Using texture in GL shader in ARKit

I am trying to use GLKTextureLoader to load a texture into a custom shader written in GLSL. It loads all the vertex and fragment shader bits just fine, but when I try to load a texture it quits.

This is how I'm trying to accomplish it:

do {
guard let CGImage = #imageLiteral(resourceName: "image01").cgImage else { print("no CGImage"); return nil}
let texture = try GLKTextureLoader.texture(with: CGImage, options: nil)
} catch {
print("Texture not loaded", (error))
}


it seems to get the CGImage, but fails on the GLKTextureLoader.texture bit.
Here is the error:

GLKTextureLoader.texture

Error Domain=GLKTextureLoaderErrorDomain Code=17 "(null)" UserInfo={GLKTextureLoaderErrorKey=Invalid EAGL context}


I've tried logging the GL errors with NSLog("GL Error = %u", glGetError()); but that just gives me GL Error = 0

NSLog("GL Error = %u", glGetError());

GL Error = 0

This is the first real project I'm trying with swift, is there something obvious I'm missing? Or is mixing ARKit with GLSL shaders just impossible?

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