normal2heightmap: more fixes

[xonotic/xonotic.git] / misc / tools / fft-normalmap-to-heightmap.c

diff --git a/misc/tools/fft-normalmap-to-heightmap.c b/misc/tools/fft-normalmap-to-heightmap.c
index 95782ec83cf1ea8d6175d47496800eb1e7fcafb3..0c06f3dc74e06da915937bd95ef9054edd13ed2b 100644 (file)
--- a/misc/tools/fft-normalmap-to-heightmap.c
+++ b/misc/tools/fft-normalmap-to-heightmap.c
@@ -94,7 +94,7 @@ void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h,
                        fy -= h;
 #ifdef C99
                if(fx||fy)
-                       freqspace1[(w*y+x)] = I * (fx * freqspace1[(w*y+x)] + fy * freqspace2[(w*y+x)]) / (fx*fx + fy*fy) / TWO_PI;
+                       freqspace1[(w*y+x)] = _Complex_I * (fx * freqspace1[(w*y+x)] + fy * freqspace2[(w*y+x)]) / (fx*fx + fy*fy) / TWO_PI;
                else
                        freqspace1[(w*y+x)] = 0;
 #else
@@ -114,24 +114,20 @@ void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h,
 
        fftw_execute(f12i1);
 
-       if(refmap)
+       /* renormalize */
+       for(y = 0; y < h; ++y)
+       for(x = 0; x < w; ++x)
        {
-               // refmap: a reference map to define the heights
-               // alpha = weight, color = value
-               // if more than one color value is used, colors are also matched
-
-               // we do linear regression, basically
-               // f'(x, y) = f(x, y) * scale + offset
-               // sum((f(x, y) * scale + offset - ref_y(x, y))^2 * ref_a(x, y)) minimize
-
-               // diff by offset:
-               // sum(-2*ref_y(x,y)*ref_a(x,y) + 2*scale*f(x,y)*ref_a(x,y) + 2*offset*ref_a(x,y)) = 0
-               // diff by scale:
-               // sum(-2*f(x,y)*ref_a(x,y) + 2*scale*f(x,y)^2*ref_a(x,y) + 2*offset*f(x,y)*ref_a(x,y)) = 0
-               // ->
-               // offset = (sfa*sfya - sffa*sya) / (sfa*sfa-sa*sffa)
-               // scale  = (sfa*sya - sa*sfya) / (sfa*sfa-sa*sffa)
+#ifdef C99
+               imgspace1[(w*y+x)] /= (w*h);
+#else
+               imgspace1[(w*y+x)][0] /= (w*h);
+               imgspace1[(w*y+x)][1] /= (w*h);
+#endif
+       }
 
+       if(refmap)
+       {
                double f, a;
                double o, s;
                double sa, sfa, sffa, sfva, sva;
@@ -142,9 +138,9 @@ void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h,
                for(y = 0; y < h; ++y)
                for(x = 0; x < w; ++x)
                {
-                       a = (int)refmap[(w*y+x)*4+0];
-                       v = (map[(w*y+x)*4+0]*0.114 + map[(w*y+x)*4+1]*0.587 + map[(w*y+x)*4+2]*0.299);
-                       v = (v - 128.0) / 127.0; // value 0 is forbidden, 1 -> -1, 255 -> 1
+                       a = (int)refmap[(w*y+x)*4+3];
+                       v = (refmap[(w*y+x)*4+0]*0.114 + refmap[(w*y+x)*4+1]*0.587 + refmap[(w*y+x)*4+2]*0.299);
+                       v = (v - 128.0) / 127.0;
 #ifdef C99
                        f = creal(imgspace1[(w*y+x)]);
 #else
@@ -152,33 +148,35 @@ void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h,
 #endif
                        if(a <= 0)
                                continue;
-                       if(y < mi)
-                               mi = y;
-                       if(y > ma)
-                               ma = y;
+                       if(v < mi)
+                               mi = v;
+                       if(v > ma)
+                               ma = v;
                        sa += a;
                        sfa += f*a;
                        sffa += f*f*a;
                        sfva += f*v*a;
                        sva += v*a;
                }
-               sfa /= (w*h);
-               sffa /= (w*h);
-               sffa /= (w*h);
-               sfva /= (w*h);
                if(mi < ma)
                {
+                       /* linear regression ftw */
                        o = (sfa*sfva - sffa*sva) / (sfa*sfa-sa*sffa);
                        s = (sfa*sva - sa*sfva) / (sfa*sfa-sa*sffa);
                }
-               else // all values of v are equal, so we cannot get scale; we can still get offset
+               else /* all values of v are equal, so we cannot get scale; we can still get offset */
                {
                        o = ((sva - sfa) / sa);
                        s = 1;
                }
-               // now apply user-given offset and scale to these values
-               // (x * s + o) * scale + offset
-               // x * s * scale + o * scale + offset
+
+               printf("Ref-computed scale: %f\nRef-computed offset: %f\n", s, o);
+
+               /*
+                * now apply user-given offset and scale to these values
+                * (x * s + o) * scale + offset
+                * x * s * scale + o * scale + offset
+                */
                offset += o * scale;
                scale *= s;
        }
@@ -203,9 +201,6 @@ void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h,
                                vmax = v;
                }
 
-               vmin /= (w*h);
-               vmax /= (w*h);
-
                /*
                 * map vmin to -1
                 * map vmax to +1
@@ -216,8 +211,6 @@ void nmap_to_hmap(unsigned char *map, const unsigned char *refmap, int w, int h,
                printf("Autocomputed scale: %f\nAutocomputed offset: %f\n", scale, offset);
        }
 
-       scale /= (w*h);
-
        for(y = 0; y < h; ++y)
        for(x = 0; x < w; ++x)
        {
@@ -307,8 +300,8 @@ void hmap_to_nmap(unsigned char *map, int w, int h, int src_chan, double scale)
                freqspace1[(w*y+x)] *= 1 - pow(abs(fx) / (double)(w/2), 1);
                freqspace1[(w*y+x)] *= 1 - pow(abs(fy) / (double)(h/2), 1);
 
-               freqspace2[(w*y+x)] = TWO_PI*I * fy * freqspace1[(w*y+x)]; /* y derivative */
-               freqspace1[(w*y+x)] = TWO_PI*I * fx * freqspace1[(w*y+x)]; /* x derivative */
+               freqspace2[(w*y+x)] = TWO_PI*_Complex_I * fy * freqspace1[(w*y+x)]; /* y derivative */
+               freqspace1[(w*y+x)] = TWO_PI*_Complex_I * fx * freqspace1[(w*y+x)]; /* x derivative */
 #else
                /* a lowpass to prevent the worst */
                freqspace1[(w*y+x)][0] *= 1 - pow(abs(fx) / (double)(w/2), 1);
@@ -974,7 +967,7 @@ int main(int argc, char **argv)
 
        if(reffile)
        {
-               nmapdata = FS_LoadFile(infile, &nmaplen);
+               nmapdata = FS_LoadFile(reffile, &nmaplen);
                if(!nmapdata)
                {
                        printf("FS_LoadFile failed\n");
@@ -993,6 +986,8 @@ int main(int argc, char **argv)
                        return 2;
                }
        }
+       else
+               refmap = NULL;
 
        if(scale < -6)
                hmap_to_nmap(nmap, image_width, image_height, -scale-7, offset);