Lionel Landwerlin
7ddb49653d
Instead the complicated logic we currently have, do this :
We start with this shader :
int main() {
...
if (...) {
SetMeshOutputsEXT(0, 0);
return;
} else {
SetMeshOutputsEXT(...);
}
...
}
We turn it into this :
int main() {
uint __temp_prim_count = 0;
...
if (...) {
__temp_prim_count = 0;
return;
} else {
__temp_prim_count = ...;
}
...
if (is_first_group_lane()) {
SetMeshOutputsEXT(..., __temp_prim_count);
}
}
This works because the SPIRV spec says this :
"The arguments are taken from the first invocation in each
workgroup. Any invocation must execute this instruction no more
than once and under uniform control flow."
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12388
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33038>
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