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e749f67f89
When lower_wpos_pntc is used, the state tracker inserts code to transform gl_PointCoord.y according to a uniform, to account for API-requested point coordinate origin and framebuffer orientation. With the transformation, driver-supplied point coordinates are expected to have an upper left origin. If the hardware point coordinate supports (only) a lower left origin, the backend has to use lower_wpos_pntc and then lower *again* to flip back. This ends up transforming twice, which is wasteful: a = load point coord Y with lower left origin a' = 1.0 - a a'' = uniform_transform(a') However, lower_wpos_pntc is quite capable of transforming for a lower left origin too, it just needs to flip the transformation. Add a CAP specifying the point coordinate origin convention, rather than assuming upper-left. This simplifies the Asahi code greatly. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16829> |
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| .. | ||
| cso | ||
| buffermapping.rst | ||
| context.rst | ||
| cso.rst | ||
| debugging.rst | ||
| distro.rst | ||
| format.rst | ||
| glossary.rst | ||
| index.rst | ||
| intro.rst | ||
| pipeline.txt | ||
| postprocess.rst | ||
| resources.rst | ||
| screen.rst | ||
| tgsi.rst | ||