
layout (location = 0) in vec4 offset;

void main(void)
{  
  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] + offset;
}
