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25 #include "nir_builder.h"
28 lower_impl(nir_function_impl
*impl
)
30 nir_shader
*shader
= impl
->function
->shader
;
32 nir_variable
*in
, *out
;
35 nir_builder_init(&b
, impl
);
36 b
.cursor
= nir_before_cf_list(&impl
->body
);
38 /* The edge flag is the last input in st/mesa. */
39 assert(shader
->num_inputs
== util_bitcount64(shader
->info
.inputs_read
));
41 /* Lowered IO only uses intrinsics. It doesn't use variables. */
42 if (shader
->info
.io_lowered
) {
43 assert(shader
->num_outputs
==
44 util_bitcount64(shader
->info
.outputs_written
));
46 /* Load an edge flag. */
47 nir_intrinsic_instr
*load
=
48 nir_intrinsic_instr_create(shader
, nir_intrinsic_load_input
);
49 load
->num_components
= 1;
50 load
->src
[0] = nir_src_for_ssa(nir_imm_int(&b
, 0));
51 nir_ssa_dest_init(&load
->instr
, &load
->dest
,
52 load
->num_components
, 32, NULL
);
54 nir_intrinsic_set_base(load
, shader
->num_inputs
++);
55 nir_intrinsic_set_component(load
, 0);
56 nir_intrinsic_set_type(load
, nir_type_float32
);
58 nir_io_semantics load_sem
= {0};
59 load_sem
.location
= VERT_ATTRIB_EDGEFLAG
;
60 load_sem
.num_slots
= 1;
61 nir_intrinsic_set_io_semantics(load
, load_sem
);
62 nir_builder_instr_insert(&b
, &load
->instr
);
64 /* Store an edge flag. */
65 nir_intrinsic_instr
*store
=
66 nir_intrinsic_instr_create(shader
, nir_intrinsic_store_output
);
67 store
->num_components
= 1;
68 store
->src
[0] = nir_src_for_ssa(&load
->dest
.ssa
);
69 store
->src
[1] = nir_src_for_ssa(nir_imm_int(&b
, 0));
71 nir_intrinsic_set_base(store
, shader
->num_outputs
++);
72 nir_intrinsic_set_component(store
, 0);
73 nir_intrinsic_set_type(store
, nir_type_float32
);
74 nir_intrinsic_set_write_mask(store
, 0x1);
76 nir_io_semantics semantics
= {0};
77 semantics
.location
= VARYING_SLOT_EDGE
;
78 semantics
.num_slots
= 1;
79 nir_intrinsic_set_io_semantics(store
, semantics
);
80 nir_builder_instr_insert(&b
, &store
->instr
);
82 nir_metadata_preserve(impl
, nir_metadata_block_index
|
83 nir_metadata_dominance
);
87 in
= nir_variable_create(shader
, nir_var_shader_in
,
88 glsl_vec4_type(), "edgeflag_in");
89 in
->data
.location
= VERT_ATTRIB_EDGEFLAG
;
91 in
->data
.driver_location
= shader
->num_inputs
++;
92 shader
->info
.inputs_read
|= BITFIELD64_BIT(VERT_ATTRIB_EDGEFLAG
);
94 out
= nir_variable_create(shader
, nir_var_shader_out
,
95 glsl_vec4_type(), "edgeflag_out");
96 out
->data
.location
= VARYING_SLOT_EDGE
;
98 def
= nir_load_var(&b
, in
);
99 nir_store_var(&b
, out
, def
, 0xf);
101 nir_metadata_preserve(impl
, nir_metadata_block_index
|
102 nir_metadata_dominance
);
105 void nir_lower_passthrough_edgeflags(nir_shader
*shader
)
107 lower_impl(nir_shader_get_entrypoint(shader
));