-uniform float PREFIX(output_coord_to_slice_num);
-uniform float PREFIX(slice_num_to_input_coord);
-uniform float PREFIX(slice_offset_to_input_coord);
-uniform float PREFIX(offset);
+// Implicit uniforms:
+// uniform float PREFIX(output_coord_to_slice_num);
+// uniform float PREFIX(slice_num_to_input_coord);
+// uniform float PREFIX(slice_offset_to_input_coord);
+// uniform float PREFIX(normalized_offset);