- Qt 5.5
- Qt Quick
- Scene Graph - Two Texture Providers
- main.qml Example File
- Qt 5.5.1 Reference Documentation

# main.qml Example File

scenegraph/twotextureproviders/main.qml

    /****************************************************************************
    **
    ** Copyright (C) 2014 Gunnar Sletta <gunnar@sletta.org>
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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    import QtQuick 2.2
    import SceneGraphRendering 1.0

    Item {
        id: root

        // The checkers background
        ShaderEffect {
            anchors.fill: parent

            property real tileSize: 16
            property color color1: Qt.rgba(0.9, 0.9, 0.9, 1);
            property color color2: Qt.rgba(0.8, 0.8, 0.8, 1);

            property size pixelSize: Qt.size(width / tileSize, height / tileSize);

            fragmentShader:
                "
            uniform lowp vec4 color1;
            uniform lowp vec4 color2;
            uniform highp vec2 pixelSize;
            varying highp vec2 qt_TexCoord0;
            void main() {
                highp vec2 tc = sign(sin(3.14152 * qt_TexCoord0 * pixelSize));
                if (tc.x != tc.y)
                    gl_FragColor = color1;
                else
                    gl_FragColor = color2;
            }
            "
        }

        width: 320
        height: 480

        Item {
            id: box
            width: root.width * 0.9
            height: width

            Rectangle {
                anchors.centerIn: parent
                width: parent.width * 0.9
                height: parent.width * 0.4
                radius: width * 0.1;
                gradient: Gradient {
                    GradientStop { position: 0; color: Qt.hsla(0.6, 0.9, 0.9, 1); }
                    GradientStop { position: 1; color: Qt.hsla(0.6, 0.6, 0.3, 1); }
                }
                RotationAnimator on rotation { from: 0; to: 360; duration: 10000; loops: Animation.Infinite }
            }

            visible: false
            layer.enabled: true
        }

        Item {
            id: text
            width: box.width
            height: width
            Text {
                anchors.centerIn: parent
                color: "black" // Qt.hsla(0.8, 0.8, 0.8);
                text: "Qt\nQuick"

                horizontalAlignment: Text.AlignHCenter

                font.bold: true
                font.pixelSize: text.width * 0.25
                RotationAnimator on rotation { from: 360; to: 0; duration: 9000; loops: Animation.Infinite }
            }
            visible: false
            layer.enabled: true
        }

        XorBlender {
            anchors.horizontalCenter: parent.horizontalCenter
            y: root.height * 0.05;
            width: box.width
            height: box.height
            source1: box
            source2: text
        }

        Rectangle {
            id: labelFrame
            anchors.margins: -10
            radius: 10
            color: "white"
            border.color: "black"
            opacity: 0.8
            anchors.fill: description
        }

        Text {
            id: description
            anchors.left: parent.left
            anchors.right: parent.right
            anchors.bottom: parent.bottom
            anchors.margins: 20
            wrapMode: Text.WordWrap
            text: "This example creates two animated items and sets 'layer.enabled: true' on both of them. " +
                  "This turns the items into texture providers and we can access their texture from C++ in a custom material. " +
                  "The XorBlender is a custom C++ item which uses performs an Xor blend between them."
        }
    }