GML script. Will fade the screen to the chosen color. Returns true when done. This can be used to change rooms when it returns. Line 6 can be un-commented to do the fade to color in steps, to simulate old-school style color fading.

draw_fade_color

///draw_fade_color(color,speed/alplha)
alert(0,"Fading..." + "(" + (string(color_fade_alpha)) +"). Cannot pause game." )
can_pause = false;

depth = -100000
var snapped = color_fade_alpha//= floor(color_fade_alpha * 10)/10
draw_set_colour(argument0)
draw_set_alpha(snapped);
draw_rectangle(0, 0, view_xview [0] + view_wview[0], view_yview[0] + view_hview[0], false);
draw_set_blend_mode_ext(bm_src_colour,bm_zero);

color_fade_alpha += argument1;



draw_set_blend_mode(bm_normal);
draw_set_alpha(1);


if color_fade_alpha >= 1
{
    color_fade_alpha = 0
    return true
}