/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL3$
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** GNU Lesser General Public License Usage
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
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****************************************************************************/

import Qt3D.Core 2.0
import Qt3D.Render 2.0

FrameGraph {
    id: root

    property alias viewCamera: viewCameraSelector.camera
    property alias lightCamera: lightCameraSelector.camera
    readonly property Texture2D shadowTexture: depthTexture

    activeFrameGraph: Viewport {
        rect: Qt.rect(0.0, 0.0, 1.0, 1.0)
        clearColor: Qt.rgba(0.0, 0.0, 0.0, 1.0)

        TechniqueFilter {
            requires: [ Annotation { name: "name"; value: "Desktop" } ]

            RenderPassFilter {
                includes: [ Annotation { name: "pass"; value: "shadowmap" } ]

                RenderTargetSelector {
                    target: RenderTarget {
                        attachments: [
                            RenderAttachment {
                                name: "depth"
                                type: RenderAttachment.DepthAttachment
                                texture: Texture2D {
                                    id: depthTexture
                                    width: mainview.width
                                    height: mainview.height
                                    format: Texture.D24
                                    generateMipMaps: false
                                    magnificationFilter: Texture.Linear
                                    minificationFilter: Texture.Linear
                                    wrapMode {
                                        x: WrapMode.ClampToEdge
                                        y: WrapMode.ClampToEdge
                                    }
                                    comparisonFunction: Texture.CompareLessEqual
                                    comparisonMode: Texture.CompareRefToTexture
                                }
                            }
                        ]
                    }

                    ClearBuffer {
                        buffers: ClearBuffer.DepthBuffer

                        CameraSelector {
                            id: lightCameraSelector
                        }
                    }
                }
            }
        }

        RenderPassFilter {
            includes: [ Annotation { name: "pass"; value: "forward" } ]

            ClearBuffer {
                buffers: ClearBuffer.ColorDepthBuffer

                CameraSelector {
                    id: viewCameraSelector
                }
            }
        }
    }
}