Player shadow z-fighting with decals

[ETLegacyTeam]

Author: @realkemon (keMoN)
Date: 2014-02-19
Redmine Issue: 515, https://dev.etlegacy.com/issues/515

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I couldn't find the shader for the player shadow (sprites/shadow_foot and sprites/shadow/torso), but I suppose it's using polygonoffset like decals do.
Anyways, I encountered that the player shadows flickers when standing on top of a decal (the effect when two textures are overlaying each other).
An exception are the tracks in fueldump and their shader uses sort decal in the shader ("sort parameter":http://q3map2.robotrenegade.com/docs/shader_manual/general-directives.html#sort )
Decal isn't one of those options, but obviously exists. This parameter varies the height on which textures/shaders are drawn, so that should be the desired parameter.

I would've tested some options of 'sort' myself, but I couldn't find the shader for the shadows.

[ETLegacyTeam]

From: @realkemon (keMoN)
Date: 2014-02-22T13:41:02Z

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The shaders for shadow_foot and shadow_torso are located in _unsorted.shader
I tested several options of the 'sort'-parm, but nothing worked properly.