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Handle unstable device index when hotplugging controller

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This commit is contained in:
mazmazz 2018-12-13 23:09:05 -05:00
parent bcd747c1cd
commit e81f05c496
1 changed files with 67 additions and 5 deletions
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72
src/sdl/i_system.c
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@ -1021,6 +1021,7 @@ void I_GetJoystickEvents(void)
*/
static int joy_open(const char *fname)
{
SDL_Joystick *newdev = NULL;
int joyindex = atoi(fname);
int num_joy = 0;
int i;
@ -1062,7 +1063,28 @@ static int joy_open(const char *fname)
}
}
JoyInfo.dev = SDL_JoystickOpen(joyindex-1);
newdev = SDL_JoystickOpen(joyindex-1);
// Handle the edge case where the device <-> joystick index assignment can change due to hotplugging
// This indexing is SDL's responsibility and there's not much we can do about it.
//
// Example:
// 1. Plug Controller A -> Index 0 opened
// 2. Plug Controller B -> Index 1 opened
// 3. Unplug Controller A -> Index 0 closed, Index 1 active
// 4. Unplug Controller B -> Index 0 inactive, Index 1 closed
// 5. Plug Controller B -> Index 0 opened
// 6. Plug Controller A -> Index 0 REPLACED, opened as Controller A; Index 1 is now Controller B
if (JoyInfo.dev)
{
if (JoyInfo.dev == newdev // same device, nothing to do
|| (newdev == NULL && SDL_JoystickGetAttached(JoyInfo.dev))) // we failed, but already have a working device
return JoyInfo.axises;
// Else, we're changing devices, so send neutral joy events
I_ShutdownJoystick();
}
JoyInfo.dev = newdev;
if (JoyInfo.dev == NULL)
{
@ -1075,7 +1097,7 @@ static int joy_open(const char *fname)
JoyInfo.axises = SDL_JoystickNumAxes(JoyInfo.dev);
if (JoyInfo.axises > JOYAXISSET*2)
JoyInfo.axises = JOYAXISSET*2;
/* if (joyaxes<2)
/* if (joyaxes<2)
{
I_OutputMsg("Not enought axes?\n");
return 0;
@ -1292,6 +1314,7 @@ void I_GetJoystick2Events(void)
*/
static int joy_open2(const char *fname)
{
SDL_Joystick *newdev = NULL;
int joyindex = atoi(fname);
int num_joy = 0;
int i;
@ -1333,7 +1356,28 @@ static int joy_open2(const char *fname)
}
}
JoyInfo2.dev = SDL_JoystickOpen(joyindex-1);
newdev = SDL_JoystickOpen(joyindex-1);
// Handle the edge case where the device <-> joystick index assignment can change due to hotplugging
// This indexing is SDL's responsibility and there's not much we can do about it.
//
// Example:
// 1. Plug Controller A -> Index 0 opened
// 2. Plug Controller B -> Index 1 opened
// 3. Unplug Controller A -> Index 0 closed, Index 1 active
// 4. Unplug Controller B -> Index 0 inactive, Index 1 closed
// 5. Plug Controller B -> Index 0 opened
// 6. Plug Controller A -> Index 0 REPLACED, opened as Controller A; Index 1 is now Controller B
if (JoyInfo2.dev)
{
if (JoyInfo2.dev == newdev // same device, nothing to do
|| (newdev == NULL && SDL_JoystickGetAttached(JoyInfo2.dev))) // we failed, but already have a working device
return JoyInfo.axises;
// Else, we're changing devices, so send neutral joy events
I_ShutdownJoystick2();
}
JoyInfo2.dev = newdev;
if (JoyInfo2.dev == NULL)
{
@ -1390,7 +1434,16 @@ void I_InitJoystick(void)
if (strcmp(cv_usejoystick.string, "0") && joy_open(cv_usejoystick.string) != -1)
{
JoyInfo.oldjoy = atoi(cv_usejoystick.string);
// JoyInfo.oldjoy may already be filled because we attempted to hotplug
// a device and the device index has changed
// So in this case, get the new device index
//
// For now, it does not actually matter if the JoyInfo.oldjoy value is inaccurate. We don't use its
// exact value; we just use it like a boolean.
if (JoyInfo.oldjoy <= 0)
JoyInfo.oldjoy = atoi(cv_usejoystick.string);
else
JoyInfo.oldjoy = SDL_JoystickInstanceID(JoyInfo.dev) + 1;
joystick_started = 1;
}
else
@ -1421,7 +1474,16 @@ void I_InitJoystick2(void)
if (strcmp(cv_usejoystick2.string, "0") && joy_open2(cv_usejoystick2.string) != -1)
{
JoyInfo2.oldjoy = atoi(cv_usejoystick2.string);
// JoyInfo.oldjoy may already be filled because we attempted to hotplug
// a device and the device index has changed
// So in this case, get the new device index
//
// For now, it does not actually matter if the JoyInfo2.oldjoy value is inaccurate. We don't use its
// exact value; we just use it like a boolean.
if (JoyInfo2.oldjoy <= 0)
JoyInfo2.oldjoy = atoi(cv_usejoystick2.string);
else
JoyInfo2.oldjoy = SDL_JoystickInstanceID(JoyInfo2.dev) + 1;
joystick2_started = 1;
}
else