| /* |
| * 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 "src/core/SkDistanceFieldGen.h" |
| #include "src/gpu/GrCaps.h" |
| #include "src/gpu/GrShaderCaps.h" |
| #include "src/gpu/GrTexture.h" |
| #include "src/gpu/KeyBuilder.h" |
| #include "src/gpu/effects/GrAtlasedShaderHelpers.h" |
| #include "src/gpu/effects/GrDistanceFieldGeoProc.h" |
| #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "src/gpu/glsl/GrGLSLProgramDataManager.h" |
| #include "src/gpu/glsl/GrGLSLUniformHandler.h" |
| #include "src/gpu/glsl/GrGLSLVarying.h" |
| #include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h" |
| |
| // Assuming a radius of a little less than the diagonal of the fragment |
| #define SK_DistanceFieldAAFactor "0.65" |
| |
| class GrDistanceFieldA8TextGeoProc::Impl : public ProgramImpl { |
| public: |
| void setData(const GrGLSLProgramDataManager& pdman, |
| const GrShaderCaps& shaderCaps, |
| const GrGeometryProcessor& geomProc) override { |
| const GrDistanceFieldA8TextGeoProc& dfa8gp = geomProc.cast<GrDistanceFieldA8TextGeoProc>(); |
| |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| float distanceAdjust = dfa8gp.fDistanceAdjust; |
| if (distanceAdjust != fDistanceAdjust) { |
| fDistanceAdjust = distanceAdjust; |
| pdman.set1f(fDistanceAdjustUni, distanceAdjust); |
| } |
| #endif |
| |
| const SkISize& atlasDimensions = dfa8gp.fAtlasDimensions; |
| SkASSERT(SkIsPow2(atlasDimensions.fWidth) && SkIsPow2(atlasDimensions.fHeight)); |
| |
| if (fAtlasDimensions != atlasDimensions) { |
| pdman.set2f(fAtlasDimensionsInvUniform, |
| 1.0f / atlasDimensions.fWidth, |
| 1.0f / atlasDimensions.fHeight); |
| fAtlasDimensions = atlasDimensions; |
| } |
| SetTransform(pdman, shaderCaps, fLocalMatrixUniform, dfa8gp.fLocalMatrix, &fLocalMatrix); |
| } |
| |
| private: |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldA8TextGeoProc& dfTexEffect = |
| args.fGeomProc.cast<GrDistanceFieldA8TextGeoProc>(); |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(dfTexEffect); |
| |
| const char* atlasDimensionsInvName; |
| fAtlasDimensionsInvUniform = uniformHandler->addUniform(nullptr, |
| kVertex_GrShaderFlag, |
| SkSLType::kFloat2, |
| "AtlasDimensionsInv", |
| &atlasDimensionsInvName); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust based on gamma |
| const char* distanceAdjustUniName = nullptr; |
| // width, height, 1/(3*width) |
| fDistanceAdjustUni = uniformHandler->addUniform(nullptr, kFragment_GrShaderFlag, |
| SkSLType::kHalf, "DistanceAdjust", |
| &distanceAdjustUniName); |
| #endif |
| |
| // Setup pass through color |
| fragBuilder->codeAppendf("half4 %s;\n", args.fOutputColor); |
| varyingHandler->addPassThroughAttribute(dfTexEffect.fInColor.asShaderVar(), |
| args.fOutputColor); |
| |
| // Setup position |
| gpArgs->fPositionVar = dfTexEffect.fInPosition.asShaderVar(); |
| WriteLocalCoord(vertBuilder, |
| uniformHandler, |
| *args.fShaderCaps, |
| gpArgs, |
| gpArgs->fPositionVar, |
| dfTexEffect.fLocalMatrix, |
| &fLocalMatrixUniform); |
| |
| // add varyings |
| GrGLSLVarying uv, texIdx, st; |
| append_index_uv_varyings(args, |
| dfTexEffect.numTextureSamplers(), |
| dfTexEffect.fInTextureCoords.name(), |
| atlasDimensionsInvName, |
| &uv, |
| &texIdx, |
| &st); |
| |
| bool isUniformScale = (dfTexEffect.fFlags & kUniformScale_DistanceFieldEffectMask) == |
| kUniformScale_DistanceFieldEffectMask; |
| bool isSimilarity = SkToBool(dfTexEffect.fFlags & kSimilarity_DistanceFieldEffectFlag ); |
| bool isGammaCorrect = SkToBool(dfTexEffect.fFlags & kGammaCorrect_DistanceFieldEffectFlag); |
| bool isAliased = SkToBool(dfTexEffect.fFlags & kAliased_DistanceFieldEffectFlag ); |
| |
| // Use highp to work around aliasing issues |
| fragBuilder->codeAppendf("float2 uv = %s;\n", uv.fsIn()); |
| fragBuilder->codeAppend("half4 texColor;"); |
| append_multitexture_lookup(args, dfTexEffect.numTextureSamplers(), |
| texIdx, "uv", "texColor"); |
| |
| fragBuilder->codeAppend("half distance = " |
| SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ");"); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust width based on gamma |
| fragBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName); |
| #endif |
| |
| fragBuilder->codeAppend("half 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. |
| |
| // this gives us a smooth step across approximately one fragment |
| if (args.fShaderCaps->avoidDfDxForGradientsWhenPossible()) { |
| fragBuilder->codeAppendf( |
| "afwidth = abs(" SK_DistanceFieldAAFactor "*half(dFdy(%s.y)));", st.fsIn()); |
| } else { |
| fragBuilder->codeAppendf( |
| "afwidth = abs(" SK_DistanceFieldAAFactor "*half(dFdx(%s.x)));", 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 |
| if (args.fShaderCaps->avoidDfDxForGradientsWhenPossible()) { |
| fragBuilder->codeAppendf("half st_grad_len = length(half2(dFdy(%s)));", st.fsIn()); |
| } else { |
| fragBuilder->codeAppendf("half st_grad_len = length(half2(dFdx(%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("half2 dist_grad = half2(float2(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("half dg_len2 = dot(dist_grad, dist_grad);"); |
| fragBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);"); |
| fragBuilder->codeAppend("} else {"); |
| fragBuilder->codeAppend("dist_grad = dist_grad*half(inversesqrt(dg_len2));"); |
| fragBuilder->codeAppend("}"); |
| |
| fragBuilder->codeAppendf("half2 Jdx = half2(dFdx(%s));", st.fsIn()); |
| fragBuilder->codeAppendf("half2 Jdy = half2(dFdy(%s));", st.fsIn()); |
| fragBuilder->codeAppend("half2 grad = half2(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);"); |
| } |
| |
| if (isAliased) { |
| fragBuilder->codeAppend("half val = distance > 0 ? 1.0 : 0.0;"); |
| } else if (isGammaCorrect) { |
| // 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: |
| fragBuilder->codeAppend( |
| "half val = saturate((distance + afwidth) / (2.0 * afwidth));"); |
| } else { |
| fragBuilder->codeAppend("half val = smoothstep(-afwidth, afwidth, distance);"); |
| } |
| |
| fragBuilder->codeAppendf("half4 %s = half4(val);", args.fOutputCoverage); |
| } |
| |
| private: |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| float fDistanceAdjust = -1.f; |
| #endif |
| SkISize fAtlasDimensions = {-1, -1}; |
| SkMatrix fLocalMatrix = SkMatrix::InvalidMatrix(); |
| |
| UniformHandle fDistanceAdjustUni; |
| UniformHandle fAtlasDimensionsInvUniform; |
| UniformHandle fLocalMatrixUniform; |
| |
| using INHERITED = ProgramImpl; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldA8TextGeoProc::GrDistanceFieldA8TextGeoProc(const GrShaderCaps& caps, |
| const GrSurfaceProxyView* views, |
| int numViews, |
| GrSamplerState params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| float distanceAdjust, |
| #endif |
| uint32_t flags, |
| const SkMatrix& localMatrix) |
| : INHERITED(kGrDistanceFieldA8TextGeoProc_ClassID) |
| , fLocalMatrix(localMatrix) |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fDistanceAdjust(distanceAdjust) |
| #endif |
| { |
| SkASSERT(numViews <= kMaxTextures); |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| |
| if (flags & kPerspective_DistanceFieldEffectFlag) { |
| fInPosition = {"inPosition", kFloat3_GrVertexAttribType, SkSLType::kFloat3}; |
| } else { |
| fInPosition = {"inPosition", kFloat2_GrVertexAttribType, SkSLType::kFloat2}; |
| } |
| fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, SkSLType::kHalf4 }; |
| fInTextureCoords = {"inTextureCoords", kUShort2_GrVertexAttribType, |
| caps.integerSupport() ? SkSLType::kUShort2 : SkSLType::kFloat2}; |
| this->setVertexAttributesWithImplicitOffsets(&fInPosition, 3); |
| |
| if (numViews) { |
| fAtlasDimensions = views[0].proxy()->dimensions(); |
| } |
| for (int i = 0; i < numViews; ++i) { |
| const GrSurfaceProxy* proxy = views[i].proxy(); |
| SkASSERT(proxy); |
| SkASSERT(proxy->dimensions() == fAtlasDimensions); |
| fTextureSamplers[i].reset(params, proxy->backendFormat(), views[i].swizzle()); |
| } |
| this->setTextureSamplerCnt(numViews); |
| } |
| |
| void GrDistanceFieldA8TextGeoProc::addNewViews(const GrSurfaceProxyView* views, |
| int numViews, |
| GrSamplerState params) { |
| SkASSERT(numViews <= kMaxTextures); |
| // Just to make sure we don't try to add too many proxies |
| numViews = std::min(numViews, kMaxTextures); |
| |
| if (!fTextureSamplers[0].isInitialized()) { |
| fAtlasDimensions = views[0].proxy()->dimensions(); |
| } |
| |
| for (int i = 0; i < numViews; ++i) { |
| const GrSurfaceProxy* proxy = views[i].proxy(); |
| SkASSERT(proxy); |
| SkASSERT(proxy->dimensions() == fAtlasDimensions); |
| if (!fTextureSamplers[i].isInitialized()) { |
| fTextureSamplers[i].reset(params, proxy->backendFormat(), views[i].swizzle()); |
| } |
| } |
| this->setTextureSamplerCnt(numViews); |
| } |
| |
| void GrDistanceFieldA8TextGeoProc::addToKey(const GrShaderCaps& caps, |
| skgpu::KeyBuilder* b) const { |
| uint32_t key = 0; |
| key |= fFlags; |
| key |= ProgramImpl::ComputeMatrixKey(caps, fLocalMatrix) << 16; |
| b->add32(key); |
| b->add32(this->numTextureSamplers()); |
| } |
| |
| std::unique_ptr<GrGeometryProcessor::ProgramImpl> GrDistanceFieldA8TextGeoProc::makeProgramImpl( |
| const GrShaderCaps&) const { |
| return std::make_unique<Impl>(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldA8TextGeoProc); |
| |
| #if GR_TEST_UTILS |
| GrGeometryProcessor* GrDistanceFieldA8TextGeoProc::TestCreate(GrProcessorTestData* d) { |
| auto [view, ct, at] = d->randomAlphaOnlyView(); |
| |
| GrSamplerState::WrapMode wrapModes[2]; |
| GrTest::TestWrapModes(d->fRandom, wrapModes); |
| GrSamplerState samplerState(wrapModes, d->fRandom->nextBool() |
| ? GrSamplerState::Filter::kLinear |
| : GrSamplerState::Filter::kNearest); |
| |
| uint32_t flags = 0; |
| flags |= d->fRandom->nextBool() ? kSimilarity_DistanceFieldEffectFlag : 0; |
| if (flags & kSimilarity_DistanceFieldEffectFlag) { |
| flags |= d->fRandom->nextBool() ? kScaleOnly_DistanceFieldEffectFlag : 0; |
| } |
| SkMatrix localMatrix = GrTest::TestMatrix(d->fRandom); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| float lum = d->fRandom->nextF(); |
| #endif |
| return GrDistanceFieldA8TextGeoProc::Make(d->allocator(), *d->caps()->shaderCaps(), |
| &view, 1, |
| samplerState, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| lum, |
| #endif |
| flags, localMatrix); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrDistanceFieldPathGeoProc::Impl : public ProgramImpl { |
| public: |
| void setData(const GrGLSLProgramDataManager& pdman, |
| const GrShaderCaps& shaderCaps, |
| const GrGeometryProcessor& geomProc) override { |
| const GrDistanceFieldPathGeoProc& dfpgp = geomProc.cast<GrDistanceFieldPathGeoProc>(); |
| |
| // We always set the matrix uniform; it's either used to transform from local to device |
| // for the output position, or from device to local for the local coord variable. |
| SetTransform(pdman, shaderCaps, fMatrixUniform, dfpgp.fMatrix, &fMatrix); |
| |
| const SkISize& atlasDimensions = dfpgp.fAtlasDimensions; |
| SkASSERT(SkIsPow2(atlasDimensions.fWidth) && SkIsPow2(atlasDimensions.fHeight)); |
| if (fAtlasDimensions != atlasDimensions) { |
| pdman.set2f(fAtlasDimensionsInvUniform, |
| 1.0f / atlasDimensions.fWidth, |
| 1.0f / atlasDimensions.fHeight); |
| fAtlasDimensions = atlasDimensions; |
| } |
| } |
| |
| private: |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{ |
| const GrDistanceFieldPathGeoProc& dfPathEffect = |
| args.fGeomProc.cast<GrDistanceFieldPathGeoProc>(); |
| |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(dfPathEffect); |
| |
| const char* atlasDimensionsInvName; |
| fAtlasDimensionsInvUniform = uniformHandler->addUniform(nullptr, |
| kVertex_GrShaderFlag, |
| SkSLType::kFloat2, |
| "AtlasDimensionsInv", |
| &atlasDimensionsInvName); |
| |
| GrGLSLVarying uv, texIdx, st; |
| append_index_uv_varyings(args, |
| dfPathEffect.numTextureSamplers(), |
| dfPathEffect.fInTextureCoords.name(), |
| atlasDimensionsInvName, |
| &uv, |
| &texIdx, |
| &st); |
| |
| // setup pass through color |
| fragBuilder->codeAppendf("half4 %s;", args.fOutputColor); |
| varyingHandler->addPassThroughAttribute(dfPathEffect.fInColor.asShaderVar(), |
| args.fOutputColor); |
| |
| if (dfPathEffect.fMatrix.hasPerspective()) { |
| // Setup position (output position is transformed, local coords are pass through) |
| WriteOutputPosition(vertBuilder, |
| uniformHandler, |
| *args.fShaderCaps, |
| gpArgs, |
| dfPathEffect.fInPosition.name(), |
| dfPathEffect.fMatrix, |
| &fMatrixUniform); |
| gpArgs->fLocalCoordVar = dfPathEffect.fInPosition.asShaderVar(); |
| } else { |
| // Setup position (output position is pass through, local coords are transformed) |
| WriteOutputPosition(vertBuilder, gpArgs, dfPathEffect.fInPosition.name()); |
| WriteLocalCoord(vertBuilder, |
| uniformHandler, |
| *args.fShaderCaps, |
| gpArgs, |
| dfPathEffect.fInPosition.asShaderVar(), |
| dfPathEffect.fMatrix, |
| &fMatrixUniform); |
| } |
| |
| // Use highp to work around aliasing issues |
| fragBuilder->codeAppendf("float2 uv = %s;", uv.fsIn()); |
| fragBuilder->codeAppend("half4 texColor;"); |
| append_multitexture_lookup(args, dfPathEffect.numTextureSamplers(), texIdx, "uv", |
| "texColor"); |
| |
| fragBuilder->codeAppend("half distance = " |
| SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ");"); |
| |
| fragBuilder->codeAppend("half afwidth;"); |
| bool isUniformScale = (dfPathEffect.fFlags & kUniformScale_DistanceFieldEffectMask) == |
| kUniformScale_DistanceFieldEffectMask; |
| bool isSimilarity = SkToBool(dfPathEffect.fFlags & kSimilarity_DistanceFieldEffectFlag ); |
| bool isGammaCorrect = SkToBool(dfPathEffect.fFlags & 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. |
| |
| // this gives us a smooth step across approximately one fragment |
| if (args.fShaderCaps->avoidDfDxForGradientsWhenPossible()) { |
| fragBuilder->codeAppendf( |
| "afwidth = abs(" SK_DistanceFieldAAFactor "*half(dFdy(%s.y)));", st.fsIn()); |
| } else { |
| fragBuilder->codeAppendf( |
| "afwidth = abs(" SK_DistanceFieldAAFactor "*half(dFdx(%s.x)));", 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. |
| |
| // this gives us a smooth step across approximately one fragment |
| if (args.fShaderCaps->avoidDfDxForGradientsWhenPossible()) { |
| fragBuilder->codeAppendf("half st_grad_len = half(length(dFdy(%s)));", st.fsIn()); |
| } else { |
| fragBuilder->codeAppendf("half st_grad_len = half(length(dFdx(%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("half2 dist_grad = half2(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("half dg_len2 = dot(dist_grad, dist_grad);"); |
| fragBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);"); |
| fragBuilder->codeAppend("} else {"); |
| fragBuilder->codeAppend("dist_grad = dist_grad*half(inversesqrt(dg_len2));"); |
| fragBuilder->codeAppend("}"); |
| |
| fragBuilder->codeAppendf("half2 Jdx = half2(dFdx(%s));", st.fsIn()); |
| fragBuilder->codeAppendf("half2 Jdy = half2(dFdy(%s));", st.fsIn()); |
| fragBuilder->codeAppend("half2 grad = half2(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( |
| "half val = saturate((distance + afwidth) / (2.0 * afwidth));"); |
| } else { |
| fragBuilder->codeAppend("half val = smoothstep(-afwidth, afwidth, distance);"); |
| } |
| |
| fragBuilder->codeAppendf("half4 %s = half4(val);", args.fOutputCoverage); |
| } |
| |
| SkMatrix fMatrix; // view matrix if perspective, local matrix otherwise |
| UniformHandle fMatrixUniform; |
| |
| SkISize fAtlasDimensions; |
| UniformHandle fAtlasDimensionsInvUniform; |
| |
| using INHERITED = ProgramImpl; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldPathGeoProc::GrDistanceFieldPathGeoProc(const GrShaderCaps& caps, |
| const SkMatrix& matrix, |
| bool wideColor, |
| const GrSurfaceProxyView* views, |
| int numViews, |
| GrSamplerState params, |
| uint32_t flags) |
| : INHERITED(kGrDistanceFieldPathGeoProc_ClassID) |
| , fMatrix(matrix) |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) { |
| SkASSERT(numViews <= kMaxTextures); |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| |
| fInPosition = {"inPosition", kFloat2_GrVertexAttribType, SkSLType::kFloat2}; |
| fInColor = MakeColorAttribute("inColor", wideColor); |
| fInTextureCoords = {"inTextureCoords", kUShort2_GrVertexAttribType, |
| caps.integerSupport() ? SkSLType::kUShort2 : SkSLType::kFloat2}; |
| this->setVertexAttributesWithImplicitOffsets(&fInPosition, 3); |
| |
| if (numViews) { |
| fAtlasDimensions = views[0].proxy()->dimensions(); |
| } |
| |
| for (int i = 0; i < numViews; ++i) { |
| const GrSurfaceProxy* proxy = views[i].proxy(); |
| SkASSERT(proxy); |
| SkASSERT(proxy->dimensions() == fAtlasDimensions); |
| fTextureSamplers[i].reset(params, proxy->backendFormat(), views[i].swizzle()); |
| } |
| this->setTextureSamplerCnt(numViews); |
| } |
| |
| void GrDistanceFieldPathGeoProc::addNewViews(const GrSurfaceProxyView* views, |
| int numViews, |
| GrSamplerState params) { |
| SkASSERT(numViews <= kMaxTextures); |
| // Just to make sure we don't try to add too many proxies |
| numViews = std::min(numViews, kMaxTextures); |
| |
| if (!fTextureSamplers[0].isInitialized()) { |
| fAtlasDimensions = views[0].proxy()->dimensions(); |
| } |
| |
| for (int i = 0; i < numViews; ++i) { |
| const GrSurfaceProxy* proxy = views[i].proxy(); |
| SkASSERT(proxy); |
| SkASSERT(proxy->dimensions() == fAtlasDimensions); |
| if (!fTextureSamplers[i].isInitialized()) { |
| fTextureSamplers[i].reset(params, proxy->backendFormat(), views[i].swizzle()); |
| } |
| } |
| this->setTextureSamplerCnt(numViews); |
| } |
| |
| void GrDistanceFieldPathGeoProc::addToKey(const GrShaderCaps& caps, |
| skgpu::KeyBuilder* b) const { |
| uint32_t key = fFlags; |
| key |= ProgramImpl::ComputeMatrixKey(caps, fMatrix) << 16; |
| key |= fMatrix.hasPerspective() << (16 + ProgramImpl::kMatrixKeyBits); |
| b->add32(key); |
| b->add32(this->numTextureSamplers()); |
| } |
| |
| std::unique_ptr<GrGeometryProcessor::ProgramImpl> GrDistanceFieldPathGeoProc::makeProgramImpl( |
| const GrShaderCaps&) const { |
| return std::make_unique<Impl>(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldPathGeoProc); |
| |
| #if GR_TEST_UTILS |
| GrGeometryProcessor* GrDistanceFieldPathGeoProc::TestCreate(GrProcessorTestData* d) { |
| auto [view, ct, at] = d->randomAlphaOnlyView(); |
| |
| GrSamplerState::WrapMode wrapModes[2]; |
| GrTest::TestWrapModes(d->fRandom, wrapModes); |
| GrSamplerState samplerState(wrapModes, d->fRandom->nextBool() |
| ? GrSamplerState::Filter::kLinear |
| : GrSamplerState::Filter::kNearest); |
| |
| uint32_t flags = 0; |
| flags |= d->fRandom->nextBool() ? kSimilarity_DistanceFieldEffectFlag : 0; |
| if (flags & kSimilarity_DistanceFieldEffectFlag) { |
| flags |= d->fRandom->nextBool() ? kScaleOnly_DistanceFieldEffectFlag : 0; |
| } |
| SkMatrix localMatrix = GrTest::TestMatrix(d->fRandom); |
| bool wideColor = d->fRandom->nextBool(); |
| return GrDistanceFieldPathGeoProc::Make(d->allocator(), *d->caps()->shaderCaps(), |
| localMatrix, |
| wideColor, |
| &view, 1, |
| samplerState, |
| flags); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class GrDistanceFieldLCDTextGeoProc::Impl : public ProgramImpl { |
| public: |
| void setData(const GrGLSLProgramDataManager& pdman, |
| const GrShaderCaps& shaderCaps, |
| const GrGeometryProcessor& geomProc) override { |
| SkASSERT(fDistanceAdjustUni.isValid()); |
| |
| const GrDistanceFieldLCDTextGeoProc& dflcd = geomProc.cast<GrDistanceFieldLCDTextGeoProc>(); |
| GrDistanceFieldLCDTextGeoProc::DistanceAdjust wa = dflcd.fDistanceAdjust; |
| if (wa != fDistanceAdjust) { |
| pdman.set3f(fDistanceAdjustUni, wa.fR, wa.fG, wa.fB); |
| fDistanceAdjust = wa; |
| } |
| |
| const SkISize& atlasDimensions = dflcd.fAtlasDimensions; |
| SkASSERT(SkIsPow2(atlasDimensions.fWidth) && SkIsPow2(atlasDimensions.fHeight)); |
| if (fAtlasDimensions != atlasDimensions) { |
| pdman.set2f(fAtlasDimensionsInvUniform, |
| 1.0f / atlasDimensions.fWidth, |
| 1.0f / atlasDimensions.fHeight); |
| fAtlasDimensions = atlasDimensions; |
| } |
| SetTransform(pdman, shaderCaps, fLocalMatrixUniform, dflcd.fLocalMatrix, &fLocalMatrix); |
| } |
| |
| private: |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override { |
| const GrDistanceFieldLCDTextGeoProc& dfTexEffect = |
| args.fGeomProc.cast<GrDistanceFieldLCDTextGeoProc>(); |
| |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(dfTexEffect); |
| |
| const char* atlasDimensionsInvName; |
| fAtlasDimensionsInvUniform = uniformHandler->addUniform(nullptr, |
| kVertex_GrShaderFlag, |
| SkSLType::kFloat2, |
| "AtlasDimensionsInv", |
| &atlasDimensionsInvName); |
| |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| |
| // setup pass through color |
| fragBuilder->codeAppendf("half4 %s;\n", args.fOutputColor); |
| varyingHandler->addPassThroughAttribute(dfTexEffect.fInColor.asShaderVar(), |
| args.fOutputColor); |
| |
| // Setup position |
| gpArgs->fPositionVar = dfTexEffect.fInPosition.asShaderVar(); |
| WriteLocalCoord(vertBuilder, |
| uniformHandler, |
| *args.fShaderCaps, |
| gpArgs, |
| dfTexEffect.fInPosition.asShaderVar(), |
| dfTexEffect.fLocalMatrix, |
| &fLocalMatrixUniform); |
| |
| // set up varyings |
| GrGLSLVarying uv, texIdx, st; |
| append_index_uv_varyings(args, |
| dfTexEffect.numTextureSamplers(), |
| dfTexEffect.fInTextureCoords.name(), |
| atlasDimensionsInvName, |
| &uv, |
| &texIdx, |
| &st); |
| |
| GrGLSLVarying delta(SkSLType::kFloat); |
| varyingHandler->addVarying("Delta", &delta); |
| if (dfTexEffect.fFlags & kBGR_DistanceFieldEffectFlag) { |
| vertBuilder->codeAppendf("%s = -%s.x/3.0;", delta.vsOut(), atlasDimensionsInvName); |
| } else { |
| vertBuilder->codeAppendf("%s = %s.x/3.0;", delta.vsOut(), atlasDimensionsInvName); |
| } |
| |
| // add frag shader code |
| bool isUniformScale = (dfTexEffect.fFlags & kUniformScale_DistanceFieldEffectMask) == |
| kUniformScale_DistanceFieldEffectMask; |
| bool isSimilarity = SkToBool(dfTexEffect.fFlags & kSimilarity_DistanceFieldEffectFlag ); |
| bool isGammaCorrect = SkToBool(dfTexEffect.fFlags & kGammaCorrect_DistanceFieldEffectFlag); |
| |
| // create LCD offset adjusted by inverse of transform |
| // Use highp to work around aliasing issues |
| fragBuilder->codeAppendf("float2 uv = %s;\n", uv.fsIn()); |
| |
| if (isUniformScale) { |
| if (args.fShaderCaps->avoidDfDxForGradientsWhenPossible()) { |
| fragBuilder->codeAppendf("half st_grad_len = half(abs(dFdy(%s.y)));", st.fsIn()); |
| } else { |
| fragBuilder->codeAppendf("half st_grad_len = half(abs(dFdx(%s.x)));", st.fsIn()); |
| } |
| fragBuilder->codeAppendf("half2 offset = half2(half(st_grad_len*%s), 0.0);", |
| delta.fsIn()); |
| } 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. |
| if (args.fShaderCaps->avoidDfDxForGradientsWhenPossible()) { |
| // We use dFdy instead and rotate -90 degrees to get the gradient in the x |
| // direction. |
| fragBuilder->codeAppendf("half2 st_grad = half2(dFdy(%s));", st.fsIn()); |
| fragBuilder->codeAppendf("half2 offset = half2(%s*float2(st_grad.y, -st_grad.x));", |
| delta.fsIn()); |
| } else { |
| fragBuilder->codeAppendf("half2 st_grad = half2(dFdx(%s));", st.fsIn()); |
| fragBuilder->codeAppendf("half2 offset = half(%s)*st_grad;", delta.fsIn()); |
| } |
| fragBuilder->codeAppend("half st_grad_len = length(st_grad);"); |
| } else { |
| fragBuilder->codeAppendf("half2 st = half2(%s);\n", st.fsIn()); |
| |
| fragBuilder->codeAppend("half2 Jdx = half2(dFdx(st));"); |
| fragBuilder->codeAppend("half2 Jdy = half2(dFdy(st));"); |
| fragBuilder->codeAppendf("half2 offset = half2(half(%s))*Jdx;", delta.fsIn()); |
| } |
| |
| // sample the texture by index |
| fragBuilder->codeAppend("half4 texColor;"); |
| append_multitexture_lookup(args, dfTexEffect.numTextureSamplers(), |
| texIdx, "uv", "texColor"); |
| |
| // green is distance to uv center |
| fragBuilder->codeAppend("half3 distance;"); |
| fragBuilder->codeAppend("distance.y = texColor.r;"); |
| // red is distance to left offset |
| fragBuilder->codeAppend("half2 uv_adjusted = half2(uv) - offset;"); |
| append_multitexture_lookup(args, dfTexEffect.numTextureSamplers(), |
| texIdx, "uv_adjusted", "texColor"); |
| fragBuilder->codeAppend("distance.x = texColor.r;"); |
| // blue is distance to right offset |
| fragBuilder->codeAppend("uv_adjusted = half2(uv) + offset;"); |
| append_multitexture_lookup(args, dfTexEffect.numTextureSamplers(), |
| texIdx, "uv_adjusted", "texColor"); |
| fragBuilder->codeAppend("distance.z = texColor.r;"); |
| |
| fragBuilder->codeAppend("distance = " |
| "half3(" SK_DistanceFieldMultiplier ")*(distance - half3(" SK_DistanceFieldThreshold"));"); |
| |
| // adjust width based on gamma |
| const char* distanceAdjustUniName = nullptr; |
| fDistanceAdjustUni = uniformHandler->addUniform(nullptr, kFragment_GrShaderFlag, |
| SkSLType::kHalf3, "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("half 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("half2 dist_grad = half2(half(dFdx(distance.r)), " |
| "half(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("half dg_len2 = dot(dist_grad, dist_grad);"); |
| fragBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);"); |
| fragBuilder->codeAppend("} else {"); |
| fragBuilder->codeAppend("dist_grad = dist_grad*half(inversesqrt(dg_len2));"); |
| fragBuilder->codeAppend("}"); |
| fragBuilder->codeAppend("half2 grad = half2(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->codeAppendf("half4 %s = " |
| "half4(saturate((distance + half3(afwidth)) / half3(2.0 * afwidth)), 1.0);", |
| args.fOutputCoverage); |
| } else { |
| fragBuilder->codeAppendf( |
| "half4 %s = half4(smoothstep(half3(-afwidth), half3(afwidth), distance), 1.0);", |
| args.fOutputCoverage); |
| } |
| } |
| |
| private: |
| DistanceAdjust fDistanceAdjust = DistanceAdjust::Make(1.0f, 1.0f, 1.0f); |
| SkISize fAtlasDimensions = {-1, -1}; |
| SkMatrix fLocalMatrix = SkMatrix::InvalidMatrix(); |
| |
| UniformHandle fDistanceAdjustUni; |
| UniformHandle fAtlasDimensionsInvUniform; |
| UniformHandle fLocalMatrixUniform; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldLCDTextGeoProc::GrDistanceFieldLCDTextGeoProc(const GrShaderCaps& caps, |
| const GrSurfaceProxyView* views, |
| int numViews, |
| GrSamplerState params, |
| DistanceAdjust distanceAdjust, |
| uint32_t flags, |
| const SkMatrix& localMatrix) |
| : INHERITED(kGrDistanceFieldLCDTextGeoProc_ClassID) |
| , fLocalMatrix(localMatrix) |
| , fDistanceAdjust(distanceAdjust) |
| , fFlags(flags & kLCD_DistanceFieldEffectMask) { |
| SkASSERT(numViews <= kMaxTextures); |
| SkASSERT(!(flags & ~kLCD_DistanceFieldEffectMask) && (flags & kUseLCD_DistanceFieldEffectFlag)); |
| |
| if (fFlags & kPerspective_DistanceFieldEffectFlag) { |
| fInPosition = {"inPosition", kFloat3_GrVertexAttribType, SkSLType::kFloat3}; |
| } else { |
| fInPosition = {"inPosition", kFloat2_GrVertexAttribType, SkSLType::kFloat2}; |
| } |
| fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, SkSLType::kHalf4}; |
| fInTextureCoords = {"inTextureCoords", kUShort2_GrVertexAttribType, |
| caps.integerSupport() ? SkSLType::kUShort2 : SkSLType::kFloat2}; |
| this->setVertexAttributesWithImplicitOffsets(&fInPosition, 3); |
| |
| if (numViews) { |
| fAtlasDimensions = views[0].proxy()->dimensions(); |
| } |
| |
| for (int i = 0; i < numViews; ++i) { |
| const GrSurfaceProxy* proxy = views[i].proxy(); |
| SkASSERT(proxy); |
| SkASSERT(proxy->dimensions() == fAtlasDimensions); |
| fTextureSamplers[i].reset(params, proxy->backendFormat(), views[i].swizzle()); |
| } |
| this->setTextureSamplerCnt(numViews); |
| } |
| |
| void GrDistanceFieldLCDTextGeoProc::addNewViews(const GrSurfaceProxyView* views, |
| int numViews, |
| GrSamplerState params) { |
| SkASSERT(numViews <= kMaxTextures); |
| // Just to make sure we don't try to add too many proxies |
| numViews = std::min(numViews, kMaxTextures); |
| |
| if (!fTextureSamplers[0].isInitialized()) { |
| fAtlasDimensions = views[0].proxy()->dimensions(); |
| } |
| |
| for (int i = 0; i < numViews; ++i) { |
| const GrSurfaceProxy* proxy = views[i].proxy(); |
| SkASSERT(proxy); |
| SkASSERT(proxy->dimensions() == fAtlasDimensions); |
| if (!fTextureSamplers[i].isInitialized()) { |
| fTextureSamplers[i].reset(params, proxy->backendFormat(), views[i].swizzle()); |
| } |
| } |
| this->setTextureSamplerCnt(numViews); |
| } |
| |
| void GrDistanceFieldLCDTextGeoProc::addToKey(const GrShaderCaps& caps, |
| skgpu::KeyBuilder* b) const { |
| uint32_t key = 0; |
| key |= ProgramImpl::ComputeMatrixKey(caps, fLocalMatrix); |
| key |= fFlags << 16; |
| b->add32(key); |
| b->add32(this->numTextureSamplers()); |
| } |
| |
| std::unique_ptr<GrGeometryProcessor::ProgramImpl> GrDistanceFieldLCDTextGeoProc::makeProgramImpl( |
| const GrShaderCaps&) const { |
| return std::make_unique<Impl>(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldLCDTextGeoProc); |
| |
| #if GR_TEST_UTILS |
| GrGeometryProcessor* GrDistanceFieldLCDTextGeoProc::TestCreate(GrProcessorTestData* d) { |
| auto [view, ct, at] = d->randomView(); |
| |
| GrSamplerState::WrapMode wrapModes[2]; |
| GrTest::TestWrapModes(d->fRandom, wrapModes); |
| GrSamplerState samplerState(wrapModes, d->fRandom->nextBool() |
| ? GrSamplerState::Filter::kLinear |
| : GrSamplerState::Filter::kNearest); |
| 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; |
| SkMatrix localMatrix = GrTest::TestMatrix(d->fRandom); |
| |
| return GrDistanceFieldLCDTextGeoProc::Make(d->allocator(), *d->caps()->shaderCaps(), &view, |
| 1, samplerState, wa, flags, localMatrix); |
| } |
| #endif |
