A Paste by Anonymous

1

void texture::composenormalmap(texture * input,float scale) {     unsigned int i;     unsigned int x,y;     float nx,ny,nz;                    // normal values     float len;     float dneg,dpos,val_xy,val_last,val_next;     for (i=0; i<size_sqr; i++)     {         x = (i % size);         y = (i / size);         // calculate dx                 val_xy  =input->hmap [getpixeladress(TC_HMAP,x  ,y)];         val_next=input->hmap [getpixeladress(TC_HMAP,x+1,y)];         val_last=input->hmap [getpixeladress(TC_HMAP,x-1,y)];         // calculate difference along x axis in both directions relative to the current pixel at (x,y)         dneg = val_xy   - val_last;         dpos = val_next - val_xy;                  nx=scale*(-(dpos+dneg)/2);         // calculate dy         val_xy  =input->hmap [getpixeladress(TC_HMAP,x,y  )];         val_next=input->hmap [getpixeladress(TC_HMAP,x,y+1)];         val_last=input->hmap [getpixeladress(TC_HMAP,x,y-1)];         // calculate difference along y axis in both directions relative to the current pixel at (x,y)         dneg = val_xy   - val_last;         dpos = val_next - val_xy;         ny= scale*((dpos+dneg)/2);         nz=0.12f;                  // calculate normalized normal vector & convert it from -1.0f..1.0f range to 0.0f..1.0f range         len = (float) (1/sqrt(nx*nx + ny*ny + nz*nz));         nx*=len; ny*=len; nz*=len;         nx+=1.0f; ny+=1.0f; nz+=1.0f;         nx/=2.0f; ny/=2.0f; nz/=2.0f;         colarr [getpixeladress(TC_RGB,x,y)+0] = clampval(nx);         colarr [getpixeladress(TC_RGB,x,y)+1] = clampval(ny);         colarr [getpixeladress(TC_RGB,x,y)+2] = clampval(nz);     } }