singe/assets/Framework.singe
2026-09-03 19:56:45 -05:00

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Text

--[[
*
* Singe 2
* Copyright (C) 2006-2024 Scott Duensing <scott@kangaroopunch.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 3
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
--]]
-- Singe 2.xx Features -------------------------------------------------------
-- SINGE_FRAMEWORK_VERSION, SWITCH_*, FONT_QUALITY_*, MODE_*, MOUSE_*, OVERLAY_*,
-- RENDER_*, DISC_*, SOUND_ERROR_* and the SINGE_* input code layout are all
-- pushed by the engine before this file runs, so they are defined in exactly
-- one place: singe.c.
if singeGetScriptPath ~= nil then
DIR = singeGetScriptPath():match("(.*[/\\])") or "./"
end
function utilDeepCopy(original)
local copy
if type(original) == 'table' then
copy = {}
for key, value in next, original, nil do
copy[utilDeepCopy(key)] = utilDeepCopy(value)
end
setmetatable(copy, utilDeepCopy(getmetatable(original)))
else -- number, string, boolean, etc
copy = original
end
return copy
end
function utilDump(o)
if type(o) == 'table' then
local s = '{ '
for k,v in pairs(o) do
if type(k) ~= 'number' then
k = '"'..k..'"'
end
s = s .. '['..k..'] = ' .. utilDump(v) .. ','
end
return s .. '} '
else
return tostring(o)
end
end
function utilGetTableSize(t)
local count = 0
for _ in pairs(t) do
count = count + 1
end
return count
end
-- Returns a copy of a { NAME = { name = NAME, value = N } } table with every value shifted.
function utilOffsetTable(source, offset)
local copy = utilDeepCopy(source)
for _, entry in pairs(copy) do
entry.value = entry.value + offset
end
return copy
end
function utilTrim(s)
return (s:gsub("^%s*(.-)%s*$", "%1"))
end
SCANCODE = {
A = { name = "A", value = 4 },
B = { name = "B", value = 5 },
C = { name = "C", value = 6 },
D = { name = "D", value = 7 },
E = { name = "E", value = 8 },
F = { name = "F", value = 9 },
G = { name = "G", value = 10 },
H = { name = "H", value = 11 },
I = { name = "I", value = 12 },
J = { name = "J", value = 13 },
K = { name = "K", value = 14 },
L = { name = "L", value = 15 },
M = { name = "M", value = 16 },
N = { name = "N", value = 17 },
O = { name = "O", value = 18 },
P = { name = "P", value = 19 },
Q = { name = "Q", value = 20 },
R = { name = "R", value = 21 },
S = { name = "S", value = 22 },
T = { name = "T", value = 23 },
U = { name = "U", value = 24 },
V = { name = "V", value = 25 },
W = { name = "W", value = 26 },
X = { name = "X", value = 27 },
Y = { name = "Y", value = 28 },
Z = { name = "Z", value = 29 },
MAIN_1 = { name = "MAIN_1", value = 30 },
MAIN_2 = { name = "MAIN_2", value = 31 },
MAIN_3 = { name = "MAIN_3", value = 32 },
MAIN_4 = { name = "MAIN_4", value = 33 },
MAIN_5 = { name = "MAIN_5", value = 34 },
MAIN_6 = { name = "MAIN_6", value = 35 },
MAIN_7 = { name = "MAIN_7", value = 36 },
MAIN_8 = { name = "MAIN_8", value = 37 },
MAIN_9 = { name = "MAIN_9", value = 38 },
MAIN_0 = { name = "MAIN_0", value = 39 },
RETURN = { name = "RETURN", value = 40 },
ESCAPE = { name = "ESCAPE", value = 41 },
BACKSPACE = { name = "BACKSPACE", value = 42 },
TAB = { name = "TAB", value = 43 },
SPACE = { name = "SPACE", value = 44 },
MINUS = { name = "MINUS", value = 45 },
EQUALS = { name = "EQUALS", value = 46 },
LEFTBRACKET = { name = "LEFTBRACKET", value = 47 },
RIGHTBRACKET = { name = "RIGHTBRACKET", value = 48 },
BACKSLASH = { name = "BACKSLASH", value = 49 },
NONUSHASH = { name = "NONUSHASH", value = 50 },
SEMICOLON = { name = "SEMICOLON", value = 51 },
APOSTROPHE = { name = "APOSTROPHE", value = 52 },
GRAVE = { name = "GRAVE", value = 53 },
COMMA = { name = "COMMA", value = 54 },
PERIOD = { name = "PERIOD", value = 55 },
SLASH = { name = "SLASH", value = 56 },
CAPSLOCK = { name = "CAPSLOCK", value = 57 },
F1 = { name = "F1", value = 58 },
F2 = { name = "F2", value = 59 },
F3 = { name = "F3", value = 60 },
F4 = { name = "F4", value = 61 },
F5 = { name = "F5", value = 62 },
F6 = { name = "F6", value = 63 },
F7 = { name = "F7", value = 64 },
F8 = { name = "F8", value = 65 },
F9 = { name = "F9", value = 66 },
F10 = { name = "F10", value = 67 },
F11 = { name = "F11", value = 68 },
F12 = { name = "F12", value = 69 },
PRINTSCREEN = { name = "PRINTSCREEN", value = 70 },
SCROLLLOCK = { name = "SCROLLLOCK", value = 71 },
PAUSE = { name = "PAUSE", value = 72 },
INSERT = { name = "INSERT", value = 73 },
HOME = { name = "HOME", value = 74 },
PAGEUP = { name = "PAGEUP", value = 75 },
DELETE = { name = "DELETE", value = 76 },
END = { name = "END", value = 77 },
PAGEDOWN = { name = "PAGEDOWN", value = 78 },
RIGHT = { name = "RIGHT", value = 79 },
LEFT = { name = "LEFT", value = 80 },
DOWN = { name = "DOWN", value = 81 },
UP = { name = "UP", value = 82 },
NUMLOCKCLEAR = { name = "NUMLOCKCLEAR", value = 83 },
KP_DIVIDE = { name = "KP_DIVIDE", value = 84 },
KP_MULTIPLY = { name = "KP_MULTIPLY", value = 85 },
KP_MINUS = { name = "KP_MINUS", value = 86 },
KP_PLUS = { name = "KP_PLUS", value = 87 },
KP_ENTER = { name = "KP_ENTER", value = 88 },
KP_1 = { name = "KP_1", value = 89 },
KP_2 = { name = "KP_2", value = 90 },
KP_3 = { name = "KP_3", value = 91 },
KP_4 = { name = "KP_4", value = 92 },
KP_5 = { name = "KP_5", value = 93 },
KP_6 = { name = "KP_6", value = 94 },
KP_7 = { name = "KP_7", value = 95 },
KP_8 = { name = "KP_8", value = 96 },
KP_9 = { name = "KP_9", value = 97 },
KP_0 = { name = "KP_0", value = 98 },
KP_PERIOD = { name = "KP_PERIOD", value = 99 },
NONUSBACKSLASH = { name = "NONUSBACKSLASH", value = 100 },
APPLICATION = { name = "APPLICATION", value = 101 },
POWER = { name = "POWER", value = 102 },
KP_EQUALS = { name = "KP_EQUALS", value = 103 },
F13 = { name = "F13", value = 104 },
F14 = { name = "F14", value = 105 },
F15 = { name = "F15", value = 106 },
F16 = { name = "F16", value = 107 },
F17 = { name = "F17", value = 108 },
F18 = { name = "F18", value = 109 },
F19 = { name = "F19", value = 110 },
F20 = { name = "F20", value = 111 },
F21 = { name = "F21", value = 112 },
F22 = { name = "F22", value = 113 },
F23 = { name = "F23", value = 114 },
F24 = { name = "F24", value = 115 },
EXECUTE = { name = "EXECUTE", value = 116 },
HELP = { name = "HELP", value = 117 },
MENU = { name = "MENU", value = 118 },
SELECT = { name = "SELECT", value = 119 },
STOP = { name = "STOP", value = 120 },
AGAIN = { name = "AGAIN", value = 121 },
UNDO = { name = "UNDO", value = 122 },
CUT = { name = "CUT", value = 123 },
COPY = { name = "COPY", value = 124 },
PASTE = { name = "PASTE", value = 125 },
FIND = { name = "FIND", value = 126 },
MUTE = { name = "MUTE", value = 127 },
VOLUMEUP = { name = "VOLUMEUP", value = 128 },
VOLUMEDOWN = { name = "VOLUMEDOWN", value = 129 },
KP_COMMA = { name = "KP_COMMA", value = 133 },
KP_EQUALSAS400 = { name = "KP_EQUALSAS400", value = 134 },
INTERNATIONAL1 = { name = "INTERNATIONAL1", value = 135 },
INTERNATIONAL2 = { name = "INTERNATIONAL2", value = 136 },
INTERNATIONAL3 = { name = "INTERNATIONAL3", value = 137 },
INTERNATIONAL4 = { name = "INTERNATIONAL4", value = 138 },
INTERNATIONAL5 = { name = "INTERNATIONAL5", value = 139 },
INTERNATIONAL6 = { name = "INTERNATIONAL6", value = 140 },
INTERNATIONAL7 = { name = "INTERNATIONAL7", value = 141 },
INTERNATIONAL8 = { name = "INTERNATIONAL8", value = 142 },
INTERNATIONAL9 = { name = "INTERNATIONAL9", value = 143 },
LANG1 = { name = "LANG1", value = 144 },
LANG2 = { name = "LANG2", value = 145 },
LANG3 = { name = "LANG3", value = 146 },
LANG4 = { name = "LANG4", value = 147 },
LANG5 = { name = "LANG5", value = 148 },
LANG6 = { name = "LANG6", value = 149 },
LANG7 = { name = "LANG7", value = 150 },
LANG8 = { name = "LANG8", value = 151 },
LANG9 = { name = "LANG9", value = 152 },
ALTERASE = { name = "ALTERASE", value = 153 },
SYSREQ = { name = "SYSREQ", value = 154 },
CANCEL = { name = "CANCEL", value = 155 },
CLEAR = { name = "CLEAR", value = 156 },
PRIOR = { name = "PRIOR", value = 157 },
RETURN2 = { name = "RETURN2", value = 158 },
SEPARATOR = { name = "SEPARATOR", value = 159 },
OUT = { name = "OUT", value = 160 },
OPER = { name = "OPER", value = 161 },
CLEARAGAIN = { name = "CLEARAGAIN", value = 162 },
CRSEL = { name = "CRSEL", value = 163 },
EXSEL = { name = "EXSEL", value = 164 },
KP_00 = { name = "KP_00", value = 176 },
KP_000 = { name = "KP_000", value = 177 },
THOUSANDSSEPARATOR = { name = "THOUSANDSSEPARATOR", value = 178 },
DECIMALSEPARATOR = { name = "DECIMALSEPARATOR", value = 179 },
CURRENCYUNIT = { name = "CURRENCYUNIT", value = 180 },
CURRENCYSUBUNIT = { name = "CURRENCYSUBUNIT", value = 181 },
KP_LEFTPAREN = { name = "KP_LEFTPAREN", value = 182 },
KP_RIGHTPAREN = { name = "KP_RIGHTPAREN", value = 183 },
KP_LEFTBRACE = { name = "KP_LEFTBRACE", value = 184 },
KP_RIGHTBRACE = { name = "KP_RIGHTBRACE", value = 185 },
KP_TAB = { name = "KP_TAB", value = 186 },
KP_BACKSPACE = { name = "KP_BACKSPACE", value = 187 },
KP_A = { name = "KP_A", value = 188 },
KP_B = { name = "KP_B", value = 189 },
KP_C = { name = "KP_C", value = 190 },
KP_D = { name = "KP_D", value = 191 },
KP_E = { name = "KP_E", value = 192 },
KP_F = { name = "KP_F", value = 193 },
KP_XOR = { name = "KP_XOR", value = 194 },
KP_POWER = { name = "KP_POWER", value = 195 },
KP_PERCENT = { name = "KP_PERCENT", value = 196 },
KP_LESS = { name = "KP_LESS", value = 197 },
KP_GREATER = { name = "KP_GREATER", value = 198 },
KP_AMPERSAND = { name = "KP_AMPERSAND", value = 199 },
KP_DBLAMPERSAND = { name = "KP_DBLAMPERSAND", value = 200 },
KP_VERTICALBAR = { name = "KP_VERTICALBAR", value = 201 },
KP_DBLVERTICALBAR = { name = "KP_DBLVERTICALBAR", value = 202 },
KP_COLON = { name = "KP_COLON", value = 203 },
KP_HASH = { name = "KP_HASH", value = 204 },
KP_SPACE = { name = "KP_SPACE", value = 205 },
KP_AT = { name = "KP_AT", value = 206 },
KP_EXCLAM = { name = "KP_EXCLAM", value = 207 },
KP_MEMSTORE = { name = "KP_MEMSTORE", value = 208 },
KP_MEMRECALL = { name = "KP_MEMRECALL", value = 209 },
KP_MEMCLEAR = { name = "KP_MEMCLEAR", value = 210 },
KP_MEMADD = { name = "KP_MEMADD", value = 211 },
KP_MEMSUBTRACT = { name = "KP_MEMSUBTRACT", value = 212 },
KP_MEMMULTIPLY = { name = "KP_MEMMULTIPLY", value = 213 },
KP_MEMDIVIDE = { name = "KP_MEMDIVIDE", value = 214 },
KP_PLUSMINUS = { name = "KP_PLUSMINUS", value = 215 },
KP_CLEAR = { name = "KP_CLEAR", value = 216 },
KP_CLEARENTRY = { name = "KP_CLEARENTRY", value = 217 },
KP_BINARY = { name = "KP_BINARY", value = 218 },
KP_OCTAL = { name = "KP_OCTAL", value = 219 },
KP_DECIMAL = { name = "KP_DECIMAL", value = 220 },
KP_HEXADECIMAL = { name = "KP_HEXADECIMAL", value = 221 },
LCTRL = { name = "LCTRL", value = 224 },
LSHIFT = { name = "LSHIFT", value = 225 },
LALT = { name = "LALT", value = 226 },
LGUI = { name = "LGUI", value = 227 },
RCTRL = { name = "RCTRL", value = 228 },
RSHIFT = { name = "RSHIFT", value = 229 },
RALT = { name = "RALT", value = 230 },
RGUI = { name = "RGUI", value = 231 },
MODE = { name = "MODE", value = 257 },
AUDIONEXT = { name = "AUDIONEXT", value = 258 },
AUDIOPREV = { name = "AUDIOPREV", value = 259 },
AUDIOSTOP = { name = "AUDIOSTOP", value = 260 },
AUDIOPLAY = { name = "AUDIOPLAY", value = 261 },
AUDIOMUTE = { name = "AUDIOMUTE", value = 262 },
MEDIASELECT = { name = "MEDIASELECT", value = 263 },
WWW = { name = "WWW", value = 264 },
MAIL = { name = "MAIL", value = 265 },
CALCULATOR = { name = "CALCULATOR", value = 266 },
COMPUTER = { name = "COMPUTER", value = 267 },
AC_SEARCH = { name = "AC_SEARCH", value = 268 },
AC_HOME = { name = "AC_HOME", value = 269 },
AC_BACK = { name = "AC_BACK", value = 270 },
AC_FORWARD = { name = "AC_FORWARD", value = 271 },
AC_STOP = { name = "AC_STOP", value = 272 },
AC_REFRESH = { name = "AC_REFRESH", value = 273 },
AC_BOOKMARKS = { name = "AC_BOOKMARKS", value = 274 },
BRIGHTNESSDOWN = { name = "BRIGHTNESSDOWN", value = 275 },
BRIGHTNESSUP = { name = "BRIGHTNESSUP", value = 276 },
DISPLAYSWITCH = { name = "DISPLAYSWITCH", value = 277 },
KBDILLUMTOGGLE = { name = "KBDILLUMTOGGLE", value = 278 },
KBDILLUMDOWN = { name = "KBDILLUMDOWN", value = 279 },
KBDILLUMUP = { name = "KBDILLUMUP", value = 280 },
EJECT = { name = "EJECT", value = 281 },
SLEEP = { name = "SLEEP", value = 282 },
APP1 = { name = "APP1", value = 283 },
APP2 = { name = "APP2", value = 284 },
AUDIOREWIND = { name = "AUDIOREWIND", value = 285 },
AUDIOFASTFORWARD = { name = "AUDIOFASTFORWARD", value = 286 }
}
MODIFIER = {
NONE = { name = "NONE", value = 0x0000 },
LSHIFT = { name = "LSHIFT", value = 0x0001 },
RSHIFT = { name = "RSHIFT", value = 0x0002 },
LCTRL = { name = "LCTRL", value = 0x0040 },
RCTRL = { name = "RCTRL", value = 0x0080 },
LALT = { name = "LALT", value = 0x0100 },
RALT = { name = "RALT", value = 0x0200 },
LGUI = { name = "LGUI", value = 0x0400 },
RGUI = { name = "RGUI", value = 0x0800 },
NUM = { name = "NUM", value = 0x1000 },
CAPS = { name = "CAPS", value = 0x2000 },
MODE = { name = "MODE", value = 0x4000 },
SCROLL = { name = "SCROLL", value = 0x8000 },
SHIFT = { name = "SHIFT", value = 0x0001 + 0x0002 },
CTRL = { name = "CTRL", value = 0x0040 + 0x0080 },
ALT = { name = "ALT", value = 0x0100 + 0x0200 },
GUI = { name = "GUI", value = 0x0400 + 0x0800 }
}
-- Controller codes are built from the engine's layout: SINGE_GAMEPAD_BASE plus
-- SINGE_GAMEPAD_STRIDE per controller; each axis takes SINGE_AXIS_STRIDE codes
-- (axis, negative direction, positive direction) and buttons follow at
-- SINGE_GAMEPAD_BUTTON_OFFSET in SDL's button order.
local function gamepadAxisCodes(axis, name, negative, positive)
local base = SINGE_GAMEPAD_BASE + axis * SINGE_AXIS_STRIDE
return {
{ name, base }, { name .. "_" .. negative, base + 1 }, { name .. "_" .. positive, base + 2 }
}
end
local gamepadCodes = {}
for _, entry in ipairs(gamepadAxisCodes(0, "AXIS_LEFT_X", "L", "R")) do gamepadCodes[#gamepadCodes + 1] = entry end
for _, entry in ipairs(gamepadAxisCodes(1, "AXIS_LEFT_Y", "U", "D")) do gamepadCodes[#gamepadCodes + 1] = entry end
for _, entry in ipairs(gamepadAxisCodes(2, "AXIS_RIGHT_X", "L", "R")) do gamepadCodes[#gamepadCodes + 1] = entry end
for _, entry in ipairs(gamepadAxisCodes(3, "AXIS_RIGHT_Y", "U", "D")) do gamepadCodes[#gamepadCodes + 1] = entry end
for _, entry in ipairs(gamepadAxisCodes(4, "AXIS_LEFT_TRIGGER", "N", "P")) do gamepadCodes[#gamepadCodes + 1] = entry end
for _, entry in ipairs(gamepadAxisCodes(5, "AXIS_RIGHT_TRIGGER", "N", "P")) do gamepadCodes[#gamepadCodes + 1] = entry end
local gamepadButtons = {
"BUTTON_A", "BUTTON_B", "BUTTON_X", "BUTTON_Y", "BUTTON_BACK", "BUTTON_GUIDE", "BUTTON_START",
"BUTTON_LEFT_STICK", "BUTTON_RIGHT_STICK", "BUTTON_LEFT_BUMPER", "BUTTON_RIGHT_BUMPER",
"DPAD_UP", "DPAD_DOWN", "DPAD_LEFT", "DPAD_RIGHT"
}
for index, name in ipairs(gamepadButtons) do
gamepadCodes[#gamepadCodes + 1] = { name, SINGE_GAMEPAD_BASE + SINGE_GAMEPAD_BUTTON_OFFSET + index - 1 }
end
GAMEPAD_0 = {}
for _, entry in ipairs(gamepadCodes) do
GAMEPAD_0[entry[1]] = { name = entry[1], value = entry[2] }
end
GAMEPAD_1 = utilOffsetTable(GAMEPAD_0, SINGE_GAMEPAD_STRIDE)
GAMEPAD_2 = utilOffsetTable(GAMEPAD_0, SINGE_GAMEPAD_STRIDE * 2)
GAMEPAD_3 = utilOffsetTable(GAMEPAD_0, SINGE_GAMEPAD_STRIDE * 3)
GAMEPAD_AXIS_LEFT_X = 0
GAMEPAD_AXIS_LEFT_Y = 1
GAMEPAD_AXIS_RIGHT_X = 2
GAMEPAD_AXIS_RIGHT_Y = 3
GAMEPAD_AXIS_LEFT_TRIGGER = 4
GAMEPAD_AXIS_RIGHT_TRIGGER = 5
-- Mouse codes: SINGE_MOUSE_BASE plus SINGE_MOUSE_STRIDE per mouse; buttons then wheel.
local mouseNames = { "BUTTON_LEFT", "BUTTON_RIGHT", "BUTTON_MIDDLE", "BUTTON_X1", "BUTTON_X2", "WHEEL_UP", "WHEEL_DOWN" }
MOUSE_0 = {}
for index, name in ipairs(mouseNames) do
MOUSE_0[name] = { name = name, value = SINGE_MOUSE_BASE + index - 1 }
end
MOUSE_1 = utilOffsetTable(MOUSE_0, SINGE_MOUSE_STRIDE)
MOUSE_2 = utilOffsetTable(MOUSE_0, SINGE_MOUSE_STRIDE * 2)
MOUSE_3 = utilOffsetTable(MOUSE_0, SINGE_MOUSE_STRIDE * 3)
-- Older names for engine functions that gained a setter.
if mouseSetEnabled ~= nil then
mouseEnable = function() mouseSetEnabled(true) end
mouseDisable = function() mouseSetEnabled(false) end
end
if singeSetPauseKeyEnabled ~= nil then
singeEnablePauseKey = function() singeSetPauseKeyEnabled(true) end
singeDisablePauseKey = function() singeSetPauseKeyEnabled(false) end
end
-- Singe 3.00 moved the sprite handle to the first argument. Games written for
-- 2.10 can set SINGE_LEGACY_SPRITE_ARGS = true (or LEGACY_SPRITE_ARGS = true in
-- games.dat) to keep calling the old way.
if SINGE_LEGACY_SPRITE_ARGS and spriteDraw ~= nil then
local newSpriteDraw = spriteDraw
spriteDraw = function(...)
local args = { ... }
local id = table.remove(args)
return newSpriteDraw(id, table.unpack(args))
end
local newSpriteLoop = spriteLoop
spriteLoop = function(loop, id) return newSpriteLoop(id, loop) end
local newSpriteQuality = spriteQuality
spriteQuality = function(smooth, id) return newSpriteQuality(id, smooth) end
local newSpriteRotate = spriteRotate
spriteRotate = function(angle, id) return newSpriteRotate(id, angle) end
local newSpriteRotateAndScale = spriteRotateAndScale
spriteRotateAndScale = function(...)
local args = { ... }
local id = table.remove(args)
return newSpriteRotateAndScale(id, table.unpack(args))
end
local newSpriteScale = spriteScale
spriteScale = function(...)
local args = { ... }
local id = table.remove(args)
return newSpriteScale(id, table.unpack(args))
end
local newSpriteSetFrame = spriteSetFrame
spriteSetFrame = function(frame, id) return newSpriteSetFrame(id, frame) end
end
if videoGetLanguageDescription ~= nil then
discGetLanguageDescription = videoGetLanguageDescription
end
-- Singe 1.xx Features -------------------------------------------------------
-- Make old random number calls still work
random = {}
random.new = math.random
-- Map old Daphne calls to Singe calls
if singeGetHeight ~= nil then
daphneGetHeight = singeGetHeight
daphneGetWidth = singeGetWidth
daphneScreenshot = singeScreenshot
end
-- Singe 2.10 Threaded Application Support ------------------------------------
if singeMain ~= nil then
local singeThread = coroutine.create(singeMain)
onOverlayUpdate = function()
local ok, err = coroutine.resume(singeThread)
if not ok then
error(err, 0)
end
if coroutine.status(singeThread) == "dead" then
singeQuit()
end
return OVERLAY_UPDATED
end
singeYield = coroutine.yield
end