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Fixed bug 2090 - Some joystick inputs are delayed on FreeBSD

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kikuchan

Some joysticks with high sampling rate need to be read() more fast,
otherwise it delay user inputs due to internal queue.
Especially, an app that issues SDL_PollEvent() not so frequent
This commit is contained in:
Sam Lantinga 2013-09-06 20:54:14 -07:00
parent 10ffa28a28
commit dc9ddf1f61
1 changed files with 80 additions and 84 deletions
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16
src/joystick/bsd/SDL_sysjoystick.c
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@ -446,9 +446,7 @@ SDL_SYS_JoystickUpdate(SDL_Joystick * joy)
static int x, y, xmin = 0xffff, ymin = 0xffff, xmax = 0, ymax = 0; static int x, y, xmin = 0xffff, ymin = 0xffff, xmax = 0, ymax = 0;
if (joy->hwdata->type == BSDJOY_JOY) { if (joy->hwdata->type == BSDJOY_JOY) {
if (read(joy->hwdata->fd, &gameport, sizeof gameport) != while (read(joy->hwdata->fd, &gameport, sizeof gameport) == sizeof gameport) {
sizeof gameport)
return;
if (abs(x - gameport.x) > 8) { if (abs(x - gameport.x) > 8) {
x = gameport.x; x = gameport.x;
if (x < xmin) { if (x < xmin) {
@ -489,23 +487,22 @@ SDL_SYS_JoystickUpdate(SDL_Joystick * joy)
if (gameport.b2 != joy->buttons[1]) { if (gameport.b2 != joy->buttons[1]) {
SDL_PrivateJoystickButton(joy, 1, gameport.b2); SDL_PrivateJoystickButton(joy, 1, gameport.b2);
} }
}
return; return;
} }
#endif /* defined(__FREEBSD__) || SDL_JOYSTICK_USBHID_MACHINE_JOYSTICK_H */ #endif /* defined(__FREEBSD__) || SDL_JOYSTICK_USBHID_MACHINE_JOYSTICK_H */
rep = &joy->hwdata->inreport; rep = &joy->hwdata->inreport;
if (read(joy->hwdata->fd, REP_BUF_DATA(rep), rep->size) != rep->size) { while (read(joy->hwdata->fd, REP_BUF_DATA(rep), rep->size) == rep->size) {
return;
}
#if defined(USBHID_NEW) || (defined(__FREEBSD__) && __FreeBSD_kernel_version >= 500111) || defined(__FreeBSD_kernel__) #if defined(USBHID_NEW) || (defined(__FREEBSD__) && __FreeBSD_kernel_version >= 500111) || defined(__FreeBSD_kernel__)
hdata = hid_start_parse(joy->hwdata->repdesc, 1 << hid_input, rep->rid); hdata = hid_start_parse(joy->hwdata->repdesc, 1 << hid_input, rep->rid);
#else #else
hdata = hid_start_parse(joy->hwdata->repdesc, 1 << hid_input); hdata = hid_start_parse(joy->hwdata->repdesc, 1 << hid_input);
#endif #endif
if (hdata == NULL) { if (hdata == NULL) {
fprintf(stderr, "%s: Cannot start HID parser\n", joy->hwdata->path); /*fprintf(stderr, "%s: Cannot start HID parser\n", joy->hwdata->path);*/
return; continue;
} }
for (nbutton = 0; hid_get_item(hdata, &hitem) > 0;) { for (nbutton = 0; hid_get_item(hdata, &hitem) > 0;) {
@ -552,8 +549,7 @@ SDL_SYS_JoystickUpdate(SDL_Joystick * joy)
} }
} }
hid_end_parse(hdata); hid_end_parse(hdata);
}
return;
} }
/* Function to close a joystick after use */ /* Function to close a joystick after use */