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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 2007 Simon Howard
//
// 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, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
// SDL Joystick code.
//
//-----------------------------------------------------------------------------
#include "SDL.h"
#include "SDL_joystick.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "doomdef.h"
#include "doomtype.h"
#include "d_event.h"
#include "d_main.h"
#include "i_joystick.h"
// When an axis is within the dead zone, it is set to zero.
// This is 5% of the full range:
#define DEAD_ZONE (32768 / 20)
static SDL_Joystick *joystick = NULL;
// Configuration variables:
// Standard default.cfg Joystick enable/disable
extern int usejoystick;
// Joystick to use, as an SDL joystick index:
int joystick_index = -1;
// Which joystick axis to use for horizontal movement, and whether to
// invert the direction:
int joystick_x_axis = 0;
int joystick_x_invert = 0;
// Which joystick axis to use for vertical movement, and whether to
// invert the direction:
int joystick_y_axis = 1;
int joystick_y_invert = 0;
void I_InitJoystick(void)
{
int num_axes;
if (!usejoystick)
{
return;
}
if (SDL_Init(SDL_INIT_JOYSTICK) < 0)
{
return;
}
if (joystick_index < 0 || joystick_index >= SDL_NumJoysticks())
{
printf("I_InitJoystick: Invalid joystick ID: %i\n", joystick_index);
SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
return;
}
// Open the joystick
joystick = SDL_JoystickOpen(joystick_index);
if (joystick == NULL)
{
printf("I_InitJoystick: Failed to open joystick #%i\n",
joystick_index);
SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
return;
}
num_axes = SDL_JoystickNumAxes(joystick);
if (joystick_x_axis < 0 || joystick_x_axis >= num_axes
|| joystick_y_axis < 0 || joystick_y_axis >= num_axes)
{
printf("I_InitJoystick: Invalid joystick axis for joystick #%i "
"(run joystick setup again)\n",
joystick_index);
SDL_JoystickClose(joystick);
joystick = NULL;
SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
}
SDL_JoystickEventState(SDL_ENABLE);
// Initialised okay!
printf("I_InitJoystick: %s\n", SDL_JoystickName(joystick_index));
}
void I_ShutdownJoystick(void)
{
if (joystick != NULL)
{
SDL_JoystickClose(joystick);
joystick = NULL;
SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
}
}
// Get a bitmask of all currently-pressed buttons
static int GetButtonState(void)
{
int i;
int result;
result = 0;
for (i=0; i<SDL_JoystickNumButtons(joystick); ++i)
{
if (SDL_JoystickGetButton(joystick, i))
{
result |= 1 << i;
}
}
return result;
}
// Read the state of an axis, inverting if necessary.
static int GetAxisState(int axis, int invert)
{
int result;
result = SDL_JoystickGetAxis(joystick, axis);
if (invert)
{
result = -result;
}
if (result < DEAD_ZONE && result > -DEAD_ZONE)
{
result = 0;
}
return result;
}
void I_UpdateJoystick(void)
{
if (joystick != NULL)
{
event_t ev;
ev.type = ev_joystick;
ev.data1 = GetButtonState();
ev.data2 = GetAxisState(joystick_x_axis, joystick_x_invert);
ev.data3 = GetAxisState(joystick_y_axis, joystick_y_invert);
D_PostEvent(&ev);
}
}
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