diff options
| -rw-r--r-- | src/glsl/nir/nir.c | 29 | ||||
| -rw-r--r-- | src/glsl/nir/nir.h | 1 |
2 files changed, 30 insertions, 0 deletions
diff --git a/src/glsl/nir/nir.c b/src/glsl/nir/nir.c index e12da805281..c8fc4280f72 100644 --- a/src/glsl/nir/nir.c +++ b/src/glsl/nir/nir.c @@ -1080,6 +1080,35 @@ nir_src_as_const_value(nir_src src) return &load->value; } +/** + * Returns true if the source is known to be dynamically uniform. Otherwise it + * returns false which means it may or may not be dynamically uniform but it + * can't be determined. + */ +bool +nir_src_is_dynamically_uniform(nir_src src) +{ + if (!src.is_ssa) + return false; + + /* Constants are trivially dynamically uniform */ + if (src.ssa->parent_instr->type == nir_instr_type_load_const) + return true; + + /* As are uniform variables */ + if (src.ssa->parent_instr->type == nir_instr_type_intrinsic) { + nir_intrinsic_instr *intr = nir_instr_as_intrinsic(src.ssa->parent_instr); + + if (intr->intrinsic == nir_intrinsic_load_uniform) + return true; + } + + /* XXX: this could have many more tests, such as when a sampler function is + * called with dynamically uniform arguments. + */ + return false; +} + bool nir_srcs_equal(nir_src src1, nir_src src2) { diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index bde9f49a90c..95e219168c1 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -1784,6 +1784,7 @@ bool nir_foreach_dest(nir_instr *instr, nir_foreach_dest_cb cb, void *state); bool nir_foreach_src(nir_instr *instr, nir_foreach_src_cb cb, void *state); nir_const_value *nir_src_as_const_value(nir_src src); +bool nir_src_is_dynamically_uniform(nir_src src); bool nir_srcs_equal(nir_src src1, nir_src src2); void nir_instr_rewrite_src(nir_instr *instr, nir_src *src, nir_src new_src); void nir_instr_move_src(nir_instr *dest_instr, nir_src *dest, nir_src *src); |