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/* Copyright (C) 2014 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. 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.
*
* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "Joystick.h"
#include "lib/external_libraries/libsdl.h"
#include "ps/CLogger.h"
#include "ps/ConfigDB.h"
CJoystick g_Joystick;
CJoystick::CJoystick() :
m_Joystick(NULL), m_Deadzone(0)
{
}
void CJoystick::Initialise()
{
bool joystickEnable = false;
CFG_GET_VAL("joystick.enable", joystickEnable);
if (!joystickEnable)
return;
CFG_GET_VAL("joystick.deadzone", m_Deadzone);
if (SDL_InitSubSystem(SDL_INIT_JOYSTICK) < 0)
{
LOGERROR("CJoystick::Initialise failed to initialise joysticks (\"%s\")", SDL_GetError());
return;
}
int numJoysticks = SDL_NumJoysticks();
LOGMESSAGE("Found %d joystick(s)", numJoysticks);
for (int i = 0; i < numJoysticks; ++i)
{
SDL_Joystick* stick = SDL_JoystickOpen(i);
if (!stick)
{
LOGERROR("CJoystick::Initialise failed to open joystick %d (\"%s\")", i, SDL_GetError());
continue;
}
const char* name = SDL_JoystickName(stick);
LOGMESSAGE("Joystick %d: %s", i, name);
SDL_JoystickClose(stick);
}
if (numJoysticks)
{
SDL_JoystickEventState(SDL_ENABLE);
// Always pick the first joystick, and assume that's the right one
m_Joystick = SDL_JoystickOpen(0);
if (!m_Joystick)
LOGERROR("CJoystick::Initialise failed to open joystick (\"%s\")", SDL_GetError());
}
}
bool CJoystick::IsEnabled()
{
return (m_Joystick != NULL);
}
float CJoystick::GetAxisValue(int axis)
{
if (!m_Joystick || axis < 0 || axis >= SDL_JoystickNumAxes(m_Joystick))
return 0.f;
int16_t val = SDL_JoystickGetAxis(m_Joystick, axis);
// Normalize values into the range [-1, +1] excluding the deadzone around 0
float norm;
if (val > m_Deadzone)
norm = (val - m_Deadzone) / (float)(32767 - m_Deadzone);
else if (val < -m_Deadzone)
norm = (val + m_Deadzone) / (float)(32767 - m_Deadzone);
else
norm = 0.f;
return norm;
}
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