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zink: simplify shader i/o assignment

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by utilizing a separate slot map for patch variables, the entire i/o
assignment mechanism can be simplified to accurately manage i/o for all
types of variables and avoid location conflicts

affects:
KHR-Single-GL46.enhanced_layouts*

Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15770>
This commit is contained in:
Mike Blumenkrantz 2022-04-05 10:07:54 -04:00 • committed by Marge Bot
parent beb7a9cec5
commit f7ade1f188
1 changed files with 31 additions and 30 deletions
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39
src/gallium/drivers/zink/zink_compiler.c
View file

@ -1075,20 +1075,18 @@ assign_producer_var_io(gl_shader_stage stage, nir_variable *var, unsigned *reser
default:
if (var->data.patch) {
assert(slot >= VARYING_SLOT_PATCH0);
slot = slot - VARYING_SLOT_PATCH0;
} else if (slot >= VARYING_SLOT_VAR0 &&
var->data.mode == nir_var_shader_in &&
stage == MESA_SHADER_TESS_EVAL) {
slot = slot - VARYING_SLOT_VAR0;
} else {
slot -= VARYING_SLOT_PATCH0;
}
if (slot_map[slot] == 0xff) {
assert(*reserved < MAX_VARYING);
slot_map[slot] = *reserved;
if (stage == MESA_SHADER_TESS_EVAL && var->data.mode == nir_var_shader_in && !var->data.patch)
*reserved += glsl_count_vec4_slots(glsl_get_array_element(var->type), false, false);
else
*reserved += glsl_count_vec4_slots(var->type, false, false);
}
slot = slot_map[slot];
assert(slot < MAX_VARYING);
}
var->data.driver_location = slot;
}
}
@ -1124,22 +1122,19 @@ assign_consumer_var_io(gl_shader_stage stage, nir_variable *var, unsigned *reser
default:
if (var->data.patch) {
assert(slot >= VARYING_SLOT_PATCH0);
var->data.driver_location = slot - VARYING_SLOT_PATCH0;
} else if (slot >= VARYING_SLOT_VAR0 &&
stage == MESA_SHADER_TESS_CTRL &&
var->data.mode == nir_var_shader_out)
var->data.driver_location = slot - VARYING_SLOT_VAR0;
else {
slot -= VARYING_SLOT_PATCH0;
}
if (slot_map[slot] == (unsigned char)-1) {
if (!is_texcoord(stage, var))
if (stage != MESA_SHADER_TESS_CTRL && !is_texcoord(stage, var))
/* dead io */
return false;
/* texcoords can't be eliminated in fs due to GL_COORD_REPLACE */
/* - texcoords can't be eliminated in fs due to GL_COORD_REPLACE
* - patch variables may be read in the workgroup
*/
slot_map[slot] = (*reserved)++;
}
var->data.driver_location = slot_map[slot];
}
}
return true;
}
@ -1165,17 +1160,23 @@ rewrite_and_discard_read(nir_builder *b, nir_instr *instr, void *data)
void
zink_compiler_assign_io(nir_shader *producer, nir_shader *consumer)
{
unsigned reserved = 0;
unsigned reserved = 0, patch_reserved = 0;
unsigned char slot_map[VARYING_SLOT_MAX];
memset(slot_map, -1, sizeof(slot_map));
unsigned char patch_slot_map[VARYING_SLOT_MAX];
memset(patch_slot_map, -1, sizeof(patch_slot_map));
bool do_fixup = false;
nir_shader *nir = producer->info.stage == MESA_SHADER_TESS_CTRL ? producer : consumer;
if (producer->info.stage == MESA_SHADER_TESS_CTRL) {
/* never assign from tcs -> tes, always invert */
nir_foreach_variable_with_modes(var, consumer, nir_var_shader_in)
assign_producer_var_io(consumer->info.stage, var, &reserved, slot_map);
assign_producer_var_io(consumer->info.stage, var,
var->data.patch ? &patch_reserved : &reserved,
var->data.patch ? patch_slot_map : slot_map);
nir_foreach_variable_with_modes_safe(var, producer, nir_var_shader_out) {
if (!assign_consumer_var_io(producer->info.stage, var, &reserved, slot_map))
if (!assign_consumer_var_io(producer->info.stage, var,
var->data.patch ? &patch_reserved : &reserved,
var->data.patch ? patch_slot_map : slot_map))
/* this is an output, nothing more needs to be done for it to be dropped */
do_fixup = true;
}