#version 120
// input
uniform vec2 resolution;  // display resolution
attribute vec3 vp;        // vertex position
uniform vec2 vp_offset;   // vertex offset (draw position)
attribute vec2 uv;        // UV map
uniform vec2 uv_offset;   // offset within the UV map
// output
varying vec2 frag_uv;

void main() {
  vec2 pos = vp.xy + vp_offset;
  gl_Position = vec4(pos/resolution, 1.0, 1.0);
  frag_uv = vec2(uv.s+uv_offset.x, 1.0 - uv.t+uv_offset.y);
}