wined3d: Set spotlight direction .w component to 0.0f.
It's a direction so we don't want to get translations applied to it. The variable is only used internally.
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@ -1550,7 +1550,7 @@ HRESULT CDECL wined3d_device_set_light(struct wined3d_device *device,
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object->lightDirn[0] = light->direction.x;
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object->lightDirn[1] = light->direction.y;
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object->lightDirn[2] = light->direction.z;
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object->lightDirn[3] = 1.0f;
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object->lightDirn[3] = 0.0f;
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/* opengl-ish and d3d-ish spot lights use too different models
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* for the light "intensity" as a function of the angle towards
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