#version 100

precision mediump int;
precision mediump float;

uniform mat4 worldViewProj;
attribute vec4 vertex;
varying vec2 uv;

void main()
{
    gl_Position = worldViewProj * vertex;
  	
	vec2 inPos = sign(vertex.xy);
	
	uv = (vec2(inPos.x, -inPos.y) + 1.0) / 2.0;
}