sync code with last improvements from OpenBSD

lib/mesa/docs/drivers/radv.rst

@@ -0,0 +1,23 @@
+RADV
+====
+
+RADV is a Vulkan driver for AMD GCN/RDNA GPUs.
+
+Debugging
+---------
+
+For a list of environment variables to debug RADV, please see
+:ref:`radv env-vars` for a list.
+
+Hardware Documentation
+----------------------
+
+You can find a list of documentation for the various generations of
+AMD hardware on the `X.Org wiki
+<https://www.x.org/wiki/RadeonFeature/#documentation>`_.
+
+ACO
+---
+
+ACO is the shader-compiler used in RADV. You read its documentation
+`here <https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/src/amd/compiler/README.md>`_.