#version 120

varying vec2 fragTexCoord;
varying vec4 fragColor;

uniform sampler2D texture0;
uniform vec4 colDiffuse;

const float smoothing = 1.0/16.0;

void main() {
    float distance = texture2D(texture0, fragTexCoord).a;
    float alpha = smoothstep(0.5 - smoothing, 0.5 + smoothing, distance);
    gl_FragColor = vec4(fragColor.rgb, fragColor.a * alpha);
}