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InputManager.cpp
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InputManager.cpp
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#include "InputManager.h"
#include "InputConfig.h"
#include "Settings.h"
#include "Window.h"
#include "Log.h"
#include "pugixml/pugixml.hpp"
#include <boost/filesystem.hpp>
#include "platform.h"
#define KEYBOARD_GUID_STRING "-1"
// SO HEY POTENTIAL POOR SAP WHO IS TRYING TO MAKE SENSE OF ALL THIS (by which I mean my future self)
// There are like four distinct IDs used for joysticks (crazy, right?)
// 1. Device index - this is the "lowest level" identifier, and is just the Nth joystick plugged in to the system (like /dev/js#).
// It can change even if the device is the same, and is only used to open joysticks (required to receive SDL events).
// 2. SDL_JoystickID - this is an ID for each joystick that is supposed to remain consistent between plugging and unplugging.
// ES doesn't care if it does, though.
// 3. "Device ID" - this is something I made up and is what InputConfig's getDeviceID() returns.
// This is actually just an SDL_JoystickID (also called instance ID), but -1 means "keyboard" instead of "error."
// 4. Joystick GUID - this is some squashed version of joystick vendor, version, and a bunch of other device-specific things.
// It should remain the same across runs of the program/system restarts/device reordering and is what I use to identify which joystick to load.
namespace fs = boost::filesystem;
InputManager* InputManager::mInstance = NULL;
InputManager::InputManager() : mKeyboardInputConfig(NULL)
{
}
InputManager::~InputManager()
{
deinit();
}
InputManager* InputManager::getInstance()
{
if(!mInstance)
mInstance = new InputManager();
return mInstance;
}
void InputManager::init()
{
if(initialized())
deinit();
SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
Settings::getInstance()->getBool("BackgroundJoystickInput") ? "1" : "0");
SDL_InitSubSystem(SDL_INIT_JOYSTICK);
SDL_JoystickEventState(SDL_ENABLE);
// first, open all currently present joysticks
int numJoysticks = SDL_NumJoysticks();
for(int i = 0; i < numJoysticks; i++)
{
addJoystickByDeviceIndex(i);
}
mKeyboardInputConfig = new InputConfig(DEVICE_KEYBOARD, "Keyboard", KEYBOARD_GUID_STRING);
loadInputConfig(mKeyboardInputConfig);
}
void InputManager::addJoystickByDeviceIndex(int id)
{
assert(id >= 0 && id < SDL_NumJoysticks());
// open joystick & add to our list
SDL_Joystick* joy = SDL_JoystickOpen(id);
assert(joy);
// add it to our list so we can close it again later
SDL_JoystickID joyId = SDL_JoystickInstanceID(joy);
mJoysticks[joyId] = joy;
char guid[65];
SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(joy), guid, 65);
// create the InputConfig
mInputConfigs[joyId] = new InputConfig(joyId, SDL_JoystickName(joy), guid);
if(!loadInputConfig(mInputConfigs[joyId]))
{
LOG(LogInfo) << "Added unconfigured joystick " << SDL_JoystickName(joy) << " (GUID: " << guid << ", instance ID: " << joyId << ", device index: " << id << ").";
}else{
LOG(LogInfo) << "Added known joystick " << SDL_JoystickName(joy) << " (instance ID: " << joyId << ", device index: " << id << ")";
}
// set up the prevAxisValues
int numAxes = SDL_JoystickNumAxes(joy);
mPrevAxisValues[joyId] = new int[numAxes];
std::fill(mPrevAxisValues[joyId], mPrevAxisValues[joyId] + numAxes, 0); //initialize array to 0
}
void InputManager::removeJoystickByJoystickID(SDL_JoystickID joyId)
{
assert(joyId != -1);
// delete old prevAxisValues
auto axisIt = mPrevAxisValues.find(joyId);
delete[] axisIt->second;
mPrevAxisValues.erase(axisIt);
// delete old InputConfig
auto it = mInputConfigs.find(joyId);
delete it->second;
mInputConfigs.erase(it);
// close the joystick
auto joyIt = mJoysticks.find(joyId);
if(joyIt != mJoysticks.end())
{
SDL_JoystickClose(joyIt->second);
mJoysticks.erase(joyIt);
}else{
LOG(LogError) << "Could not find joystick to close (instance ID: " << joyId << ")";
}
}
void InputManager::deinit()
{
if(!initialized())
return;
for(auto iter = mJoysticks.begin(); iter != mJoysticks.end(); iter++)
{
SDL_JoystickClose(iter->second);
}
mJoysticks.clear();
for(auto iter = mInputConfigs.begin(); iter != mInputConfigs.end(); iter++)
{
delete iter->second;
}
mInputConfigs.clear();
for(auto iter = mPrevAxisValues.begin(); iter != mPrevAxisValues.end(); iter++)
{
delete[] iter->second;
}
mPrevAxisValues.clear();
if(mKeyboardInputConfig != NULL)
{
delete mKeyboardInputConfig;
mKeyboardInputConfig = NULL;
}
SDL_JoystickEventState(SDL_DISABLE);
SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
}
int InputManager::getNumJoysticks() { return mJoysticks.size(); }
int InputManager::getButtonCountByDevice(SDL_JoystickID id)
{
if(id == DEVICE_KEYBOARD)
return 120; //it's a lot, okay.
else
return SDL_JoystickNumButtons(mJoysticks[id]);
}
InputConfig* InputManager::getInputConfigByDevice(int device)
{
if(device == DEVICE_KEYBOARD)
return mKeyboardInputConfig;
else
return mInputConfigs[device];
}
bool InputManager::parseEvent(const SDL_Event& ev, Window* window)
{
bool causedEvent = false;
switch(ev.type)
{
case SDL_JOYAXISMOTION:
//if it switched boundaries
if((abs(ev.jaxis.value) > DEADZONE) != (abs(mPrevAxisValues[ev.jaxis.which][ev.jaxis.axis]) > DEADZONE))
{
int normValue;
if(abs(ev.jaxis.value) <= DEADZONE)
normValue = 0;
else
if(ev.jaxis.value > 0)
normValue = 1;
else
normValue = -1;
window->input(getInputConfigByDevice(ev.jaxis.which), Input(ev.jaxis.which, TYPE_AXIS, ev.jaxis.axis, normValue, false));
causedEvent = true;
}
mPrevAxisValues[ev.jaxis.which][ev.jaxis.axis] = ev.jaxis.value;
return causedEvent;
case SDL_JOYBUTTONDOWN:
case SDL_JOYBUTTONUP:
window->input(getInputConfigByDevice(ev.jbutton.which), Input(ev.jbutton.which, TYPE_BUTTON, ev.jbutton.button, ev.jbutton.state == SDL_PRESSED, false));
return true;
case SDL_JOYHATMOTION:
window->input(getInputConfigByDevice(ev.jhat.which), Input(ev.jhat.which, TYPE_HAT, ev.jhat.hat, ev.jhat.value, false));
return true;
case SDL_KEYDOWN:
if(ev.key.keysym.sym == SDLK_BACKSPACE && SDL_IsTextInputActive())
{
window->textInput("\b");
}
if(ev.key.repeat)
return false;
if(ev.key.keysym.sym == SDLK_F4)
{
SDL_Event* quit = new SDL_Event();
quit->type = SDL_QUIT;
SDL_PushEvent(quit);
return false;
}
window->input(getInputConfigByDevice(DEVICE_KEYBOARD), Input(DEVICE_KEYBOARD, TYPE_KEY, ev.key.keysym.sym, 1, false));
return true;
case SDL_KEYUP:
window->input(getInputConfigByDevice(DEVICE_KEYBOARD), Input(DEVICE_KEYBOARD, TYPE_KEY, ev.key.keysym.sym, 0, false));
return true;
case SDL_TEXTINPUT:
window->textInput(ev.text.text);
break;
case SDL_JOYDEVICEADDED:
addJoystickByDeviceIndex(ev.jdevice.which); // ev.jdevice.which is a device index
return true;
case SDL_JOYDEVICEREMOVED:
removeJoystickByJoystickID(ev.jdevice.which); // ev.jdevice.which is an SDL_JoystickID (instance ID)
return false;
}
return false;
}
bool InputManager::loadInputConfig(InputConfig* config)
{
std::string path = getConfigPath();
if(!fs::exists(path))
return false;
pugi::xml_document doc;
pugi::xml_parse_result res = doc.load_file(path.c_str());
if(!res)
{
LOG(LogError) << "Error parsing input config: " << res.description();
return false;
}
pugi::xml_node root = doc.child("inputList");
if(!root)
return false;
pugi::xml_node configNode = root.find_child_by_attribute("inputConfig", "deviceGUID", config->getDeviceGUIDString().c_str());
if(!configNode)
configNode = root.find_child_by_attribute("inputConfig", "deviceName", config->getDeviceName().c_str());
if(!configNode)
return false;
config->loadFromXML(configNode);
return true;
}
//used in an "emergency" where no keyboard config could be loaded from the inputmanager config file
//allows the user to select to reconfigure in menus if this happens without having to delete es_input.cfg manually
void InputManager::loadDefaultKBConfig()
{
InputConfig* cfg = getInputConfigByDevice(DEVICE_KEYBOARD);
cfg->clear();
cfg->mapInput("up", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_UP, 1, true));
cfg->mapInput("down", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_DOWN, 1, true));
cfg->mapInput("left", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_LEFT, 1, true));
cfg->mapInput("right", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_RIGHT, 1, true));
cfg->mapInput("a", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_RETURN, 1, true));
cfg->mapInput("b", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_ESCAPE, 1, true));
cfg->mapInput("start", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_F1, 1, true));
cfg->mapInput("select", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_F2, 1, true));
cfg->mapInput("pageup", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_RIGHTBRACKET, 1, true));
cfg->mapInput("pagedown", Input(DEVICE_KEYBOARD, TYPE_KEY, SDLK_LEFTBRACKET, 1, true));
}
void InputManager::writeDeviceConfig(InputConfig* config)
{
assert(initialized());
std::string path = getConfigPath();
pugi::xml_document doc;
if(fs::exists(path))
{
// merge files
pugi::xml_parse_result result = doc.load_file(path.c_str());
if(!result)
{
LOG(LogError) << "Error parsing input config: " << result.description();
}else{
// successfully loaded, delete the old entry if it exists
pugi::xml_node root = doc.child("inputList");
if(root)
{
pugi::xml_node oldEntry = root.find_child_by_attribute("inputConfig", "deviceGUID", config->getDeviceGUIDString().c_str());
if(oldEntry)
root.remove_child(oldEntry);
oldEntry = root.find_child_by_attribute("inputConfig", "deviceName", config->getDeviceName().c_str());
if(oldEntry)
root.remove_child(oldEntry);
}
}
}
pugi::xml_node root = doc.child("inputList");
if(!root)
root = doc.append_child("inputList");
config->writeToXML(root);
doc.save_file(path.c_str());
}
std::string InputManager::getConfigPath()
{
std::string path = getHomePath();
path += "/.emulationstation/es_input.cfg";
return path;
}
bool InputManager::initialized() const
{
return mKeyboardInputConfig != NULL;
}
int InputManager::getNumConfiguredDevices()
{
int num = 0;
for(auto it = mInputConfigs.begin(); it != mInputConfigs.end(); it++)
{
if(it->second->isConfigured())
num++;
}
if(mKeyboardInputConfig->isConfigured())
num++;
return num;
}
std::string InputManager::getDeviceGUIDString(int deviceId)
{
if(deviceId == DEVICE_KEYBOARD)
return KEYBOARD_GUID_STRING;
auto it = mJoysticks.find(deviceId);
if(it == mJoysticks.end())
{
LOG(LogError) << "getDeviceGUIDString - deviceId " << deviceId << " not found!";
return "something went horribly wrong";
}
char guid[65];
SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(it->second), guid, 65);
return std::string(guid);
}