// Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

import QtQuick 2.2 as QQ2
import Qt3D.Core 2.0
import Qt3D.Render 2.1
import Qt3D.Input 2.0
import Qt3D.Extras 2.0

Entity {
    id: sceneRoot

    function requestRenderCapture()
    {
        return renderCapture.requestCapture()
    }

    Camera {
        id: camera
        projectionType: CameraLens.PerspectiveProjection
        fieldOfView: 45
        aspectRatio: 1
        nearPlane : 0.1
        farPlane : 1000.0
        position: Qt.vector3d(100.0, 100.0, 20.0)
        upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
        viewCenter: Qt.vector3d(0.0, 0.0, -8.0)
    }

    Camera {
        id: camera2
        projectionType: CameraLens.PerspectiveProjection
        fieldOfView: 15
        aspectRatio: 1
        nearPlane : 0.1
        farPlane : 1000.0
        position: Qt.vector3d( 0.0, 0.0, -40.0 )
        upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
        viewCenter: Qt.vector3d( 0.0, 0.0, 0.0 )
    }

    OrbitCameraController {
        camera: camera
    }

    components: [
        RenderSettings {
            activeFrameGraph: RenderSurfaceSelector {
                Viewport {
                    normalizedRect: Qt.rect(0, 0, 1, 1)

                    // Clear Back Buffer
                    ClearBuffers {
                        buffers: ClearBuffers.ColorDepthBuffer
                        clearColor: Qt.rgba(0, 0.5, 1, 1)
                        NoDraw { }
                    }

                    // Render to back buffer
                    CameraSelector {
                        camera: camera
                    }

                    // FBO
                    RenderTargetSelector {
                        target: RenderTarget {
                            attachments: [
                                RenderTargetOutput {
                                    attachmentPoint: RenderTargetOutput.Color0
                                    texture: Texture2D {
                                        id: colorTexture
                                        width: 400
                                        height: 400
                                        format: Texture.RGBAFormat
                                        generateMipMaps: false
                                        magnificationFilter: Texture.Linear
                                        minificationFilter: Texture.Linear
                                        wrapMode {
                                            x: WrapMode.ClampToEdge
                                            y: WrapMode.ClampToEdge
                                        }
                                    }
                                }
                            ]
                        }
                        // Clear FBO
                        ClearBuffers {
                            buffers: ClearBuffers.ColorDepthBuffer
                            clearColor: Qt.rgba(0, 0.5, 0.5, 1)
                            NoDraw { }
                        }

                        // Render into FBO
                        CameraSelector {
                            camera: camera
                            // Render Capture
                            RenderCapture {
                                id: renderCapture
                            }
                        }
                    }
                }
            }
        },
        // Event Source will be set by the Qt3DQuickWindow
        InputSettings { }
    ]

    PhongMaterial {
        id: material
    }

    TorusMesh {
        id: torusMesh
        radius: 5
        minorRadius: 1
        rings: 100
        slices: 20
    }

    Transform {
        id: torusTransform
        scale3D: Qt.vector3d(1.5, 1, 0.5)
        rotation: fromAxisAndAngle(Qt.vector3d(1, 0, 0), 45)
    }

    Entity {
        id: torusEntity
        components: [ torusMesh, material, torusTransform ]
    }

    SphereMesh {
        id: sphereMesh
        radius: 3
    }

    Transform {
        id: sphereTransform
        property real userAngle: 0.0
        matrix: {
            var m = Qt.matrix4x4();
            m.rotate(userAngle, Qt.vector3d(0, 1, 0));
            m.translate(Qt.vector3d(20, 0, 0));
            return m;
        }
    }

    QQ2.NumberAnimation {
        target: sphereTransform
        property: "userAngle"
        duration: 10000
        from: 0
        to: 360

        loops: QQ2.Animation.Infinite
        running: true
    }

    Entity {
        id: sphereEntity
        components: [ sphereMesh, material, sphereTransform ]
    }
}