Fix: Reduced the number of draw calls in OITRenderStage
Fix: Reduced the number of draw calls in OITRenderStage

The depth buffer is now shared between the color and weight texture and only
rendered to once per frame.

kalatestimine/frak,lammas/frak-1.x,kalatestimine/frak,lammas/frak-1.x,3dtech/frak,3dtech/frak