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InputHandler.cpp
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InputHandler.cpp
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#include "InputHandler.h"
#include <cassert> // assert
#include <algorithm> // std::copy
#include <SDL.h>
#include "renderer/Renderer.h"
#include "debugging/Debug.h"
#include "interface/Window.h"
// TODO: Fix GetMouseAbsolutePosition function
namespace ptgn {
namespace internal {
void SDLInputHandler::Update() {
// Update previous key states.
UpdateKeyStates();
// Update mouse states.
UpdateMouseState(Mouse::LEFT);
UpdateMouseState(Mouse::RIGHT);
UpdateMouseState(Mouse::MIDDLE);
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_MOUSEBUTTONDOWN: {
auto [state, timer] = GetMouseStateAndTimer(static_cast<Mouse>(event.button.button));
timer->Start();
*state = MouseState::DOWN;
break;
}
case SDL_MOUSEBUTTONUP: {
auto [state, timer] = GetMouseStateAndTimer(static_cast<Mouse>(event.button.button));
timer->Reset();
*state = MouseState::UP;
break;
}
case SDL_QUIT: {
window::Destroy();
break;
}
// Possible window events here in the future.
/*
case SDL_WINDOWEVENT: {
switch (event.window.event) {
default:
break;
}
break;
}
*/
default:
break;
}
}
}
void SDLInputHandler::UpdateKeyStates() {
const auto key_states{ SDL_GetKeyboardState(NULL) };
// Copy current key states to previous key states.
std::copy(key_states, key_states + KEY_COUNT, std::begin(previous_key_states_));
}
void SDLInputHandler::UpdateMouseState(Mouse button) {
auto [state, timer] = GetMouseStateAndTimer(button);
if (timer->IsRunning() && *state == MouseState::DOWN) {
*state = MouseState::PRESSED;
} else if (!timer->IsRunning() && *state == MouseState::UP) {
*state = MouseState::RELEASED;
}
}
std::pair<MouseState*, Timer*> SDLInputHandler::GetMouseStateAndTimer(Mouse button) {
switch (button) {
case Mouse::LEFT:
return { &left_mouse_, &left_mouse_timer_ };
case Mouse::RIGHT:
return { &right_mouse_, &right_mouse_timer_ };
case Mouse::MIDDLE:
return { &middle_mouse_, &middle_mouse_timer_ };
default:
break;
}
assert(!"Input handler cannot retrieve state and timer for invalid mouse button");
return { nullptr, nullptr };
}
V2_int SDLInputHandler::GetMouseScreenPosition() const {
// Grab latest mouse events from queue.
SDL_PumpEvents();
// Update mouse position.
V2_int mouse_position;
SDL_GetMouseState(&mouse_position.x, &mouse_position.y);
return mouse_position;
}
V2_int SDLInputHandler::GetMouseAbsolutePosition() const {
//return WorldRenderer::ScreenToWorld(GetMouseScreenPosition());
return {};
}
MouseState SDLInputHandler::GetMouseState(Mouse button) const {
switch (button) {
case Mouse::LEFT:
return left_mouse_;
case Mouse::RIGHT:
return right_mouse_;
case Mouse::MIDDLE:
return middle_mouse_;
default:
return left_mouse_;
}
}
bool SDLInputHandler::MousePressed(Mouse button) const {
auto state{ GetMouseState(button) };
return state == MouseState::PRESSED || state == MouseState::DOWN;
}
bool SDLInputHandler::MouseReleased(Mouse button) const {
auto state{ GetMouseState(button) };
return state == MouseState::RELEASED || state == MouseState::UP;
}
bool SDLInputHandler::MouseDown(Mouse button) const {
return GetMouseState(button) == MouseState::DOWN;
}
bool SDLInputHandler::MouseUp(Mouse button) const {
return GetMouseState(button) == MouseState::UP;
}
bool SDLInputHandler::KeyPressed(Key key) const {
const auto key_states{ SDL_GetKeyboardState(NULL) };
auto key_number{ static_cast<std::size_t>(key) };
assert(key_number < KEY_COUNT && "Could not find key in input handler key states");
return key_states[key_number];
}
bool SDLInputHandler::KeyReleased(Key key) const {
return !KeyPressed(key);
}
bool SDLInputHandler::KeyDown(Key key) const {
return KeyPressed(key) && !previous_key_states_[static_cast<std::size_t>(key)];
}
bool SDLInputHandler::KeyUp(Key key) const {
return KeyReleased(key) && previous_key_states_[static_cast<std::size_t>(key)];
}
SDLInputHandler& GetSDLInputHandler() {
static SDLInputHandler sdl_input_handler;
return sdl_input_handler;
}
} // namespace internal
namespace services {
interfaces::InputHandler& GetInputHandler() {
return internal::GetSDLInputHandler();
}
} // namespace services
} // namespace ptgn