1 files changed, 133 insertions, 0 deletions
diff --git a/src/trafficlight.h b/src/trafficlight.h
new file mode 100644
index 000000000..4563a690c
--- /dev/null
+++ b/src/trafficlight.h
@@ -0,0 +1,133 @@
+/* $Id: trafficlight.h $ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file trafficlight.h variables used for handling trafficlights. */
+
+
+/**
+ * Used for synchronising traffic light signals.
+ * Number below is how far we look into the _tl_check_offsets array when
+ * placing trafficlights, based on _settings_game.construction.max_tlc_distance.
+ */
+static const uint8 _tlc_distance[5] = {
+0,  ///< no synchronizing.
+8,  ///< adjecant tiles only.
+24, ///< 2 tiles away.
+48, ///< 3 tiles away.
+80  ///< 4 tiles away.
+};
+
+/** TileDiffs for the adjacent tiles and those a little further away. */
+static const TileIndexDiffC _tl_check_offsets[80] = {
+	/* Tiles next to this tile (8 tiles). */
+	{-1, -1},
+	{ 0, -1},
+	{ 1, -1},
+	{ 1,  0},
+	{ 1,  1},
+	{ 0,  1},
+	{-1,  1},
+	{-1,  0},
+	/* Tiles two tiles away from this tile (16 tiles). */
+	{-2, -2},
+	{-1, -2},
+	{ 0, -2},
+	{ 1, -2},
+	{ 2, -2},
+	{ 2, -1},
+	{ 2,  0},
+	{ 2,  1},
+	{ 2,  2},
+	{ 1,  2},
+	{ 0,  2},
+	{-1,  2},
+	{-2,  2},
+	{-2,  1},
+	{-2,  0},
+	{-2, -1},
+	/* Tiles three tiles away from this tile (24 tiles). */
+	{-3, -3},
+	{-3, -2},
+	{-3, -1},
+	{-3,  0},
+	{-3,  1},
+	{-3,  2},
+	{-3,  3},
+	{-2,  3},
+	{-1,  3},
+	{ 0,  3},
+	{ 1,  3},
+	{ 2,  3},
+	{ 3,  3},
+	{ 3,  2},
+	{ 3,  1},
+	{ 3,  0},
+	{ 3, -1},
+	{ 3, -2},
+	{ 3, -3},
+	{ 2, -3},
+	{ 1, -3},
+	{ 0, -3},
+	{-1, -3},
+	{-2, -3},
+	/* Tiles four tiles away from this tile (32 tiles). */
+	{-4, -4},
+	{-3, -4},
+	{-2, -4},
+	{-1, -4},
+	{ 0, -4},
+	{ 1, -4},
+	{ 2, -4},
+	{ 3, -4},
+	{ 4, -4},
+	{ 4, -3},
+	{ 4, -2},
+	{ 4, -1},
+	{ 4,  0},
+	{ 4,  1},
+	{ 4,  2},
+	{ 4,  3},
+	{ 4,  4},
+	{ 3,  4},
+	{ 2,  4},
+	{ 1,  4},
+	{ 0,  4},
+	{-1,  4},
+	{-2,  4},
+	{-3,  4},
+	{-4,  4},
+	{-4,  3},
+	{-4,  2},
+	{-4,  1},
+	{-4,  0},
+	{-4, -1},
+	{-4, -2},
+	{-4, -3}
+};
+
+/**
+ * Drawing offsets for the traffic light posts [roadside (left, right)][direction (SW, SE, NW, NE)].
+ */
+static const Point _tl_offsets[2][4] = {
+	{{15, 1}, {14, 15}, {1, 0}, {0, 14}},  // Left side driving.
+	{{15, 14}, {1, 15}, {14, 0}, {0, 1}}   // Right side driving.
+};
+
+/**
+ * Sprites needed for the various states of a TL crossing [state][direction].
+ */
+static const SpriteID _tls_to_sprites[7][4] = {
+	{SPR_TL_SW_NONE,       SPR_TL_SE_NONE,       SPR_TL_NW_NONE,       SPR_TL_NE_NONE},
+	{SPR_TL_SW_GREEN,      SPR_TL_SE_RED,        SPR_TL_NW_RED,        SPR_TL_NE_GREEN},
+	{SPR_TL_SW_YELLOW,     SPR_TL_SE_RED,        SPR_TL_NW_RED,        SPR_TL_NE_YELLOW},
+	{SPR_TL_SW_RED,        SPR_TL_SE_RED_YELLOW, SPR_TL_NW_RED_YELLOW, SPR_TL_NE_RED},
+	{SPR_TL_SW_RED,        SPR_TL_SE_GREEN,      SPR_TL_NW_GREEN,      SPR_TL_NE_RED},
+	{SPR_TL_SW_RED,        SPR_TL_SE_YELLOW,     SPR_TL_NW_YELLOW,     SPR_TL_NE_RED},
+	{SPR_TL_SW_RED_YELLOW, SPR_TL_SE_RED,        SPR_TL_NW_RED,        SPR_TL_NE_RED_YELLOW}
+};