Raydium 3D Game Engine

void raydium_camera_orbitmove(float x, float y, float z, float x_to, float y_to, float z_to)
{
    static float delta_x,delta_y;
    raydium_mouse_move(raydium_window_tx/2, raydium_window_ty/2);
    delta_x+= raydium_mouse_x - (raydium_window_tx/2);
    delta_y+= raydium_mouse_y - (raydium_window_ty/2);
    raydium_camera_internal_prepare();
    glRotatef(raydium_camera_look_at_roll,0,0,1);
    raydium_camera_look_at_roll=0;
    gluLookAt(x,y,z,z_to,x_to,-y_to,0.,0.,1.);
    glRotatef(delta_y,0,1,0);
    glRotatef(delta_x,0,0,1);
    raydium_camera_internal(x,y,z);
}