@Override
public RenderState extract(final Stack<? extends RenderState> stack, final Spatial spat) {
if (spat == null) {
return stack.peek();
}
final LightCombineMode mode = spat.getLightCombineMode();
final Mesh mesh = (Mesh) spat;
LightState lightState = mesh.getLightState();
if (lightState == null) {
lightState = new LightState();
mesh.setLightState(lightState);
}
lightState.detachAll();
if (mode == LightCombineMode.Replace || (mode != LightCombineMode.Off && stack.size() == 1)) {
// todo: use dummy state if off?
final LightState copyLightState = (LightState) stack.peek();
copyLightState(copyLightState, lightState);
} else {
// accumulate the lights in the stack into a single LightState object
final Object states[] = stack.toArray();
boolean foundEnabled = false;
switch (mode) {
case CombineClosest:
case CombineClosestEnabled:
for (int iIndex = states.length - 1; iIndex >= 0; iIndex--) {
final LightState pkLState = (LightState) states[iIndex];
if (!pkLState.isEnabled()) {
if (mode == LightCombineMode.CombineClosestEnabled) {
break;
}
continue;
}
foundEnabled = true;
copyLightState(pkLState, lightState);
}
break;
case CombineFirst:
for (int iIndex = 0, max = states.length; iIndex < max; iIndex++) {
final LightState pkLState = (LightState) states[iIndex];
if (!pkLState.isEnabled()) {
continue;
}
foundEnabled = true;
copyLightState(pkLState, lightState);
}
break;
case Off:
break;
}
lightState.setEnabled(foundEnabled);
}
return lightState;
}
