bgfx/examples/16-shadowmaps/vs_shadowmaps_packdepth_linear.sc

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$input a_position
$output v_depth
/*
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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
*/
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#include "../common/common.sh"
void main()
{
gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
v_depth = gl_Position.z * 0.5 + 0.5;
}