https://github.com/dfirebaugh/sfb
experimental software renderer
https://github.com/dfirebaugh/sfb
Last synced: 8 months ago
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experimental software renderer
- Host: GitHub
- URL: https://github.com/dfirebaugh/sfb
- Owner: dfirebaugh
- License: mit
- Created: 2024-07-28T01:42:43.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2024-07-28T01:52:50.000Z (almost 2 years ago)
- Last Synced: 2024-12-27T19:29:47.718Z (over 1 year ago)
- Language: Go
- Size: 54.7 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# sfb
This is kind of an expiremental project and possibly a bad idea. So, I wouldn't
necessarily recommend using it.
## high level goal
build a software renderer that can be used reasonably easily on machines with
low or no gpu
### justifications
- to get some experience writing a wrapper around C for go libraries
- to explore the possibilities of making a software renderer (for machines with
no gpu)
- to get some concurrency reps in
### how does it work?
1. The C layer calls SDL2 to load a window.
1. We create a texture.
1. we fill a buffer with pixels and then load it to that texture
1. a small api is exposed through a shared object file
1. there's a go wrapper library that hooks into that .so file and allows us to
set individual pixels in the buffer
1. to draw shapes, we use some well known drawing algorithms that I tried to
concurrency-ify
obviously, there are some limitations here. Like the larger your window is the
slower it will run and the cost of rendering a shape is bound to the size of the
shape. However, I was able to get these circles moving around at over 100fps
(granted that's on a computer that has a pretty fast cpu)
I'd like to play around with rewriting the drawing functions in C to explore
simd operations. That's unexplored terrority for me, but maybe I'll jump down
that rabbit hole someday.
### how to run
You need sdl on your system:
```bash
apt install libsdl2-dev
```
```bash
make # make the .so file
go run ./examples/big_circle/ # run one of the examples
```