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wined3d: Fix the spot light falloff == 0.0 case.

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Stefan Dösinger 2007-08-20 22:10:36 +02:00 committed by Alexandre Julliard
parent 36aef3dc54
commit a8d4779f7f
1 changed files with 8 additions and 3 deletions
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11
dlls/wined3d/device.c
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@ -2557,12 +2557,17 @@ static HRESULT WINAPI IWineD3DDeviceImpl_SetLight(IWineD3DDevice *iface, DWORD I
* furthermore if still used, probably nobody pays attention to such details.
*/
if (pLight->Falloff == 0) {
rho = 6.28f;
/* Falloff = 0 is easy, because d3d's and opengl's spot light equations have the
* falloff resp. exponent parameter as an exponent, so the spot light lighting
* will always be 1.0 for both of them, and we don't have to care for the
* rest of the rather complex calculation
*/
object->exponent = 0;
} else {
rho = pLight->Theta + (pLight->Phi - pLight->Theta)/(2*pLight->Falloff);
if (rho < 0.0001) rho = 0.0001f;
object->exponent = -0.3/log(cos(rho/2));
}
if (rho < 0.0001) rho = 0.0001f;
object->exponent = -0.3/log(cos(rho/2));
if (object->exponent > 128.0) {
object->exponent = 128.0;
}