(svn r4546) - NewGRF: add support for Action 0x05, type 0x04: replacement signal graphics. Thanks to Purno for supplying data to test

with.

newgrf.c

@@ -38,6 +38,7 @@ uint16 _custom_sprites_base;
 static int _skip_sprites; // XXX
 static uint _file_index; // XXX
 extern int _traininfo_vehicle_pitch;
+SpriteID _signal_base = 0;
 
 static GRFFile *_cur_grffile;
 GRFFile *_first_grffile;
@@ -1823,8 +1824,27 @@ static void GraphicsNew(byte *buf, int len)
 	type = grf_load_byte(&buf);
 	num  = grf_load_extended(&buf);
 
-	grfmsg(GMS_NOTICE, "GraphicsNew: Custom graphics (type 0x%02X) sprite block of length %d (unimplemented, ignoring).\n",
-	       type, num);
+	switch (type) {
+		case 0x04: /* Signal graphics */
+			if (num != 112 && num != 240) {
+				grfmsg(GMS_WARN, "GraphicsNews: Signal graphics sprite count must be 112 or 240, skipping.");
+				return;
+			}
+			_signal_base = _cur_spriteid;
+			break;
+
+		default:
+			grfmsg(GMS_NOTICE, "GraphicsNew: Custom graphics (type 0x%02X) sprite block of length %u (unimplemented, ignoring).\n",
+					type, num);
+			return;
+	}
+
+	grfmsg(GMS_NOTICE, "GraphicsNew: Loading %u sprites of type 0x%02X at SpriteID 0x%04X", num, type, _cur_spriteid);
+
+	for (; num > 0; num--) {
+		LoadNextSprite(_cur_spriteid++, _file_index);
+		_nfo_line++;
+	}
 }
 
 /* Action 0x06 */

newgrf.h

@@ -60,6 +60,7 @@ typedef struct GRFConfig {
 } GRFConfig;
 
 extern GRFConfig *_first_grfconfig;
+extern SpriteID _signal_base;
 
 void LoadNewGRF(uint load_index, uint file_index);
 

rail_cmd.c

@@ -26,6 +26,7 @@
 #include "waypoint.h"
 #include "rail.h"
 #include "railtypes.h" // include table for railtypes
+#include "newgrf.h"
 
 extern uint16 _custom_sprites_base;
 
@@ -1047,7 +1048,16 @@ static void DrawSingleSignal(TileIndex tile, byte condition, uint image, uint po
 	uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
 	uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
 
-	SpriteID sprite = SignalBase[side][GetSignalVariant(tile)][GetSignalType(tile)] + image + condition;
+	SpriteID sprite;
+
+	/* _signal_base is set by our NewGRF Action 5 loader. If it is 0 then we
+	 * just draw the standard signals, else we get the offset from _signal_base
+	 * and draw that sprite. All the signal sprites are loaded sequentially. */
+	if (_signal_base == 0 || (GetSignalType(tile) == 0 && GetSignalVariant(tile) == SIG_ELECTRIC)) {
+		sprite = SignalBase[side][GetSignalVariant(tile)][GetSignalType(tile)] + image + condition;
+	} else {
+		sprite = _signal_base + (GetSignalType(tile) - 1) * 16 + GetSignalVariant(tile) * 64 + image + condition;
+	}
 
 	AddSortableSpriteToDraw(sprite, x, y, 1, 1, 10, GetSlopeZ(x,y));
 }