Sample XPlane Hello World plugin in Zig

main.zig

const std = @import("std");
const xplm = @import("xplm");

var g_window: xplm.XPLMWindowID = std.mem.zeroes(xplm.XPLMWindowID);

pub export fn draw_hello_world(in_window_id: xplm.XPLMWindowID, in_refcon: ?*c_void) callconv(.C) void {
    _ = in_refcon;
    _ = in_window_id;
}

pub export fn dummy_mouse_handler(in_window_id: xplm.XPLMWindowID, x: c_int, y: c_int, is_down: c_int, in_refcon: ?*c_void) callconv(.C) c_int {
    _ = in_window_id;
    _ = x;
    _ = y;
    _ = is_down;
    _ = in_refcon;
    return 0;
}

pub export fn dummy_cursor_status_handler(in_window_id: xplm.XPLMWindowID, x: c_int, y: c_int, in_refcon: ?*c_void) callconv(.C) xplm.XPLMCursorStatus {
    _ = in_window_id;
    _ = x;
    _ = y;
    _ = in_refcon;
    return xplm.xplm_CursorDefault;
}

pub export fn dummy_wheel_handler(in_window_id: xplm.XPLMWindowID, x: c_int, y: c_int, wheel: c_int, clicks: c_int, in_refcon: ?*c_void) callconv(.C) c_int {
    _ = in_window_id;
    _ = x;
    _ = y;
    _ = wheel;
    _ = clicks;
    _ = in_refcon;
    return 0;
}

pub export fn dummy_key_handler(in_window_id: xplm.XPLMWindowID, key: u8, flags: xplm.XPLMKeyFlags, virtual_key: u8, in_refcon: ?*c_void, losing_focus: c_int) callconv(.C) void {
    _ = in_window_id;
    _ = key;
    _ = flags;
    _ = virtual_key;
    _ = in_refcon;
    _ = losing_focus;
}

pub export fn XPluginStart(outName: [*c]u8, outSig: [*c]u8, outDesc: [*c]u8) callconv(.C) c_int {
    _ = xplm.strcpy(outName, "HelloWorld3Plugin");
    _ = xplm.strcpy(outSig, "xpsdk.examples.helloworld3plugin");
    _ = xplm.strcpy(outDesc, "A Hello World plug-in for the XPLM300 SDK.");
    var params: xplm.XPLMCreateWindow_t = undefined;
    params.structSize = @bitCast(c_int, @truncate(c_uint, @sizeOf(xplm.XPLMCreateWindow_t)));
    params.visible = 1;
    params.drawWindowFunc = draw_hello_world;
    params.handleMouseClickFunc = dummy_mouse_handler;
    params.handleRightClickFunc = dummy_mouse_handler;
    params.handleMouseWheelFunc = dummy_wheel_handler;
    params.handleKeyFunc = dummy_key_handler;
    params.handleCursorFunc = dummy_cursor_status_handler;
    params.refcon = @intToPtr(?*c_void, @as(c_int, 0));
    params.layer = xplm.xplm_WindowLayerFloatingWindows;
    params.decorateAsFloatingWindow = xplm.xplm_WindowDecorationRoundRectangle;
    var left: c_int = undefined;
    var bottom: c_int = undefined;
    var right: c_int = undefined;
    var top: c_int = undefined;
    xplm.XPLMGetScreenBoundsGlobal(&left, &top, &right, &bottom);
    params.left = left + @as(c_int, 50);
    params.bottom = bottom + @as(c_int, 150);
    params.right = params.left + @as(c_int, 200);
    params.top = params.bottom + @as(c_int, 200);
    g_window = xplm.XPLMCreateWindowEx(&params);
    xplm.XPLMSetWindowPositioningMode(g_window, xplm.xplm_WindowPositionFree, -@as(c_int, 1));
    xplm.XPLMSetWindowResizingLimits(g_window, @as(c_int, 200), @as(c_int, 200), @as(c_int, 300), @as(c_int, 300));
    xplm.XPLMSetWindowTitle(g_window, "Sample Window");
    return @boolToInt(g_window != @intToPtr(?*c_void, @as(c_int, 0)));
}