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glfw: use comptime magic to remove InternalUserPointer and associated overhead

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This commit is contained in:
Lee Cannon 2022-02-09 23:03:35 +00:00 • committed by Stephen Gutekanst
parent 8d2a4cd8d2
commit 6f32a338c0
5 changed files with 330 additions and 262 deletions
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26
glfw/src/Joystick.zig
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@ -352,12 +352,6 @@ pub const Event = enum(c_int) {
disconnected = c.GLFW_DISCONNECTED,
};
var _callback: ?fn (joystick: Joystick, event: Event) void = null;
fn callbackWrapper(jid: c_int, event: c_int) callconv(.C) void {
_callback.?(Joystick{ .jid = @intToEnum(Joystick.Id, jid) }, @intToEnum(Event, event));
}
/// Sets the joystick configuration callback.
///
/// This function sets the joystick configuration callback, or removes the currently set callback.
@ -379,10 +373,24 @@ fn callbackWrapper(jid: c_int, event: c_int) callconv(.C) void {
/// @thread_safety This function must only be called from the main thread.
///
/// see also: joystick_event
pub inline fn setCallback(callback: ?fn (joystick: Joystick, event: Event) void) void {
pub inline fn setCallback(comptime callback: ?fn (joystick: Joystick, event: Event) void) void {
internal_debug.assertInitialized();
_callback = callback;
_ = if (_callback != null) c.glfwSetJoystickCallback(callbackWrapper) else c.glfwSetJoystickCallback(null);
if (callback) |user_callback| {
const CWrapper = struct {
pub fn joystickCallbackWrapper(jid: c_int, event: c_int) callconv(.C) void {
@call(.{ .modifier = .always_inline }, user_callback, .{
Joystick{ .jid = @intToEnum(Joystick.Id, jid) },
@intToEnum(Event, event),
});
}
};
if (c.glfwSetJoystickCallback(CWrapper.joystickCallbackWrapper) != null) return;
} else {
if (c.glfwSetJoystickCallback(null) != null) return;
}
getError() catch |err| return switch (err) {
Error.NotInitialized => unreachable,
else => unreachable,