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Source/Input/Input.cppm

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+module;
+
+#include <array>
+#include <cassert>
+#include <utility>
+
+export module VUI:Input;
+
+import :InputCodes;
+import :Keys;
+
+namespace VUI {
+struct WindowManager;
+struct Window;
+constexpr uint32_t DownMask = 1;
+constexpr uint32_t RepeatMask = 1 << 2;
+
+static std::array<uint8_t, std::to_underlying(KeyCodes::KEYLAST)> s_Keys{};
+
+static constexpr std::array<KeyCodes, Keys> InputKeys = InitKeys();
+
+export struct Input {
+  static bool IsKeyDown(const KeyCodes key) {
+    return s_Keys[std::to_underlying(key)] & DownMask;
+  }
+
+  static bool IsKeyPressed(const KeyCodes key) {
+    const auto value = s_Keys[std::to_underlying(key)];
+    return value & DownMask && !(value & RepeatMask);
+  }
+
+  static bool IsKeyRepeat(const KeyCodes key) {
+    return s_Keys[std::to_underlying(key)] & RepeatMask;
+  }
+
+private:
+  static void UpdateKey(uint32_t key, bool isDown);
+  static void PostFrameUpdate();
+  friend WindowManager;
+  friend Window;
+};
+
+void Input::UpdateKey(const uint32_t key, const bool isDown) {
+  assert(key < InputKeys.size() && "Keycode out of range");
+  const uint8_t keyCode = std::to_underlying(InputKeys[key]);
+  uint8_t value = s_Keys[keyCode];
+  if (isDown) {
+    value |= DownMask;
+  } else {
+    value &= ~(DownMask | RepeatMask);
+  }
+  s_Keys[keyCode] = value;
+}
+
+void Input::PostFrameUpdate() {
+  for (uint8_t &s_key : s_Keys)
+    s_key |= s_key & DownMask ? RepeatMask : 0;
+}
+} // namespace VUI