Thanks for the quick response. Can you elaborate a bit more? I've
never worked with OpenGL before, so I don't know exactly how to start
with that.
I found that I can use the mapped screen directly to generate a
monochrome bitbmap.
(make-monochrome-bitmap 512 256
(apply bytes (map (lambda (x) (modulo x 255)) (range (* 512 256)))))
With that I can get rid of the transformation bits->argb-bytes->pict->bitmap.
I saw gl-context but I didn't figure out how to use it the image that
I send to big-bang.
Thanks,
Wanderley
On Tue, Oct 22, 2019 at 8:58 AM Jay McCarthy <jay.mccar...@gmail.com> wrote:
>
> I would use a really simple OpenGL draw call that just draws a
> rectangle and update the texture contents with the screen bits.
>
> --
> Jay McCarthy
> Associate Professor @ CS @ UMass Lowell
> http://jeapostrophe.github.io
> Vincit qui se vincit.
>
> On Tue, Oct 22, 2019 at 6:54 PM wanderley.guimar...@gmail.com
> <wanderley.guimar...@gmail.com> wrote:
> >
> > Hi folks,
> >
> > I decided to write a computer simulator (16-bit machine as the one
> > built in nand2tetris course) in Racket. The computer maps the screen
> > to a memory space where bits represent the pixel colors (black and
> > white).
> >
> > Right now, I am generating the screen image by converting the bits to
> > a vector of argb pixels and then converting it to bitmap using
> > argb-pixels->pict and then pict-bitmap. The screen updates 10 frames
> > per second but this conversion bits->bitmap is a bottleneck even in
> > this low rate of update.
> >
> > How would be a better approach for this process? I can imagine how an
> > incremental approach can be faster by only changing the necessary
> > parts of the image, but my idea of representing the screen as a
> > quadtree sounds too complex to be the right path.
> >
> > Thanks,
> > Wanderley Guimarães
> >
> > --
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--
Abraço,
Wanderley Guimarães
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