varying vec4 texcoord;
void main()
{
	gl_Position.zw = gl_Vertex.xy*2.0;
	gl_Position.xy = gl_Vertex.xy;
	texcoord.x = gl_Vertex.z;
	texcoord.yz = gl_Vertex.zw;
	texcoord.w = gl_Vertex.x;
}
