diff options
Diffstat (limited to 'src/compiler/nir/nir_lower_wpos_ytransform.c')
| -rw-r--r-- | src/compiler/nir/nir_lower_wpos_ytransform.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_lower_wpos_ytransform.c b/src/compiler/nir/nir_lower_wpos_ytransform.c index 173f058572..f211c733d0 100644 --- a/src/compiler/nir/nir_lower_wpos_ytransform.c +++ b/src/compiler/nir/nir_lower_wpos_ytransform.c @@ -273,6 +273,26 @@ lower_interp_var_at_offset(lower_wpos_ytransform_state *state, } static void +lower_load_sample_pos(lower_wpos_ytransform_state *state, + nir_intrinsic_instr *intr) +{ + nir_builder *b = &state->b; + b->cursor = nir_after_instr(&intr->instr); + + nir_ssa_def *pos = &intr->dest.ssa; + nir_ssa_def *scale = nir_channel(b, get_transform(state), 0); + nir_ssa_def *neg_scale = nir_channel(b, get_transform(state), 2); + /* Either y or 1-y for scale equal to 1 or -1 respectively. */ + nir_ssa_def *flipped_y = + nir_fadd(b, nir_fmax(b, neg_scale, nir_imm_float(b, 0.0)), + nir_fmul(b, nir_channel(b, pos, 1), scale)); + nir_ssa_def *flipped_pos = nir_vec2(b, nir_channel(b, pos, 0), flipped_y); + + nir_ssa_def_rewrite_uses_after(&intr->dest.ssa, nir_src_for_ssa(flipped_pos), + flipped_pos->parent_instr); +} + +static void lower_wpos_ytransform_block(lower_wpos_ytransform_state *state, nir_block *block) { nir_foreach_instr_safe(instr, block) { @@ -287,6 +307,10 @@ lower_wpos_ytransform_block(lower_wpos_ytransform_state *state, nir_block *block /* gl_FragCoord should not have array/struct deref's: */ assert(dvar->deref.child == NULL); lower_fragcoord(state, intr); + } else if (var->data.mode == nir_var_system_value && + var->data.location == SYSTEM_VALUE_SAMPLE_POS) { + assert(dvar->deref.child == NULL); + lower_load_sample_pos(state, intr); } } else if (intr->intrinsic == nir_intrinsic_interp_var_at_offset) { lower_interp_var_at_offset(state, intr); |