varying vec4 color;

uniform int button;

void main( void ) {
	gl_Position = gl_Vertex;
	gl_Position.xy /= vec2(800, 600)*0.5;
	gl_Position.xy -= 1.0;
	gl_Position.y *= -1.0;

	if(button == 0)
		color = vec4(1.0);
	else if (button == 1)
		color = vec4(0.0, 1.0, 1.0, 1.0);
	else
		color = vec4(0.0, 0.0, 1.0, 1.0);
}