if (!surface_exists(surf))
    surf = surface_create(512, 512);
timer++;
surface_set_target(surf);
draw_clear_alpha(c_white, 0);
var cx = (camerax() / 2) - 200;
var cy = (cameray() / 2) - 200;
var cw = cx + 400 + (camerawidth() / 2);
var ch = cy + 400 + (cameraheight() / 2);
for (var i = 0; i < array_length(canopies); i++)
{
    var canopy = canopies[i];
    if (canopy[_X] >= cx && canopy[_X] <= cw && canopy[_Y] >= cy && canopy[_Y] <= ch)
        draw_sprite_ext(sprite_index, canopy[_INDEX], (canopy[_X] + (sin((timer * canopy[_MULT]) + canopy[_OFFSET]) * 8)) - cx, canopy[_Y] - cy, 1, 1, canopy[_ROT], c_black, 1);
}
surface_reset_target();
draw_surface_ext(surf, camerax() - 200, cameray() - 200, 2, 2, 0, shadowcolor, shadowalpha);