fUsesLocalCoords(usesLocalCoords) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldPathGeoProc>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType, |
| kHigh_GrSLPrecision)); |
| fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType)); |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2f_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| void GrDistanceFieldPathGeoProc::getGLSLProcessorKey(const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldPathGeoProc::GenKey(*this, caps, b); |
| } |
| |
| GrGLSLPrimitiveProcessor* GrDistanceFieldPathGeoProc::createGLSLInstance(const GrGLSLCaps&) const { |
| return new GrGLDistanceFieldPathGeoProc(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldPathGeoProc); |
| |
| const GrGeometryProcessor* GrDistanceFieldPathGeoProc::TestCreate(GrProcessorTestData* d) { |
| int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx |
| : GrProcessorUnitTest::kAlphaTextureIdx; |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, d->fRandom->nextBool() ? GrTextureParams::kBilerp_FilterMode |
| : GrTextureParams::kNone_FilterMode); |
| |
| uint32_t flags = 0; |
| flags |= d->fRandom->nextBool() ? kSimilarity_DistanceFieldEffectFlag : 0; |
| if (flags & kSimilarity_DistanceFieldEffectFlag) { |
| flags |= d->fRandom->nextBool() ? kScaleOnly_DistanceFieldEffectFlag : 0; |
| } |
| |
| return GrDistanceFieldPathGeoProc::Create(GrRandomColor(d->fRandom), |
| GrTest::TestMatrix(d->fRandom), |
| d->fTextures[texIdx], |
| params, |
| flags, |
| d->fRandom->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrGLDistanceFieldLCDTextGeoProc : public GrGLSLGeometryProcessor { |
| public: |
| GrGLDistanceFieldLCDTextGeoProc() |
| : fViewMatrix(SkMatrix::InvalidMatrix()) { |
| fDistanceAdjust = GrDistanceFieldLCDTextGeoProc::DistanceAdjust::Make(1.0f, 1.0f, 1.0f); |
| } |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldLCDTextGeoProc& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldLCDTextGeoProc>(); |
| |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(dfTexEffect); |
| |
| GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| |
| // setup pass through color |
| if (!dfTexEffect.colorIgnored()) { |
| varyingHandler->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor); |
| } |
| |
| // Setup position |
| this->setupPosition(vertBuilder, |
| uniformHandler, |
| gpArgs, |
| dfTexEffect.inPosition()->fName, |
| dfTexEffect.viewMatrix(), |
| &fViewMatrixUniform); |
| |
| // emit transforms |
| this->emitTransforms(vertBuilder, |
| varyingHandler, |
| uniformHandler, |
| gpArgs->fPositionVar, |
| dfTexEffect.inPosition()->fName, |
| args.fTransformsIn, |
| args.fTransformsOut); |
| |
| // set up varyings |
| bool isUniformScale = (dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) == |
| kUniformScale_DistanceFieldEffectMask; |
| bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag); |
| bool isGammaCorrect = |
| SkToBool(dfTexEffect.getFlags() & kGammaCorrect_DistanceFieldEffectFlag); |
| GrGLSLVertToFrag recipScale(kFloat_GrSLType); |
| GrGLSLVertToFrag uv(kVec2f_GrSLType); |
| varyingHandler->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision); |
| vertBuilder->codeAppendf("%s = %s;", uv.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // compute numbers to be hardcoded to convert texture coordinates from float to int |
| SkASSERT(dfTexEffect.numTextures() == 1); |
| GrTexture* atlas = dfTexEffect.textureAccess(0).getTexture(); |
| SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height())); |
| |
| GrGLSLVertToFrag st(kVec2f_GrSLType); |
| varyingHandler->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision); |
| vertBuilder->codeAppendf("%s = vec2(%d, %d) * %s;", st.vsOut(), |
| atlas->width(), atlas->height(), |
| dfTexEffect.inTextureCoords()->fName); |
| |
| // add frag shader code |
| |
| SkAssertResult(fragBuilder->enableFeature( |
| GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| // create LCD offset adjusted by inverse of transform |
| // Use highp to work around aliasing issues |
| fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision); |
| fragBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn()); |
| fragBuilder->appendPrecisionModifier(kHigh_GrSLPrecision); |
| |
| SkScalar lcdDelta = 1.0f / (3.0f * atlas->width()); |
| if (dfTexEffect.getFlags() & kBGR_DistanceFieldEffectFlag) { |
| fragBuilder->codeAppendf("float delta = -%.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta); |
| } else { |
| fragBuilder->codeAppendf("float delta = %.*f;\n", SK_FLT_DECIMAL_DIG, lcdDelta); |
| } |
| if (isUniformScale) { |
| fragBuilder->codeAppendf("float st_grad_len = abs(dFdy(%s.y));", st.fsIn()); |
| fragBuilder->codeAppend("vec2 offset = vec2(st_grad_len*delta, 0.0);"); |
| } else if (isSimilarity) { |
| // For a similarity matrix with rotation, the gradient will not be aligned |
| // with the texel coordinate axes, so we need to calculate it. |
| // We use dFdy because of a Mali 400 bug, and rotate -90 degrees to |
| // get the gradient in the x direction. |
| fragBuilder->codeAppendf("vec2 st_grad = dFdy(%s);", st.fsIn()); |
| fragBuilder->codeAppend("float st_grad_len = length(st_grad);"); |
| fragBuilder->codeAppend("vec2 offset = delta*vec2(st_grad.y, -st_grad.x);"); |
| } else { |
| fragBuilder->codeAppendf("vec2 st = %s;\n", st.fsIn()); |
| |
| fragBuilder->codeAppend("vec2 Jdx = dFdx(st);"); |
| fragBuilder->codeAppend("vec2 Jdy = dFdy(st);"); |
| fragBuilder->codeAppend("vec2 offset = delta*Jdx;"); |
| } |
| |
| // green is distance to uv center |
| fragBuilder->codeAppend("\tvec4 texColor = "); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv", kVec2f_GrSLType); |
| fragBuilder->codeAppend(";\n"); |
| fragBuilder->codeAppend("\tvec3 distance;\n"); |
| fragBuilder->codeAppend("\tdistance.y = texColor.r;\n"); |
| // red is distance to left offset |
| fragBuilder->codeAppend("\tvec2 uv_adjusted = uv - offset;\n"); |
| fragBuilder->codeAppend("\ttexColor = "); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv_adjusted", kVec2f_GrSLType); |
| fragBuilder->codeAppend(";\n"); |
| fragBuilder->codeAppend("\tdistance.x = texColor.r;\n"); |
| // blue is distance to right offset |
| fragBuilder->codeAppend("\tuv_adjusted = uv + offset;\n"); |
| fragBuilder->codeAppend("\ttexColor = "); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv_adjusted", kVec2f_GrSLType); |
| fragBuilder->codeAppend(";\n"); |
| fragBuilder->codeAppend("\tdistance.z = texColor.r;\n"); |
| |
| fragBuilder->codeAppend("\tdistance = " |
| "vec3(" SK_DistanceFieldMultiplier ")*(distance - vec3(" SK_DistanceFieldThreshold"));"); |
| |
| // adjust width based on gamma |
| const char* distanceAdjustUniName = nullptr; |
| fDistanceAdjustUni = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec3f_GrSLType, kDefault_GrSLPrecision, |
| "DistanceAdjust", &distanceAdjustUniName); |
| fragBuilder->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. |
| fragBuilder->codeAppend("float afwidth;"); |
| if (isSimilarity) { |
| // For similarity transform (uniform scale-only is a subset of this), 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 |
| fragBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*st_grad_len;"); |
| } 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. |
| fragBuilder->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 |
| fragBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fragBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fragBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fragBuilder->codeAppend("} else {"); |
| fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fragBuilder->codeAppend("}"); |
| fragBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fragBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fragBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| |
| // The smoothstep falloff compensates for the non-linear sRGB response curve. If we are |
| // doing gamma-correct rendering (to an sRGB or F16 buffer), then we actually want distance |
| // mapped linearly to coverage, so use a linear step: |
| if (isGammaCorrect) { |
| fragBuilder->codeAppend("vec4 val = " |
| "vec4(clamp(distance + vec3(afwidth) / vec3(2.0 * afwidth), 0.0, 1.0), 1.0f);"); |
| } else { |
| fragBuilder->codeAppend( |
| "vec4 val = vec4(smoothstep(vec3(-afwidth), vec3(afwidth), distance), 1.0);"); |
| } |
| |
| // set alpha to be max of rgb coverage |
| fragBuilder->codeAppend("val.a = max(max(val.r, val.g), val.b);"); |
| |
| fragBuilder->codeAppendf("%s = val;", args.fOutputCoverage); |
| } |
| |
| void setData(const GrGLSLProgramDataManager& pdman, |
| const GrPrimitiveProcessor& processor) override { |
| SkASSERT(fDistanceAdjustUni.isValid()); |
| |
| const GrDistanceFieldLCDTextGeoProc& dflcd = processor.cast<GrDistanceFieldLCDTextGeoProc>(); |
| GrDistanceFieldLCDTextGeoProc::DistanceAdjust wa = dflcd.getDistanceAdjust(); |
| if (wa != fDistanceAdjust) { |
| pdman.set3f(fDistanceAdjustUni, |
| wa.fR, |
| wa.fG, |
| wa.fB); |
| fDistanceAdjust = wa; |
| } |
| |
| if (!dflcd.viewMatrix().isIdentity() && !fViewMatrix.cheapEqualTo(dflcd.viewMatrix())) { |
| fViewMatrix = dflcd.viewMatrix(); |
| float viewMatrix[3 * 3]; |
| GrGLSLGetMatrix<3>(viewMatrix, fViewMatrix); |
| pdman.setMatrix3f(fViewMatrixUniform, viewMatrix); |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| 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); |
| |
| // Currently we hardcode numbers to convert atlas coordinates to normalized floating point |
| SkASSERT(gp.numTextures() == 1); |
| GrTexture* atlas = gp.textureAccess(0).getTexture(); |
| SkASSERT(atlas); |
| b->add32(atlas->width()); |
| b->add32(atlas->height()); |
| } |
| |
| private: |
| SkMatrix fViewMatrix; |
| UniformHandle fViewMatrixUniform; |
| UniformHandle fColorUniform; |
| GrDistanceFieldLCDTextGeoProc::DistanceAdjust fDistanceAdjust; |
| UniformHandle fDistanceAdjustUni; |
| |
| typedef GrGLSLGeometryProcessor 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, |
| kHigh_GrSLPrecision)); |
| fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType)); |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2us_GrVertexAttribType, |
| kHigh_GrSLPrecision)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| void GrDistanceFieldLCDTextGeoProc::getGLSLProcessorKey(const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldLCDTextGeoProc::GenKey(*this, caps, b); |
| } |
| |
| GrGLSLPrimitiveProcessor* GrDistanceFieldLCDTextGeoProc::createGLSLInstance(const GrGLSLCaps&) const { |
| return new GrGLDistanceFieldLCDTextGeoProc(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldLCDTextGeoProc); |
| |
| const GrGeometryProcessor* GrDistanceFieldLCDTextGeoProc::TestCreate(GrProcessorTestData* d) { |
| int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, d->fRandom->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| DistanceAdjust wa = { 0.0f, 0.1f, -0.1f }; |
| uint32_t flags = kUseLCD_DistanceFieldEffectFlag; |
| flags |= d->fRandom->nextBool() ? kSimilarity_DistanceFieldEffectFlag : 0; |
| if (flags & kSimilarity_DistanceFieldEffectFlag) { |
| flags |= d->fRandom->nextBool() ? kScaleOnly_DistanceFieldEffectFlag : 0; |
| } |
| flags |= d->fRandom->nextBool() ? kBGR_DistanceFieldEffectFlag : 0; |
| return GrDistanceFieldLCDTextGeoProc::Create(GrRandomColor(d->fRandom), |
| GrTest::TestMatrix(d->fRandom), |
| d->fTextures[texIdx], params, |
| wa, |
| flags, |
| d->fRandom->nextBool()); |
| } |