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dinput: Simplify cartesian and fix polar direction calculations. 

Based on formulas by Elias Vanderstuyft.

Signed-off-by: Bruno Jesus <00cpxxx@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Bruno Jesus 2016-08-24 22:55:58 -03:00 committed by Alexandre Julliard
parent d0070935e4
commit 79b5883fce
1 changed files with 26 additions and 17 deletions
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43
dlls/dinput/effect_linuxinput.c
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@ -519,23 +519,32 @@ static HRESULT WINAPI LinuxInputEffectImpl_SetParameters(
/* one-axis effects must use cartesian coords */
return DIERR_INVALIDPARAM;
}
} else { /* two axes */
if (peff->dwFlags & DIEFF_CARTESIAN) {
LONG x, y;
if (This->first_axis_is_x) {
x = peff->rglDirection[0];
y = peff->rglDirection[1];
} else {
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 */
This->effect.direction = (int)(((double)peff->rglDirection[0] - 90) / 35999) * 0x7FFF;
}
}
}
/* two axes */
else
{
if (peff->dwFlags & DIEFF_CARTESIAN)
{
LONG x, y;
if (This->first_axis_is_x)
{
x = peff->rglDirection[0];
y = peff->rglDirection[1];
}
else
{
x = peff->rglDirection[1];
y = peff->rglDirection[0];
}
This->effect.direction = (unsigned int)((M_PI / 2 + atan2(y, x)) * 0x8000 / M_PI);
}
else
{
/* Polar and spherical are the same for 2 axes */
/* Precision is important here, so we do double math with exact constants */
This->effect.direction = (unsigned int)(((double)peff->rglDirection[0] / 18000) * 0x8000);
}
}
}
if (dwFlags & DIEP_DURATION)