/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

// Use QtQuick 2.8 to get GraphicsInfo and others
import QtQuick 2.8

Item {
    Rectangle {
        color: "gray"
        anchors.margins: 10
        anchors.fill: parent
        Image {
            id: image1
            source: "qrc:/qt.png"
        }
        ShaderEffectSource {
            id: effectSource1
            sourceItem: image1
            hideSource: true
        }
        ShaderEffect { // wobble
            id: eff
            width: image1.width
            height: image1.height
            anchors.centerIn: parent

            property variant source: effectSource1
            property real amplitude: 0.04 * 0.2
            property real frequency: 20
            property real time: 0

            NumberAnimation on time { loops: Animation.Infinite; from: 0; to: Math.PI * 2; duration: 600 }

            vertexShader: GraphicsInfo.shaderType === GraphicsInfo.GLSL ? "qrc:/wobble_legacy_gl.vert" : "qrc:/wobble.vert.qsb"
            fragmentShader: GraphicsInfo.shaderType === GraphicsInfo.GLSL ? "qrc:/wobble_legacy_gl.frag" : "qrc:/wobble.frag.qsb"
        }

        Image {
            id: image2
            source: "qrc:/face-smile.png"
        }
        ShaderEffectSource {
            id: effectSource2
            sourceItem: image2
            hideSource: true
        }
        ShaderEffect { // dropshadow
            id: eff2
            width: image2.width
            height: image2.height
            scale: 2
            x: 40
            y: 40

            property variant source: effectSource2

            property variant shadow: ShaderEffectSource {
                sourceItem: ShaderEffect {
                    width: eff2.width
                    height: eff2.height
                    property variant delta: Qt.size(0.0, 1.0 / height)
                    property variant source: ShaderEffectSource {
                        sourceItem: ShaderEffect {
                            id: innerEff
                            width: eff2.width
                            height: eff2.height
                            property variant delta: Qt.size(1.0 / width, 0.0)
                            property variant source: effectSource2
                            fragmentShader: GraphicsInfo.shaderType === GraphicsInfo.GLSL ? "qrc:/shadow_pass1_legacy_gl.frag" : "qrc:/shadow_pass1.frag.qsb"
                        }
                    }
                    fragmentShader: GraphicsInfo.shaderType === GraphicsInfo.GLSL ? "qrc:/shadow_pass1_legacy_gl.frag" : "qrc:/shadow_pass1.frag.qsb"
                }
            }
            property real angle: 0
            property variant offset: Qt.point(5.0 * Math.cos(angle), 5.0 * Math.sin(angle))
            NumberAnimation on angle { loops: Animation.Infinite; from: 0; to: Math.PI * 2; duration: 6000 }
            property variant delta: Qt.size(offset.x / width, offset.y / height)
            property real darkness: 0.5
            fragmentShader: GraphicsInfo.shaderType === GraphicsInfo.GLSL ? "qrc:/shadow_pass2_legacy_gl.frag" : "qrc:/shadow_pass2.frag.qsb"
        }

        Column {
            anchors.bottom: parent.bottom
            Text {
                color: "yellow"
                font.pointSize: 24
                text: {
                    if (GraphicsInfo.api === GraphicsInfo.OpenGL)
                        "OpenGL";
                    else if (GraphicsInfo.api === GraphicsInfo.Software)
                        "Software";
                    else if (GraphicsInfo.api === GraphicsInfo.Direct3D12)
                        "D3D12";
                    else if (GraphicsInfo.api === GraphicsInfo.OpenVG)
                        "OpenVG";
                    else if (GraphicsInfo.api === GraphicsInfo.OpenGLRhi)
                        "OpenGL via QRhi";
                    else if (GraphicsInfo.api === GraphicsInfo.Direct3D11Rhi)
                        "D3D11 via QRhi";
                    else if (GraphicsInfo.api === GraphicsInfo.VulkanRhi)
                        "Vulkan via QRhi";
                    else if (GraphicsInfo.api === GraphicsInfo.MetalRhi)
                        "Metal via QRhi";
                    else if (GraphicsInfo.api === GraphicsInfo.Null)
                        "Null via QRhi";
                    else
                        "Unknown API";
                }
            }
            Text {
                color: "yellow"
                font.pointSize: 24
                text: "Shader effect is " + (GraphicsInfo.shaderType === GraphicsInfo.HLSL
                                             ? "HLSL" : (GraphicsInfo.shaderType === GraphicsInfo.GLSL
                                                         ? "GLSL" : (GraphicsInfo.shaderType === GraphicsInfo.RhiShader
                                                                     ? "QRhiShader" : "UNKNOWN"))) + " based";
            }
            Text {
                text: GraphicsInfo.shaderType + " " + GraphicsInfo.shaderCompilationType + " " + GraphicsInfo.shaderSourceType
            }
            Text {
                //text: eff.status + " " + eff.log
            }
        }
    }
}