fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-25 02:10:11 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

i965: Use true AA line distance on G45/Ironlake.

Browse source 
The original Broadwater and Crestline platforms computed antialiased
line distances using "manhattan" distance, aka a + b = c.  Eaglelake
and Cantiga added "true" distance, which apparently does something
like max(a, b) + min(a, b) / 4.  Not exactly "true", but at least
more accurate.

The G45 documentation indicates that the old manhattan distance setting
is "only for debug purposes" and should never be used.  The Ironlake
documentation no longer mentions AALINEDISTANCE_MANHATTAN, though it
does still contain the narrative about the feature.

At any rate, we should use the more accurate mode.

Reviewed-by: Plamena Manolova <plamena.manolova@intel.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
This commit is contained in:
Kenneth Graunke 2017-04-26 14:28:49 -07:00
parent 81149c8f52
commit b625bcc601
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/mesa/drivers/dri/i965/brw_sf_state.c
View file

@ -265,7 +265,7 @@ static void upload_sf_unit( struct brw_context *brw )
/* _NEW_PROGRAM | _NEW_POINT */
sf->sf7.use_point_size_state = !(ctx->VertexProgram.PointSizeEnabled ||
ctx->Point._Attenuated);
sf->sf7.aa_line_distance_mode = 0;
sf->sf7.aa_line_distance_mode = brw->is_g4x || brw->gen == 5;
/* might be BRW_NEW_PRIMITIVE if we have to adjust pv for polygons:
* _NEW_LIGHT