I think the code for regl for filtering is here: tex: regl.texture({ min: 'linear mipmap linear', mag: 'linear', wrap: 'repeat', data: makeWireframeTexture() }),

So the change would be to use 'linear' or 'nearest'. It's actually the mipmaps that are making things look blurry. Basically, the graphics card is scaling down the image and scaling it back up, which makes it blurry.