Sprite offset code

src/lua_mobjlib.c

@@ -87,7 +87,10 @@ enum mobj_e {
 #endif
 	mobj_colorized,
 	mobj_shadowscale,
-	mobj_whiteshadow
+	mobj_whiteshadow,
+	mobj_sprxoff,
+	mobj_spryoff,
+	mobj_sprzoff
 };
 
 static const char *const mobj_opt[] = {
@@ -153,6 +156,9 @@ static const char *const mobj_opt[] = {
 	"colorized",
 	"shadowscale",
 	"whiteshadow",
+	"sprxoff",
+	"spryoff",
+	"sprzoff",
 	NULL};
 
 #define UNIMPLEMENTED luaL_error(L, LUA_QL("mobj_t") " field " LUA_QS " is not implemented for Lua and cannot be accessed.", mobj_opt[field])
@@ -370,6 +376,15 @@ static int mobj_get(lua_State *L)
 	case mobj_whiteshadow:
 		lua_pushboolean(L, mo->whiteshadow);
 		break;
+	case mobj_sprxoff:
+		lua_pushfixed(L, mo->sprxoff);
+		break;
+	case mobj_spryoff:
+		lua_pushfixed(L, mo->spryoff);
+		break;
+	case mobj_sprzoff:
+		lua_pushfixed(L, mo->sprzoff);
+		break;
 	default: // extra custom variables in Lua memory
 		lua_getfield(L, LUA_REGISTRYINDEX, LREG_EXTVARS);
 		I_Assert(lua_istable(L, -1));
@@ -693,6 +708,15 @@ static int mobj_set(lua_State *L)
 	case mobj_whiteshadow:
 		mo->whiteshadow = luaL_checkboolean(L, 3);
 		break;
+	case mobj_sprxoff:
+		mo->sprxoff = luaL_checkfixed(L, 3);
+		break;
+	case mobj_spryoff:
+		mo->spryoff = luaL_checkfixed(L, 3);
+		break;
+	case mobj_sprzoff:
+		mo->sprzoff = luaL_checkfixed(L, 3);
+		break;
 	default:
 		lua_getfield(L, LUA_REGISTRYINDEX, LREG_EXTVARS);
 		I_Assert(lua_istable(L, -1));

src/p_mobj.h

@@ -378,6 +378,8 @@ typedef struct mobj_s
 	fixed_t shadowscale; // If this object casts a shadow, and the size relative to radius
 	boolean whiteshadow; // Use white shadow, set to true by default for fullbright objects
 
+	fixed_t sprxoff, spryoff, sprzoff; // Sprite offsets in real space, does NOT affect position or collision
+
 	// WARNING: New fields must be added separately to savegame and Lua.
 } mobj_t;
 

src/p_user.c

@@ -1674,6 +1674,10 @@ mobj_t *P_SpawnGhostMobj(mobj_t *mobj)
 	ghost->modeltilt = mobj->modeltilt;
 #endif
 
+	ghost->sprxoff = mobj->sprxoff;
+	ghost->spryoff = mobj->spryoff;
+	ghost->sprzoff = mobj->sprzoff;
+
 	if (mobj->flags2 & MF2_OBJECTFLIP)
 		ghost->flags |= MF2_OBJECTFLIP;
 

src/r_things.c

@@ -1435,6 +1435,10 @@ static void R_ProjectDropShadow(mobj_t *thing, vissprite_t *vis, fixed_t scale,
 //
 static void R_ProjectSprite(mobj_t *thing)
 {
+	const fixed_t thingxpos = thing->x + thing->sprxoff;
+	const fixed_t thingypos = thing->y + thing->spryoff;
+	const fixed_t thingzpos = thing->z + thing->sprzoff;
+
 	fixed_t tr_x, tr_y;
 	fixed_t gxt, gyt;
 	fixed_t tx, tz;
@@ -1471,8 +1475,8 @@ static void R_ProjectSprite(mobj_t *thing)
 	fixed_t this_scale = thing->scale;
 
 	// transform the origin point
-	tr_x = thing->x - viewx;
-	tr_y = thing->y - viewy;
+	tr_x = thingxpos - viewx;
+	tr_y = thingypos - viewy;
 
 	gxt = FixedMul(tr_x, viewcos);
 	gyt = -FixedMul(tr_y, viewsin);
@@ -1538,9 +1542,9 @@ static void R_ProjectSprite(mobj_t *thing)
 	if (sprframe->rotate != SRF_SINGLE || papersprite)
 	{
 		if (thing->player)
-			ang = R_PointToAngle (thing->x, thing->y) - thing->player->frameangle;
+			ang = R_PointToAngle (thingxpos, thingypos) - thing->player->frameangle;
 		else
-			ang = R_PointToAngle (thing->x, thing->y) - thing->angle;
+			ang = R_PointToAngle (thingxpos, thingypos) - thing->angle;
 	}
 
 	if (sprframe->rotate == SRF_SINGLE)
@@ -1553,7 +1557,7 @@ static void R_ProjectSprite(mobj_t *thing)
 	else
 	{
 		// choose a different rotation based on player view
-		//ang = R_PointToAngle (thing->x, thing->y) - thing->angle;
+		//ang = R_PointToAngle (thingxpos, thingypos) - thing->angle;
 
 		if ((ang < ANGLE_180) && (sprframe->rotate & SRF_RIGHT)) // See from right
 			rot = 6; // F7 slot
@@ -1700,7 +1704,7 @@ static void R_ProjectSprite(mobj_t *thing)
 		if (x2 < portalclipstart || x1 > portalclipend)
 			return;
 
-		if (P_PointOnLineSide(thing->x, thing->y, portalclipline) != 0)
+		if (P_PointOnLineSide(thingxpos, thingypos, portalclipline) != 0)
 			return;
 	}
 
@@ -1710,12 +1714,12 @@ static void R_ProjectSprite(mobj_t *thing)
 		// When vertical flipped, draw sprites from the top down, at least as far as offsets are concerned.
 		// sprite height - sprite topoffset is the proper inverse of the vertical offset, of course.
 		// remember gz and gzt should be seperated by sprite height, not thing height - thing height can be shorter than the sprite itself sometimes!
-		gz = thing->z + thing->height - FixedMul(spritecachedinfo[lump].topoffset, this_scale);
+		gz = thingzpos + thing->height - FixedMul(spritecachedinfo[lump].topoffset, this_scale);
 		gzt = gz + FixedMul(spritecachedinfo[lump].height, this_scale);
 	}
 	else
 	{
-		gzt = thing->z + FixedMul(spritecachedinfo[lump].topoffset, this_scale);
+		gzt = thingzpos + FixedMul(spritecachedinfo[lump].topoffset, this_scale);
 		gz = gzt - FixedMul(spritecachedinfo[lump].height, this_scale);
 	}
 
@@ -1732,7 +1736,7 @@ static void R_ProjectSprite(mobj_t *thing)
 		light = thing->subsector->sector->numlights - 1;
 
 		for (lightnum = 1; lightnum < thing->subsector->sector->numlights; lightnum++) {
-			fixed_t h = thing->subsector->sector->lightlist[lightnum].slope ? P_GetZAt(thing->subsector->sector->lightlist[lightnum].slope, thing->x, thing->y)
+			fixed_t h = thing->subsector->sector->lightlist[lightnum].slope ? P_GetZAt(thing->subsector->sector->lightlist[lightnum].slope, thingxpos, thingypos)
 			            : thing->subsector->sector->lightlist[lightnum].height;
 			if (h <= gzt) {
 				light = lightnum - 1;
@@ -1761,12 +1765,12 @@ static void R_ProjectSprite(mobj_t *thing)
 	if (heightsec != -1 && phs != -1) // only clip things which are in special sectors
 	{
 		if (viewz < sectors[phs].floorheight ?
-		thing->z >= sectors[heightsec].floorheight :
+		thingzpos >= sectors[heightsec].floorheight :
 		gzt < sectors[heightsec].floorheight)
 			return;
 		if (viewz > sectors[phs].ceilingheight ?
 		gzt < sectors[heightsec].ceilingheight && viewz >= sectors[heightsec].ceilingheight :
-		thing->z >= sectors[heightsec].ceilingheight)
+		thingzpos >= sectors[heightsec].ceilingheight)
 			return;
 	}
 
@@ -1777,12 +1781,12 @@ static void R_ProjectSprite(mobj_t *thing)
 	vis->scale = yscale; //<<detailshift;
 	vis->sortscale = sortscale;
 	vis->dispoffset = thing->info->dispoffset; // Monster Iestyn: 23/11/15
-	vis->gx = thing->x;
-	vis->gy = thing->y;
+	vis->gx = thingxpos;
+	vis->gy = thingypos;
 	vis->gz = gz;
 	vis->gzt = gzt;
 	vis->thingheight = thing->height;
-	vis->pz = thing->z;
+	vis->pz = thingzpos;
 	vis->pzt = vis->pz + vis->thingheight;
 	vis->texturemid = vis->gzt - viewz;
 	vis->scalestep = scalestep;