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intel/fs: read viewport and layer from the FS payload

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Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25047>
This commit is contained in:
Iván Briano 2023-09-04 22:30:04 -07:00 • committed by Marge Bot
parent d36da7c5f8
commit 17d7f7a292
1 changed files with 39 additions and 0 deletions
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39
src/intel/compiler/brw_fs_nir.cpp
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@ -3486,6 +3486,45 @@ fs_visitor::nir_emit_fs_intrinsic(const fs_builder &bld,
unsigned comp = nir_intrinsic_component(instr);
unsigned num_components = instr->num_components;
const struct brw_wm_prog_key *wm_key = (brw_wm_prog_key*) this->key;
if (wm_key->mesh_input == BRW_SOMETIMES) {
assert(devinfo->verx10 >= 125);
/* The FS payload gives us the viewport and layer clamped to valid
* ranges, but the spec for gl_ViewportIndex and gl_Layer includes
* the language:
* the fragment stage will read the same value written by the
* geometry stage, even if that value is out of range.
*
* Which is why these are normally passed as regular attributes.
* This isn't tested anywhere except some GL-only piglit tests
* though, so for the case where the FS may be used against either a
* traditional pipeline or a mesh one, where the position of these
* will change depending on the previous stage, read them from the
* payload to simplify things until the requisite magic is in place.
*/
if (base == VARYING_SLOT_LAYER || base == VARYING_SLOT_VIEWPORT) {
assert(num_components == 1);
fs_reg g1(retype(brw_vec1_grf(1, 1), BRW_REGISTER_TYPE_UD));
unsigned mask, shift_count;
if (base == VARYING_SLOT_LAYER) {
shift_count = 16;
mask = 0x7ff << shift_count;
} else {
shift_count = 27;
mask = 0xf << shift_count;
}
fs_reg vp_or_layer = bld.vgrf(BRW_REGISTER_TYPE_UD);
bld.AND(vp_or_layer, g1, brw_imm_ud(mask));
fs_reg shifted_value = bld.vgrf(BRW_REGISTER_TYPE_UD);
bld.SHR(shifted_value, vp_or_layer, brw_imm_ud(shift_count));
bld.MOV(offset(dest, bld, 0), retype(shifted_value, dest.type));
break;
}
}
/* TODO(mesh): Multiview. Verify and handle these special cases for Mesh. */
/* Special case fields in the VUE header */