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#pragma once
#include "Time.hpp"
#include "Common/Casts.hpp"
#include "Common/Sizes.hpp"
#include "Common/Pure.hpp"
#include "GFX/Window.hpp"
#include "Math/Vector.hpp"
namespace MC {
// TODO: Add some more keys.
// TODO: I think some of these keys are "modifiers" under GLFW, and should be handled differently.
enum class Key {
A, B, C, D, E, F, G, H, I, J, K, L, M,
N, O, P, Q, R, S, T, U, V, W, X, Y, Z,
Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine,
Escape, Enter, Tab, Backspace, Insert, Delete, Right, Left, Down, Up,
LeftShift, RightShift, LeftControl, RightControl, LeftAlt, RightAlt,
Space, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12,
};
constexpr USize KeyCount = 65;
static_assert(KeyCount == TO(USize, Key::F12) + 1, "Key count mismatch.");
enum class Mouse {
Left, Right, Middle,
};
constexpr USize MouseCount = 3;
static_assert(MouseCount == TO(USize, Mouse::Middle) + 1, "Mouse count mismatch.");
// The simple input system.
// All methods are thread safe, except the initial registration of the input callbacks
// and the state update. Both must be called from the main thread.
class Input {
public:
explicit Input() = default;
// Registers the input callbacks for the given window.
// This function must be called from the main thread.
static void register_callbacks(GFX::Window const& window);
// Updates the input state from the callback buffers.
// This function must be called from the main thread.
void update(Time::Timestamp current_time);
// Returns true if the key was pressed during the last frame.
PURE Bool pressed(Key key) const;
// Returns true if the mouse button was pressed during the last frame.
PURE Bool pressed(Mouse button) const;
// Returns true if the key is currently held down.
PURE Bool held(Key key) const;
// Returns true if the mouse button is currently held down.
PURE Bool held(Mouse button) const;
// Returns true if the key was released during the last frame.
PURE Bool released(Key key) const;
// Returns true if the mouse button was released during the last frame.
PURE Bool released(Mouse button) const;
// Returns true if the key was double pressed during the last frame.
// A double press is defined as two presses within a certain time frame.
PURE Bool double_pressed(Key key) const;
// Returns true if the mouse button was double pressed during the last frame.
// A double press is defined as two presses within a certain time frame.
PURE Bool double_pressed(Mouse button) const;
// Returns the position of the mouse cursor in the window.
PURE Vector<2> mouse_position() const;
// Returns the change in the position of the mouse cursor since the last frame.
PURE Vector<2> mouse_movement() const;
private:
template <typename T>
struct ButtonMap {
T keys[KeyCount] = { 0 };
T mouse_buttons[MouseCount] = { 0 };
};
struct FrameState {
ButtonMap<Bool> map;
Vec2 mouse_position = { 0, 0 };
};
std::unique_ptr<FrameState> m_state = std::make_unique<FrameState>();
std::unique_ptr<FrameState> m_previous_state = std::make_unique<FrameState>();
std::unique_ptr<ButtonMap<Time::Timestamp>> m_last_key_release = std::make_unique<ButtonMap<Time::Timestamp>>();
std::unique_ptr<ButtonMap<Bool>> m_double_press = std::make_unique<ButtonMap<Bool>>();
static Bool key_pressed(std::unique_ptr<FrameState> const& current, std::unique_ptr<FrameState> const& previous, Key key);
static Bool mouse_button_pressed(std::unique_ptr<FrameState> const& current, std::unique_ptr<FrameState> const& previous, Mouse mouse);
static Bool key_released(std::unique_ptr<FrameState> const& current, std::unique_ptr<FrameState> const& previous, Key key);
static Bool mouse_button_released(std::unique_ptr<FrameState> const& current, std::unique_ptr<FrameState> const& previous, Mouse mouse);
static Bool s_key_buffer[KeyCount];
static Bool s_mouse_buffer[MouseCount];
static Vec2 s_mouse_position;
enum class MouseEventType { None, First, Subsequent };
static MouseEventType s_mouse_event_type;
static USize key_value(Key key);
static USize mouse_button_value(Mouse button);
static Key from_glfw_key(I32 key);
static Mouse from_glfw_mouse(I32 button);
static void key_callback(GLFWwindow* _window, I32 key, I32 _scancode, I32 action, I32 _mods);
static void cursor_position_callback(GLFWwindow* _window, F64 x, F64 y);
static void mouse_button_callback(GLFWwindow* _window, I32 button, I32 action, I32 _mods);
};
}
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