Indexed graphics for retro engine?

[Shadowblitz16]

On Thursday, 19 September 2019 at 19:16:03 UTC, Mike Parker wrote:
> On Thursday, 19 September 2019 at 18:25:05 UTC, Shadowblitz16 
> wrote:
>
>> I wanted to do 4bpp 16 color graphics.
>> and I didn't want to load anything unnecessary in the image 
>> like the palette but instead supply it myself as a Color[16];
>
> I see. In that case, I suggest you find some tutorials on 
> software rendering in C or C++ and adapt them to D. Most of the 
> modern stuff out there is going to be targeting 24-bit or 
> 32-bit graphics. You might find some older tutorials on indexed 
> 8-bit rendering that you can adapt to 4-bit. Nothing to it but 
> storing the palette indices in a byte array.

can I do this in D and draw them to a 32bpp bitmap pixel by pixel?
I would prefer do do this on the gpu but I don't know how.