Written with Ebitengine.
Check out my blog post about this.
Two shader version are available as gol.NextGridShader and gil.NextGridShaderV2 at ./gol/shader.go, with a Keyboard input they can be swapped at runtime using the H key.
The first version encodes the grid by setting the Alpha value on each pixel of an image, the shader calculates the live neighbours to each pixel.
The second version encodes the grid in a smaller number of pixels by using the 4 channels of each pixel (RGBA).
Compiling: https://ebitengine.org/en/documents/webassembly.html