Mame GLSL guidance

[AlexisCh]

Hello guys again,

after lot of search and when I realised that my integrated intel gpu cannot afford HLSL settings through mame or Hyperspin,

I decided to go with GLSL, (thanks to agent)

But I am struggling to find a proper guide of how to do that,

 

I am using mame 0.172 version and the GLSL file is into bgfx folder under MAME.
But I cannot understand which file I need to change.

I feel totally dump, its not that straightforward to me, is not like the HLSL files

 

any advice would be helpful.