#pragma MSP stage(vertex)
layout(location=0) in vec4 position;
layout(location=1) in vec3 direction;
void main()
{
	vec3 p = position.xyz;
	int step = -1;
	for(int i=0; i<10; ++i)
	{
		float scale = 2.0;
		p += direction*scale;
		if(p.z<0.0)
			break;
		step = i;
	}
	gl_Position = position+vec4(step, 0.0, 0.0, 0.0);
}

/* Expected output: vertex
layout(location=0) in vec4 position;
layout(location=1) in vec3 direction;
void main()
{
	vec3 p = position.xyz;
	int step = -1;
	for(int i=0; i<10; ++i)
	{
		p += direction*2.0;
		if(p.z<0.0)
			break;
		step = i;
	}
	gl_Position = position+vec4(step, 0.0, 0.0, 0.0);
}
*/