-void vox_framebuf(struct voxscape *vox, int xres, int yres, void *fb, int horizon);
-/* negative height for auto at -h above terrain */
-void vox_view(struct voxscape *vox, int32_t x, int32_t y, int h, int32_t angle);
-void vox_proj(struct voxscape *vox, int fov, int znear, int zfar);