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Fix Linux haptic scaling, add 2.1 FIXME

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This commit is contained in:
Ethan Lee 2018-05-04 21:58:39 -04:00
parent de9f5415b3
commit 0a7faa4ae5
2 changed files with 16 additions and 4 deletions
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11
include/SDL_haptic.h
View File

@ -117,6 +117,17 @@
extern "C" {
#endif /* __cplusplus */
/* FIXME: For SDL 2.1, adjust all the magnitude variables to be Uint16 (0xFFFF).
*
* At the moment the magnitude variables are mixed between signed/unsigned, and
* it is also not made clear that ALL of those variables expect a max of 0x7FFF.
*
* Some platforms may have higher precision than that (Linux FF, Windows XInput)
* so we should fix the inconsistency in favor of higher possible precision,
* adjusting for platforms that use different scales.
* -flibit
*/
/**
* \typedef SDL_Haptic
*

9
src/haptic/linux/SDL_syshaptic.c
View File

@ -801,7 +801,8 @@ SDL_SYS_ToFFEffect(struct ff_effect *dest, SDL_HapticEffect * src)
else if (periodic->type == SDL_HAPTIC_SAWTOOTHDOWN)
dest->u.periodic.waveform = FF_SAW_DOWN;
dest->u.periodic.period = CLAMP(periodic->period);
dest->u.periodic.magnitude = periodic->magnitude;
/* Linux expects 0-65535, so multiply by 2 */
dest->u.periodic.magnitude = CLAMP(periodic->magnitude) * 2;
dest->u.periodic.offset = periodic->offset;
/* Linux phase is defined in interval "[0x0000, 0x10000[", corresponds with "[0deg, 360deg[" phase shift. */
dest->u.periodic.phase = ((Uint32)periodic->phase * 0x10000U) / 36000;
@ -908,9 +909,9 @@ SDL_SYS_ToFFEffect(struct ff_effect *dest, SDL_HapticEffect * src)
dest->trigger.button = 0;
dest->trigger.interval = 0;
/* Rumble */
dest->u.rumble.strong_magnitude = leftright->large_magnitude;
dest->u.rumble.weak_magnitude = leftright->small_magnitude;
/* Rumble (Linux expects 0-65535, so multiply by 2) */
dest->u.rumble.strong_magnitude = CLAMP(leftright->large_magnitude) * 2;
dest->u.rumble.weak_magnitude = CLAMP(leftright->small_magnitude) * 2;
break;