static void UpdateFences(TileIndex tile)
{
assert(IsTileType(tile, MP_CLEAR) && IsClearGround(tile, CLEAR_FIELDS));
bool dirty = false;
bool neighbour = (IsTileType(TILE_ADDXY(tile, 1, 0), MP_CLEAR) && IsClearGround(TILE_ADDXY(tile, 1, 0), CLEAR_FIELDS));
if (!neighbour && GetFence(tile, DIAGDIR_SW) == 0) {
SetFence(tile, DIAGDIR_SW, 3);
dirty = true;
}
neighbour = (IsTileType(TILE_ADDXY(tile, 0, 1), MP_CLEAR) && IsClearGround(TILE_ADDXY(tile, 0, 1), CLEAR_FIELDS));
if (!neighbour && GetFence(tile, DIAGDIR_SE) == 0) {
SetFence(tile, DIAGDIR_SE, 3);
dirty = true;
}
neighbour = (IsTileType(TILE_ADDXY(tile, -1, 0), MP_CLEAR) && IsClearGround(TILE_ADDXY(tile, -1, 0), CLEAR_FIELDS));
if (!neighbour && GetFence(tile, DIAGDIR_NE) == 0) {
SetFence(tile, DIAGDIR_NE, 3);
dirty = true;
}
neighbour = (IsTileType(TILE_ADDXY(tile, 0, -1), MP_CLEAR) && IsClearGround(TILE_ADDXY(tile, 0, -1), CLEAR_FIELDS));
if (!neighbour && GetFence(tile, DIAGDIR_NW) == 0) {
SetFence(tile, DIAGDIR_NW, 3);
dirty = true;
}
if (dirty) MarkTileDirtyByTile(tile);
}
static Bool
MakeTiles(ScrnInfoPtr pScrn, I830MemRange *pMem)
{
I830Ptr pI830 = I830PTR(pScrn);
int pitch, ntiles, i;
static int nextTile = 0;
static int tileGeneration = -1;
#if 0
/* Hack to "improve" the alignment of the front buffer.
*/
while (!(pMem->Start & ~pMem->Alignment) && pMem->Alignment < 0x00400000 )
pMem->Alignment <<= 1;
#endif
if (tileGeneration != serverGeneration) {
tileGeneration = serverGeneration;
nextTile = 0;
}
pitch = pScrn->displayWidth * pI830->cpp;
/*
* Simply try to break the region up into at most four pieces of size
* equal to the alignment.
*/
ntiles = ROUND_TO(pMem->Size, pMem->Alignment) / pMem->Alignment;
if (ntiles >= 4) {
return FALSE;
}
for (i = 0; i < ntiles; i++, nextTile++) {
SetFence(pScrn, nextTile, pMem->Start + i * pMem->Alignment,
pitch, pMem->Alignment);
}
return TRUE;
}
