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flightgear/3rdparty/joystick/jsWindows.cxx
James Turner dce282d7b8 Rename js.h -> FlightGear_js.h 
Ensure we don’t get weird conflicts as our internal version is
starting to diverge from the original PLIB one.
2020-06-11 17:48:49 +01:00

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/*
PLIB - A Suite of Portable Game Libraries
Copyright (C) 1998,2002 Steve Baker
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For further information visit http://plib.sourceforge.net
$Id: jsWindows.cxx 2164 2011-01-22 22:47:30Z fayjf $
*/
#include <string>
#include "FlightGear_js.h"
#include <Windows.h>
#include <cstring>
#include <RegStr.h> // for REGSTR_PATH_JOYCONFIG, etc
#include <simgear/debug/logstream.hxx>
#include <simgear/structure/exception.hxx>
#define _JS_MAX_AXES_WIN 8 /* X,Y,Z,R,U,V,POV_X,POV_Y */
struct os_specific_s {
JOYCAPS jsCaps ;
JOYINFOEX js ;
UINT js_id ;
static bool getOEMProductName ( jsJoystick* joy, char *buf, int buf_sz ) ;
};
// Give a human-readable interpretation of joyGetDevCaps()'s return value
static std::string joyGetDevCaps_errorString(MMRESULT errorCode)
{
switch (errorCode) {
case MMSYSERR_NODRIVER:
return "joystick driver not present, or specified joystick identifier is "
"invalid";
case MMSYSERR_INVALPARAM:
return "invalid parameter passed to joyGetDevCaps()";
// joyGetDevCaps() appears to return undocumented values, see
// https://sourceforge.net/p/flightgear/mailman/message/36657149/
case MMSYSERR_BADDEVICEID: // fallthrough
case JOYERR_PARMS:
return "invalid joystick identifier";
case JOYERR_UNPLUGGED:
return "joystick not connected to the system";
case JOYERR_NOERROR:
return "no error";
default:
// Don't throw an exception, since joyGetDevCaps()'s documentation isn't
// correct (we can't be sure to have covered all possible return values).
return "unexpected value passed to joyGetDevCaps_errorString(): "
+ std::to_string(errorCode);
}
throw sg_exception("This code path should be unreachable; value "
"passed to joyGetDevCaps_errorString(): "
+ std::to_string(errorCode));
}
// Inspired by
// http://msdn.microsoft.com/archive/en-us/dnargame/html/msdn_sidewind3d.asp
bool os_specific_s::getOEMProductName ( jsJoystick* joy, char *buf, int buf_sz )
{
if ( joy->error ) return false ;
union
{
char key [ 256 ] ;
char value [ 256 ] ;
} ;
char OEMKey [ 256 ] ;
HKEY hKey ;
DWORD dwcb ;
LONG lr ;
int hkcu = 0;
// Open .. MediaResources\CurrentJoystickSettings
sprintf ( key, "%s\\%s\\%s",
REGSTR_PATH_JOYCONFIG, joy->os->jsCaps.szRegKey,
REGSTR_KEY_JOYCURR ) ;
lr = RegOpenKeyEx ( HKEY_LOCAL_MACHINE, key, 0, KEY_QUERY_VALUE, &hKey) ;
if ( lr != ERROR_SUCCESS )
{
hkcu = 1;
// XP/Vista/7 seem to have moved it to "current user"
lr = RegOpenKeyEx ( HKEY_CURRENT_USER, key, 0, KEY_QUERY_VALUE, &hKey) ;
if ( lr != ERROR_SUCCESS ) return false ;
}
// Get OEM Key name
dwcb = sizeof(OEMKey) ;
// JOYSTICKID1-16 is zero-based; registry entries for VJOYD are 1-based.
sprintf ( value, "Joystick%d%s", joy->os->js_id + 1, REGSTR_VAL_JOYOEMNAME ) ;
lr = RegQueryValueEx ( hKey, value, 0, 0, (LPBYTE) OEMKey, &dwcb);
RegCloseKey ( hKey ) ;
if ( lr != ERROR_SUCCESS ) return false ;
// Open OEM Key from ...MediaProperties
sprintf ( key, "%s\\%s", REGSTR_PATH_JOYOEM, OEMKey ) ;
if (!hkcu)
lr = RegOpenKeyEx ( HKEY_LOCAL_MACHINE, key, 0, KEY_QUERY_VALUE, &hKey) ;
else
lr = RegOpenKeyEx ( HKEY_CURRENT_USER, key, 0, KEY_QUERY_VALUE, &hKey) ;
if ( lr != ERROR_SUCCESS )
{
return false ;
}
// Get OEM Name
dwcb = buf_sz ;
lr = RegQueryValueEx ( hKey, REGSTR_VAL_JOYOEMNAME, 0, 0, (LPBYTE) buf,
&dwcb ) ;
RegCloseKey ( hKey ) ;
if ( lr != ERROR_SUCCESS ) return false ;
return true ;
}
void jsJoystick::open ()
{
name [0] = '\0' ;
os->js . dwFlags = JOY_RETURNALL ;
os->js . dwSize = sizeof ( os->js ) ;
memset ( &(os->jsCaps), 0, sizeof(os->jsCaps) ) ;
const auto joyGetDevCaps_res = joyGetDevCaps(os->js_id, &(os->jsCaps),
sizeof(os->jsCaps));
error = (joyGetDevCaps_res != JOYERR_NOERROR);
if (error) {
SG_LOG(SG_INPUT, SG_DEBUG,
"joyGetDevCaps reported: "
<< joyGetDevCaps_errorString(joyGetDevCaps_res));
}
num_buttons = os->jsCaps.wNumButtons ;
if ( os->jsCaps.wNumAxes == 0 )
{
SG_LOG(SG_INPUT, SG_DEBUG,
"Joystick reported zero axes currently in use (JOYCAPS.wNumAxes)");
num_axes = 0 ;
setError () ;
}
else
{
// Device name from jsCaps is often "Microsoft PC-joystick driver",
// at least for USB. Try to get the real name from the registry.
if ( ! os->getOEMProductName ( this, name, sizeof(name) ) )
{
jsSetError ( SG_WARN,
"JS: Failed to read joystick name from registry" ) ;
strncpy ( name, os->jsCaps.szPname, sizeof(name) ) ;
}
// Windows joystick drivers may provide any combination of
// X,Y,Z,R,U,V,POV - not necessarily the first n of these.
if ( os->jsCaps.wCaps & JOYCAPS_HASPOV )
{
num_axes = _JS_MAX_AXES_WIN ;
min [ 7 ] = -1.0 ; max [ 7 ] = 1.0 ; // POV Y
min [ 6 ] = -1.0 ; max [ 6 ] = 1.0 ; // POV X
}
else
num_axes = 6 ;
min [ 5 ] = (float) os->jsCaps.wVmin ; max [ 5 ] = (float) os->jsCaps.wVmax ;
min [ 4 ] = (float) os->jsCaps.wUmin ; max [ 4 ] = (float) os->jsCaps.wUmax ;
min [ 3 ] = (float) os->jsCaps.wRmin ; max [ 3 ] = (float) os->jsCaps.wRmax ;
min [ 2 ] = (float) os->jsCaps.wZmin ; max [ 2 ] = (float) os->jsCaps.wZmax ;
min [ 1 ] = (float) os->jsCaps.wYmin ; max [ 1 ] = (float) os->jsCaps.wYmax ;
min [ 0 ] = (float) os->jsCaps.wXmin ; max [ 0 ] = (float) os->jsCaps.wXmax ;
}
for ( int i = 0 ; i < num_axes ; i++ )
{
center [ i ] = ( max[i] + min[i] ) / 2.0f ;
dead_band [ i ] = 0.0f ;
saturate [ i ] = 1.0f ;
}
}
void jsJoystick::close ()
{
delete os;
}
jsJoystick::jsJoystick ( int ident )
{
id = ident ;
os = new struct os_specific_s;
if (ident >= 0 && static_cast<unsigned int>(ident) < joyGetNumDevs()) {
os->js_id = JOYSTICKID1 + ident;
open();
}
else {
SG_LOG(SG_INPUT, SG_DEBUG,
"Joystick identifier not in the range of valid ids");
num_axes = 0;
setError();
}
}
void jsJoystick::rawRead ( int *buttons, float *axes )
{
if ( error )
{
if ( buttons )
*buttons = 0 ;
if ( axes )
for ( int i = 0 ; i < num_axes ; i++ )
axes[i] = 1500.0f ;
return ;
}
MMRESULT status = joyGetPosEx ( os->js_id, &(os->js) ) ;
if ( status != JOYERR_NOERROR )
{
setError() ;
return ;
}
if ( buttons != NULL )
*buttons = (int) os->js.dwButtons ;
if ( axes != NULL )
{
/* WARNING - Fall through case clauses!! */
switch ( num_axes )
{
case 8:
// Generate two POV axes from the POV hat angle.
// Low 16 bits of js.dwPOV gives heading (clockwise from ahead) in
// hundredths of a degree, or 0xFFFF when idle.
if ( ( os->js.dwPOV & 0xFFFF ) == 0xFFFF )
{
axes [ 6 ] = 0.0 ;
axes [ 7 ] = 0.0 ;
}
else
{
// This is the contentious bit: how to convert angle to X/Y.
// wk: I know of no define for PI that we could use here:
// SG_PI would pull in sg, M_PI is undefined for MSVC
// But the accuracy of the value of PI is very unimportant at
// this point.
float s = (float) sin ( ( os->js.dwPOV & 0xFFFF ) * ( 0.01 * 3.1415926535f / 180 ) ) ;
float c = (float) cos ( ( os->js.dwPOV & 0xFFFF ) * ( 0.01 * 3.1415926535f / 180 ) ) ;
// Convert to coordinates on a square so that North-East
// is (1,1) not (.7,.7), etc.
// s and c cannot both be zero so we won't divide by zero.
if ( fabs ( s ) < fabs ( c ) )
{
axes [ 6 ] = ( c < 0.0 ) ? -s/c : s/c ;
axes [ 7 ] = ( c < 0.0 ) ? -1.0f : 1.0f ;
}
else
{
axes [ 6 ] = ( s < 0.0 ) ? -1.0f : 1.0f ;
axes [ 7 ] = ( s < 0.0 ) ? -c/s : c/s ;
}
}
case 6: axes[5] = (float) os->js . dwVpos ;
case 5: axes[4] = (float) os->js . dwUpos ;
case 4: axes[3] = (float) os->js . dwRpos ;
case 3: axes[2] = (float) os->js . dwZpos ;
case 2: axes[1] = (float) os->js . dwYpos ;
case 1: axes[0] = (float) os->js . dwXpos ;
break;
default:
jsSetError ( SG_WARN, "PLIB_JS: Wrong num_axes. Joystick input is now invalid" ) ;
}
}
}
void jsInit() {}
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