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nir/lower_wpos_center: Look at derefs for modes

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This is instead of looking all the way back to the variable which may
not exist for all derefs.  This makes this code properly ignore casts
with modes other than the mode[s] we care about (where casts aren't
allowed).

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This commit is contained in:
Jason Ekstrand 2018-12-13 15:03:28 -06:00
parent 867fe35a16
commit cf7fb39805
1 changed files with 4 additions and 2 deletions
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6
src/compiler/nir/nir_lower_wpos_center.c
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@ -82,10 +82,12 @@ lower_wpos_center_block(nir_builder *b, nir_block *block,
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic == nir_intrinsic_load_deref) {
nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
if (deref->mode != nir_var_shader_in)
continue;
nir_variable *var = nir_deref_instr_get_variable(deref);
if (var->data.mode == nir_var_shader_in &&
var->data.location == VARYING_SLOT_POS) {
if (var->data.location == VARYING_SLOT_POS) {
/* gl_FragCoord should not have array/struct derefs: */
assert(deref->deref_type == nir_deref_type_var);
update_fragcoord(b, intr, for_sample_shading);