Trivial simple OpenGl working example

[Виталий Фадеев]

On Friday, 9 July 2021 at 19:15:44 UTC, H. S. Teoh wrote:
> On Fri, Jul 09, 2021 at 05:11:06AM +0000, Виталий Фадеев via 
> Digitalmars-d-learn wrote: [...]
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> Generally, text rendering on OpenGL is a huge pain to 
> implement. This is not specific to D, but to OpenGL in general, 
> because OpenGL itself does not have direct support for text 
> rendering at all.  The usual route is to use an existing 
> text-rendering library like FreeType to rasterize your text, 
> then upload it as a texture to the GPU and render it as a quad.
>
> [...]

Thank, H. S. Teoh!