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ac/gpu_info: update conformant_trunc_coord comment

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25911>
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Rhys Perry 2023-11-07 15:59:39 +00:00 • committed by Marge Bot
parent 9e9eb87dd3
commit a279767424
1 changed files with 13 additions and 7 deletions
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20
src/amd/common/ac_gpu_info.h
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@ -121,14 +121,20 @@ struct radeon_info {
/* conformant_trunc_coord is equal to TA_CNTL2.TRUNCATE_COORD_MODE, which exists since gfx11.
*
* If TA_CNTL2.TRUNCATE_COORD_MODE == 0, coordinate truncation is the same as gfx10 and older.
* If TA_CNTL2.TRUNCATE_COORD_MODE == 1, coordinate truncation is adjusted to be conformant
* if you also set TRUNC_COORD.
*
* Behavior:
* truncate_coord_xy = TRUNC_COORD &&
* ((xy_filter == Point && !gather) || !TA_CNTL2.TRUNCATE_COORD_MODE);
* truncate_coord_z = TRUNC_COORD && (z_filter == Point || !TA_CNTL2.TRUNCATE_COORD_MODE);
* truncate_coord_layer = TRUNC_COORD && !TA_CNTL2.TRUNCATE_COORD_MODE;
* If TA_CNTL2.TRUNCATE_COORD_MODE == 1, coordinate truncation is adjusted to be D3D9/GL/Vulkan
* conformant if you also set TRUNC_COORD. Coordinate truncation uses D3D10+ behaviour if
* TRUNC_COORD is unset.
*
* Behavior if TA_CNTL2.TRUNCATE_COORD_MODE == 1:
* truncate_coord_xy = TRUNC_COORD && (xy_filter == Point && !gather);
* truncate_coord_z = TRUNC_COORD && (z_filter == Point);
* truncate_coord_layer = false;
*
* Behavior if TA_CNTL2.TRUNCATE_COORD_MODE == 0:
* truncate_coord_xy = TRUNC_COORD;
* truncate_coord_z = TRUNC_COORD;
* truncate_coord_layer = TRUNC_COORD;
*
* AnisoPoint is treated as Point.
*/