Yes I can now use HLSL effects under D3D. So thanks for the tip. Not confident I would have arrived at that solution on my own.
I just used the settings in the standard MAME UI and away it went. I now get the "extended" set of sliders. The ones that control the bloom and saturation, distortion and masks, and more.
The exact integrated graphics chip is the Iris Plus 655 w/128MB eDRAM. Not Iris Pro, my bad.
I didn't have any luck with BGFX or GLSL. Just D3D. But I'm quite ok with that. The i7-8559U still gives hundreds or even thousands of % above normal framerate if you let it run unthrottled.
I will experiment around with BGFX and OpenGL more - for fun. Maybe I'm doing something wrong there or something.
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