From 4ff4acb8c51acf1db6ffadff5bbaf5c7a8943538 Mon Sep 17 00:00:00 2001
From: Kevin Shanahan <kmshanah@disenchant.net>
Date: Tue, 5 Mar 2013 12:01:15 +1030
Subject: [PATCH] qbsp: create a skip flag for SKIP textures

Signed-off-by: Kevin Shanahan <kmshanah@disenchant.net>
---
 qbsp/map.c  | 35 +++++++++++++++++++----------------
 qbsp/qbsp.h |  5 +++--
 2 files changed, 22 insertions(+), 18 deletions(-)

diff --git a/qbsp/map.c b/qbsp/map.c
index 6d13f247..3adad7b6 100644
--- a/qbsp/map.c
+++ b/qbsp/map.c
@@ -62,43 +62,46 @@ Returns a global texinfo number
 ===============
 */
 static int
-FindTexinfo(texinfo_t *t)
+FindTexinfo(texinfo_t *texinfo)
 {
-    int i, j;
-    texinfo_t *tex;
-    const char *name;
+    int index, j;
+    texinfo_t *target;
+    const char *texname;
+    const int num_texinfo = pWorldEnt->lumps[BSPTEXINFO].index;
 
     // set the special flag
-    name = map.miptex[t->miptex];
-    if (name[0] == '*' || !strncasecmp(name, "sky", 3))
+    texname = map.miptex[texinfo->miptex];
+    if (texname[0] == '*' || !strncasecmp(texname, "sky", 3))
 	if (!options.fSplitspecial)
-	    t->flags |= TEX_SPECIAL;
+	    texinfo->flags |= TEX_SPECIAL;
+    if (!strcasecmp(texname, "skip"))
+	texinfo->flags |= TEX_SKIP;
 
-    tex = pWorldEnt->lumps[BSPTEXINFO].data;
-    for (i = 0; i < pWorldEnt->lumps[BSPTEXINFO].index; i++, tex++) {
-	if (t->miptex != tex->miptex)
+    target = pWorldEnt->lumps[BSPTEXINFO].data;
+    for (index = 0; index < num_texinfo; index++, target++) {
+	if (texinfo->miptex != target->miptex)
 	    continue;
-	if (t->flags != tex->flags)
+	if (texinfo->flags != target->flags)
 	    continue;
 
 	for (j = 0; j < 4; j++) {
-	    if (t->vecs[0][j] != tex->vecs[0][j])
+	    if (texinfo->vecs[0][j] != target->vecs[0][j])
 		break;
-	    if (t->vecs[1][j] != tex->vecs[1][j])
+	    if (texinfo->vecs[1][j] != target->vecs[1][j])
 		break;
 	}
 	if (j != 4)
 	    continue;
 
-	return i;
+	return index;
     }
 
     /* Allocate a new texinfo at the end of the array */
-    *tex = *t;
+    *target = *texinfo;
     pWorldEnt->lumps[BSPTEXINFO].index++;
     map.cTotal[BSPTEXINFO]++;
 
-    return i;
+    return index;
 }
 
 
diff --git a/qbsp/qbsp.h b/qbsp/qbsp.h
index ad643d9d..3fa66235 100644
--- a/qbsp/qbsp.h
+++ b/qbsp/qbsp.h
@@ -97,8 +97,9 @@
 // Special contents flags for the compiler only
 #define CFLAGS_DETAIL	(1U << 0)
 
-// flag for textures, sky or slime, no lightmap or 256 subdivision
-#define	TEX_SPECIAL	1
+// Texture flags
+#define	TEX_SPECIAL (1U << 0)	/* sky or liquid (no lightmap or subdivision */
+#define	TEX_SKIP    (1U << 1)	/* an invisible surface */
 
 #define	MAXLIGHTMAPS	4