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nir/lower_io: change INTERP_MODE_NONE to SMOOTH when NONE means SMOOTH

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to improve CSE of load_barycentric_* and IO vectorization.
This is only for load_interpolated_input, which can never be FLAT.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31968>
This commit is contained in:
Marek Olšák 2024-10-31 16:48:27 -04:00 • committed by Marge Bot
parent aee1ebb992
commit b71edce77a
1 changed files with 25 additions and 2 deletions
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27
src/compiler/nir/nir_lower_io.c
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@ -282,6 +282,29 @@ is_medium_precision(const nir_shader *shader, const nir_variable *var)
var->data.precision == GLSL_PRECISION_LOW;
}
static enum glsl_interp_mode
get_interp_mode(const nir_variable *var)
{
unsigned interp_mode = var->data.interpolation;
/* INTERP_MODE_NONE is an artifact of OpenGL. Change it to SMOOTH
* to enable CSE between load_barycentric_pixel(NONE->SMOOTH) and
* load_barycentric_pixel(SMOOTH), which also enables IO vectorization when
* one component originally had NONE and an adjacent component had SMOOTH.
*
* Color varyings must preserve NONE. NONE for colors means that
* glShadeModel determines the interpolation mode.
*/
if (var->data.location != VARYING_SLOT_COL0 &&
var->data.location != VARYING_SLOT_COL1 &&
var->data.location != VARYING_SLOT_BFC0 &&
var->data.location != VARYING_SLOT_BFC1 &&
interp_mode == INTERP_MODE_NONE)
return INTERP_MODE_SMOOTH;
return interp_mode;
}
static nir_def *
emit_load(struct lower_io_state *state,
nir_def *array_index, nir_variable *var, nir_def *offset,
@ -316,7 +339,7 @@ emit_load(struct lower_io_state *state,
bary_op = nir_intrinsic_load_barycentric_pixel;
barycentric = nir_load_barycentric(&state->builder, bary_op,
var->data.interpolation);
get_interp_mode(var));
op = nir_intrinsic_load_interpolated_input;
}
} else {
@ -629,7 +652,7 @@ lower_interpolate_at(nir_intrinsic_instr *intrin, struct lower_io_state *state,
nir_intrinsic_instr_create(state->builder.shader, bary_op);
nir_def_init(&bary_setup->instr, &bary_setup->def, 2, 32);
nir_intrinsic_set_interp_mode(bary_setup, var->data.interpolation);
nir_intrinsic_set_interp_mode(bary_setup, get_interp_mode(var));
if (intrin->intrinsic == nir_intrinsic_interp_deref_at_sample ||
intrin->intrinsic == nir_intrinsic_interp_deref_at_offset ||