Shadow System Code

//create event

shadow_surface = surface_create(480, 384);

//draw event

if !surface_exists(shadow_surface){
	shadow_surface = surface_create(480, 384);
};

var viewX = camera_get_view_x(view_camera[0]);
var viewY = camera_get_view_y(view_camera[0]);

surface_set_target(shadow_surface);
draw_clear_alpha(c_black, 0);

gpu_set_fog(true, c_black, 0, 1);

with (obj_shadow_parent){
	var sx = (sprite_width/2) +12;
	var sy = (sprite_height/2) +12;

	draw_sprite_pos(sprite_index, image_index,
		x-(sprite_width/2)-viewX-sx,
		y+(sprite_height/2)-viewY-sy,
		x+(sprite_width/2)-viewX-sx,
		y+(sprite_height/2)-viewY-sy,
		x+(sprite_width/2)-viewX,
		y+(sprite_height/2)-viewY,
		x-(sprite_width/2)-viewX,
		y+(sprite_height/2)-viewY,
		1);

};

gpu_set_fog(false, c_white, 0, 0);

surface_reset_target();
draw_set_alpha(.25);
draw_surface(shadow_surface, viewX, viewY);
draw_set_alpha(1);