diff options
| author | Axel Davy <[email protected]> | 2016-06-14 22:41:50 +0200 |
|---|---|---|
| committer | Axel Davy <[email protected]> | 2016-06-25 10:16:15 +0200 |
| commit | be7957b156e30ffe9fb647b58ba00e236e498c3f (patch) | |
| tree | 32cbeb9404cc19247a6ee84254cd87d9ea801cfe /src/gallium/drivers/radeonsi/si_state.c | |
| parent | c2b7b48a54e0124dd8aa0513a264d76535ea9829 (diff) | |
radeonsi: Implement POLYGON_OFFSET_UNITS_UNSCALED
Empirical tests show that the polygon offset
behaviour is entirely determined by the content of
the PA_SU_POLY_OFFSET states, and not by the depth buffer
format bound.
PA_SU_POLY_OFFSET seems to directly set the parameters of
the polygon offset formula, and setting 0 for
PA_SU_POLY_OFFSET_DB_FMT_CNTL (ie setting the unorm depth
bias behaviour with a scale of 2^0 = 1.0f) gives the unscaled
behaviour.
Signed-off-by: Axel Davy <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Diffstat (limited to 'src/gallium/drivers/radeonsi/si_state.c')
| -rw-r--r-- | src/gallium/drivers/radeonsi/si_state.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c index ccae571cfd4..04e9f19fa3f 100644 --- a/src/gallium/drivers/radeonsi/si_state.c +++ b/src/gallium/drivers/radeonsi/si_state.c @@ -810,20 +810,24 @@ static void *si_create_rs_state(struct pipe_context *ctx, float offset_scale = state->offset_scale * 16.0f; uint32_t pa_su_poly_offset_db_fmt_cntl = 0; - switch (i) { - case 0: /* 16-bit zbuffer */ - offset_units *= 4.0f; - pa_su_poly_offset_db_fmt_cntl = S_028B78_POLY_OFFSET_NEG_NUM_DB_BITS(-16); - break; - case 1: /* 24-bit zbuffer */ - offset_units *= 2.0f; - pa_su_poly_offset_db_fmt_cntl = S_028B78_POLY_OFFSET_NEG_NUM_DB_BITS(-24); - break; - case 2: /* 32-bit zbuffer */ - offset_units *= 1.0f; - pa_su_poly_offset_db_fmt_cntl = S_028B78_POLY_OFFSET_NEG_NUM_DB_BITS(-23) | - S_028B78_POLY_OFFSET_DB_IS_FLOAT_FMT(1); - break; + if (!state->offset_units_unscaled) { + switch (i) { + case 0: /* 16-bit zbuffer */ + offset_units *= 4.0f; + pa_su_poly_offset_db_fmt_cntl = + S_028B78_POLY_OFFSET_NEG_NUM_DB_BITS(-16); + break; + case 1: /* 24-bit zbuffer */ + offset_units *= 2.0f; + pa_su_poly_offset_db_fmt_cntl = + S_028B78_POLY_OFFSET_NEG_NUM_DB_BITS(-24); + break; + case 2: /* 32-bit zbuffer */ + offset_units *= 1.0f; + pa_su_poly_offset_db_fmt_cntl = S_028B78_POLY_OFFSET_NEG_NUM_DB_BITS(-23) | + S_028B78_POLY_OFFSET_DB_IS_FLOAT_FMT(1); + break; + } } si_pm4_set_reg(pm4, R_028B80_PA_SU_POLY_OFFSET_FRONT_SCALE, |