/*
--------------------------------------------------------------------------------
This source file is part of SkyX.
Visit http://www.paradise-studios.net/products/skyx/

Copyright (C) 2009-2012 Xavier Verguín González <xavyiy@gmail.com>

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
--------------------------------------------------------------------------------
*/

// --------------------- SkyX moon material ------------------------
// ------------------------ GLSL Vertex ----------------------------

// IN
attribute vec4 vertex; // iPosition
attribute vec2 uv0;    // iUV
// OUT
varying vec4 vUVYLength;
// UNIFORM
uniform mat4 uWorld;
uniform vec3 uSkydomeCenter;

void main(void)
{
	// Clip space position
    gl_Position = gl_ModelViewProjectionMatrix * vertex;
	// World position
    vec3 ObjectSpacePosition = (uWorld * vertex).xyz - uSkydomeCenter;

    // UV
    vUVYLength.xy = uv0;
    // Z
    vUVYLength.z  = ObjectSpacePosition.z;
    // Length
    vUVYLength.w  = length(ObjectSpacePosition);
}