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const std = @import("std");
const w4 = @import("wasm4.zig");
// This packed struct matches the buttons definitions in wasm4.zig
// so that a bitCast can give us named fields
pub const Buttons = packed struct {
x: bool = false,
y: bool = false,
_: u2 = 0,
left: bool = false,
right: bool = false,
up: bool = false,
down: bool = false,
};
pub const Gamepad = struct {
held: Buttons = .{},
pressed: Buttons = .{},
released: Buttons = .{},
pub fn reset(self: *Gamepad) void {
self.held = @bitCast(Buttons, @bitCast(u8, self.held) ^ @bitCast(u8, self.held));
self.pressed = @bitCast(Buttons, @bitCast(u8, self.pressed) ^ @bitCast(u8, self.pressed));
self.released = @bitCast(Buttons, @bitCast(u8, self.released) ^ @bitCast(u8, self.released));
}
pub fn update(self: *Gamepad, buttons: u8) void {
var previous = @bitCast(u8, self.held);
self.held = @bitCast(Buttons, buttons);
self.pressed = @bitCast(Buttons, buttons & (buttons ^ previous));
self.released = @bitCast(Buttons, previous & (buttons ^ previous));
}
};
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