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nir: use nir_shader_instructions_pass in nir_lower_fb_read

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Changes:
- nir_metadata_preserve(..., nir_metadata_block_index | nir_metadata_dominance)
  is called only when pass makes progress
- nir_metadata_preserve(..., nir_metadata_all) is called when pass doesn't
  make progress

Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12282>
This commit is contained in:
Marcin Ślusarz
2021-08-09 16:06:06 +02:00
committed by Marge Bot
parent 2e410c4c05
commit a87070937d
1 changed files with 25 additions and 43 deletions
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68
src/compiler/nir/nir_lower_fb_read.c
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@@ -46,9 +46,26 @@
* hidden texture to read from the fb.
*/
static void
lower_fb_read(nir_builder *b, nir_intrinsic_instr *intr)
static bool
nir_lower_fb_read_instr(nir_builder *b, nir_instr *instr, UNUSED void *cb_data)
{
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_load_output)
return false;
/* TODO KHR_blend_equation_advanced is limited to non-MRT
* scenarios.. but possible there are other extensions
* where this pass would be useful that do support MRT?
*
* I guess for now I'll leave that as an exercise for the
* reader.
*/
if (nir_intrinsic_base(intr) != 0 || nir_src_as_uint(intr->src[0]) != 0)
return false;
b->cursor = nir_before_instr(&intr->instr);
nir_ssa_def *fragcoord = nir_load_frag_coord(b);
@@ -70,52 +87,17 @@ lower_fb_read(nir_builder *b, nir_intrinsic_instr *intr)
nir_builder_instr_insert(b, &tex->instr);
nir_ssa_def_rewrite_uses(&intr->dest.ssa, &tex->dest.ssa);
return true;
}
bool
nir_lower_fb_read(nir_shader *shader)
{
bool progress = false;
assert(shader->info.stage == MESA_SHADER_FRAGMENT);
nir_foreach_function(function, shader) {
nir_function_impl *impl = function->impl;
if (!impl)
continue;
nir_foreach_block(block, impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_load_output)
continue;
/* TODO KHR_blend_equation_advanced is limited to non-MRT
* scenarios.. but possible there are other extensions
* where this pass would be useful that do support MRT?
*
* I guess for now I'll leave that as an exercise for the
* reader.
*/
if (nir_intrinsic_base(intr) != 0 ||
nir_src_as_uint(intr->src[0]) != 0)
continue;
nir_builder b;
nir_builder_init(&b, impl);
lower_fb_read(&b, intr);
progress = true;
}
}
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
}
return progress;
return nir_shader_instructions_pass(shader, nir_lower_fb_read_instr,
nir_metadata_block_index |
nir_metadata_dominance,
NULL);
}