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nir/lower_tex: Add some helpers for working with tex sources

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Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: "12.0" <mesa-dev@lists.freedesktop.org>
This commit is contained in:
Jason Ekstrand
2016-07-20 20:40:43 -07:00
parent 09135cd55a
commit 843fc8f3e7
1 changed files with 30 additions and 16 deletions
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46
src/compiler/nir/nir_lower_tex.c
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@@ -38,16 +38,39 @@
#include "nir.h"
#include "nir_builder.h"
static int
tex_instr_find_src(nir_tex_instr *tex, nir_tex_src_type src_type)
{
for (unsigned i = 0; i < tex->num_srcs; i++) {
if (tex->src[i].src_type == src_type)
return i;
}
return -1;
}
static void
tex_instr_remove_src(nir_tex_instr *tex, unsigned src_idx)
{
assert(src_idx < tex->num_srcs);
/* First rewrite the source to NIR_SRC_INIT */
nir_instr_rewrite_src(&tex->instr, &tex->src[src_idx].src, NIR_SRC_INIT);
/* Now, move all of the other sources down */
for (unsigned i = src_idx + 1; i < tex->num_srcs; i++) {
tex->src[i-1].src_type = tex->src[i].src_type;
nir_instr_move_src(&tex->instr, &tex->src[i-1].src, &tex->src[i].src);
}
tex->num_srcs--;
}
static void
project_src(nir_builder *b, nir_tex_instr *tex)
{
/* Find the projector in the srcs list, if present. */
unsigned proj_index;
for (proj_index = 0; proj_index < tex->num_srcs; proj_index++) {
if (tex->src[proj_index].src_type == nir_tex_src_projector)
break;
}
if (proj_index == tex->num_srcs)
int proj_index = tex_instr_find_src(tex, nir_tex_src_projector);
if (proj_index < 0)
return;
b->cursor = nir_before_instr(&tex->instr);
@@ -102,16 +125,7 @@ project_src(nir_builder *b, nir_tex_instr *tex)
nir_src_for_ssa(projected));
}
/* Now move the later tex sources down the array so that the projector
* disappears.
*/
nir_instr_rewrite_src(&tex->instr, &tex->src[proj_index].src,
NIR_SRC_INIT);
for (unsigned i = proj_index + 1; i < tex->num_srcs; i++) {
tex->src[i-1].src_type = tex->src[i].src_type;
nir_instr_move_src(&tex->instr, &tex->src[i-1].src, &tex->src[i].src);
}
tex->num_srcs--;
tex_instr_remove_src(tex, proj_index);
}
static nir_ssa_def *