bgfx/examples/16-shadowmaps/fs_shadowmaps_packdepth.sc

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$input v_position
/*
* Copyright 2013 Dario Manesku. All rights reserved.
* License: http://www.opensource.org/licenses/BSD-2-Clause
*/
#include "../common/common.sh"
void main()
{
float depth = v_position.z/v_position.w * 0.5 + 0.5;
gl_FragColor = packFloatToRgba(depth);
}