diff options
| -rw-r--r-- | fb.c | 27 |
1 files changed, 23 insertions, 4 deletions
@@ -81,16 +81,35 @@ static void rasterconvF2C(Raster *dst, Raster *src) { ulong *c, len; - float *f; + float *f, min, max; uchar b; - c = dst->data; + /* first run: get the domain */ f = (float*)src->data; len = Dx(dst->r)*Dy(dst->r); + for(min = 0, max = 0; len--; f++){ + if(isInf(*f, -1)) /* -∞ is the DNotacolor of the z-buffer */ + continue; + min = min(*f, min); + max = max(*f, max); + } + /* center it at zero: [min, max] → [0, max-min]*/ + max -= min; + if(max == 0) + max = 1; + /* second run: average the values */ + c = dst->data; + f = (float*)src->data; + len = Dx(dst->r)*Dy(dst->r); while(len--){ - b = fclamp(*f++, 0, 1)*0xFF; - *c++ = 0xFF<<24 | b<<16 | b<<8 | b; + if(isInf(*f, -1)){ /* -∞ is the DNotacolor of the z-buffer */ + *c++ = 0x00; + f++; + continue; + } + b = (*f++ - min)/max * 0xFF; + *c++ = (b * 0x00010101)<<8 | 0xFF; } } |