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asahi,agx: Don't set PIPE_CAP_POINT_COORD_ORIGIN_UPPER_LEFT

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Tell the state tracker our point coordinates have a lower left origin
instead of an upper left origin, and remove our point coordinate
flipping code. Saves an instruction in any shader that reads
gl_PointCoord.y

Note: the OpenGL blob also emits an "fadd $y', ^y.neg, 1.0" to flip
point coordinates, so this isn't just a Metal weirdness.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16829>
This commit is contained in:
Alyssa Rosenzweig 2022-05-21 23:22:27 -04:00 committed by Marge Bot
parent e749f67f89
commit 2338dcd392
2 changed files with 1 additions and 38 deletions
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38
src/asahi/compiler/agx_compile.c
View File

@ -1406,39 +1406,6 @@ agx_lower_front_face(struct nir_builder *b,
return true;
}
static bool
agx_lower_point_coord(struct nir_builder *b,
nir_instr *instr, UNUSED void *data)
{
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_load_deref)
return false;
nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
nir_variable *var = nir_deref_instr_get_variable(deref);
if (var->data.mode != nir_var_shader_in)
return false;
if (var->data.location != VARYING_SLOT_PNTC)
return false;
assert(intr->dest.is_ssa);
assert(intr->dest.ssa.num_components == 2);
b->cursor = nir_after_instr(&intr->instr);
nir_ssa_def *def = nir_load_deref(b, deref);
nir_ssa_def *y = nir_channel(b, def, 1);
nir_ssa_def *flipped_y = nir_fadd_imm(b, nir_fneg(b, y), 1.0);
nir_ssa_def *flipped = nir_vec2(b, nir_channel(b, def, 0), flipped_y);
nir_ssa_def_rewrite_uses(&intr->dest.ssa, flipped);
return true;
}
static bool
agx_lower_aligned_offsets(struct nir_builder *b,
nir_instr *instr, UNUSED void *data)
@ -1684,11 +1651,6 @@ agx_compile_shader_nir(nir_shader *nir,
/* Lower from OpenGL [-1, 1] to [0, 1] if half-z is not set */
if (!key->vs.clip_halfz)
NIR_PASS_V(nir, nir_lower_clip_halfz);
} else if (ctx->stage == MESA_SHADER_FRAGMENT) {
/* Flip point coordinate since OpenGL and Metal disagree */
NIR_PASS_V(nir, nir_shader_instructions_pass,
agx_lower_point_coord,
nir_metadata_block_index | nir_metadata_dominance, NULL);
}
NIR_PASS_V(nir, nir_split_var_copies);

1
src/gallium/drivers/asahi/agx_pipe.c
View File

@ -818,6 +818,7 @@ agx_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
case PIPE_CAP_SEAMLESS_CUBE_MAP:
case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
return true;
case PIPE_CAP_POINT_COORD_ORIGIN_UPPER_LEFT:
case PIPE_CAP_FS_POINT_IS_SYSVAL:
return false;