Sergii Ushakov developed a software rendering path for DMABUF-based framebuffers in the utmapp/gfxstream repository, focusing on enhancing cross-hardware compatibility and reducing reliance on native GPU resources. By leveraging C++ and advanced graphics programming techniques, Sergii integrated SwiftShader and Angle to enable rendering in environments without direct GPU access. The work included emulating DMABUF with OPAQUE_FD to streamline memory management and broaden platform support, as well as refining Vulkan external memory handle processing to improve reliability in diverse rendering scenarios. This feature addressed compatibility challenges and demonstrated depth in driver development and low-level graphics systems integration.