* constants in as system values and perform the bias/clamp in the shader.
*/
-static void
-mir_lod_errata_body(nir_builder *b, nir_tex_instr *tex)
+static bool
+nir_lod_errata_instr(nir_builder *b, nir_instr *instr, void *data)
{
+ if (instr->type != nir_instr_type_tex)
+ return false;
+
+ nir_tex_instr *tex = nir_instr_as_tex(instr);
+ b->cursor = nir_before_instr(instr);
+
/* The errata only applies to textureLod ("TEXGRD") */
if (tex->op != nir_texop_txl)
- return;
+ return false;
/* Let's grab the sampler parameters */
nir_intrinsic_instr *l = nir_intrinsic_instr_create(b->shader,
nir_ssa_def *min_lod = nir_channel(b, params, 0);
nir_ssa_def *max_lod = nir_channel(b, params, 1);
nir_ssa_def *lod_bias = nir_channel(b, params, 2);
-
+
/* Rewrite the LOD with bias/clamps. Order sensitive. */
for (unsigned i = 0; i < tex->num_srcs; i++) {
if (tex->src[i].src_type != nir_tex_src_lod)
nir_instr_rewrite_src(&tex->instr, &tex->src[i].src,
nir_src_for_ssa(clamped));
}
+
+ return true;
}
bool
midgard_nir_lod_errata(nir_shader *shader)
{
- nir_foreach_function(function, shader) {
- if (!function->impl) continue;
-
- nir_builder b;
- nir_builder_init(&b, function->impl);
-
- nir_foreach_block(block, function->impl) {
- nir_foreach_instr_safe(instr, block) {
- if (instr->type != nir_instr_type_tex) continue;
-
- nir_tex_instr *tex = nir_instr_as_tex(instr);
- b.cursor = nir_before_instr(instr);
- mir_lod_errata_body(&b, tex);
- }
- }
-
- nir_metadata_preserve(function->impl, nir_metadata_block_index | nir_metadata_dominance);
-
- }
- return true;
+ return nir_shader_instructions_pass(shader,
+ nir_lod_errata_instr,
+ nir_metadata_block_index | nir_metadata_dominance,
+ NULL);
}