mame lua - HUD drawing

hud-101.lua

-- enumerate screens
-- (main screen is often tagged as ":screen")
for i,v in pairs(manager:machine().screens) do print(i) end;

-- print main screen width/height
print(manager:machine().screens[":screen"]:width())
print(manager:machine().screens[":screen"]:height())

-- draw stuff on main screen: text, line, box
-- (all colors are in argb format)
manager:machine().screens[":screen"]:draw_text(40, 40, "foo") -- (x0, y0, msg)
manager:machine().screens[":screen"]:draw_box(20, 20, 80, 80, 0, 0xff00ffff) -- (x0, y0, x1, y1, fill-color, line-color)
manager:machine().screens[":screen"]:draw_line(20, 20, 80, 80, 0xff00ffff) -- (x0, y0, x1, y1, line-color)

-- this is useful for compat with mamerr/luarr
gui = manager:machine().screens[":screen"]