vk: rt: allow hiding all SURF_DRAWSKY surfaces while retaining skybox

Neede for getting rid of some skybox 𝘱𝘦𝘯𝘦𝘵𝘳𝘢𝘵𝘪𝘰𝘯 glitches, see #579

ref/vk/TODO.md

@@ -1,4 +1,4 @@
-# 2023-12-14 E346
+# 2023-12-14 E346-E347
 - [x] Optimize skybox loading, #706
     - [x] Do not load skybox when there are no SURF_DRAWSKY, #579
     - [x] Do not reload the same skybox

ref/vk/data/valve/luchiki/maps/c2a5.patch

@@ -1,7 +1,8 @@
-{
-"_xvk_ent_id" "246" // DANGER sign
-"origin" "1 0 0"
-}
-{
-"_xvk_smoothing_threshold" "54" // FIXME
-}
+{
+"_xvk_ent_id" "246" // DANGER sign
+"origin" "1 0 0"
+}
+{
+"_xvk_smoothing_threshold" "54" // FIXME
+"_xvk_remove_all_sky_surfaces" "1"
+}

ref/vk/vk_brush.c

@@ -995,6 +995,10 @@ static model_sizes_t computeSizes( const model_t *mod, qboolean is_worldmodel )
 			break;
 		case BrushSurface_Sky:
 			sizes.sky_surfaces_count++;
+
+			// Do not count towards surfaces that we'll load (still need to count if for the purpose of loading skybox)
+			if (g_map_entities.remove_all_sky_surfaces)
+				continue;
 			break;
 		case BrushSurface_Regular:
 			break;
@@ -1321,8 +1325,10 @@ static qboolean fillBrushSurfaces(fill_geometries_args_t args) {
 				break;
 			case BrushSurface_Conveyor:
 				break;
-			case BrushSurface_Regular:
 			case BrushSurface_Sky:
+				if (g_map_entities.remove_all_sky_surfaces)
+					continue;
+			case BrushSurface_Regular:
 				break;
 			}
 

ref/vk/vk_mapents.c

@@ -733,6 +733,11 @@ static void parseEntities( char *string, qboolean is_patch ) {
 							if (have_fields & Field__xvk_smoothing_group) {
 								addSmoothingGroup(&values);
 							}
+
+							if (have_fields & Field__xvk_remove_all_sky_surfaces) {
+								DEBUG("_xvk_remove_all_sky_surfaces=%d", values._xvk_remove_all_sky_surfaces);
+								g_map_entities.remove_all_sky_surfaces = values._xvk_remove_all_sky_surfaces;
+							}
 						}
 					}
 					break;

ref/vk/vk_mapents.h

@@ -37,6 +37,7 @@
 	X(25, int, _xvk_smooth_entire_model, Int) \
 	X(26, int_array_t, _xvk_smoothing_excluded, IntArray) \
 	X(27, float, _xvk_tex_rotate, Float) \
+	X(28, int, _xvk_remove_all_sky_surfaces, Int) \
 
 /* NOTE: not used
 	X(23, int, renderamt, Int) \
@@ -175,6 +176,8 @@ typedef struct {
 		int excluded_count;
 		int excluded[MAX_EXCLUDED_SMOOTHING_SURFACES];
 	} smoothing;
+
+	qboolean remove_all_sky_surfaces;
 } xvk_map_entities_t;
 
 // TODO expose a bunch of things here as funtions, not as internal structures