radeonsi/nir: lower uniforms to UBO loads

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/drivers/radeonsi/si_shader_nir.c

@@ -32,6 +32,12 @@
 #include "compiler/nir_types.h"
 
 
+static int
+type_size(const struct glsl_type *type)
+{
+   return glsl_count_attribute_slots(type, false);
+}
+
 static void scan_instruction(struct tgsi_shader_info *info,
 			     nir_instr *instr)
 {
@@ -345,6 +351,10 @@ si_lower_nir(struct si_shader_selector* sel)
 	 * - ensure constant offsets for texture instructions are folded
 	 *   and copy-propagated
 	 */
+	NIR_PASS_V(sel->nir, nir_lower_io, nir_var_uniform, type_size,
+		   (nir_lower_io_options)0);
+	NIR_PASS_V(sel->nir, nir_lower_uniforms_to_ubo);
+
 	NIR_PASS_V(sel->nir, nir_lower_returns);
 	NIR_PASS_V(sel->nir, nir_lower_vars_to_ssa);
 	NIR_PASS_V(sel->nir, nir_lower_alu_to_scalar);