Vulkan driver add-on host library (libvulkan.so, officially called “Vulkan ICD desktop loader”) can be used also for hardware accelerated drivers. Hardware acceleration should start working when GPU driver add-on will be installed.
Also software renderer allows to prepare Haiku infrastructure for hardware rendering. Primary difference between software and hardware renderer is output to regular RAM vs GPU RAM, the rest is almost the same. It is possible to render to GPU RAM offscreen.