From 45257e7d7366b9020de3d6aa1402b264c7ebc029 Mon Sep 17 00:00:00 2001
From: Ian <motolegacy.git@gmail.com>
Date: Wed, 21 Dec 2022 15:05:34 -0500
Subject: [PATCH] Force use of external Zombie skins and override MDL loading

---
 source/gl_model.c | 36 ++++++++++++++++++++++++++++++++++++
 source/gl_rmisc.c |  8 ++++++++
 2 files changed, 44 insertions(+)

diff --git a/source/gl_model.c b/source/gl_model.c
index 418a6db..3a7db43 100644
--- a/source/gl_model.c
+++ b/source/gl_model.c
@@ -2448,11 +2448,29 @@ void Mod_FloodFillSkin( byte *skin, int skinwidth, int skinheight )
 	}
 }
 
+qboolean model_is_zombie(char name[MAX_QPATH])
+{
+	if (Q_strcmp(name, "models/ai/zbod.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zcbod.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zcfull.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zchead.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zclarm.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zcrarm.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zfull.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zhead.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zlarm.mdl") == 0 ||
+	Q_strcmp(name, "models/ai/zrarm.mdl") == 0)
+		return qtrue;
+
+	return qfalse;
+}
+
 /*
 ===============
 Mod_LoadAllSkins
 ===============
 */
+extern gltexture_t *zombie_skins[4];
 void *Mod_LoadAllSkins (int numskins, daliasskintype_t *pskintype)
 {
 	int			i, j, k, size, groupskins;
@@ -2474,6 +2492,24 @@ void *Mod_LoadAllSkins (int numskins, daliasskintype_t *pskintype)
 	if (loadmodel->flags & MF_HOLEY)
 		texflags |= TEXPREF_ALPHA;
 
+	if (model_is_zombie(loadmodel->name) == qtrue) {
+		Mod_FloodFillSkin(skin, pheader->skinwidth, pheader->skinheight);
+		
+		// save 8 bit texels for the player model to remap
+		texels = (byte *) Hunk_AllocName(size, loadname);
+		pheader->texels[i] = texels - (byte *)pheader;
+		memcpy (texels, (byte *)(pskintype + 1), size);
+
+		// force-fill 4 skin slots
+		for (int i = 0; i < 4; i++) {
+			pheader->gltextures[i][0] = zombie_skins[i];
+			pheader->fbtextures[i][0] = NULL;
+		}
+
+		pskintype = (daliasskintype_t *)((byte *)(pskintype+1) + s);
+		return (void *)pskintype;
+	}
+
 	for (i=0 ; i<numskins ; i++)
 	{
 		if (pskintype->type == ALIAS_SKIN_SINGLE)
diff --git a/source/gl_rmisc.c b/source/gl_rmisc.c
index a16f1cb..e1c8977 100644
--- a/source/gl_rmisc.c
+++ b/source/gl_rmisc.c
@@ -59,6 +59,8 @@ gltexture_t *decal_burn;
 gltexture_t *decal_mark;
 gltexture_t *decal_glow;
 
+gltexture_t *zombie_skins[4];
+
 
 /*
 ====================
@@ -676,5 +678,11 @@ void	R_InitOtherTextures (void)
 	decal_burn	  = loadtextureimage ("textures/decals/explo_burn01");
 	decal_mark	  = loadtextureimage ("textures/decals/particle_burn01");
 	decal_glow	  = loadtextureimage ("textures/decals/glow2");
+
+	// external zombie skins
+	zombie_skins[0] = loadtextureimage ("models/ai/zfull.mdl_0", 0, 0, qtrue, qtrue);
+	zombie_skins[1] = loadtextureimage ("models/ai/zfull.mdl_1", 0, 0, qtrue, qtrue);
+	zombie_skins[2] = loadtextureimage ("models/ai/zfull.mdl_2", 0, 0, qtrue, qtrue);
+	zombie_skins[3] = loadtextureimage ("models/ai/zfull.mdl_3", 0, 0, qtrue, qtrue);
 }