src/core: move mach-core@9a4d09707d9f1cb6ea5602bdf58caeefc46146be package to here

Helps hexops/mach#1165

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

src/core/InputState.zig

@@ -0,0 +1,25 @@
+const std = @import("std");
+const core = @import("main.zig");
+const KeyBitSet = std.StaticBitSet(@intFromEnum(core.Key.max) + 1);
+const MouseButtonSet = std.StaticBitSet(@as(u4, @intFromEnum(core.MouseButton.max)) + 1);
+const InputState = @This();
+
+keys: KeyBitSet = KeyBitSet.initEmpty(),
+mouse_buttons: MouseButtonSet = MouseButtonSet.initEmpty(),
+mouse_position: core.Position = .{ .x = 0, .y = 0 },
+
+pub inline fn isKeyPressed(self: InputState, key: core.Key) bool {
+    return self.keys.isSet(@intFromEnum(key));
+}
+
+pub inline fn isKeyReleased(self: InputState, key: core.Key) bool {
+    return !self.isKeyPressed(key);
+}
+
+pub inline fn isMouseButtonPressed(self: InputState, button: core.MouseButton) bool {
+    return self.mouse_buttons.isSet(@intFromEnum(button));
+}
+
+pub inline fn isMouseButtonReleased(self: InputState, button: core.MouseButton) bool {
+    return !self.isMouseButtonPressed(button);
+}