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glfw: add Joystick.setCallback

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
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Stephen Gutekanst 2021-10-21 22:54:07 -07:00 • committed by Stephen Gutekanst
parent 2a3a47a9a3
commit 1560e4c681
1 changed files with 49 additions and 52 deletions
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101
src/joystick.zig
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@ -33,25 +33,6 @@ pub const fifteen = c.GLFW_JOYSTICK_15;
pub const sixteen = c.GLFW_JOYSTICK_16;
pub const last = c.GLFW_JOYSTICK_LAST;
// TODO(joystick)
// /// The function pointer type for joystick configuration callbacks.
// ///
// /// This is the function pointer type for joystick configuration callbacks.
// /// A joystick configuration callback function has the following signature:
// /// @code
// /// void function_name(int jid, int event)
// /// @endcode
// ///
// /// @param[in] jid The joystick that was connected or disconnected.
// /// @param[in] event One of `GLFW_CONNECTED` or `GLFW_DISCONNECTED`. Future
// /// releases may add more events.
// ///
// /// see also: joystick_event, glfwSetJoystickCallback
// ///
// ///
// /// @ingroup input
// typedef void (* GLFWjoystickfun)(int,int);
/// Gamepad input state
///
/// This describes the input state of a gamepad.
@ -312,40 +293,43 @@ pub inline fn getUserPointer(self: Joystick, Type: anytype) ?Type {
return null;
}
var _callback: ?fn (joystick: Joystick, event: isize) void = null;
fn callbackWrapper(jid: c_int, event: c_int) callconv(.C) void {
_callback.?(Joystick{ .jid = jid }, @intCast(isize, event));
}
// TODO(joystick)
// /// Sets the joystick configuration callback.
// ///
// /// This function sets the joystick configuration callback, or removes the
// /// currently set callback. This is called when a joystick is connected to or
// /// disconnected from the system.
// ///
// /// For joystick connection and disconnection events to be delivered on all
// /// platforms, you need to call one of the [event processing](@ref events)
// /// functions. Joystick disconnection may also be detected and the callback
// /// called by joystick functions. The function will then return whatever it
// /// returns if the joystick is not present.
// ///
// /// @param[in] callback The new callback, or null to remove the currently set
// /// callback.
// /// @return The previously set callback, or null if no callback was set or the
// /// library had not been [initialized](@ref intro_init).
// ///
// /// @callback_signature
// /// @code
// /// void function_name(int jid, int event)
// /// @endcode
// /// For more information about the callback parameters, see the
// /// [function pointer type](@ref GLFWjoystickfun).
// ///
// /// Possible errors include glfw.Error.NotInitialized.
// ///
// /// @thread_safety This function must only be called from the main thread.
// ///
// /// see also: joystick_event
// ///
// ///
// /// @ingroup input
// GLFWAPI GLFWjoystickfun glfwSetJoystickCallback(GLFWjoystickfun callback);
/// Sets the joystick configuration callback.
///
/// This function sets the joystick configuration callback, or removes the currently set callback.
/// This is called when a joystick is connected to or disconnected from the system.
///
/// For joystick connection and disconnection events to be delivered on all platforms, you need to
/// call one of the event processing (see events) functions. Joystick disconnection may also be
/// detected and the callback called by joystick functions. The function will then return whatever
/// it returns if the joystick is not present.
///
/// @param[in] callback The new callback, or null to remove the currently set callback.
///
/// @callback_param `jid` The joystick that was connected or disconnected.
/// @callback_param `event` One of `glfw.connected` or `glfw.disconnected`. Future releases may add
/// more events.
///
/// Possible errors include glfw.Error.NotInitialized.
///
/// @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: isize) void) void {
_callback = callback;
_ = if (_callback != null) c.glfwSetJoystickCallback(callbackWrapper) else c.glfwSetJoystickCallback(null);
// The only error this could return would be glfw.Error.NotInitialized, which should
// definitely have occurred before calls to this. Returning an error here makes the API
// awkward to use, so we discard it instead.
getError() catch {};
}
/// Adds the specified SDL_GameControllerDB gamepad mappings.
///
@ -479,6 +463,19 @@ test "getUserPointer_syntax" {
_ = joystick.getUserPointer;
}
test "setCallback" {
const glfw = @import("main.zig");
try glfw.init();
defer glfw.terminate();
glfw.Joystick.setCallback((struct {
pub fn callback(joystick: Joystick, event: isize) void {
_ = joystick;
_ = event;
}
}).callback);
}
test "updateGamepadMappings_syntax" {
// We don't have a gamepad mapping to test with, just confirm the syntax is good.
_ = updateGamepadMappings;