st/gui: Better conversion sinks

src/xrt/state_trackers/gui/gui_scene_calibrate.c

@@ -237,16 +237,15 @@ scene_render_select(struct gui_scene *scene, struct gui_program *p)
 
 	p->texs[p->num_texs++] =
 	    gui_ogl_sink_create("Calibration", cs->xfctx, &rgb);
-	u_sink_create_format_converter(cs->xfctx, XRT_FORMAT_R8G8B8, rgb, &rgb);
+	u_sink_create_to_r8g8b8_or_l8(cs->xfctx, rgb, &rgb);
 	u_sink_queue_create(cs->xfctx, rgb, &rgb);
 
 	p->texs[p->num_texs++] = gui_ogl_sink_create("Raw", cs->xfctx, &raw);
-	u_sink_create_format_converter(cs->xfctx, XRT_FORMAT_R8G8B8, raw, &raw);
+	u_sink_create_to_r8g8b8_or_l8(cs->xfctx, raw, &raw);
 	u_sink_queue_create(cs->xfctx, raw, &raw);
 
 	t_calibration_stereo_create(cs->xfctx, &cs->params, &cs->status, rgb,
 	                            &cali);
-	u_sink_create_to_yuv_or_yuyv(cs->xfctx, cali, &cali);
 	u_sink_queue_create(cs->xfctx, cali, &cali);
 	u_sink_split_create(cs->xfctx, raw, cali, &cali);