#pragma MSP stage(vertex)
layout(location=0) in vec4 position;
layout(location=1) in vec4 v;
void main()
{
	float a = v.x-v.y;
	float b = v.z-v.w;
	float c = v.x-v.y;
	float d = v.z-v.w;
	float e = a-b;
	float f = c*d;
	gl_Position = position*(e+f);
}

/* Expected output: vertex
layout(location=0) in vec4 position;
layout(location=1) in vec4 v;
void main()
{
	gl_Position = position*((v.x-v.y-(v.z-v.w))+(v.x-v.y)*(v.z-v.w));
}
*/