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25 #include "nir_builder.h"
27 static nir_intrinsic_instr
*
28 as_intrinsic(nir_instr
*instr
, nir_intrinsic_op op
)
30 if (instr
->type
!= nir_instr_type_intrinsic
)
33 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
34 if (intrin
->intrinsic
!= op
)
40 static nir_intrinsic_instr
*
41 as_set_vertex_count(nir_instr
*instr
)
43 return as_intrinsic(instr
, nir_intrinsic_set_vertex_count
);
47 * If a geometry shader emits a constant number of vertices, return the
48 * number of vertices. Otherwise, return -1 (unknown).
50 * This only works if you've used nir_lower_gs_intrinsics() to do vertex
51 * counting at the NIR level.
54 nir_gs_count_vertices(const nir_shader
*shader
)
58 nir_foreach_function(function
, shader
) {
62 /* set_vertex_count intrinsics only appear in predecessors of the
63 * end block. So we don't need to walk all of them.
65 set_foreach(function
->impl
->end_block
->predecessors
, entry
) {
66 nir_block
*block
= (nir_block
*) entry
->key
;
68 nir_foreach_instr_reverse(instr
, block
) {
69 nir_intrinsic_instr
*intrin
= as_set_vertex_count(instr
);
73 /* We've found a non-constant value. Bail. */
74 if (!nir_src_is_const(intrin
->src
[0]))
78 count
= nir_src_as_int(intrin
->src
[0]);
80 /* We've found contradictory set_vertex_count intrinsics.
81 * This can happen if there are early-returns in main() and
82 * different paths emit different numbers of vertices.
84 if (count
!= nir_src_as_int(intrin
->src
[0]))