zink: emit interpolation decorations for ntv outputs

this matches up with nir internal states pre/post ntv

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5384>

diff --git a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
index eecbca3e5dce559bcf923d9dbe1a2efc34732893..12f82b4e6e003c619bee107d8b4680e84aab0c3a 100644 (file)
--- a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
@@ -349,6 +349,23 @@ emit_output(struct ntv_context *ctx, struct nir_variable *var)
       spirv_builder_emit_component(&ctx->builder, var_id,
                                    var->data.location_frac);
 
+   switch (var->data.interpolation) {
+   case INTERP_MODE_NONE:
+   case INTERP_MODE_SMOOTH: /* XXX spirv doesn't seem to have anything for this */
+      break;
+   case INTERP_MODE_FLAT:
+      spirv_builder_emit_decoration(&ctx->builder, var_id, SpvDecorationFlat);
+      break;
+   case INTERP_MODE_EXPLICIT:
+      spirv_builder_emit_decoration(&ctx->builder, var_id, SpvDecorationExplicitInterpAMD);
+      break;
+   case INTERP_MODE_NOPERSPECTIVE:
+      spirv_builder_emit_decoration(&ctx->builder, var_id, SpvDecorationNoPerspective);
+      break;
+   default:
+      unreachable("unknown interpolation value");
+   }
+
    _mesa_hash_table_insert(ctx->vars, var, (void *)(intptr_t)var_id);
 
    assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));