Committed forgotten file necessary for gamepad inputs

1 files changed, 27 insertions, 0 deletions

diff --git a/src/inputs.zig b/src/inputs.zig
new file mode 100644
index 0000000..4d2afa0
--- /dev/null
+++ b/src/inputs.zig
@@ -0,0 +1,27 @@
+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,
+    left: bool = false,
+    right: bool = false,
+    up: bool = false,
+    down: bool = false,
+};
+
+pub const Gamepad = struct {
+    held: Buttons = .{},
+    pressed: Buttons = .{},
+    released: Buttons = .{},
+
+    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));
+    }
+};