//
// Fragment shader for testing the discard command
//
// Author: Randi Rost
//
// Copyright (c) 2002-2004 3Dlabs Inc. Ltd. 
//
// See 3Dlabs-License.txt for license information
//

varying vec3  DiffuseColor;
varying vec3  SpecularColor;

uniform vec2  Scale;
uniform vec2  Threshold;
uniform vec3  SurfaceColor;

void main (void)
{
    float ss = fract(gl_TexCoord[0].s * Scale.s);
    float tt = fract(gl_TexCoord[0].t * Scale.t);

    if ((ss > Threshold.s) && (tt > Threshold.t)) discard;

    vec3 finalColor = SurfaceColor * DiffuseColor + SpecularColor;
    gl_FragColor = vec4 (finalColor, 1.0);
}