import QtQuick 2.2
import QtGraphicalEffects 1.0

ShaderTerminal{
    property alias title: terminal.title
    property alias terminalSize: terminal.terminalSize

    id: mainShader
    opacity: appSettings.windowOpacity * 0.3 + 0.7

    blending: false

    Loader{
        id: frame
        anchors.fill: parent
        z: 2.1
        source: appSettings.frame_source
    }

    PreprocessedTerminal{
        id: terminal
        anchors.fill: parent
    }

    source: terminal.mainSource

    //  EFFECTS  ////////////////////////////////////////////////////////////////

    Loader{
        property real scaling: appSettings.bloom_quality * appSettings.window_scaling
        id: bloomEffectLoader
        active: appSettings.bloom_strength
        asynchronous: true
        width: parent.width * scaling
        height: parent.height * scaling
        sourceComponent: FastBlur{
            radius: 48 * scaling
            source: terminal.mainTerminal
            transparentBorder: true
        }
    }
    Loader{
        id: bloomSourceLoader
        active: appSettings.bloom_strength !== 0
        asynchronous: true
        sourceComponent: ShaderEffectSource{
            id: _bloomEffectSource
            sourceItem: bloomEffectLoader.item
            hideSource: true
            smooth: true
            visible: false
        }
    }

    bloomSource: bloomSourceLoader.item

    ShaderEffect {
        id: rasterizationEffect
        width: parent.width
        height: parent.height
        property real outColor: 0.0
        property real dispX: (5 / width) * appSettings.window_scaling
        property real dispY: (5 / height) * appSettings.window_scaling
        property size virtual_resolution: terminal.virtualResolution

        blending: false

        fragmentShader:
            "uniform lowp float qt_Opacity;" +

            "varying highp vec2 qt_TexCoord0;
             uniform highp vec2 virtual_resolution;
             uniform highp float dispX;
             uniform highp float dispY;
             uniform mediump float outColor;

             highp float getScanlineIntensity(vec2 coords) {
                 highp float result = 1.0;" +

                (appSettings.rasterization != appSettings.no_rasterization ?
                    "result *= abs(sin(coords.y * virtual_resolution.y * "+Math.PI+"));" : "") +
                (appSettings.rasterization == appSettings.pixel_rasterization ?
                    "result *= abs(sin(coords.x * virtual_resolution.x * "+Math.PI+"));" : "") + "

                return result;
             }" +

            "void main() {" +
                "highp float color = getScanlineIntensity(qt_TexCoord0);" +

                "float distance = length(vec2(0.5) - qt_TexCoord0);" +
                "color = mix(color, 0.0, 1.2 * distance * distance);" +

                "color *= outColor + smoothstep(0.00, dispX, qt_TexCoord0.x) * (1.0 - outColor);" +
                "color *= outColor + smoothstep(0.00, dispY, qt_TexCoord0.y) * (1.0 - outColor);" +
                "color *= outColor + (1.0 - smoothstep(1.00 - dispX, 1.00, qt_TexCoord0.x)) * (1.0 - outColor);" +
                "color *= outColor + (1.0 - smoothstep(1.00 - dispY, 1.00, qt_TexCoord0.y)) * (1.0 - outColor);" +

                "gl_FragColor.a = color;" +
            "}"

        onStatusChanged: if (log) console.log(log) //Print warning messages
    }

    rasterizationSource: ShaderEffectSource{
        id: rasterizationEffectSource
        sourceItem: rasterizationEffect
        hideSource: true
        smooth: true
        wrapMode: ShaderEffectSource.ClampToEdge
        visible: false
    }
}