Shader compilation using the open source OpenGL driver

You can compile GLSL shaders to Broadcom Videocore IV assembly using the open source OpenGL driver by setting an environment variable. See here: https://github.com/anholt/mesa/blob/4a50bae1250ab776fab289df3ca16ba13e432d62/docs/envvars.html#L357

export VC4_DEBUG=qpu

This will make the OpenGL driver dump assembly in the form of 64 bit hexadecimal numbers that you can just load using rpi-vk-driver. You will need to create a mapping table between the Vulkan descriptors/push constants and the assembly, take a look at the tests that come with the driver for examples on how to do that.