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fixed grid position calculation

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svn-id: r8529
This commit is contained in:
Robert Göffringmann 2003-06-17 12:27:03 +00:00
parent 61491fb295
commit 81b7b265b9
1 changed files with 4 additions and 5 deletions
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9
sky/grid.cpp
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@ -180,10 +180,9 @@ bool SkyGrid::getGridValues(uint32 x, uint32 y, uint32 width, Compact *cpt, uint
bitPos += x_signed;
int32 screenGridOfs = _gridConvertTable[cpt->screen] * GRID_SIZE;
bitPos += (screenGridOfs << 3); // convert to bits
int32 tmpBits = bitPos&0x1F;
uint32 tmpBits = 0x1F - (bitPos&0x1F);
bitPos &= ~0x1F; // divide into dword address and bit number
tmpBits = ~(tmpBits-0x1F); // NOTE THE ~ !!
bitPos += tmpBits; // anyone have an idea what this calculation is meant for?!
bitPos += tmpBits;
*resBitNum = bitPos;
*resWidth = width;
return true;
@ -200,9 +199,9 @@ void SkyGrid::removeObjectFromWalk(uint32 bitNum, uint32 width) {
for (uint32 cnt = 0; cnt < width; cnt++) {
_gameGrids[bitNum >> 3] &= ~(1 << (bitNum & 0x7));
bitNum--;
if ((bitNum & 0x1F) == 0)
bitNum += 0x3F;
else bitNum--;
}
}
@ -217,9 +216,9 @@ void SkyGrid::objectToWalk(uint32 bitNum, uint32 width) {
for (uint32 cnt = 0; cnt < width; cnt++) {
_gameGrids[bitNum >> 3] |= (1 << (bitNum & 0x7));
bitNum--;
if ((bitNum & 0x1F) == 0)
bitNum += 0x3F;
else bitNum--;
}
}