Merge branch 'master' into divVerent/crypto2

[xonotic/xonotic.git] / misc / tools / spherefunc2skybox.c

diff --git a/misc/tools/spherefunc2skybox.c b/misc/tools/spherefunc2skybox.c
index 3e3e7a5ad007bed931add27f01fcdee1233521d3..1f5481c3eb8269e2a1c3dab3f1d357aabad5dbb6 100644 (file)
--- a/misc/tools/spherefunc2skybox.c
+++ b/misc/tools/spherefunc2skybox.c
@@ -141,6 +141,77 @@ void color_mandelbrot(double x, double y, double z, double *r, double *g, double
        *b = pow(iterations, color_mandelbrot_parms[12]);
 }
 
+struct
+{
+       int n;
+       double darkness;
+       double power;
+       double density;
+}
+color_starfield_parms;
+void color_starfield(double x, double y, double z, double *r, double *g, double *b)
+{
+       static struct
+       {
+               double x, y, z, e;
+               double R, G, B, A;
+       } *starfield = NULL;
+       int i;
+       double f;
+
+       if(!starfield)
+       {
+               fprintf(stderr, "Initializing starfield...\n");
+               starfield = malloc(sizeof(*starfield) * color_starfield_parms.n);
+               for(i = 0; i < color_starfield_parms.n; ++i)
+               {
+                       double r;
+                       do
+                       {
+                               starfield[i].x = rnd() * 2 - 1;
+                               starfield[i].y = rnd() * 2 - 1;
+                               starfield[i].z = rnd() * 2 - 1;
+                               r = starfield[i].x * starfield[i].x
+                                 + starfield[i].y * starfield[i].y
+                                 + starfield[i].z * starfield[i].z;
+                       }
+                       while(r > 1);
+                       r = sqrt(r);
+                       starfield[i].x /= r;
+                       starfield[i].y /= r;
+                       starfield[i].z /= r;
+
+                       starfield[i].e = color_starfield_parms.density * pow(rnd(), -color_starfield_parms.power);
+
+                       starfield[i].R = rnd();
+                       starfield[i].G = rnd();
+                       starfield[i].B = rnd();
+                       f = starfield[i].R * 0.299 + starfield[i].G * 0.587 + starfield[i].B * 0.114;
+                       starfield[i].R /= f;
+                       starfield[i].G /= f;
+                       starfield[i].B /= f;
+                       starfield[i].A = rnd();
+               }
+               fprintf(stderr, "Done.\n");
+       }
+
+       *r = *g = *b = 0;
+       for(i = 0; i < color_starfield_parms.n; ++i)
+       {
+               double dot = x * starfield[i].x + y * starfield[i].y + z * starfield[i].z;
+               if(dot <= 0)
+                       continue;
+               double f = pow(dot, starfield[i].e) * starfield[i].A;
+               *r += starfield[i].R * f;
+               *g += starfield[i].G * f;
+               *b += starfield[i].B * f;
+       }
+       // make fit in 0..1
+       *r = *r / (color_starfield_parms.darkness + *r);
+       *g = *g / (color_starfield_parms.darkness + *g);
+       *b = *b / (color_starfield_parms.darkness + *b);
+}
+
 void map_back(double x_in, double y_in, double *x_out, double *y_out, double *z_out)
 {
        *x_out = 2 * x_in - 1;
@@ -187,6 +258,7 @@ void writepic(colorfunc_t f, mapfunc_t m, const char *fn, int width, int height)
 {
        int x, y;
        uint8_t tga[18];
+       int percent, p;
 
        FILE *file = fopen(fn, "wb");
        if(!file)
@@ -201,7 +273,9 @@ void writepic(colorfunc_t f, mapfunc_t m, const char *fn, int width, int height)
        tga[16] = 24;        // pixel size
 
        fwrite(&tga, sizeof(tga), 1, file);
+       percent = 0;
        for(y = height-1; y >= 0; --y)
+       {
                for(x = 0; x < width; ++x)
                {
                        uint8_t rgb[3];
@@ -222,6 +296,14 @@ void writepic(colorfunc_t f, mapfunc_t m, const char *fn, int width, int height)
                        rgb[0] = floor(rnd() + bb * 255);
                        fwrite(rgb, sizeof(rgb), 1, file);
                }
+               p = (100 * (height - y)) / height;
+               if(p != percent)
+               {
+                       percent = p;
+                       fprintf(stderr, "%d%%\r", percent);
+               }
+       }
+       fprintf(stderr, "\n");
        
        fclose(file);
 }
@@ -229,11 +311,17 @@ void writepic(colorfunc_t f, mapfunc_t m, const char *fn, int width, int height)
 void map_all(const char *fn, colorfunc_t f, int width, int height)
 {
        char buf[1024];
+       fprintf(stderr, "%s_bk.tga\n", fn);
        snprintf(buf, sizeof(buf), "%s_bk.tga", fn); buf[sizeof(buf) - 1] = 0; writepic(f, map_back, buf, width, height);
+       fprintf(stderr, "%s_ft.tga\n", fn);
        snprintf(buf, sizeof(buf), "%s_ft.tga", fn); buf[sizeof(buf) - 1] = 0; writepic(f, map_front, buf, width, height);
+       fprintf(stderr, "%s_rt.tga\n", fn);
        snprintf(buf, sizeof(buf), "%s_rt.tga", fn); buf[sizeof(buf) - 1] = 0; writepic(f, map_right, buf, width, height);
+       fprintf(stderr, "%s_lf.tga\n", fn);
        snprintf(buf, sizeof(buf), "%s_lf.tga", fn); buf[sizeof(buf) - 1] = 0; writepic(f, map_left, buf, width, height);
+       fprintf(stderr, "%s_up.tga\n", fn);
        snprintf(buf, sizeof(buf), "%s_up.tga", fn); buf[sizeof(buf) - 1] = 0; writepic(f, map_up, buf, width, height);
+       fprintf(stderr, "%s_dn.tga\n", fn);
        snprintf(buf, sizeof(buf), "%s_dn.tga", fn); buf[sizeof(buf) - 1] = 0; writepic(f, map_down, buf, width, height);
 }
 
@@ -260,10 +348,18 @@ int main(int argc, char **argv)
                color_mandelbrot_parms[11] = argc<=15 ?   0.5   : atof(argv[15]);
                color_mandelbrot_parms[12] = argc<=16 ?   0.2   : atof(argv[16]);
        }
+       else if(!strcmp(argv[3], "starfield"))
+       {
+               f = color_starfield;
+               color_starfield_parms.n = argc<= 4 ? 8192 : atoi(argv[4]);
+               color_starfield_parms.darkness = argc<= 5 ? 0.4 : atof(argv[5]);
+               color_starfield_parms.power = argc<= 6 ? 2.5 : atof(argv[6]);
+               color_starfield_parms.density = argc<= 7 ? 60000 : atof(argv[7]);
+       }
        else
        {
                f = color_test;
        }
-       map_all(argv[1], color_mandelbrot, res, res);
+       map_all(argv[1], f, res, res);
        return 0;
 }