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Fixed bug 2950 - wrong axes values are set on joystick initialization 

Edward Rudd

Device: Logitech Rumble Gamepad F510 in Xinput mode.

Upon opening the joystick the values of the axes are queried via PollAllValues are not actually set on the device all the time.

This can easily be seen in the testjoystick or testgamecontroller test programs,as the testjoystick shows all axes in the center until one 'tickles' the triggers., and the testgamecontroller will show the triggers as 'on' until on 'tickles' the triggers.

Upon further research the culprit is the SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS hint. In the default value events are ignored until there is an active window, Thus in cases where the joystick system is initialized and controllers opened before the initial window is created & focuses, the initial values will be incorrect.

Here is my current workaround in the game I'm working on porting..

SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
SDL_GameController* gamepad = SDL_GameControllerOpen(index);
SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "0");
This commit is contained in:
Sam Lantinga 2017-08-12 17:41:59 -07:00
parent 7bab2913c2
commit 059d9e4627
3 changed files with 11 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/joystick/SDL_joystick.c
View File

@ -31,6 +31,7 @@
#if !SDL_EVENTS_DISABLED
#include "../events/SDL_events_c.h"
#endif
#include "../video/SDL_sysvideo.h"
static SDL_bool SDL_joystick_allows_background_events = SDL_FALSE;
@ -582,16 +583,10 @@ SDL_PrivateJoystickShouldIgnoreEvent()
return SDL_FALSE;
}
if (SDL_WasInit(SDL_INIT_VIDEO)) {
if (SDL_GetKeyboardFocus() == NULL) {
/* Video is initialized and we don't have focus, ignore the event. */
if (SDL_HasWindows() && SDL_GetKeyboardFocus() == NULL) {
/* We have windows but we don't have focus, ignore the event. */
return SDL_TRUE;
} else {
return SDL_FALSE;
}
}
/* Video subsystem wasn't initialized, always allow the event */
return SDL_FALSE;
}

1
src/video/SDL_sysvideo.h
View File

@ -403,6 +403,7 @@ extern void *SDL_GetDisplayDriverData( int displayIndex );
extern void SDL_GL_DeduceMaxSupportedESProfile(int* major, int* minor);
extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
extern SDL_bool SDL_HasWindows();
extern void SDL_OnWindowShown(SDL_Window * window);
extern void SDL_OnWindowHidden(SDL_Window * window);

6
src/video/SDL_video.c
View File

@ -1606,6 +1606,12 @@ SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
return 0;
}
SDL_bool
SDL_HasWindows()
{
return (_this && _this->windows != NULL);
}
Uint32
SDL_GetWindowID(SDL_Window * window)
{