bgfx/examples/14-shadowvolumes/fs_shadowvolume_svfronttex1.sc

/*
* Copyright 2013-2014 Dario Manesku. All rights reserved.
* License: http://www.opensource.org/licenses/BSD-2-Clause
*/

#include "../common/common.sh"

vec4 stencilColor(float _k)
{
   return vec4(float(abs(_k - 1.0) < 0.0001)/255.0
			 , float(abs(_k + 1.0) < 0.0001)/255.0
			 , float(abs(_k - 2.0) < 0.0001)/255.0
			 , float(abs(_k + 2.0) < 0.0001)/255.0
			 ); 
}

void main()
{
   float k = -1.0;
   if (gl_FrontFacing)
	   k = -k;

   gl_FragColor = stencilColor(k);
}