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}
// Compact ids.
unsigned char remap[256];
memset(remap, 0, 256);
// Find number of unique regions.
regId = 0;
for (int i = 0; i < nregs; ++i)
remap[regs[i].regId] = 1;
for (int i = 0; i < 256; ++i)
if (remap[i])
remap[i] = regId++;
// Remap ids.
for (int i = 0; i < nregs; ++i)
regs[i].regId = remap[regs[i].regId];
layer.regCount = regId;
for (int i = 0; i < w*h; ++i)
{
if (layer.regs[i] != 0xff)
layer.regs[i] = regs[layer.regs[i]].regId;
}
return DT_SUCCESS;
}
static bool appendVertex(dtTempContour& cont, const int x, const int y, const int z, const int r)
{
// Try to merge with existing segments.
if (cont.nverts > 1)
{
unsigned char* pa = &cont.verts[(cont.nverts-2)*4];
unsigned char* pb = &cont.verts[(cont.nverts-1)*4];
if ((int)pb[3] == r)
{
if (pa[0] == pb[0] && (int)pb[0] == x)
{
// The verts are aligned aling x-axis, update z.
pb[1] = (unsigned char)y;
pb[2] = (unsigned char)z;
return true;
}
else if (pa[2] == pb[2] && (int)pb[2] == z)
{
// The verts are aligned aling z-axis, update x.
pb[0] = (unsigned char)x;
pb[1] = (unsigned char)y;
return true;
}
}
}
// Add new point.
if (cont.nverts+1 > cont.cverts)
return false;
unsigned char* v = &cont.verts[cont.nverts*4];
v[0] = (unsigned char)x;
v[1] = (unsigned char)y;
v[2] = (unsigned char)z;
v[3] = (unsigned char)r;
cont.nverts++;
return true;
}
static unsigned char getNeighbourReg(dtTileCacheLayer& layer,
const int ax, const int ay, const int dir)
{
const int w = (int)layer.header->width;
const int ia = ax + ay*w;
const unsigned char con = layer.cons[ia] & 0xf;
const unsigned char portal = layer.cons[ia] >> 4;
const unsigned char mask = (unsigned char)(1<<dir);
if ((con & mask) == 0)
{
// No connection, return portal or hard edge.
if (portal & mask)
return 0xf8 + (unsigned char)dir;
return 0xff;
}
const int bx = ax + getDirOffsetX(dir);
const int by = ay + getDirOffsetY(dir);
const int ib = bx + by*w;
return layer.regs[ib];
}
static bool walkContour(dtTileCacheLayer& layer, int x, int y, dtTempContour& cont)
{
const int w = (int)layer.header->width;
const int h = (int)layer.header->height;