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xTr1m, both are ascii anyway. As for the question, GLSL packs better, as you can do more stuff with less text.

nystep: sure, I just meant that the language basing on ascii chars in [0x21, 0x7D] compresses better than the language basing on the whole ascii table.

well regardless of how much of the ascii table you're using it's quite easy to do really repetitive shader code thus producing great compression rates.