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Removed misleading comment

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Fixes https://github.com/libsdl-org/SDL/issues/5069

(cherry picked from commit 66cf30c2de4f12c1b99b8d51ea5d77b62b373907)
This commit is contained in:
Sam Lantinga 2023-11-06 19:33:22 -08:00
parent 0c85173d5b
commit d6c725d522
1 changed files with 0 additions and 11 deletions
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11
src/haptic/linux/SDL_syshaptic.c
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@ -647,17 +647,6 @@ static int SDL_SYS_ToDirection(Uint16 *dest, SDL_HapticDirection *src)
switch (src->type) { switch (src->type) {
case SDL_HAPTIC_POLAR: case SDL_HAPTIC_POLAR:
/* Linux directions start from south.
(and range from 0 to 0xFFFF)
Quoting include/linux/input.h, line 926:
Direction of the effect is encoded as follows:
0 deg -> 0x0000 (down)
90 deg -> 0x4000 (left)
180 deg -> 0x8000 (up)
270 deg -> 0xC000 (right)
The force pulls into the direction specified by Linux directions,
i.e. the opposite convention of SDL directions.
*/
tmp = ((src->dir[0] % 36000) * 0x8000) / 18000; /* convert to range [0,0xFFFF] */ tmp = ((src->dir[0] % 36000) * 0x8000) / 18000; /* convert to range [0,0xFFFF] */
*dest = (Uint16)tmp; *dest = (Uint16)tmp;
break; break;