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// Based on http://kodemongki.blogspot.com/2011/06/kameraku-custom-shader-effects-example.html

uniform float dividerValue;
uniform sampler2D source;
uniform lowp float qt_Opacity;
varying vec2 qt_TexCoord0;

void main()
{
    vec2 uv = qt_TexCoord0.xy;
    vec4 orig = texture2D(source, uv);
    vec3 col = orig.rgb;
    float y = 0.3 * col.r + 0.59 * col.g + 0.11 * col.b;
    if (uv.x < dividerValue)
        gl_FragColor = qt_Opacity * vec4(y + 0.15, y + 0.07, y - 0.12, 1.0);
    else
        gl_FragColor = qt_Opacity * orig;
}
