Investigate provoking vertex semantics

gfx-rs / portability

Vulkan Portability Implementation

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Investigate provoking vertex semantics #160

Closed kvark closed 5 years ago

kvark commented 5 years ago

We've recently hit an interesting issue in WebRender - https://github.com/servo/webrender/issues/3004 The gist of it is that the provoking vertex may be different in different APIs, which leads to flat interpolation to have different results. TODO:

figure out the exact semantics guaranteed by Vulkan spec
match it against Metal and D3D12
check the relevant CTS sections

kvark commented 5 years ago

oops, wrong repo