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broadcom/compiler: improve documentation for Z writes

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Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14037>
This commit is contained in:
Iago Toral Quiroga 2021-12-03 10:44:14 +01:00 • committed by Marge Bot
parent d7b79f3531
commit cc7db1fc53
1 changed files with 6 additions and 4 deletions
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10
src/broadcom/compiler/nir_to_vir.c
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@ -1707,10 +1707,12 @@ emit_frag_end(struct v3d_compile *c)
c->s->info.fs.early_fragment_tests = true;
}
/* By default, the FEP will perform early fragment tests. This can be
* disabled when needed (Z writes from shader, discards, etc), by
* setting c->writes_z to True, in which case, the QPUs need to write
* the Z value.
/* By default, Z buffer writes are implicit using the Z values produced
* from FEP (Z value produced from rasterization). When this is not
* desirable (shader writes Z explicitly, has discards, etc) we need
* to let the hardware know by setting c->writes_z to true, in which
* case we always need to write a Z value from the QPU, even if it is
* just the passthrough Z value produced from FEP.
*
* Also, from the V3D 4.2 spec:
*