void SetupDirectionalLight(int index, int visibleIndex, ref VisibleLight visibleLight, Light light)
{
/*
* Light light = RenderSettings.sun;
* buffer.SetGlobalVector(dirLightColorId, light.color.linear * light.intensity);
* buffer.SetGlobalVector(dirLightDirectionId, -light.transform.forward);
*/
dirLightColors[index] = visibleLight.finalColor;
Vector4 dirAndMask = -visibleLight.localToWorldMatrix.GetColumn(2);
dirAndMask.w = light.renderingLayerMask.ReinterpretAsFloat();
dirLightDirectionsAndMasks[index] = dirAndMask;
//register the shadow casting lights
dirLightShadowData[index] = shadows.ReserveDirectioanlShadows(light, visibleIndex);
}