diff options
| -rw-r--r-- | src/gpu/GrOvalRenderer.cpp | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/src/gpu/GrOvalRenderer.cpp b/src/gpu/GrOvalRenderer.cpp index aec9b76ba8..527b96e2c6 100644 --- a/src/gpu/GrOvalRenderer.cpp +++ b/src/gpu/GrOvalRenderer.cpp @@ -83,10 +83,13 @@ public: fStroke = stroke; } + bool implementsDistanceVector() const override { return true; }; + const Attribute* inPosition() const { return fInPosition; } const Attribute* inColor() const { return fInColor; } const Attribute* inCircleEdge() const { return fInCircleEdge; } const SkMatrix& localMatrix() const { return fLocalMatrix; } + virtual ~CircleGeometryProcessor() {} const char* name() const override { return "CircleEdge"; } @@ -126,14 +129,24 @@ public: args.fTransformsOut); fragBuilder->codeAppendf("float d = length(%s.xy);", v.fsIn()); - fragBuilder->codeAppendf("float edgeAlpha = clamp(%s.z * (1.0 - d), 0.0, 1.0);", - v.fsIn()); + fragBuilder->codeAppendf("float distanceToEdge = %s.z * (1.0 - d);", v.fsIn()); + fragBuilder->codeAppendf("float edgeAlpha = clamp(distanceToEdge, 0.0, 1.0);"); if (cgp.fStroke) { fragBuilder->codeAppendf("float innerAlpha = clamp(%s.z * (d - %s.w), 0.0, 1.0);", v.fsIn(), v.fsIn()); fragBuilder->codeAppend("edgeAlpha *= innerAlpha;"); } + if (args.fDistanceVectorName) { + fragBuilder->codeAppend ("if (d == 0.0) {"); // if on the center of the circle + fragBuilder->codeAppendf(" %s = vec2(distanceToEdge, 0.0);", // avoid normalizing + args.fDistanceVectorName); + fragBuilder->codeAppend ("} else {"); + fragBuilder->codeAppendf(" %s = normalize(%s.xy) * distanceToEdge;", + args.fDistanceVectorName, v.fsIn()); + fragBuilder->codeAppend ("}"); + } + fragBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage); } |