Since the implementation of dynarec on PSX Beetle HW core the “Texture Filtering” does nothing under any GL retroarch driver output but it works under vulkan. None of the filters (3-point, JINC2, xBR, etc) seems to affect the image on any GL Driver (glcore, gl or gl1).
On vulkan the Texture Filtering option does work as intended.
System PC Phenom II X4 960t Video card GTX 760. Windows 10 1909 64bit
The same issue is present on Ubuntu 18.04 with propietary Nvidia driver. same machine.