#version 450 core
out gl_PerVertex
{
vec4 gl_Position;
};
void main()
{
const vec4 vertices[3] = vec4[3](vec4( 0.25, -0.25, 0.5, 1.0),
vec4(-0.25, -0.25, 0.5, 1.0),
vec4( 0.25, 0.25, 0.5, 1.0));
gl_Position = vertices[gl_VertexID];
}