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| author | fonsinchen <fonsinchen@openttd.org> | 2014-02-09 15:00:30 +0000 |
|---|---|---|
| committer | fonsinchen <fonsinchen@openttd.org> | 2014-02-09 15:00:30 +0000 |
| commit | e4c7c8876b787b2f9d6e9db9628cafa7688b845e (patch) | |
| tree | 85ccce31b2fa807afbf4c2166936f22fefca64a0 /src/landscape.cpp | |
| parent | 77e62f0b986ebe254f1b0c431674f1da9e94e5e5 (diff) | |
| download | openttd-e4c7c8876b787b2f9d6e9db9628cafa7688b845e.tar.xz | |
(svn r26323) -Fix: update some constants related to map size.
Diffstat (limited to 'src/landscape.cpp')
| -rw-r--r-- | src/landscape.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/landscape.cpp b/src/landscape.cpp index 4dda8fc11..a19c98db9 100644 --- a/src/landscape.cpp +++ b/src/landscape.cpp @@ -721,12 +721,13 @@ void RunTileLoop() * shift register (LFSR). This allows a deterministic pseudorandom ordering, but * still with minimal state and fast iteration. */ - /* Maximal length LFSR feedback terms, from 12-bit (for 64x64 maps) to 22-bit (for 2048x2048 maps). + /* Maximal length LFSR feedback terms, from 12-bit (for 64x64 maps) to 24-bit (for 4096x4096 maps). * Extracted from http://www.ece.cmu.edu/~koopman/lfsr/ */ static const uint32 feedbacks[] = { - 0xD8F, 0x1296, 0x2496, 0x4357, 0x8679, 0x1030E, 0x206CD, 0x403FE, 0x807B8, 0x1004B2, 0x2006A8 + 0xD8F, 0x1296, 0x2496, 0x4357, 0x8679, 0x1030E, 0x206CD, 0x403FE, 0x807B8, 0x1004B2, 0x2006A8, 0x4004B2, 0x800B87 }; - const uint32 feedback = feedbacks[MapLogX() + MapLogY() - 12]; + assert_compile(lengthof(feedbacks) == 2 * MAX_MAP_SIZE_BITS - 2 * MIN_MAP_SIZE_BITS + 1); + const uint32 feedback = feedbacks[MapLogX() + MapLogY() - 2 * MIN_MAP_SIZE_BITS]; /* We update every tile every 256 ticks, so divide the map size by 2^8 = 256 */ uint count = 1 << (MapLogX() + MapLogY() - 8); |