[Mesa-dev] [PATCH v3 031/104] nir: Support deref instructions in lower_pos_center

[Jason Ekstrand]

---
 src/compiler/nir/nir_lower_wpos_center.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/compiler/nir/nir_lower_wpos_center.c b/src/compiler/nir/nir_lower_wpos_center.c
index dca810d..5b68cac 100644
--- a/src/compiler/nir/nir_lower_wpos_center.c
+++ b/src/compiler/nir/nir_lower_wpos_center.c
@@ -81,7 +81,18 @@ lower_wpos_center_block(nir_builder *b, nir_block *block,
    nir_foreach_instr(instr, block) {
       if (instr->type == nir_instr_type_intrinsic) {
          nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
-         if (intr->intrinsic == nir_intrinsic_load_var) {
+         if (intr->intrinsic == nir_intrinsic_load_deref) {
+            nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
+            nir_variable *var = nir_deref_instr_get_variable(deref);
+
+            if (var->data.mode == nir_var_shader_in &&
+                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);
+               progress = true;
+            }
+         } else if (intr->intrinsic == nir_intrinsic_load_var) {
             nir_deref_var *dvar = intr->variables[0];
             nir_variable *var = dvar->var;
 
-- 
2.5.0.400.gff86faf