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glfw: add Monitor.setCallback

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2021-07-17 15:31:31 -07:00
parent 30debe452c
commit 9cac08b3b9
1 changed files with 59 additions and 0 deletions
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59
glfw/src/Monitor.zig
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@ -226,6 +226,50 @@ pub inline fn getPrimary() !?Monitor {
return Monitor{ .handle = handle.? };
}
var callback_fn_ptr: ?usize = null;
var callback_data_ptr: ?usize = undefined;
/// Sets the monitor configuration callback.
///
/// This function sets the monitor configuration callback, or removes the currently set callback.
/// This is called when a monitor is connected to or disconnected from the system. Example:
///
/// ```
/// fn monitorCallback(monitor: glfw.Monitor, event: ) callconv(.C) void {
/// // use monitor, set/get user data via monitor.setUserPointer, etc.
/// }
/// ...
/// glfw.Monitor.setCallback(monitorCallback)
/// ```
///
/// Possible errors include glfw.Error.NotInitialized.
///
/// @thread_safety This function must only be called from the main thread.
///
/// see also: monitor_event
pub inline fn setCallback(comptime Data: type, data: *Data, f: ?*const fn (monitor: Monitor, event: usize, data: *Data) void) Error!void {
if (f) |new_callback| {
callback_fn_ptr = @ptrToInt(new_callback);
callback_data_ptr = @ptrToInt(data);
const NewCallback = @TypeOf(new_callback);
_ = c.glfwSetMonitorCallback((struct {
fn callbackC(monitor: ?*c.GLFWmonitor, event: c_int) callconv(.C) void {
const callback = @intToPtr(NewCallback, callback_fn_ptr.?);
callback.*(
Monitor{.handle = monitor.? },
@intCast(usize, event),
@intToPtr(*Data, callback_data_ptr.?),
);
}
}).callbackC);
} else {
_ = c.glfwSetMonitorCallback(null);
callback_fn_ptr = null;
callback_data_ptr = null;
}
try getError();
}
test "getAll" {
const glfw = @import("main.zig");
try glfw.init();
@ -315,3 +359,18 @@ test "getName" {
// try testing.expectEqual(p.?.*, 5);
// }
// }
test "setCallback" {
const glfw = @import("main.zig");
try glfw.init();
defer glfw.terminate();
var custom_data: u32 = 5;
try setCallback(u32, &custom_data, &(struct {
fn callback(monitor: Monitor, event: usize, data: *u32) void {
_ = monitor;
_ = event;
_ = data;
}
}).callback);
}