[model] Support freeing of skin data

I doubt it's enough, but it does seem to cover what's needed for glsl
(maybe not the actual textures, unsure there, but I think they're
recycled).

include/QF/plugin/vid_render.h

@@ -66,6 +66,7 @@ typedef struct vid_model_funcs_s {
 	int alias_cache;
 	void (*Mod_SpriteLoadFrames) (struct mod_sprite_ctx_s *sprite_ctx);
 
+	void (*Skin_Free) (struct skin_s *skin);
 	struct skin_s *(*Skin_SetColormap) (struct skin_s *skin, int cmap);
 	struct skin_s *(*Skin_SetSkin) (struct skin_s *skin, int cmap,
 									const char *skinname);

include/mod_internal.h

@@ -104,6 +104,7 @@ void Mod_LoadAliasModel (model_t *mod, void *buffer,
 void Mod_LoadSpriteModel (model_t *mod, void *buffer);
 
 void Skin_Init (void);
+void Skin_Free (skin_t *skin);
 skin_t *Skin_SetColormap (skin_t *skin, int cmap);
 skin_t *Skin_SetSkin (skin_t *skin, int cmap, const char *skinname);
 void Skin_SetTranslation (int cmap, int top, int bottom);

libs/models/skin.c

@@ -71,6 +71,14 @@ new_skin (void)
 	return calloc (1, sizeof (skin_t));
 }
 
+VISIBLE void
+Skin_Free (skin_t *skin)
+{
+	if (skin) {
+		free (skin);
+	}
+}
+
 VISIBLE void
 Skin_SetTranslation (int cmap, int top, int bottom)
 {

libs/video/renderer/vid_render_gl.c

@@ -170,6 +170,7 @@ static vid_model_funcs_t model_funcs = {
 	1,
 	gl_Mod_SpriteLoadFrames,
 
+	Skin_Free,
 	Skin_SetColormap,
 	Skin_SetSkin,
 	gl_Skin_SetupSkin,

libs/video/renderer/vid_render_glsl.c

@@ -81,6 +81,7 @@ static vid_model_funcs_t model_funcs = {
 	0,
 	glsl_Mod_SpriteLoadFrames,
 
+	Skin_Free,
 	Skin_SetColormap,
 	Skin_SetSkin,
 	glsl_Skin_SetupSkin,

libs/video/renderer/vid_render_sw.c

@@ -90,6 +90,7 @@ static vid_model_funcs_t model_funcs = {
 	1,
 	sw_Mod_SpriteLoadFrames,
 
+	Skin_Free,
 	Skin_SetColormap,
 	Skin_SetSkin,
 	sw_Skin_SetupSkin,

libs/video/renderer/vid_render_vulkan.c

@@ -654,6 +654,7 @@ static vid_model_funcs_t model_funcs = {
 	0,
 	vulkan_Mod_SpriteLoadFrames,
 
+	Skin_Free,
 	Skin_SetColormap,
 	Skin_SetSkin,
 	vulkan_Skin_SetupSkin,

nq/source/cl_ents.c

@@ -73,6 +73,7 @@ CL_ClearEnts (void)
 
 	for (i = 0; i < MAX_EDICTS; i++) {
 		if (cl_entities[i]) {
+			mod_funcs->Skin_Free (cl_entities[i]->renderer.skin);
 			Scene_DestroyEntity (cl_world.scene, cl_entities[i]);
 			cl_entities[i] = 0;
 		}