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If the issue concerns an operator that grab geodata from an external web service (Basemaps, OSM, SRTM), then it can be a network

Best explained here.

https://youtu.be/lcN-hRux4cU?t=381

Needs to be discussed first.

Currently BL_Shader (and derived KX_2DFilter) can setup a shader only by passing the code of each processing units.

The idea of this issue is to allow the user passing file name ending with .glsl:

sources = {
    "vertex" : "vert.glsl",
    "fragment" : "frag.glsl"
}

shader.setSourceList(source, True)