diff options
| author | Brian Paul <[email protected]> | 2011-01-25 11:57:10 -0700 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2011-01-25 11:57:10 -0700 |
| commit | 23490d7a8bb77cc0a39ffe7c1ce83ce8e9e9c5bb (patch) | |
| tree | 8f76c96839ea0cc6e805a8995762f17f7aedce56 /src/mesa/state_tracker | |
| parent | bb56631f0cb6b3fc552a72e0165816909bf6fdc9 (diff) | |
st/mesa: add comments in emit_wpos()
Diffstat (limited to 'src/mesa/state_tracker')
| -rw-r--r-- | src/mesa/state_tracker/st_mesa_to_tgsi.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_mesa_to_tgsi.c b/src/mesa/state_tracker/st_mesa_to_tgsi.c index f2a97ae293d..a14551b4345 100644 --- a/src/mesa/state_tracker/st_mesa_to_tgsi.c +++ b/src/mesa/state_tracker/st_mesa_to_tgsi.c @@ -850,9 +850,12 @@ emit_wpos(struct st_context *st, boolean invert = FALSE; if (fp->OriginUpperLeft) { + /* Fragment shader wants origin in upper-left */ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT)) { + /* the driver supports upper-left origin */ } else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT)) { + /* the driver supports lower-left origin, need to invert Y */ ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT); invert = TRUE; } @@ -860,26 +863,35 @@ emit_wpos(struct st_context *st, assert(0); } else { + /* Fragment shader wants origin in lower-left */ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT)) + /* the driver supports lower-left origin */ ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT); else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT)) + /* the driver supports upper-left origin, need to invert Y */ invert = TRUE; else assert(0); } if (fp->PixelCenterInteger) { + /* Fragment shader wants pixel center integer */ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER)) + /* the driver supports pixel center integer */ ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER); else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER)) + /* the driver supports pixel center half integer, need to bias X,Y */ emit_adjusted_wpos(t, program, 0.5f, invert ? 0.5f : -0.5f); else assert(0); } else { + /* Fragment shader wants pixel center half integer */ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER)) { + /* the driver supports pixel center half integer */ } else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER)) { + /* the driver supports pixel center integer, need to bias X,Y */ ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER); emit_adjusted_wpos(t, program, 0.5f, invert ? -0.5f : 0.5f); } |