Example code to run a simple shader/program on the gpu with Sokol?

[l1mey112]

I'm semi new to opengl and sokol in general. I want to find a way to write in GLSL and execute it on the gpu, hopefully in a parallelised way. Without creating vertex buffers or messing with windows, just a simple set of code with an input and an output ran on the gpu.

Thank you.

[larpon]

The "simple shader glsl" example is currently the simplest form of shader example we have - there are more advanced examples in the examples/sokol/ directory also.

If you're in V's project root dir you could do:

cd examples/sokol/simple_shader_glsl
v shader .
v run .

You'll have to run v shader . everytime you change the code in the shader (simple_shader.glsl)
You can read more about the shader tools and format here

(v shader is just a convenience wrapper around the sokol-shdc tool).

That's as simple as we can get it at this stage - hope it helps

[l1mey112]

I may try using cuda with C then use with V

[larpon]

That's probably the best bet - until we have something more integrated up and running 👍

[snakeru]

@l1mey112 did you find a way? I also need to get the compute shader results back in the CPU and it seems not possible at the moment (though there was some preliminary compute shader support merged to sokol 1-2 months ago, but not enough for this).

This is definitely not helped by the fact that this is the first real shader that I'm intending to write.

[Eliyaan]

Maybe take a look at https://github.com/vlang/vsl/tree/main/vcl

[snakeru]

@Eliyaan yes, that one looks extremely promising. I spent a couple of hours yesterday trying to get it running, but didn't succeed, it was complaining about inability to find the get_devices() function.
However, today I tried it again and it finally worked. The solution was to

cd .vmodules ; ln -s vsl/vcl .

I don't quite understand, why, but so long it works, I'm happy. Thank you for making me try it again!