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normal/heightmap tool: allow setting the bias relatively to the median

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This commit is contained in:
Rudolf Polzer 2011-08-30 08:58:20 +02:00
parent d08c026aec
commit 2122dc0d3e
1 changed files with 49 additions and 2 deletions
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51
misc/tools/fft-normalmap-to-heightmap.c
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@ -35,7 +35,18 @@
#define TWO_PI (4*atan2(1,1) * 2)
void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h, double scale, double offset, const double *filter, int filterw, int filterh, int renormalize, double highpass)
int floatcmp(const void *a_, const void *b_)
{
float a = *(float *)a_;
float b = *(float *)b_;
if(a < b)
return -1;
if(a > b)
return +1;
return 0;
}
void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h, double scale, double offset, const double *filter, int filterw, int filterh, int renormalize, double highpass, int use_median)
{
int x, y;
int i, j;
@ -294,6 +305,38 @@ void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h,
scale = 2 / (vmax - vmin);
offset = -(vmax + vmin) / (vmax - vmin);
}
else if(use_median)
{
// negative scale = match median to offset
fprintf(stderr, "Calculating median...\n");
float *medianbuf = malloc(sizeof(float) * w * h);
float vmed;
fprintf(stderr, " converting...\n");
/* renormalize, find min/max */
for(y = 0; y < h; ++y)
for(x = 0; x < w; ++x)
{
#ifdef C99
v = creal(imgspace1[(w*y+x)]);
#else
v = (imgspace1[(w*y+x)][0]);
#endif
medianbuf[w*y+x] = v;
}
fprintf(stderr, " sorting...\n");
qsort(medianbuf, w*h, sizeof(*medianbuf), floatcmp);
fprintf(stderr, " done.\n");
if(w*h % 2)
vmed = medianbuf[(w*h-1)/2];
else
vmed = (medianbuf[(w*h)/2] + medianbuf[(w*h-2)/2]) * 0.5;
// we actually want (v - vmed) * scale + offset
offset -= vmed * scale;
}
printf("Min: %f\nAvg: %f\nMax: %f\nScale: %f\nOffset: %f\nScaled-Min: %f\nScaled-Avg: %f\nScaled-Max: %f\n",
vmin, 0.0, vmax, scale, offset, vmin * scale + offset, offset, vmax * scale + offset);
@ -1049,6 +1092,7 @@ int main(int argc, char **argv)
const char *infile, *outfile, *reffile;
double scale, offset;
int nmaplen, w, h;
int use_median = 0;
int renormalize = 0;
double highpass = 0;
unsigned char *nmapdata, *nmap, *refmap;
@ -1094,10 +1138,13 @@ int main(int argc, char **argv)
else
reffile = NULL;
// experimental features
if(getenv("FFT_NORMALMAP_TO_HEIGHTMAP_RENORMALIZE"))
renormalize = atoi(getenv("FFT_NORMALMAP_TO_HEIGHTMAP_RENORMALIZE"));
if(getenv("FFT_NORMALMAP_TO_HEIGHTMAP_HIGHPASS"))
highpass = atof(getenv("FFT_NORMALMAP_TO_HEIGHTMAP_HIGHPASS"));
if(getenv("FFT_NORMALMAP_TO_HEIGHTMAP_USE_MEDIAN"))
use_median = atof(getenv("FFT_NORMALMAP_TO_HEIGHTMAP_USE_MEDIAN"));
nmapdata = FS_LoadFile(infile, &nmaplen);
if(!nmapdata)
@ -1160,7 +1207,7 @@ int main(int argc, char **argv)
hmap_to_nmap(nmap, image_width, image_height, -scale-1, offset);
}
else
nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset, filter, filterw, filterh, renormalize, highpass);
nmap_to_hmap(nmap, refmap, image_width, image_height, scale, offset, filter, filterw, filterh, renormalize, highpass, use_median);
if(!Image_WriteTGABGRA(outfile, image_width, image_height, nmap))
{