Add GPU support for axis-aligned ovals:
- Add drawOval base function to SkDevice, and override in SkGpuDevice
- Move isSimilarityMatrix to SkMatrix (renamed to isSimilarity) and fixed up unit test
- Since both SkGpuDevice::drawOval() and GrContext::drawPath() can try to draw ovals, added GrContext::canDrawOval() and GrContext::internalDrawOval() to avoid duplicate code
- Hooked in axis-aligned oval fill shader
- Enabled GPU stroked circles
- Added stroked circle bench test
Review URL: https://codereview.appspot.com/7137050
git-svn-id: http://skia.googlecode.com/svn/trunk@7304 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLProgram.cpp b/src/gpu/gl/GrGLProgram.cpp
index 9853af2..26127e4 100644
--- a/src/gpu/gl/GrGLProgram.cpp
+++ b/src/gpu/gl/GrGLProgram.cpp
@@ -276,6 +276,13 @@
builder->fFSCode.appendf("\tfloat innerAlpha = %s.w == 0.0 ? 1.0 : smoothstep(%s.w - 0.5, %s.w + 0.5, d);\n", fsName, fsName, fsName);
builder->fFSCode.append("\tedgeAlpha = outerAlpha * innerAlpha;\n");
break;
+ case GrDrawState::kEllipse_EdgeType:
+ builder->fFSCode.append("\tfloat edgeAlpha;\n");
+ builder->fFSCode.appendf("\tvec2 offset = (%s.xy - %s.xy);\n", builder->fragmentPosition(), fsName);
+ builder->fFSCode.appendf("\toffset.y *= %s.w;\n", fsName);
+ builder->fFSCode.append("\tfloat d = length(offset);\n");
+ builder->fFSCode.appendf("\tedgeAlpha = smoothstep(d - 0.5, d + 0.5, %s.z);\n", fsName);
+ break;
default:
GrCrash("Unknown Edge Type!");
break;