// import a buffer of greyscale values as a heightfield
//
Bool HeightField::ImportBitmap( char * buffer, U32 bwid, U32 bhgt, F32 scale, Area<S32> & rect)
{
U32 wid = rect.Width();
U32 hgt = rect.Height();
F32 dbx = (F32) bwid / (F32) wid;
F32 dbz = (F32) bhgt / (F32) hgt;
F32 bz = 0.0f;
S32 cx, cz, offset = rect.p0.y * cellPitch + rect.p0.x;
for (cz = rect.p0.y; cz < rect.p1.y; cz++, bz += dbz)
{
F32 boff = bz * (F32) bwid;
for (cx = rect.p0.x; cx < rect.p1.x; cx++, offset++, boff += dbx)
{
F32 h = ((U8) buffer[ (U32) boff]) * scale;
cellList[offset].height = h;
}
}
return TRUE;
}
// perform a heightfield to heightfield paste operation
//
void HeightField::Paste( Area<S32> & dstRect, HeightField & buf, Area<S32> & bufRect, F32 scale, U32 flags, F32 atHeight)
{
ASSERT( cellList && buf.cellList);
// in cells
U32 wid = dstRect.Width();
U32 hgt = dstRect.Height();
// in meters
F32 sdx = (F32) bufRect.Width() * buf.meterPerCell / (F32) wid;
F32 sdz = (F32) bufRect.Height() * buf.meterPerCell / (F32) hgt;
F32 sz = (F32) bufRect.p0.y * buf.meterPerCell;
S32 z, x; // cells
for (z = dstRect.p0.y; z < dstRect.p1.y; z++, sz += sdz)
{
F32 sx = (F32) bufRect.p0.x * buf.meterPerCell;
x = dstRect.p0.x;
U32 offset = z * cellPitch + x;
for ( ; x < dstRect.p1.x; x++, sx += sdx, offset++)
{
if (x < 0 || x > (S32) cellWidth || z < 0 || z > (S32) cellHeight)
{
continue;
}
Cell &cell = cellList[ offset];
if (flags & HeightField::EDITSMOOTH)
{
if (x < 1 || x >= (S32) cellWidth -1 || z < 1 || z >= (S32) cellHeight -1)
{
continue;
}
Cell &c0 = cellList[offset - 1];
Cell &c1 = cellList[offset + 1];
Cell &c2 = cellList[offset - cellPitch];
Cell &c3 = cellList[offset + cellPitch];
// move towards the average of surrounding cells' heights
F32 h = (c0.height + c1.height + c2.height + c3.height) * 0.25f - cell.height;
// by a miniture factor of the brushscale (unfactored smoothing is too aggressive)
h *= scale * 0.3f;
cell.height += h;
}
#if 1
else if (flags & HeightField::EDITHEIGHTS)
{
if (flags & HeightField::EDITADD)
{
cell.height += buf.FindFloor( sx, sz) * scale;
}
else
{
cell.height = atHeight + (buf.FindFloor( sx, sz) - 1.0f) * scale;
}
}
#else
else if (flags & HeightField::EDITHEIGHTS)
{
if (flags & HeightField::EDITADD)
{
// add heights to the current height
atHeight = cell.height;
}
F32 y = atHeight + buf.FindFloor( sx, sz) * scale;
//if (y < 0.0f)
//{
// clamp terrain to 0 meters or above
// y = 0.0f;
//}
cell.height = y;
}
#endif
}
}
}