///////////////////////////////////////////////////////////////////////////////
//
//      ##  ######
//       ######  ###
//  ## ###############        Shark 3D Engine (www.shark3d.com)
//   ########## # # #
//    ########                Copyright (c) 1996-2006 Spinor GmbH.
//   ######### # # #          All rights reserved.
//  ##   ##########
//      ##
//
///////////////////////////////////////////////////////////////////////////////

uniform vec4 passInfo;
uniform vec4 tex0RcpSize;

varying vec4 baseVec;

void main(void)
{
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

    vec4 posView = gl_ModelViewMatrix * gl_Vertex;
    gl_FogFragCoord = posView.z / posView.w;

    gl_FrontColor = gl_Color;
    gl_TexCoord[0].xy = gl_MultiTexCoord0.xy;

    // Scaling offset
    float iter = passInfo.x;

    vec2 offsScale = tex0RcpSize.xy * pow(2.0, iter) * 0.5;

    vec4 dirVec;
    float fiter = mod(iter, 4.0);
    if(fiter < 2.0)
    {
        if(fiter < 1.0)
            dirVec = vec4(1.0, 0.0, 0.0, 1.0); // Vectors (1, 0) and (0, 1)
        else
            dirVec = vec4(1.0, 1.0,-1.0, 1.0); // Vectors (1, 1) and (-1, 1)
    }
    else
    {
        if(fiter < 3.0)
            dirVec = vec4(2.0, 1.0, -1.0, 2.0); // Vectors (2, 1) and (-1, 2)
        else
            dirVec = vec4(1.0, 2.0, -2.0, 1.0); // Vectors (1, 2) and (-2, 1)
    }

    baseVec = dirVec * offsScale.xyxy;
}

///////////////////////////////////////////////////////////////////////////////