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    rlsw – Raylib software OpenGL renderer in less than 5k LOC

    (github.com)
    241 points fschuett | 11 comments | 21 Oct 25 21:00 UTC | HN request time: 0.013s | source | bottom
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    brcmthrowaway ◴[21 Oct 25 23:41 UTC] No.45663181[source]▶
    Does this support CUDA?
    replies(1): >>45663260 #
    1. Pannoniae ◴[21 Oct 25 23:51 UTC] No.45663260[source]▶
    No, this is CPU rendering only! Not even SIMD, just straightforward integer (and float) code.
    replies(3): >>45663279 #>>45663867 #>>45664581 #
    2. brcmthrowaway ◴[21 Oct 25 23:53 UTC] No.45663279[source]▶
    Now make it fixed point
    replies(2): >>45664995 #>>45667169 #
    3. SJC_Hacker ◴[22 Oct 25 01:15 UTC] No.45663867[source]▶
    If its OpenGL why is it CPU only ?
    replies(1): >>45663925 #
    4. bitwize ◴[22 Oct 25 01:25 UTC] No.45663925[source]▶
    OpenGL is an API. Software renderers for it—like the one that originally came with Windows NT, or even early versions of Mesa—have been out for a long time.
    replies(1): >>45663958 #
    5. SJC_Hacker ◴[22 Oct 25 01:30 UTC] No.45663958{3}[source]▶
    I haven't messed with it for a while, but last I checked it really wasn't that much code to make it run on the GPU. Maybe an extra 100 lines or so. Although you couldn't use windowed mode, had to be fullscreen.
    replies(1): >>45665004 #
    6. bee_rider ◴[22 Oct 25 03:18 UTC] No.45664581[source]▶
    It would be kind of neat to have OpenGL running on AVX-512, just for fun…
    replies(1): >>45667931 #
    7. avadodin ◴[22 Oct 25 04:50 UTC] No.45664995[source]▶
    Fixed point would be hell trying to keep track of the ranges. Maybe Posits or LNSs.
    8. apgwoz ◴[22 Oct 25 04:52 UTC] No.45665004{4}[source]▶
    Haven’t messed with what?

    This is an implementation of the OpenGL API interface. It is not OpenGL. It does not support GPU acceleration. It does math with floating point on the CPU. It then draws points and lines on a 2D surface provided by raylib.

    Could this be adapted to use SIMD, or a GPU? Sure. That is not what this is today.

    9. mvx64 ◴[22 Oct 25 10:40 UTC] No.45667169[source]▶
    Shout out to King's Crook [1], a cool project using a custom C software renderer only using integers

    [1] https://kingscrook.itch.io/kings-crook

    replies(1): >>45669624 #
    10. fuhsnn ◴[22 Oct 25 12:19 UTC] No.45667931[source]▶
    I believe Mesa's llvmpipe backend can do that to a degree, never tried, though.
    11. lmp88959 ◴[22 Oct 25 14:25 UTC] No.45669624{3}[source]▶
    Hey that's my project! Thanks for the shout out c: