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eae454e330
OpenGl_Workspace::updateMaterial() - do not activate writing into Depth buffer without Graphic3d_ZLayerDepthWrite flag. Add method OpenGl_Workspace::UseDepthWrite() to track glDepthMask() state. Drop the following outdated API methods conflicting with Z-layers API: - V3d_View::EnableDepthTest(), V3d_View::IsDepthTestEnabled() - Visual3d_View::ZBufferIsActivated(), Visual3d_View::SetZBufferActivity(), Visual3d_View::EnableDepthTest(), Visual3d_View::IsDepthTestEnabled() - Graphic3d_GraphicDriver::SetDepthTestEnabled(), Graphic3d_GraphicDriver::IsDepthTestEnabled() Activate Z-buffer by default, and manage it state only by Z-layer flags.