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ac: document ac_shader_args::gs_vtx_offset

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Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24759>
This commit is contained in:
Marek Olšák
2023-08-16 14:45:19 -04:00
committed by Marge Bot
parent a2bf30961f
commit bc44121444
1 changed files with 16 additions and 1 deletions
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17
src/amd/common/ac_shader_args.h
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@@ -102,7 +102,22 @@ struct ac_shader_args {
struct ac_arg gs2vs_offset; /* legacy GS */
struct ac_arg gs_wave_id; /* legacy GS */
struct ac_arg gs_attr_offset; /* gfx11+: attribute ring offset in 512B increments */
struct ac_arg gs_vtx_offset[6]; /* GFX6-8: [0-5], GFX9+: [0-2] packed */
/* GS vertex indices/offsets:
*
* GFX6-8: [0-5] 6x uint32, multiplied by VGT_ESGS_RING_ITEMSIZE by hw
* GFX9-11 non-passthrough: [0-2] 6x packed uint16, multiplied by VGT_ESGS_RING_ITEMSIZE by hw
*
* GFX10-11 passthrough: [0] 1x uint32 with the following bitfields matching the prim export:
* [0:8] vertex index 0
* [9] edgeflag 0
* [10:18] vertex index 1
* [19] edgeflag 1
* [20:28] vertex index 2
* [29] edgeflag 2
* [31] 0 (valid prim)
*/
struct ac_arg gs_vtx_offset[6];
struct ac_arg gs_prim_id;
struct ac_arg gs_invocation_id;