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llvmpipe: fix front/back face system value in the fs

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draw needs to inject the face information for tris in line/point fill
mode since llvmpipe only sees lines and points. But for the new style
face information (which is a system value and not an ordinary input
register) we forgot to tell draw.

Reviewed-by: Brian Paul <brianp@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18285>
This commit is contained in:
Roland Scheidegger 2022-08-27 05:26:34 +02:00
parent 723ae2368f
commit 08615f2807
1 changed files with 12 additions and 0 deletions
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12
src/gallium/drivers/llvmpipe/lp_state_derived.c
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@ -124,6 +124,18 @@ compute_vertex_info(struct llvmpipe_context *llvmpipe)
}
}
/*
* The new style front face is a system value, hence won't show up as
* ordinary fs register above. But we still need to assign a vs output
* location so draw can inject face info for unfilled tris.
*/
if (llvmpipe->face_slot < 0 && fsInfo->uses_frontface) {
vs_index = draw_find_shader_output(llvmpipe->draw,
TGSI_SEMANTIC_FACE, 0);
llvmpipe->face_slot = (int)vinfo->num_attribs;
draw_emit_vertex_attr(vinfo, EMIT_4F, vs_index);
}
/* Figure out if we need bcolor as well.
*/
for (i = 0; i < 2; i++) {