bgfx/examples/14-shadowvolumes/vs_shadowvolume_svside.sc

$input a_position, a_texcoord0
$output v_k

/*
 * Copyright 2013-2014 Dario Manesku. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
 */

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

uniform vec4 u_virtualLightPos_extrusionDist;

#define u_virtualLightPos   u_virtualLightPos_extrusionDist.xyz
#define u_extrusionDistance u_virtualLightPos_extrusionDist.w

void main()
{
	vec3 pos = a_position;
	if (a_texcoord0.x == 1.0)
	{
		vec3 toLight = pos - u_virtualLightPos;
		pos += normalize(toLight) * u_extrusionDistance;
	}
	gl_Position = mul(u_modelViewProj, vec4(pos, 1.0));

	v_k = a_texcoord0.y;
}