#version 430
#extension GL_ARB_separate_shader_objects : enable

const vec2 vdata[] = vec2[] (
		vec2(0.5, 0.5),
		vec2(0.5, -0.5),
		vec2(-0.5, 0.5),
		vec2(-0.5, -0.5));
void main()
{
	gl_Position = vec4(vdata[gl_VertexIndex], 0.0, 1.0);
}