DepthStencilBuffer

Scaleform::RefCountImplCore
    Scaleform::RefCountVImpl
        Scaleform::Render::RenderBuffer
            Scaleform::Render::DepthStencilBuffer

class DepthStencilBuffer : public RenderBuffer;

DepthStencilBuffer is created internally by HAL but is managed through RenderBufferManager to enable reuse. Unlike RenderTarget, which is expected to service longer and thus has SetInUse function to control caching, DeptStencilBuffer is seen as temporary. Thus its Release() function play a role of making it available for use.

Render_Buffer.h