372 lines
11 KiB
C
372 lines
11 KiB
C
//========================================================================
|
|
// GLFW - An OpenGL framework
|
|
// File: x11_joystick.c
|
|
// Platform: X11 (Unix)
|
|
// API version: 2.6
|
|
// WWW: http://glfw.sourceforge.net
|
|
//------------------------------------------------------------------------
|
|
// Copyright (c) 2002-2006 Camilla Berglund
|
|
//
|
|
// 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.
|
|
//
|
|
//========================================================================
|
|
|
|
#include "internal.h"
|
|
|
|
|
|
//========================================================================
|
|
// Note: Only Linux joystick input is supported at the moment. Other
|
|
// systems will behave as if there are no joysticks connected.
|
|
//========================================================================
|
|
|
|
#ifdef linux
|
|
#define _GLFW_USE_LINUX_JOYSTICKS
|
|
#endif // linux
|
|
|
|
|
|
|
|
//************************************************************************
|
|
//**** GLFW internal functions ****
|
|
//************************************************************************
|
|
|
|
#ifdef _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
//------------------------------------------------------------------------
|
|
// Here are the Linux joystick driver v1.x interface definitions that we
|
|
// use (we do not want to rely on <linux/joystick.h>):
|
|
//------------------------------------------------------------------------
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
|
|
// Joystick event types
|
|
#define JS_EVENT_BUTTON 0x01 /* button pressed/released */
|
|
#define JS_EVENT_AXIS 0x02 /* joystick moved */
|
|
#define JS_EVENT_INIT 0x80 /* initial state of device */
|
|
|
|
// Joystick event structure
|
|
struct js_event {
|
|
unsigned int time; /* (u32) event timestamp in milliseconds */
|
|
signed short value; /* (s16) value */
|
|
unsigned char type; /* (u8) event type */
|
|
unsigned char number; /* (u8) axis/button number */
|
|
};
|
|
|
|
// Joystick IOCTL commands
|
|
#define JSIOCGVERSION _IOR('j', 0x01, int) /* get driver version (u32) */
|
|
#define JSIOCGAXES _IOR('j', 0x11, char) /* get number of axes (u8) */
|
|
#define JSIOCGBUTTONS _IOR('j', 0x12, char) /* get number of buttons (u8) */
|
|
|
|
#endif // _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
|
|
//========================================================================
|
|
// _glfwInitJoysticks() - Initialize joystick interface
|
|
//========================================================================
|
|
|
|
void _glfwInitJoysticks( void )
|
|
{
|
|
#ifdef _GLFW_USE_LINUX_JOYSTICKS
|
|
int k, n, fd, joy_count;
|
|
char *joy_base_name, joy_dev_name[ 20 ];
|
|
int driver_version = 0x000800;
|
|
char ret_data;
|
|
#endif // _GLFW_USE_LINUX_JOYSTICKS
|
|
int i;
|
|
|
|
// Start by saying that there are no sticks
|
|
for( i = 0; i <= GLFW_JOYSTICK_LAST; ++ i )
|
|
{
|
|
_glfwJoy[ i ].Present = GL_FALSE;
|
|
}
|
|
|
|
#ifdef _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
// Try to open joysticks (nonblocking)
|
|
joy_count = 0;
|
|
for( k = 0; k <= 1 && joy_count <= GLFW_JOYSTICK_LAST; ++ k )
|
|
{
|
|
// Pick joystick base name
|
|
switch( k )
|
|
{
|
|
case 0:
|
|
joy_base_name = "/dev/input/js"; // USB sticks
|
|
break;
|
|
case 1:
|
|
joy_base_name = "/dev/js"; // "Legacy" sticks
|
|
break;
|
|
default:
|
|
continue; // (should never happen)
|
|
}
|
|
|
|
// Try to open a few of these sticks
|
|
for( i = 0; i <= 50 && joy_count <= GLFW_JOYSTICK_LAST; ++ i )
|
|
{
|
|
sprintf( joy_dev_name, "%s%d", joy_base_name, i );
|
|
fd = open( joy_dev_name, O_NONBLOCK );
|
|
if( fd != -1 )
|
|
{
|
|
// Remember fd
|
|
_glfwJoy[ joy_count ].fd = fd;
|
|
|
|
// Check that the joystick driver version is 1.0+
|
|
ioctl( fd, JSIOCGVERSION, &driver_version );
|
|
if( driver_version < 0x010000 )
|
|
{
|
|
// It's an old 0.x interface (we don't support it)
|
|
close( fd );
|
|
continue;
|
|
}
|
|
|
|
// Get number of joystick axes
|
|
ioctl( fd, JSIOCGAXES, &ret_data );
|
|
_glfwJoy[ joy_count ].NumAxes = (int) ret_data;
|
|
|
|
// Get number of joystick buttons
|
|
ioctl( fd, JSIOCGBUTTONS, &ret_data );
|
|
_glfwJoy[ joy_count ].NumButtons = (int) ret_data;
|
|
|
|
// Allocate memory for joystick state
|
|
_glfwJoy[ joy_count ].Axis =
|
|
(float *) malloc( sizeof(float) *
|
|
_glfwJoy[ joy_count ].NumAxes );
|
|
if( _glfwJoy[ joy_count ].Axis == NULL )
|
|
{
|
|
close( fd );
|
|
continue;
|
|
}
|
|
_glfwJoy[ joy_count ].Button =
|
|
(char *) malloc( sizeof(char) *
|
|
_glfwJoy[ joy_count ].NumButtons );
|
|
if( _glfwJoy[ joy_count ].Button == NULL )
|
|
{
|
|
free( _glfwJoy[ joy_count ].Axis );
|
|
close( fd );
|
|
continue;
|
|
}
|
|
|
|
// Clear joystick state
|
|
for( n = 0; n < _glfwJoy[ joy_count ].NumAxes; ++ n )
|
|
{
|
|
_glfwJoy[ joy_count ].Axis[ n ] = 0.0f;
|
|
}
|
|
for( n = 0; n < _glfwJoy[ joy_count ].NumButtons; ++ n )
|
|
{
|
|
_glfwJoy[ joy_count ].Button[ n ] = GLFW_RELEASE;
|
|
}
|
|
|
|
// The joystick is supported and connected
|
|
_glfwJoy[ joy_count ].Present = GL_TRUE;
|
|
joy_count ++;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif // _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// _glfwTerminateJoysticks() - Close all opened joystick handles
|
|
//========================================================================
|
|
|
|
void _glfwTerminateJoysticks( void )
|
|
{
|
|
|
|
#ifdef _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
int i;
|
|
|
|
// Close any opened joysticks
|
|
for( i = 0; i <= GLFW_JOYSTICK_LAST; ++ i )
|
|
{
|
|
if( _glfwJoy[ i ].Present )
|
|
{
|
|
close( _glfwJoy[ i ].fd );
|
|
free( _glfwJoy[ i ].Axis );
|
|
free( _glfwJoy[ i ].Button );
|
|
_glfwJoy[ i ].Present = GL_FALSE;
|
|
}
|
|
}
|
|
|
|
#endif // _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// _glfwPollJoystickEvents() - Empty joystick event queue
|
|
//========================================================================
|
|
|
|
static void _glfwPollJoystickEvents( void )
|
|
{
|
|
|
|
#ifdef _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
struct js_event e;
|
|
int i;
|
|
|
|
// Get joystick events for all GLFW joysticks
|
|
for( i = 0; i <= GLFW_JOYSTICK_LAST; ++ i )
|
|
{
|
|
// Is the stick present?
|
|
if( _glfwJoy[ i ].Present )
|
|
{
|
|
// Read all queued events (non-blocking)
|
|
while( read(_glfwJoy[i].fd, &e, sizeof(struct js_event)) > 0 )
|
|
{
|
|
// We don't care if it's an init event or not
|
|
e.type &= ~JS_EVENT_INIT;
|
|
|
|
// Check event type
|
|
switch( e.type )
|
|
{
|
|
case JS_EVENT_AXIS:
|
|
_glfwJoy[ i ].Axis[ e.number ] = (float) e.value /
|
|
32767.0f;
|
|
// We need to change the sign for the Y axes, so that
|
|
// positive = up/forward, according to the GLFW spec.
|
|
if( e.number & 1 )
|
|
{
|
|
_glfwJoy[ i ].Axis[ e.number ] =
|
|
-_glfwJoy[ i ].Axis[ e.number ];
|
|
}
|
|
break;
|
|
|
|
case JS_EVENT_BUTTON:
|
|
_glfwJoy[ i ].Button[ e.number ] =
|
|
e.value ? GLFW_PRESS : GLFW_RELEASE;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif // _GLFW_USE_LINUX_JOYSTICKS
|
|
|
|
}
|
|
|
|
|
|
//************************************************************************
|
|
//**** Platform implementation functions ****
|
|
//************************************************************************
|
|
|
|
//========================================================================
|
|
// _glfwPlatformGetJoystickParam() - Determine joystick capabilities
|
|
//========================================================================
|
|
|
|
int _glfwPlatformGetJoystickParam( int joy, int param )
|
|
{
|
|
// Is joystick present?
|
|
if( !_glfwJoy[ joy ].Present )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
switch( param )
|
|
{
|
|
case GLFW_PRESENT:
|
|
return GL_TRUE;
|
|
|
|
case GLFW_AXES:
|
|
return _glfwJoy[ joy ].NumAxes;
|
|
|
|
case GLFW_BUTTONS:
|
|
return _glfwJoy[ joy ].NumButtons;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// _glfwPlatformGetJoystickPos() - Get joystick axis positions
|
|
//========================================================================
|
|
|
|
int _glfwPlatformGetJoystickPos( int joy, float *pos, int numaxes )
|
|
{
|
|
int i;
|
|
|
|
// Is joystick present?
|
|
if( !_glfwJoy[ joy ].Present )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
// Update joystick state
|
|
_glfwPollJoystickEvents();
|
|
|
|
// Does the joystick support less axes than requested?
|
|
if( _glfwJoy[ joy ].NumAxes < numaxes )
|
|
{
|
|
numaxes = _glfwJoy[ joy ].NumAxes;
|
|
}
|
|
|
|
// Copy axis positions from internal state
|
|
for( i = 0; i < numaxes; ++ i )
|
|
{
|
|
pos[ i ] = _glfwJoy[ joy ].Axis[ i ];
|
|
}
|
|
|
|
return numaxes;
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// _glfwPlatformGetJoystickButtons() - Get joystick button states
|
|
//========================================================================
|
|
|
|
int _glfwPlatformGetJoystickButtons( int joy, unsigned char *buttons,
|
|
int numbuttons )
|
|
{
|
|
int i;
|
|
|
|
// Is joystick present?
|
|
if( !_glfwJoy[ joy ].Present )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
// Update joystick state
|
|
_glfwPollJoystickEvents();
|
|
|
|
// Does the joystick support less buttons than requested?
|
|
if( _glfwJoy[ joy ].NumButtons < numbuttons )
|
|
{
|
|
numbuttons = _glfwJoy[ joy ].NumButtons;
|
|
}
|
|
|
|
// Copy button states from internal state
|
|
for( i = 0; i < numbuttons; ++ i )
|
|
{
|
|
buttons[ i ] = _glfwJoy[ joy ].Button[ i ];
|
|
}
|
|
|
|
return numbuttons;
|
|
}
|