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JoystickImpl.cpp
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JoystickImpl.cpp
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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2017 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Window/JoystickImpl.hpp>
#include <SFML/System/Clock.hpp>
#include <SFML/System/Err.hpp>
#include <windows.h>
#include <tchar.h>
#include <regstr.h>
#include <algorithm>
#include <cmath>
#include <sstream>
#include <string>
namespace
{
struct ConnectionCache
{
ConnectionCache() : connected(false) {}
bool connected;
sf::Clock timer;
};
const sf::Time connectionRefreshDelay = sf::milliseconds(500);
ConnectionCache connectionCache[sf::Joystick::Count];
// If true, will only update when WM_DEVICECHANGE message is received
bool lazyUpdates = false;
// Get a system error string from an error code
std::string getErrorString(DWORD error)
{
PTCHAR buffer;
if (FormatMessage(FORMAT_MESSAGE_MAX_WIDTH_MASK | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, reinterpret_cast<PTCHAR>(&buffer), 0, NULL) == 0)
return "Unknown error.";
sf::String message = buffer;
LocalFree(buffer);
return message.toAnsiString();
}
// Get the joystick's name
sf::String getDeviceName(unsigned int index, JOYCAPS caps)
{
// Give the joystick a default name
sf::String joystickDescription = "Unknown Joystick";
LONG result;
HKEY rootKey;
HKEY currentKey;
std::basic_string<TCHAR> subkey;
subkey = REGSTR_PATH_JOYCONFIG;
subkey += TEXT('\\');
subkey += caps.szRegKey;
subkey += TEXT('\\');
subkey += REGSTR_KEY_JOYCURR;
rootKey = HKEY_CURRENT_USER;
result = RegOpenKeyEx(rootKey, subkey.c_str(), 0, KEY_READ, ¤tKey);
if (result != ERROR_SUCCESS)
{
rootKey = HKEY_LOCAL_MACHINE;
result = RegOpenKeyEx(rootKey, subkey.c_str(), 0, KEY_READ, ¤tKey);
if (result != ERROR_SUCCESS)
{
sf::err() << "Unable to open registry for joystick at index " << index << ": " << getErrorString(result) << std::endl;
return joystickDescription;
}
}
std::basic_ostringstream<TCHAR> indexString;
indexString << index + 1;
subkey = TEXT("Joystick");
subkey += indexString.str();
subkey += REGSTR_VAL_JOYOEMNAME;
TCHAR keyData[256];
DWORD keyDataSize = sizeof(keyData);
result = RegQueryValueEx(currentKey, subkey.c_str(), NULL, NULL, reinterpret_cast<LPBYTE>(keyData), &keyDataSize);
RegCloseKey(currentKey);
if (result != ERROR_SUCCESS)
{
sf::err() << "Unable to query registry key for joystick at index " << index << ": " << getErrorString(result) << std::endl;
return joystickDescription;
}
subkey = REGSTR_PATH_JOYOEM;
subkey += TEXT('\\');
subkey.append(keyData, keyDataSize / sizeof(TCHAR));
result = RegOpenKeyEx(rootKey, subkey.c_str(), 0, KEY_READ, ¤tKey);
if (result != ERROR_SUCCESS)
{
sf::err() << "Unable to open registry key for joystick at index " << index << ": " << getErrorString(result) << std::endl;
return joystickDescription;
}
keyDataSize = sizeof(keyData);
result = RegQueryValueEx(currentKey, REGSTR_VAL_JOYOEMNAME, NULL, NULL, reinterpret_cast<LPBYTE>(keyData), &keyDataSize);
RegCloseKey(currentKey);
if (result != ERROR_SUCCESS)
{
sf::err() << "Unable to query name for joystick at index " << index << ": " << getErrorString(result) << std::endl;
return joystickDescription;
}
keyData[255] = TEXT('\0'); // Ensure null terminator in case the data is too long.
joystickDescription = keyData;
return joystickDescription;
}
}
namespace sf
{
namespace priv
{
////////////////////////////////////////////////////////////
void JoystickImpl::initialize()
{
// Perform the initial scan and populate the connection cache
updateConnections();
}
////////////////////////////////////////////////////////////
void JoystickImpl::cleanup()
{
// Nothing to do
}
////////////////////////////////////////////////////////////
bool JoystickImpl::isConnected(unsigned int index)
{
ConnectionCache& cache = connectionCache[index];
if (!lazyUpdates && cache.timer.getElapsedTime() > connectionRefreshDelay)
{
JOYINFOEX joyInfo;
joyInfo.dwSize = sizeof(joyInfo);
joyInfo.dwFlags = 0;
cache.connected = joyGetPosEx(JOYSTICKID1 + index, &joyInfo) == JOYERR_NOERROR;
cache.timer.restart();
}
return cache.connected;
}
////////////////////////////////////////////////////////////
void JoystickImpl::setLazyUpdates(bool status)
{
lazyUpdates = status;
}
////////////////////////////////////////////////////////////
void JoystickImpl::updateConnections()
{
for (unsigned int i = 0; i < Joystick::Count; ++i)
{
JOYINFOEX joyInfo;
joyInfo.dwSize = sizeof(joyInfo);
joyInfo.dwFlags = 0;
ConnectionCache& cache = connectionCache[i];
cache.connected = joyGetPosEx(JOYSTICKID1 + i, &joyInfo) == JOYERR_NOERROR;
cache.timer.restart();
}
}
////////////////////////////////////////////////////////////
bool JoystickImpl::open(unsigned int index)
{
// No explicit "open" action is required
m_index = JOYSTICKID1 + index;
// Store the joystick capabilities
bool success = joyGetDevCaps(m_index, &m_caps, sizeof(m_caps)) == JOYERR_NOERROR;
if (success)
{
m_identification.name = getDeviceName(m_index, m_caps);
m_identification.productId = m_caps.wPid;
m_identification.vendorId = m_caps.wMid;
}
return success;
}
////////////////////////////////////////////////////////////
void JoystickImpl::close()
{
// Nothing to do
}
////////////////////////////////////////////////////////////
JoystickCaps JoystickImpl::getCapabilities() const
{
JoystickCaps caps;
caps.buttonCount = m_caps.wNumButtons;
if (caps.buttonCount > Joystick::ButtonCount)
caps.buttonCount = Joystick::ButtonCount;
caps.axes[Joystick::X] = true;
caps.axes[Joystick::Y] = true;
caps.axes[Joystick::Z] = (m_caps.wCaps & JOYCAPS_HASZ) != 0;
caps.axes[Joystick::R] = (m_caps.wCaps & JOYCAPS_HASR) != 0;
caps.axes[Joystick::U] = (m_caps.wCaps & JOYCAPS_HASU) != 0;
caps.axes[Joystick::V] = (m_caps.wCaps & JOYCAPS_HASV) != 0;
caps.axes[Joystick::PovX] = (m_caps.wCaps & JOYCAPS_HASPOV) != 0;
caps.axes[Joystick::PovY] = (m_caps.wCaps & JOYCAPS_HASPOV) != 0;
return caps;
}
////////////////////////////////////////////////////////////
Joystick::Identification JoystickImpl::getIdentification() const
{
return m_identification;
}
////////////////////////////////////////////////////////////
JoystickState JoystickImpl::update()
{
JoystickState state;
// Get the current joystick state
JOYINFOEX pos;
pos.dwFlags = JOY_RETURNX | JOY_RETURNY | JOY_RETURNZ | JOY_RETURNR | JOY_RETURNU | JOY_RETURNV | JOY_RETURNBUTTONS;
pos.dwFlags |= (m_caps.wCaps & JOYCAPS_POVCTS) ? JOY_RETURNPOVCTS : JOY_RETURNPOV;
pos.dwSize = sizeof(JOYINFOEX);
if (joyGetPosEx(m_index, &pos) == JOYERR_NOERROR)
{
// The joystick is connected
state.connected = true;
// Axes
state.axes[Joystick::X] = (pos.dwXpos - (m_caps.wXmax + m_caps.wXmin) / 2.f) * 200.f / (m_caps.wXmax - m_caps.wXmin);
state.axes[Joystick::Y] = (pos.dwYpos - (m_caps.wYmax + m_caps.wYmin) / 2.f) * 200.f / (m_caps.wYmax - m_caps.wYmin);
state.axes[Joystick::Z] = (pos.dwZpos - (m_caps.wZmax + m_caps.wZmin) / 2.f) * 200.f / (m_caps.wZmax - m_caps.wZmin);
state.axes[Joystick::R] = (pos.dwRpos - (m_caps.wRmax + m_caps.wRmin) / 2.f) * 200.f / (m_caps.wRmax - m_caps.wRmin);
state.axes[Joystick::U] = (pos.dwUpos - (m_caps.wUmax + m_caps.wUmin) / 2.f) * 200.f / (m_caps.wUmax - m_caps.wUmin);
state.axes[Joystick::V] = (pos.dwVpos - (m_caps.wVmax + m_caps.wVmin) / 2.f) * 200.f / (m_caps.wVmax - m_caps.wVmin);
// Special case for POV, it is given as an angle
if (pos.dwPOV != 0xFFFF)
{
float angle = pos.dwPOV / 18000.f * 3.141592654f;
state.axes[Joystick::PovX] = std::sin(angle) * 100;
state.axes[Joystick::PovY] = std::cos(angle) * 100;
}
else
{
state.axes[Joystick::PovX] = 0;
state.axes[Joystick::PovY] = 0;
}
// Buttons
for (unsigned int i = 0; i < Joystick::ButtonCount; ++i)
state.buttons[i] = (pos.dwButtons & (1 << i)) != 0;
}
return state;
}
} // namespace priv
} // namespace sf