I want a minimal example of plotting data using pure Julia code

sdanisch · June 28, 2022, 11:32am

I’d add to that, that WebGL and OpenGL are more considered a driver for the GPU than an actual drawing library like Cairo or GR.
So, that’s the most low-level you can go in that regard, if you want GPU acceleration.
I prototyped a pure Julia rasterizer at some point, which then would do the same as OpenGL, just on the CPU in 100% julia code. It turned out surprisingly short and actually still lurks in the Makie repository, waiting to get brought back to life:

github.com

JuliaPlots/Makie.jl/blob/master/src/jl_rasterizer/main.jl

using Colors, ColorVectorSpace
using GeometryBasics, Interpolations
using ImageShow
using Makie: orthographicprojection

@inline function edge_function(a, b, c)
    (c[1] - a[1]) * (b[2] - a[2]) - (c[2] - a[2]) * (b[1] - a[1])
end

@inline function src_alpha(c::T) where T <: Colorant
    a = alpha(c)
    a == 0.0 && return zero(T)
    c ./ a
end

one_minus_alpha(c::T) where {T <: Colorant} = one(T) .- src_alpha(c)
blend(source, dest, src_func, dest_func) = clamp01(src_func(source) .+ dest_func(dest))
ColorTypes.alpha(x::StaticVector) = x[4]

function standard_transparency(source, dest::T) where T

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I tried at some point to make it work with the newest Julia, so I think it runs right now, but if I remember correctly there was a bug that I didn’t have patience to fix.

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I want a minimal example of plotting data using pure Julia code

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