From 98a66204b9d264295126f7d9856917052417e656 Mon Sep 17 00:00:00 2001
From: viciious <vluchits@gmail.com>
Date: Sun, 10 Dec 2023 14:11:23 +0300
Subject: [PATCH] Merge side and ofset in seg_t

---
 p_setup.c  |  9 ++++++---
 p_sight.c  |  2 +-
 r_local.h  |  5 ++---
 r_phase1.c | 11 ++++++-----
 4 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/p_setup.c b/p_setup.c
index 058e9fa0f4..32ab7e3234 100644
--- a/p_setup.c
+++ b/p_setup.c
@@ -110,13 +110,16 @@ void P_LoadSegs (int lump)
 					
 		li->angle = LITTLESHORT(ml->angle);
 		angle = LITTLESHORT(ml->angle)<<16;
-		li->offset = LITTLESHORT(ml->offset);
+		li->sideoffset = LITTLESHORT(ml->offset);
 		linedef = LITTLESHORT(ml->linedef);
 
 		li->linedef = linedef;
 		ldef = &lines[linedef];
 		side = LITTLESHORT(ml->side);
-		li->side = side;
+		side &= 1;
+
+		li->sideoffset <<= 1;
+		li->sideoffset |= side;
 
 		if (ldef->v1 == li->v1)
 			ldef->fineangle = angle >> ANGLETOFINESHIFT;
@@ -526,7 +529,7 @@ void P_GroupLines (void)
 
 		seg = &segs[ss->firstline];
 		linedef = &lines[seg->linedef];
-		sidedef = &sides[linedef->sidenum[seg->side]];
+		sidedef = &sides[linedef->sidenum[seg->sideoffset & 1]];
 		ss->sector = &sectors[sidedef->sector];
 	}
 
diff --git a/p_sight.c b/p_sight.c
index 9dcb6a30ea..69ded44055 100644
--- a/p_sight.c
+++ b/p_sight.c
@@ -226,7 +226,7 @@ static boolean PS_CrossSubsector(sightWork_t *sw, int num)
          return false;
 
       // crosses a two sided line
-      side = seg->side;
+      side = seg->sideoffset & 1;
       front = &sectors[sides[line->sidenum[side]].sector];
       back = &sectors[sides[line->sidenum[side^1]].sector];
 
diff --git a/r_local.h b/r_local.h
index 619e690799..acf420cb8c 100644
--- a/r_local.h
+++ b/r_local.h
@@ -120,10 +120,9 @@ typedef struct subsector_s
 
 typedef struct seg_s
 {
-	VINT 		side;
-	VINT            v1, v2;
+	VINT 		v1, v2;
 	VINT 		angle;
-	VINT		offset;
+	VINT		sideoffset;
 	VINT		linedef;
 } seg_t;
 
diff --git a/r_phase1.c b/r_phase1.c
index e8b4c5907f..3eaabf41dc 100644
--- a/r_phase1.c
+++ b/r_phase1.c
@@ -185,13 +185,14 @@ static void R_WallEarlyPrep(viswall_t* segl, fixed_t *floorheight,
    int        b_texturemid, t_texturemid;
    boolean    skyhack;
    int        actionbits;
-   int        side;
+   int        side, offset;
 
    {
       seg  = segl->seg;
       li   = &lines[seg->linedef];
-      side = seg->side;
-      si   = &sides[li->sidenum[seg->side]];
+      side = seg->sideoffset & 1;
+      offset = seg->sideoffset >> 1;
+      si   = &sides[li->sidenum[side]];
 
       li->flags |= ML_MAPPED; // mark as seen
 
@@ -346,7 +347,7 @@ static void R_WallEarlyPrep(viswall_t* segl, fixed_t *floorheight,
       segl->t_texturemid  = t_texturemid;
       segl->b_texturemid  = b_texturemid;
       segl->seglightlevel = (lightshift << 8) | f_lightlevel;
-      segl->offset        = ((fixed_t)si->textureoffset + seg->offset) << 16;
+      segl->offset        = ((fixed_t)si->textureoffset + offset) << 16;
    }
 }
 
@@ -528,7 +529,7 @@ static void R_AddLine(rbspWork_t *rbsp, sector_t *frontsector, seg_t *line)
    x1 = x1 >>    16;
 
    // decide which clip routine to use
-   side = line->side;
+   side = line->sideoffset & 1;
    ldef = &lines[line->linedef];
    backsector = (ldef->flags & ML_TWOSIDED) ? &sectors[sides[ldef->sidenum[side^1]].sector] : 0;
    sidedef = &sides[ldef->sidenum[side]];