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(svn r2758) Add the AB() macro to add a value to a bit range and use it in a few places, also make use of GB and SB nearby

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tron 2005-07-30 09:29:20 +00:00
parent 79620db9be
commit 9b676d2cd9
3 changed files with 9 additions and 16 deletions
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4
macros.h
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@ -146,8 +146,10 @@ static inline void swap_tile(TileIndex *a, TileIndex *b) { TileIndex t = *a; *a
/// Fetch n bits starting at bit s from x
#define GB(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
/// Set n bits in x starting at bit s to d
/// Set n bits starting at bit s in x to d
#define SB(x, s, n, d) ((x) = ((x) & ~(((1 << (n)) - 1) << (s))) | ((d) << (s)))
/// Add i to the n bits starting at bit s in x
#define AB(x, s, n, i) ((x) = ((x) & ~(((1 << (n)) - 1) << (s))) | (((x) + ((i) << (s))) & (((1 << (n)) - 1) << (s))))
/**
* ROtate x Left/Right by n (must be >= 0)

14
town_cmd.c
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@ -180,7 +180,7 @@ static void AnimateTile_Town(TileIndex tile)
i = (Random()&7) - 1;
} while (i < 0 || i == 1 || i*6==old);
_m[tile].m5 = (_m[tile].m5 & ~0x3F) | i;
SB(_m[tile].m5, 0, 6, i);
}
a = _m[tile].owner&0x7F;
@ -255,18 +255,12 @@ uint32 GetWorldPopulation(void)
static void MakeSingleHouseBigger(TileIndex tile)
{
byte b;
assert(IsTileType(tile, MP_HOUSE));
b = _m[tile].m5;
if (b & 0x80)
return;
if (_m[tile].m5 & 0x80) return;
_m[tile].m5 = (b & 0xC0) | ((b+1)&7);
if ((_m[tile].m5&7) != 0)
return;
AB(_m[tile].m5, 0, 3, 1);
if (GB(_m[tile].m5, 0, 3) != 0) return;
_m[tile].m3 = _m[tile].m3 + 0x40;

7
tree_cmd.c
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@ -485,11 +485,8 @@ static void TileLoop_Trees(TileIndex tile)
TileLoopClearHelper(tile);
/* increase counter */
{
uint16 m2 = _m[tile].m2;
_m[tile].m2 = m2 = (m2 & 0xF0) | ((m2 + 1) & 0xF);
if ((m2 & 0xF) != 0) return;
}
AB(_m[tile].m2, 0, 4, 1);
if (GB(_m[tile].m2, 0, 4) != 0) return;
m5 = _m[tile].m5;
if (GB(m5, 0, 3) == 3) {