Merge branch 'master' of git://git.xonotic.org/xonotic/xonotic

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

diff --git a/misc/tools/brightspot.c b/misc/tools/brightspot.c
index fe3bb6b8ee5bebbf3bc3d0b10cb4cb0a9759c93e..fee8074c741a6ea63ce553d0d3a68f82bcbe361b 100644 (file)
--- a/misc/tools/brightspot.c
+++ b/misc/tools/brightspot.c
@@ -52,6 +52,20 @@ static const double skyboxtexcoord2f[6*4*2] =
     0, 0
 };
 
+#define GET_SKY_IMAGE(x,y,z) \
+       (fabs(x)>=fabs(y) && fabs(x)>=fabs(z)) ?  (((x) > 0) ? 0 : 1) : \
+       (fabs(y)>=fabs(x) && fabs(y)>=fabs(z)) ?  (((y) > 0) ? 2 : 3) : \
+                                                 (((z) > 0) ? 4 : 5)
+
+int highest[6] =
+{
+       0,
+       0,
+       1,
+       1,
+       2,
+       2
+};
 
 static const double skyboxvertex3f[6*4*3] =
 {
@@ -117,6 +131,56 @@ void Map3f(double u, double v, const double *corners, double *x, double *y, doub
        *z = corners[2] + u * (corners[5] - corners[2]) + v * (corners[8] - corners[5]);
 }
 
+void Map2f(double u, double v, const double *corners, double *x, double *y)
+{
+       *x = u * (corners[2] - corners[0]) + v * (corners[4] - corners[2]) + corners[0];
+       *y = u * (corners[3] - corners[1]) + v * (corners[5] - corners[3]) + corners[1];
+}
+
+void Unmap3f(double x, double y, double z, const double *corners, double *u, double *v)
+{
+       //*x = corners[0] + u * (corners[3] - corners[0]) + v * (corners[6] - corners[3]);
+       //*y = corners[1] + u * (corners[4] - corners[1]) + v * (corners[7] - corners[4]);
+       //*z = corners[2] + u * (corners[5] - corners[2]) + v * (corners[8] - corners[5]);
+       // THREE equations, TWO would be better! Let's simply use the two "better" ones
+       
+       double xc0 = x - corners[0];
+       double yc1 = y - corners[1];
+       double zc2 = z - corners[2];
+       double c30 = corners[3] - corners[0];
+       double c41 = corners[4] - corners[1];
+       double c52 = corners[5] - corners[2];
+       double c63 = corners[6] - corners[3];
+       double c74 = corners[7] - corners[4];
+       double c85 = corners[8] - corners[5];
+
+       double det_x = c41 * c85 - c52 * c74;
+       double det_y = c30 * c85 - c52 * c63;
+       double det_z = c30 * c74 - c41 * c63;
+
+       if(fabs(det_x) >= fabs(det_y) && fabs(det_x) >= fabs(det_z))
+       {
+               double du = yc1 * c85 - zc2 * c74;
+               double dv = c41 * zc2 - c52 * yc1;
+               *u = du / det_x;
+               *v = dv / det_x;
+       }
+       else if(fabs(det_y) >= fabs(det_z))
+       {
+               double du = xc0 * c85 - zc2 * c63;
+               double dv = c30 * zc2 - c52 * xc0;
+               *u = du / det_y;
+               *v = dv / det_y;
+       }
+       else
+       {
+               double du = xc0 * c74 - yc1 * c63;
+               double dv = c30 * yc1 - c41 * xc0;
+               *u = du / det_z;
+               *v = dv / det_z;
+       }
+}
+
 void MapCoord(int pic, int y, int x, double vec[3])
 {
        int h;
@@ -140,6 +204,44 @@ void MapCoord(int pic, int y, int x, double vec[3])
        Map3f(u, v, skyboxvertex3f + 6*2*pic, &vec[0], &vec[1], &vec[2]);
 }
 
+void UnmapCoord(const double vec_[3], int *pic, int *y, int *x)
+{
+       int h;
+       int flipx;
+       int flipy;
+       int flipdiag;
+       double u, v, xx, yy;
+       double f;
+       double vec[3];
+
+       // identify which pic it is
+       *pic = GET_SKY_IMAGE(vec_[0], vec_[1], vec_[2]);
+       f = 16.0/fabs(vec_[highest[*pic]]);
+       vec[0] = vec_[0] * f;
+       vec[1] = vec_[1] * f;
+       vec[2] = vec_[2] * f;
+       flipx = flip[3*(*pic)+0];
+       flipy = flip[3*(*pic)+1];
+       flipdiag = flip[3*(*pic)+2];
+
+       *x = *y = 0;
+       Unmap3f(vec[0], vec[1], vec[2], skyboxvertex3f + 6*2*(*pic), &u, &v);
+       Map2f(u, v, skyboxtexcoord2f + 4*2*(*pic), &xx, &yy);
+       *x = (int) (xx * 512.0 + 0.5);
+       *y = (int) (yy * 512.0 + 0.5);
+
+       if(flipdiag)
+       {
+               h = *x; *x = *y; *y = h;
+       }
+
+       if(flipy)
+               *y = 511 - *y;
+
+       if(flipx)
+               *x = 511 - *x;
+}
+
 int main(int argc, char **argv)
 {
        FILE *f;
@@ -185,11 +287,18 @@ int main(int argc, char **argv)
                        }
 
        l = sqrt(brightvec[0]*brightvec[0] + brightvec[1]*brightvec[1] + brightvec[2]*brightvec[2]);
-       fprintf(stderr, "vec = %f %f %f\n", brightvec[0] / l, brightvec[1] / l, brightvec[2] / l);
+       l /= 16;
+       brightvec[0] /= l;
+       brightvec[1] /= l;
+       brightvec[2] /= l;
+       fprintf(stderr, "vec = %f %f %f\n", brightvec[0], brightvec[1], brightvec[2]);
+       UnmapCoord(brightvec, &i, &j, &k);
+       fprintf(stderr, "picture %d pixel (%d %d) value %d\n", i, k, j, picture[i][j][k]);
        
        pitch = atan2(brightvec[2], sqrt(brightvec[0]*brightvec[0] + brightvec[1]*brightvec[1]));
        yaw = atan2(brightvec[1], brightvec[0]);
 
        printf("%f %f\n", yaw * 180 / M_PI, pitch * 180 / M_PI);
+
        return 0;
 }