#version 120

attribute mat4 vWorld;
attribute vec3 vPosition;
attribute vec2 vTexcoord;

uniform mat4 view;
uniform mat4 proj;

varying vec2 fTexcoord;
varying float fDepth;

void main() {
  fTexcoord = vTexcoord;
  vec4 screen_position = proj * view * vWorld * vec4(vPosition, 1);
  fDepth = screen_position.z / screen_position.w;
  gl_Position = screen_position;
}