source: GTP/trunk/Lib/Illum/GPUObscurancesGT/src/transfer.vert @ 930

uniform float direction;

varying vec2 p1;
varying vec2 p2;
varying float factor;

void main()
{
        vec4 position = gl_Vertex;
        vec4 texCoord = gl_MultiTexCoord0;
        if(((direction == 0) && (position.b != 1.0) && (position.b < 0.0) && ((texCoord.b > 0.0) || (texCoord.b == 1)))
                || ((direction == 1) && (position.b != 1.0) && (position.b > 0.0) && ((texCoord.b < 0.0) || (texCoord.b == 1))))
        {

                p1 = vec2(position.r, position.g);

                p2 = vec2(texCoord.r, texCoord.g);

                gl_Position = vec4((p1 * 2.0) - vec2(1.0,1.0), 0.0,1.0);
                                
                if (texCoord.b == 1) factor = 1;
                else factor = abs(texCoord.a - position.a);
        }
        else
        {
                gl_Position = vec4( 0.0,0.0, 2.0, 1.0 );
                p1 = p2 = vec2(1.0,1.0);
                factor = 0.5;
        }       
}