paths and blendmode multiply

[Shawn Riordan]

- Skia m104

- Draw paths (not text) with blendmode when using kNativeGL

- kScreen works fine, but kMultiply doesn't render anything

- Draws correctly with the kRaster backend:

But several blendmodes don't draw at all, with kNativeGL.

Any ideas?

[John Stiles]

Can you please put together a fiddle demonstrating the issue?

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[Shawn Riordan]

It doesn't seem to happen in the newest version:

https://fiddle.skia.org/c/d7c63bd39d10435528d6ba676d453b92

But it is happening in m104.

I was wondering if someone remembered a bug back in the day.

Like "OpenGL fragment shader for some blendmodes not working."

[Robert Phillips]

If I had to guess I would say it was:

https://skia-review.googlesource.com/c/skia/+/571277 (Flush color writing in GrGLGpu::flushBlendAndColorWrite for advanced blend modes).

It is a one line change so should be simple enough to patch in and verify.

   Rob

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