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nir/builder: Add a load_system_value helper

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While we're at it, go ahead and make nir_lower_clip use it.

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jason Ekstrand 2015-12-14 18:46:16 -08:00
parent ca5be008bc
commit f6910f072a
2 changed files with 15 additions and 10 deletions
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12
src/glsl/nir/nir_builder.h
View file

@ -322,4 +322,16 @@ nir_store_var(nir_builder *build, nir_variable *var, nir_ssa_def *value)
nir_builder_instr_insert(build, &store->instr);
}
static inline nir_ssa_def *
nir_load_system_value(nir_builder *build, nir_intrinsic_op op, int index)
{
nir_intrinsic_instr *load = nir_intrinsic_instr_create(build->shader, op);
load->num_components = nir_intrinsic_infos[op].dest_components;
load->const_index[0] = index;
nir_ssa_dest_init(&load->instr, &load->dest,
nir_intrinsic_infos[op].dest_components, NULL);
nir_builder_instr_insert(build, &load->instr);
return &load->dest.ssa;
}
#endif /* NIR_BUILDER_H */

13
src/glsl/nir/nir_lower_clip.c
View file

@ -180,18 +180,11 @@ lower_clip_vs(nir_function_impl *impl, unsigned ucp_enables,
for (int plane = 0; plane < MAX_CLIP_PLANES; plane++) {
if (ucp_enables & (1 << plane)) {
nir_intrinsic_instr *ucp;
/* insert intrinsic to fetch ucp[plane]: */
ucp = nir_intrinsic_instr_create(b.shader,
nir_intrinsic_load_user_clip_plane);
ucp->num_components = 4;
ucp->const_index[0] = plane;
nir_ssa_dest_init(&ucp->instr, &ucp->dest, 4, NULL);
nir_builder_instr_insert(&b, &ucp->instr);
nir_ssa_def *ucp =
nir_load_system_value(&b, nir_intrinsic_load_user_clip_plane, plane);
/* calculate clipdist[plane] - dot(ucp, cv): */
clipdist[plane] = nir_fdot4(&b, &ucp->dest.ssa, cv);
clipdist[plane] = nir_fdot4(&b, ucp, cv);
}
else {
/* 0.0 == don't-clip == disabled: */