blame: source/code/gamecontroller.cpp

/*

===========================================================================

blockattack - Block Attack - Rise of the Blocks

Copyright (C) 2005-2016 Poul Sander

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program.  If not, see http://www.gnu.org/licenses/

Source information and contacts persons can be found at

http://www.blockattack.net

===========================================================================

*/

#include "gamecontroller.h"

#include "SDL_gamecontroller.h"

#include "sago/platform_folders.h"

#include "common.h"

#include <iostream>

#include <map>

#include <SDL2/SDL_joystick.h>

static bool verbose = false;

struct ControllerStatus {

	std::map<int, bool> AxisInDeadZone;

	int player = 1;

};

static std::map<SDL_JoystickID, ControllerStatus> controllerStatusMap;

static std::map<std::string, int> gamecontrollers_assigned;

static std::vector<std::string> supportedControllers;

static std::vector<SDL_GameController*> controllersOpened;

void GameControllerSetVerbose(bool value) {

	verbose = value;

}

static const char* GameControllerGetName(SDL_GameController* gamecontroller) {

	const char* result = SDL_GameControllerName(gamecontroller);

	if (!result) {

		result = "Unnamed";

	}

	return result;

}

static std::string GetGuidAsHex(const SDL_JoystickGUID& guid) {

	std::string ret;

	char buffer[3];

	for (size_t j = 0; j < 16; j++) {

		snprintf(buffer, sizeof(buffer), "%02X", guid.data[j]);

		ret += buffer;

	}

	return ret;

}

static int GetNextPlayerByGui(const SDL_JoystickGUID& guid) {

	Config::getInstance()->setDefault("gc_AllToOnePlayer", "0");

	int fixedPlayer = Config::getInstance()->getInt("gc_AllToOnePlayer");

	if (fixedPlayer > 0 && fixedPlayer <= 2) {

		return fixedPlayer;

	}

	std::string guidAsHex= GetGuidAsHex(guid);

	std::string configName = "gc_assign_"+guidAsHex;

	Config::getInstance()->setDefault(configName, "1");

	int player = Config::getInstance()->getInt(configName) + gamecontrollers_assigned[guidAsHex];

	gamecontrollers_assigned[guidAsHex]++; //Next controller with same guid should be assigned to different player.

	if (player%2==0) {

		return 2;  //Even number means player 2

	}

	return 1;

}

void UnInitGameControllers() {

	if (controllersOpened.empty()) {

		return;

	}

	for (SDL_GameController* t : controllersOpened) {

		SDL_GameControllerClose(t);

	}

	controllersOpened.clear();

	controllerStatusMap.clear();

	gamecontrollers_assigned.clear();

	supportedControllers.clear();

}

void InitGameControllers() {

	std::string configFile = sago::getConfigHome()+"/blockattack/gamecontrollerdb.txt";

	int errorCode = SDL_GameControllerAddMappingsFromFile(configFile.c_str());

	if (errorCode == -1 && verbose) {

		std::cerr << "Could not load mapping file: " << configFile << "\n";

	}

	if (verbose) {

		std::cout << "Number of Game controllers: " << SDL_NumJoysticks() << "\n";

	}

	SDL_GameController* controller = nullptr;

	for (int i = 0; i < SDL_NumJoysticks(); ++i) {

		if (SDL_IsGameController(i)) {

			controller = SDL_GameControllerOpen(i);

			SDL_Joystick* j = SDL_GameControllerGetJoystick(controller);

			SDL_JoystickID instanceId = SDL_JoystickInstanceID(j);

			SDL_JoystickGUID guid = SDL_JoystickGetGUID(j);

			int assingToPlayer = GetNextPlayerByGui(guid);

			controllerStatusMap[instanceId].player = assingToPlayer;

			supportedControllers.push_back(GameControllerGetName(controller));

			controllersOpened.push_back(controller);

			if (verbose) {

				std::cout << "Supported game controller detected: " << GameControllerGetName(controller) << ", mapping: " << SDL_GameControllerMapping(controller) <<  "\n";

				std::cout << "Assigned to player: " << controllerStatusMap[instanceId].player << "\n";

			}

		}

	}

}

const std::vector<std::string>& GetSupportedControllerNames() {

	return supportedControllers;

}

void checkDeadZone(const SDL_Event& event) {

	if (event.type != SDL_CONTROLLERAXISMOTION) {

		return;  //assert?

	}

	int value = event.caxis.value;

	if (value > -deadZoneLimit && value < deadZoneLimit) {

		controllerStatusMap[event.caxis.which].AxisInDeadZone[event.caxis.axis] = true;

	}

}

bool getDeadZone(SDL_JoystickID id, int axis) {

	return controllerStatusMap[id].AxisInDeadZone[axis];

}

void setDeadZone(SDL_JoystickID id, int axis, bool value) {

	controllerStatusMap[id].AxisInDeadZone[axis] = value;

}

static bool skipThisPlayer(int playerNumber, const SDL_Event& event) {

	if (event.type == SDL_CONTROLLERBUTTONDOWN) {

		ControllerStatus& cs = controllerStatusMap[event.cbutton.which];

		if (cs.player == playerNumber) {

			return false;

		}

	}

	if (event.type == SDL_CONTROLLERAXISMOTION ) {

		ControllerStatus& cs = controllerStatusMap[event.caxis.which];

		if (cs.player == playerNumber) {

			return false;

		}

	}

	return true;

}

bool isGameControllerConnectionEvent(const SDL_Event& event) {

	if ( event.type == SDL_CONTROLLERDEVICEADDED

	        || event.type == SDL_CONTROLLERDEVICEREMOVED

	        || event.type == SDL_CONTROLLERDEVICEREMAPPED ) {

		return true;

	}

	return false;

}

bool isPlayerDownEvent(int playerNumber, const SDL_Event& event) {

	if (skipThisPlayer(playerNumber, event)) {

		return false;

	}

	return isControllerDownEvent(event);

}

bool isControllerDirectionEvent(const SDL_Event& event, SDL_GameControllerButton dpad_direction, SDL_GameControllerAxis axis, float axis_mod = 1.0f) {

	if (event.type == SDL_CONTROLLERBUTTONDOWN) {

		if (event.cbutton.button == dpad_direction ) {

			return true;

		}

	}

	if (event.type == SDL_CONTROLLERAXISMOTION  && event.caxis.axis == axis ) {

		const SDL_ControllerAxisEvent& a = event.caxis;

		checkDeadZone(event);

		if (getDeadZone(a.which, a.axis)) {

			if (event.caxis.value * axis_mod > deadZoneLimit) {

				setDeadZone(a.which,a.axis,false);

				return true;

			}

		}

	}

	return false;

}

bool isControllerDownEvent(const SDL_Event& event) {

	return isControllerDirectionEvent(event, SDL_CONTROLLER_BUTTON_DPAD_DOWN, SDL_CONTROLLER_AXIS_LEFTY);

}

bool isControllerUpEvent(const SDL_Event& event) {

	return isControllerDirectionEvent(event, SDL_CONTROLLER_BUTTON_DPAD_UP, SDL_CONTROLLER_AXIS_LEFTY, -1.0f);

}

bool isControllerLeftEvent(const SDL_Event& event) {

	return isControllerDirectionEvent(event, SDL_CONTROLLER_BUTTON_DPAD_LEFT, SDL_CONTROLLER_AXIS_LEFTX, -1.0f);

}

bool isControllerRightEvent(const SDL_Event& event) {

	return isControllerDirectionEvent(event, SDL_CONTROLLER_BUTTON_DPAD_LEFT, SDL_CONTROLLER_AXIS_LEFTX);

}

bool isPlayerUpEvent(int playerNumber, const SDL_Event& event) {

	if (skipThisPlayer(playerNumber, event)) {

		return false;

	}

	return isControllerUpEvent(event);

}

bool isPlayerLeftEvent(int playerNumber, const SDL_Event& event) {

	if (skipThisPlayer(playerNumber, event)) {

		return false;

	}

	return isControllerLeftEvent(event);

}

bool isPlayerRightEvent(int playerNumber, const SDL_Event& event) {

	if (skipThisPlayer(playerNumber, event)) {

		return false;

	}

	return isControllerRightEvent(event);

}

bool isPlayerSwitchEvent(int playerNumber, const SDL_Event& event) {

	if (skipThisPlayer(playerNumber, event)) {

		return false;

	}

	if (event.type == SDL_CONTROLLERBUTTONDOWN) {

		if (event.cbutton.button == SDL_CONTROLLER_BUTTON_A || event.cbutton.button == SDL_CONTROLLER_BUTTON_B ) {

			return true;

		}

	}

	return false;

}

bool isPlayerPushEvent(int playerNumber, const SDL_Event& event) {

	if (skipThisPlayer(playerNumber, event)) {

		return false;

	}

	if (event.type == SDL_CONTROLLERBUTTONDOWN) {

		if (event.cbutton.button == SDL_CONTROLLER_BUTTON_LEFTSHOULDER || event.cbutton.button == SDL_CONTROLLER_BUTTON_RIGHTSHOULDER ) {

			return true;

		}

	}

	if (event.type == SDL_CONTROLLERAXISMOTION  && (event.caxis.axis == SDL_CONTROLLER_AXIS_TRIGGERLEFT || event.caxis.axis == SDL_CONTROLLER_AXIS_TRIGGERRIGHT ) ) {

		checkDeadZone(event);

		const SDL_ControllerAxisEvent& a = event.caxis;

		if (getDeadZone(a.which, a.axis)) {

			if (event.caxis.value > deadZoneLimit) {

				setDeadZone(a.which,a.axis,false);

				return true;

			}

		}

	}

	return false;

}