[Simh] Display using GPU shaders

[Paul Koning]

> On Jan 3, 2020, at 2:13 AM, Lars Brinkhoff <lars at nocrew.org> wrote:
> 
>> As far as I understand, SDL2 has some kind of support for using
>> shaders, so I believe there are no technical obstacles against adding
>> my code to SIMH.
> 
> Looking closer, I was wrong about this.  SDL only handles some basics.
> To use shaders, it's necessary to add direct calls to OpenGL (or on
> Windows maybe some other library?).

For a portable windowing library that includes OpenGL support, check out wxWidgets.  It's quite a lot heavier than SDL but it is quite friendly.

	paul