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import QtQuick 2.0

Effect {
    parameters: ListModel {
        ListElement {
            name: "sharpness"
            value: 0.5
        }
    }

    // Transform slider values, and bind result to shader uniforms
    property real amount: parameters.get(0).value * 18

    fragmentShaderSrc: "uniform float dividerValue;
                        uniform float amount;
                        const float step_w = 0.0015625;
                        const float step_h = 0.0027778;

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

                        vec3 sharpen(vec3 t1, vec3 t2, vec3 t3, vec3 t4, vec3 t5, vec3 t6, vec3 t7, vec3 t8, vec3 t9)
                        {
                            return -t1 - t2 - t3 - t4 + amount * t5 - t6 - t7 - t8 - t9;
                        }

                        void main()
                        {
                            vec2 uv = qt_TexCoord0.xy;
                            vec3 t1 = texture2D(source, vec2(uv.x - step_w, uv.y - step_h)).rgb;
                            vec3 t2 = texture2D(source, vec2(uv.x, uv.y - step_h)).rgb;
                            vec3 t3 = texture2D(source, vec2(uv.x + step_w, uv.y - step_h)).rgb;
                            vec3 t4 = texture2D(source, vec2(uv.x - step_w, uv.y)).rgb;
                            vec3 t5 = texture2D(source, uv).rgb;
                            vec3 t6 = texture2D(source, vec2(uv.x + step_w, uv.y)).rgb;
                            vec3 t7 = texture2D(source, vec2(uv.x - step_w, uv.y + step_h)).rgb;
                            vec3 t8 = texture2D(source, vec2(uv.x, uv.y + step_h)).rgb;
                            vec3 t9 = texture2D(source, vec2(uv.x + step_w, uv.y + step_h)).rgb;
                            vec3 col = sharpen(t1, t2, t3, t4, t5, t6, t7, t8, t9);
                            if (uv.x < dividerValue)
                                gl_FragColor = qt_Opacity * vec4(col, 1.0);
                            else
                                gl_FragColor = qt_Opacity * texture2D(source, uv);
                        }"
}