Add a stencil/tessellation hybrid mode for path rendering
This is a hybrid approach where we stencil only the curves using GPU
tessellation shaders, and then tessellate the path's inner polygon on
CPU and draw it directly to the final render target, stencilled
against the curves. Tessellating just the inner polygon is more than
fast enough to do in real time, and still allows us fill in the
majority of pixels in a single render pass. It gives us most the
benefit of CPU tessellation, but at a fraction of the cost.
Furthermore, the tessellated inner polygon can potentially be cached
and reused independent of the view matrix.
Change-Id: Id45adc643b51ab80a0c655dd2045a5314bdc7507
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/266456
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
13 files changed