bgfx/examples/16-shadowmaps/fs_shadowmaps_unpackdepth.sc

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$input v_texcoord0
/*
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* Copyright 2013-2014 Dario Manesku. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
*/
#include "../common/common.sh"
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SAMPLER2D(s_shadowMap0, 4);
uniform vec4 u_params2;
#define u_depthValuePow u_params2.x
void main()
{
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float depth = unpackRgbaToFloat(texture2D(s_shadowMap0, v_texcoord0) );
vec3 rgba = pow(vec3_splat(depth), vec3_splat(u_depthValuePow) );
gl_FragColor = vec4(rgba, 1.0);
}