RtB/data/shaders/fb_vs.100.glsl

#version 100
// in
attribute vec3 vp;
// out
varying vec2 UV;

void main() {
  gl_Position = vec4(vp, 1.0);
  UV = (vp.xy + vec2(1.0, 1.0)) / 2.0;
  ///UV = vp.xy;
}