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annotate src/xlib_helpers.nim @ 2:213fdf8d31dd

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did: hello world triangle, a bit of code organization
author Sam <sam@basx.dev>
date Mon, 19 Dec 2022 10:41:20 +0700
parents 5daf3f236d87
children
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1 import
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2 x11/xlib,
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3 x11/xutil,
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4 x11/x,
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5 x11/keysym
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6
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7 export keysym
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8
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9 var deleteMessage*: Atom
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10
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11 template checkXlibResult*(call: untyped) =
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12 let value = call
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13 if value == 0:
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14 raise newException(Exception, "Xlib error: " & astToStr(call) & " returned " & $value)
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15
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16 proc xlibInit*(): (PDisplay, Window) =
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17 checkXlibResult XInitThreads()
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18 let display = XOpenDisplay(nil)
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19 if display == nil:
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20 quit "Failed to open display"
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21
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22 let
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23 screen = XDefaultScreen(display)
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24 rootWindow = XRootWindow(display, screen)
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25 foregroundColor = XBlackPixel(display, screen)
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26 backgroundColor = XWhitePixel(display, screen)
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27
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28 let window = XCreateSimpleWindow(display, rootWindow, -1, -1, 800, 600, 0, foregroundColor, backgroundColor)
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29 checkXlibResult XSetStandardProperties(display, window, "Nim X11", "window", 0, nil, 0, nil)
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30 checkXlibResult XSelectInput(display, window, ButtonPressMask or KeyPressMask or ExposureMask)
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31 checkXlibResult XMapWindow(display, window)
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32
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33 deleteMessage = XInternAtom(display, "WM_DELETE_WINDOW", XBool(false))
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34 checkXlibResult XSetWMProtocols(display, window, addr(deleteMessage), 1)
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35
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36 return (display, window)
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37
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38 proc xlibFramebufferSize*(display: PDisplay, window: Window): (int, int) =
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39 var attribs: XWindowAttributes
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40 checkXlibResult XGetWindowAttributes(display, window, addr(attribs))
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41 return (int(attribs.width), int(attribs.height))