Qt 5.6 | Qt Quick | Scene Graph - Two Texture Providers | main.qml Example File

Qt 5.6.2 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
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      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."
          }
      }