WebRender uses GL_ALWAYS depth comparison function, but SWGL doesn't support that
Categories
(Core :: Graphics: WebRender, defect)
Tracking
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| Tracking | Status | |
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| firefox80 | --- | fixed |
People
(Reporter: jimb, Assigned: jimb)
References
(Blocks 1 open bug)
Details
Attachments
(1 file)
With bug 1638672, WebRender uses the GL_ALWAYS depth comparison function (for clearing picture caches with quads instead of clear operations), but SWGL doesn't support GL_ALWAYS.
Rather than adding GL_ALWAYS support to SWGL, it would probably be best to just not have RendererOptions::clear_caches_with_quads set to true when using SWGL, since SWGL handles scissored clears just fine cough cough.
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Assignee | |
Comment 1•4 years ago
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The clear_caches_with_quads flags is meant to work around a bug in some
drivers' scissored clears, but its implementation uses the GL_ALWAYS depth
comparison function, which SWGL doesn't support.
SWGL does scissored clears very well, so simply turning this workaround off on
SWGL avoids the problem and gets good results.
Of course we could just make SWGL support GL_ALWAYS, but that would be kind of
annoying, since it basically disables depth checks altogether, and we want to
use entirely different paths when depth checks aren't needed.
Pushed by jblandy@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/6661db82a5db Turn of RendererOptions::clear_caches_with_quads under SWGL. r=lsalzman
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Comment 3•4 years ago
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| bugherder | ||
Description
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