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nir: generate lowered IO in nir_lower_passthrough_edgeflags

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Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6442>
This commit is contained in:
Marek Olšák
2020-08-13 10:27:57 -04:00
committed by Marge Bot
parent 7980f3e519
commit 484a60d547
1 changed files with 47 additions and 2 deletions
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49
src/compiler/nir/nir_lower_passthrough_edgeflags.c
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@@ -35,12 +35,57 @@ lower_impl(nir_function_impl *impl)
nir_builder_init(&b, impl);
b.cursor = nir_before_cf_list(&impl->body);
/* The edge flag is the last input in st/mesa. */
assert(shader->num_inputs == util_bitcount64(shader->info.inputs_read));
assert(shader->num_outputs == util_bitcount64(shader->info.outputs_written));
/* Lowered IO only uses intrinsics. It doesn't use variables. */
if (shader->info.io_lowered) {
/* Load an edge flag. */
nir_intrinsic_instr *load =
nir_intrinsic_instr_create(shader, nir_intrinsic_load_input);
load->num_components = 1;
load->src[0] = nir_src_for_ssa(nir_imm_int(&b, 0));
nir_ssa_dest_init(&load->instr, &load->dest,
load->num_components, 32, NULL);
nir_intrinsic_set_base(load, shader->num_inputs++);
nir_intrinsic_set_component(load, 0);
nir_intrinsic_set_type(load, nir_type_float32);
nir_io_semantics load_sem = {0};
load_sem.location = VERT_ATTRIB_EDGEFLAG;
load_sem.num_slots = 1;
nir_intrinsic_set_io_semantics(load, load_sem);
nir_builder_instr_insert(&b, &load->instr);
/* Store an edge flag. */
nir_intrinsic_instr *store =
nir_intrinsic_instr_create(shader, nir_intrinsic_store_output);
store->num_components = 1;
store->src[0] = nir_src_for_ssa(&load->dest.ssa);
store->src[1] = nir_src_for_ssa(nir_imm_int(&b, 0));
nir_intrinsic_set_base(store, shader->num_outputs++);
nir_intrinsic_set_component(store, 0);
nir_intrinsic_set_type(store, nir_type_float32);
nir_intrinsic_set_write_mask(store, 0x1);
nir_io_semantics semantics = {0};
semantics.location = VARYING_SLOT_EDGE;
semantics.num_slots = 1;
nir_intrinsic_set_io_semantics(store, semantics);
nir_builder_instr_insert(&b, &store->instr);
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
return;
}
in = nir_variable_create(shader, nir_var_shader_in,
glsl_vec4_type(), "edgeflag_in");
in->data.location = VERT_ATTRIB_EDGEFLAG;
/* The edge flag is the last input in st/mesa. */
assert(shader->num_inputs == util_bitcount64(shader->info.inputs_read));
in->data.driver_location = shader->num_inputs++;
shader->info.inputs_read |= BITFIELD64_BIT(VERT_ATTRIB_EDGEFLAG);