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agx: Implement noperspective interpolation 

We need to get a matching coefficient register and change the encoding
of the iter instruction slightly, but otherwise this is normal.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17198>
This commit is contained in:
Alyssa Rosenzweig 2022-08-07 13:46:18 -04:00
parent 638d7f542e
commit f759459cd6
1 changed files with 10 additions and 6 deletions
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16
src/asahi/compiler/agx_compile.c
View File

@ -345,27 +345,31 @@ static void
agx_emit_load_vary(agx_builder *b, agx_index *dests, nir_intrinsic_instr *instr)
{
ASSERTED unsigned components = instr->num_components;
ASSERTED nir_intrinsic_instr *parent = nir_src_as_intrinsic(instr->src[0]);
nir_intrinsic_instr *bary = nir_src_as_intrinsic(instr->src[0]);
assert(components >= 1 && components <= 4);
assert(parent);
/* TODO: Interpolation modes */
assert(parent->intrinsic == nir_intrinsic_load_barycentric_pixel);
assert(bary != NULL);
assert(bary->intrinsic == nir_intrinsic_load_barycentric_pixel);
bool perspective =
nir_intrinsic_interp_mode(bary) != INTERP_MODE_NOPERSPECTIVE;
nir_io_semantics sem = nir_intrinsic_io_semantics(instr);
nir_src *offset = nir_get_io_offset_src(instr);
assert(nir_src_is_const(*offset) && "no indirects");
/* For perspective interpolation, we need W */
agx_index J = agx_get_cf(b->shader, true, false, VARYING_SLOT_POS, 3, 1);
agx_index J = !perspective ? agx_zero() :
agx_get_cf(b->shader, true, false, VARYING_SLOT_POS, 3, 1);
agx_index I = agx_get_cf(b->shader, true, true,
agx_index I = agx_get_cf(b->shader, true, perspective,
sem.location + nir_src_as_uint(*offset), 0,
components);
agx_index vec = agx_vec_for_intr(b->shader, instr);
agx_iter_to(b, vec, I, J, components, true);
agx_iter_to(b, vec, I, J, components, perspective);
agx_emit_split(b, dests, vec, components);
}