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dinput: Fix effect direction conversion from DIEFF_CARTESIAN coordinates.

This commit is contained in:
Vincent Pelletier 2009-02-02 23:36:07 +01:00 committed by Alexandre Julliard
parent 209820c428
commit 7e7970830f
1 changed files with 9 additions and 7 deletions
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16
dlls/dinput/effect_linuxinput.c
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@ -55,6 +55,7 @@ struct LinuxInputEffectImpl
struct ff_effect effect; /* Effect data */
int gain; /* Effect gain */
int first_axis_is_x;
int* fd; /* Parent device */
struct list *entry; /* Entry into the parent's list of effects */
};
@ -548,6 +549,7 @@ static HRESULT WINAPI LinuxInputEffectImpl_SetParameters(
return DIERR_INVALIDPARAM;
else if (peff->cAxes < 1)
return DIERR_INCOMPLETEEFFECT;
This->first_axis_is_x = peff->rgdwAxes[0] == DIJOFS_X;
}
/* some of this may look funky, but it's 'cause the linux driver and directx have
@ -572,15 +574,15 @@ static HRESULT WINAPI LinuxInputEffectImpl_SetParameters(
}
} else { /* two axes */
if (peff->dwFlags & DIEFF_CARTESIAN) {
/* avoid divide-by-zero */
if (peff->rglDirection[1] == 0) {
if (peff->rglDirection[0] >= 0)
This->effect.direction = 0x4000;
else if (peff->rglDirection[0] < 0)
This->effect.direction = 0xC000;
LONG x, y;
if (This->first_axis_is_x) {
x = peff->rglDirection[0];
y = peff->rglDirection[1];
} else {
This->effect.direction = (int)(atan(peff->rglDirection[0] / peff->rglDirection[1]) * 0x7FFF / (3 * M_PI));
x = peff->rglDirection[1];
y = peff->rglDirection[0];
}
This->effect.direction = (int)((3 * M_PI / 2 - atan2(y, x)) * -0x7FFF / M_PI);
} else {
/* Polar and spherical are the same for 2 axes */
/* Precision is important here, so we do double math with exact constants */