https://bugs.freedesktop.org/show_bug.cgi?id=97231
--- Comment #18 from Ilia Mirkin <imir...@alum.mit.edu> ---
FWIW this also fails on nouveau right now... this is a part of the patch I'm
going to have to apply (still working out the full details, but this should
have the general idea):
@@ -329,8 +329,21 @@ nvc0_validate_viewport(struct nvc0_context *nvc0)
PUSH_DATA (push, (w << 16) | x);
PUSH_DATA (push, (h << 16) | y);
- zmin = vp->translate[2] - fabsf(vp->scale[2]);
- zmax = vp->translate[2] + fabsf(vp->scale[2]);
+ if (nvc0->rast->pipe.clip_halfz) {
+ zmin = vp->translate[2];
+ zmax = vp->translate[2] + vp->scale[2];
+ if (zmax < zmin) {
+ float t = zmax;
+ zmax = zmin;
+ zmin = t;
+ }
+ } else {
+ zmin = vp->translate[2] - fabsf(vp->scale[2]);
+ zmax = vp->translate[2] + fabsf(vp->scale[2]);
+ }
Note that the near/far planes have to be calculated differently based on
whether clip_halfz is enabled.
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