gronod/OpenTTD
1
0
Fork 0
mirror of https://github.com/OpenTTD/OpenTTD.git synced 2025-03-12 10:30:28 +00:00
Code Issues Packages Projects Releases Wiki Activity

Codechange: Document the _ship_subcoord table

Browse Source
This commit is contained in:
Niels Martin Hansen 2022-05-06 12:50:30 +02:00
parent c6e4fa7df1
commit 588fee5473
1 changed files with 44 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
src/ship_cmd.cpp
View File

@ -516,38 +516,53 @@ static inline TrackBits GetAvailShipTracks(TileIndex tile, DiagDirection dir)
return tracks;
}
static const byte _ship_subcoord[4][6][3] = {
/** Structure for ship sub-coordinate data for moving into a new tile via a Diagdir onto a Track. */
struct ShipSubcoordData {
byte x_subcoord; ///< New X sub-coordinate on the new tile
byte y_subcoord; ///< New Y sub-coordinate on the new tile
Direction dir; ///< New Direction to move in on the new track
};
/** Ship sub-coordinate data for moving into a new tile via a Diagdir onto a Track.
* Array indexes are Diagdir, Track.
* There will always be three possible tracks going into an adjacent tile via a Diagdir,
* so each Diagdir sub-array will have three valid and three invalid structures per Track.
*/
static const ShipSubcoordData _ship_subcoord[DIAGDIR_END][TRACK_END] = {
// DIAGDIR_NE
{
{15, 8, 1},
{ 0, 0, 0},
{ 0, 0, 0},
{15, 8, 2},
{15, 7, 0},
{ 0, 0, 0},
{15, 8, DIR_NE}, // TRACK_X
{ 0, 0, INVALID_DIR}, // TRACK_Y
{ 0, 0, INVALID_DIR}, // TRACK_UPPER
{15, 8, DIR_E}, // TRACK_LOWER
{15, 7, DIR_N}, // TRACK_LEFT
{ 0, 0, INVALID_DIR}, // TRACK_RIGHT
},
// DIAGDIR_SE
{
{ 0, 0, 0},
{ 8, 0, 3},
{ 7, 0, 2},
{ 0, 0, 0},
{ 8, 0, 4},
{ 0, 0, 0},
{ 0, 0, INVALID_DIR}, // TRACK_X
{ 8, 0, DIR_SE}, // TRACK_Y
{ 7, 0, DIR_E}, // TRACK_UPPER
{ 0, 0, INVALID_DIR}, // TRACK_LOWER
{ 8, 0, DIR_S}, // TRACK_LEFT
{ 0, 0, INVALID_DIR}, // TRACK_RIGHT
},
// DIAGDIR_SW
{
{ 0, 8, 5},
{ 0, 0, 0},
{ 0, 7, 6},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 8, 4},
{ 0, 8, DIR_SW}, // TRACK_X
{ 0, 0, INVALID_DIR}, // TRACK_Y
{ 0, 7, DIR_W}, // TRACK_UPPER
{ 0, 0, INVALID_DIR}, // TRACK_LOWER
{ 0, 0, INVALID_DIR}, // TRACK_LEFT
{ 0, 8, DIR_S}, // TRACK_RIGHT
},
// DIAGDIR_NW
{
{ 0, 0, 0},
{ 8, 15, 7},
{ 0, 0, 0},
{ 8, 15, 6},
{ 0, 0, 0},
{ 7, 15, 0},
{ 0, 0, INVALID_DIR}, // TRACK_X
{ 8, 15, DIR_NW}, // TRACK_Y
{ 0, 0, INVALID_DIR}, // TRACK_UPPER
{ 8, 15, DIR_W}, // TRACK_LOWER
{ 0, 0, INVALID_DIR}, // TRACK_LEFT
{ 7, 15, DIR_N}, // TRACK_RIGHT
}
};
@ -627,7 +642,6 @@ bool IsShipDestinationTile(TileIndex tile, StationID station)
static void ShipController(Ship *v)
{
uint32 r;
const byte *b;
Track track;
TrackBits tracks;
GetNewVehiclePosResult gp;
@ -744,10 +758,10 @@ static void ShipController(Ship *v)
track = ChooseShipTrack(v, gp.new_tile, diagdir, tracks);
if (track == INVALID_TRACK) goto reverse_direction;
b = _ship_subcoord[diagdir][track];
const ShipSubcoordData &b = _ship_subcoord[diagdir][track];
gp.x = (gp.x & ~0xF) | b[0];
gp.y = (gp.y & ~0xF) | b[1];
gp.x = (gp.x & ~0xF) | b.x_subcoord;
gp.y = (gp.y & ~0xF) | b.y_subcoord;
/* Call the landscape function and tell it that the vehicle entered the tile */
r = VehicleEnterTile(v, gp.new_tile, gp.x, gp.y);
@ -763,7 +777,7 @@ static void ShipController(Ship *v)
if (old_wc != new_wc) v->UpdateCache();
}
Direction new_direction = (Direction)b[2];
Direction new_direction = b.dir;
DirDiff diff = DirDifference(new_direction, v->direction);
switch (diff) {
case DIRDIFF_SAME: