bgfx/examples/14-shadowvolumes/fs_shadowvolume_svbacktex1.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);
}