GLUtil-0.1.4: examples/shaders/hello-gl.frag

#version 110

uniform float fade_factor;
uniform sampler2D textures[2];
varying vec2 texcoord;

void main()
{

    gl_FragColor = mix(
        texture2D(textures[0], texcoord),
        texture2D(textures[1], texcoord),
        fade_factor);
}