# HG changeset patch
# User celestar
# Date 1167498570 0
# Node ID a8e391b7b10ab7692e21aa3e4d6dc590adef61f5
# Parent  3864438e7cb2cdd8f20a65df0019982a136c5962
(svn r7651) [cbh] - Fix: Allow trains to enter bridge head tiles from "the side"

diff -r 3864438e7cb2 -r a8e391b7b10a bridge_cmd.c
--- a/bridge_cmd.c	Sat Dec 30 17:08:50 2006 +0000
+++ b/bridge_cmd.c	Sat Dec 30 17:09:30 2006 +0000
@@ -766,6 +766,17 @@
 	return bridge_speed;
 }
 
+static bool IsCustomBridgeHead(TileIndex tile)
+{
+	assert(IsBridgeTile(tile));
+
+	if (IsTileType(tile, MP_RAILWAY_BRIDGE)) {
+		return !(GetTrackBits(tile) == TRACK_BIT_X || GetTrackBits(tile) == TRACK_BIT_Y);
+	}
+
+	return false; /* TODO - street bridges */
+}
+
 
 /** Gets the absolute z coordinate of a point inside a bridge tile
  *  When we're on the track (that means between position 5 and 10)
@@ -773,6 +784,8 @@
  *  height of the ramp
  *  Outside this range (from 0 to 4 and from 11 to 15) it returns the
  *  "true" Z coordinate of the tile by taking the slope into account
+ *  For custom bridge heads the entire bridge head is flat and has the
+ *  same z coordinate
  *  @param tile The index of the tile we are talking about
  *  @param x Absolute or relative x coordinate
  *  @param y Absolute or relative y coordinate
@@ -789,8 +802,8 @@
 
 	pos = (DiagDirToAxis(dir) == AXIS_X ? y : x);
 
-	// On the bridge ramp?
-	if (5 <= pos && pos <= 10) {
+	// On the bridge ramp or flat bridge head?
+	if ( (5 <= pos && pos <= 10) || IsCustomBridgeHead(tile)) {
 		uint delta;
 
 		if (IsSteepSlope(tileh)) return z + TILE_HEIGHT * 2;
@@ -937,6 +950,13 @@
 
 	DiagDirection dir;
 
+	if (IsCustomBridgeHead(tile)) {
+		uint h;
+		GetTileSlope(tile, &h);
+
+		z = h + TILE_HEIGHT - v->z_pos;
+	}
+
 	if (myabs(z) > 2) return 8;
 
 	if (v->type == VEH_Road || (v->type == VEH_Train && IsFrontEngine(v))) {
@@ -948,7 +968,7 @@
 	}
 
 	dir = GetBridgeRampDirection(tile);
-	if (DirToDiagDir(v->direction) == dir) {
+	if (DirToDiagDir(v->direction) == dir || IsTileType(tile, MP_RAILWAY_BRIDGE)) {
 		switch (dir) {
 			default: NOT_REACHED();
 			case DIAGDIR_NE: if ((x & 0xF) != 0)             return 0; break;