volcano_2022/source/common/input.cpp

#include "input.h"
#include <iostream>

// Constructor
Input::Input(std::string file)
{
	// Fichero gamecontrollerdb.txt
	dbPath = file;

	// Inicializa las variables
	keyBindings_t kb;
	kb.scancode = 0;
	kb.active = false;
	keyBindings.resize(17, kb);

	GameControllerBindings_t gcb;
	gcb.button = SDL_CONTROLLER_BUTTON_INVALID;
	gcb.active = false;
	gameControllerBindings.resize(17, gcb);

	// Comprueba si hay un mando conectado
	discoverGameController();
}

// Destructor
Input::~Input()
{
}

// Asigna uno de los posibles inputs a una tecla del teclado
void Input::bindKey(Uint8 input, SDL_Scancode code)
{
	keyBindings.at(input).scancode = code;
}

// Asigna uno de los posibles inputs a un botón del mando
void Input::bindGameControllerButton(Uint8 input, SDL_GameControllerButton button)
{
	gameControllerBindings.at(input).button = button;
}

// Comprueba si un input esta activo
bool Input::checkInput(Uint8 input, bool repeat, int device, int index)
{
	bool successKeyboard = false;
	bool successGameController = false;

	if (device == INPUT_USE_ANY)
		index = 0;

	if (device == INPUT_USE_KEYBOARD || device == INPUT_USE_ANY)
	{
		const Uint8 *keyStates = SDL_GetKeyboardState(nullptr);

		if (repeat)
		{
			if (keyStates[keyBindings.at(input).scancode] != 0)
			{
				successKeyboard = true;
			}
			else
			{
				successKeyboard = false;
			}
		}
		else
		{
			if (!keyBindings.at(input).active)
			{
				if (keyStates[keyBindings.at(input).scancode] != 0)
				{
					keyBindings.at(input).active = true;
					successKeyboard = true;
				}
				else
				{
					successKeyboard = false;
				}
			}
			else
			{
				if (keyStates[keyBindings.at(input).scancode] == 0)
				{
					keyBindings.at(input).active = false;
					successKeyboard = false;
				}
				else
				{
					successKeyboard = false;
				}
			}
		}
	}

	if (gameControllerFound())
		if ((device == INPUT_USE_GAMECONTROLLER) || (device == INPUT_USE_ANY))
		{
			if (repeat)
			{
				if (SDL_GameControllerGetButton(connectedControllers.at(index), gameControllerBindings.at(input).button) != 0)
				{
					successGameController = true;
				}
				else
				{
					successGameController = false;
				}
			}
			else
			{
				if (!gameControllerBindings.at(input).active)
				{
					if (SDL_GameControllerGetButton(connectedControllers.at(index), gameControllerBindings.at(input).button) != 0)
					{
						gameControllerBindings.at(input).active = true;
						successGameController = true;
					}
					else
					{
						successGameController = false;
					}
				}
				else
				{
					if (SDL_GameControllerGetButton(connectedControllers.at(index), gameControllerBindings.at(input).button) == 0)
					{
						gameControllerBindings.at(input).active = false;
						successGameController = false;
					}
					else
					{
						successGameController = false;
					}
				}
			}
		}

	return (successKeyboard || successGameController);
}

// Comprueba si hay almenos un input activo
bool Input::checkAnyInput(int device, int index)
{
	if (device == INPUT_USE_ANY)
	{
		index = 0;
	}

	if (device == INPUT_USE_KEYBOARD || device == INPUT_USE_ANY)
	{
		const Uint8 *mKeystates = SDL_GetKeyboardState(nullptr);

		for (int i = 0; i < (int)keyBindings.size(); ++i)
		{
			if (mKeystates[keyBindings.at(i).scancode] != 0)
			{
				return true;
			}
		}
	}

	if (gameControllerFound())
	{
		if (device == INPUT_USE_GAMECONTROLLER || device == INPUT_USE_ANY)
		{
			for (int i = 0; i < (int)gameControllerBindings.size(); ++i)
			{
				if (SDL_GameControllerGetButton(connectedControllers.at(index), gameControllerBindings.at(i).button) != 0)
				{
					return true;
				}
			}
		}
	}

	return false;
}

// Comprueba si hay un mando conectado
bool Input::discoverGameController()
{
	bool found = false;

	if (SDL_WasInit(SDL_INIT_GAMECONTROLLER) != 1)
	{
		SDL_InitSubSystem(SDL_INIT_GAMECONTROLLER);
	}

	if (SDL_GameControllerAddMappingsFromFile(dbPath.c_str()) < 0)
	{
		printf("Error, could not load %s file: %s\n", dbPath.c_str(), SDL_GetError());
	}

	const int nJoysticks = SDL_NumJoysticks();
	numGamepads = 0;

	// Cuenta el numero de mandos
	for (int i = 0; i < nJoysticks; ++i)
	{
		if (SDL_IsGameController(i))
		{
			numGamepads++;
		}
	}

	printf("\nChecking for game controllers...\n");
	printf("%i joysticks found, %i are gamepads\n", nJoysticks, numGamepads);

	if (numGamepads > 0)
	{
		found = true;

		for (int i = 0; i < numGamepads; i++)
		{
			// Abre el mando y lo añade a la lista
			SDL_GameController *pad = SDL_GameControllerOpen(i);
			if (SDL_GameControllerGetAttached(pad) == 1)
			{
				connectedControllers.push_back(pad);
				const std::string separator(" #");
				std::string name = SDL_GameControllerNameForIndex(i);
				name.resize(25);
				name = name + separator + std::to_string(i);
				std::cout << name << std::endl;
				controllerNames.push_back(name);
			}
			else
			{
				std::cout << "SDL_GetError() = " << SDL_GetError() << std::endl;
			}
		}

		SDL_GameControllerEventState(SDL_ENABLE);
	}

	return found;
}

// Comprueba si hay algun mando conectado
bool Input::gameControllerFound()
{
	if (numGamepads > 0)
	{
		return true;
	}
	else
	{
		return false;
	}
}

// Obten el nombre de un mando de juego
std::string Input::getControllerName(int index)
{
	if (numGamepads > 0)
	{
		return controllerNames.at(index);
	}
	else
	{
		return "";
	}
}

// Obten el numero de mandos conectados
int Input::getNumControllers()
{
	return numGamepads;
}