Graphics twitter, how do you handle clipping of child UI elements inside of another element that has arbitrary vector graphics? Rounded corners being an example that comes to mind. Stencil? Something else?
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If you just need to prevent fragments from being written there, you could provide the parametric form to the fragment shader and simply discard while outside, or maybe an SDF?
You're right on track with what I'm thinking. Again, in early stages, but I plan on using something like this already for a shape's own rejection of fragments. Doing also the parent's rejection... I need to think it through.
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This probably best describes the issue. The parent (red) has it's own parameter or SDF (pick your flavor) describing pixel rejection. If you imagine the child's rounded corner inside of the parent sphere, it needs to reject based on two parameters/SDFs.pic.twitter.com/9awUFynIQB
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If you can sort so that children are rendered first, you could use the depth buffer couldn't you? Just let early-z deal with discarding fragments.
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