/* Simple color classification shader.
 *
 */

#extension GL_ARB_texture_rectangle : enable

uniform float minintensity;
uniform float maxintensity;
uniform float minratio;

uniform sampler2DRect Image;

void main(void)
{
    vec3 incolor = texture2DRect(Image, gl_TexCoord[0].st).rgb;
    float accepted = step(incolor.r * minratio, incolor.g);
    accepted = accepted * step(minintensity, incolor.g);
    accepted = accepted * step(incolor.g, maxintensity);
    gl_FragColor.rgba = vec4(accepted);
}