bgfx/examples/16-shadowmaps/fs_shadowmaps_packdepth_vsm_linear.sc

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$input v_depth
/*
* 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_depth;
float depthSq = depth*depth;
//TODO: try this.
//vec2 dxy = vec2(dFdx(depth), dFdy(depth));
//depthSq += 0.25*dot(dxy, dxy);
gl_FragColor = vec4(packHalfFloat(depth), packHalfFloat(depthSq));
}