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// Copyright (C) 2015 Paul Lemire
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
import Qt3D.Core 2.0
import Qt3D.Render 2.0
Viewport {
id: root
property alias camera: cameraSelector.camera
property alias window: surfaceSelector.surface
property alias clearColor: clearBuffer.clearColor
readonly property Layer contentLayer: Layer {}
readonly property Layer visualizationLayer: Layer {}
readonly property Layer capsLayer: Layer {}
RenderSurfaceSelector {
id: surfaceSelector
CameraSelector {
id: cameraSelector
RenderStateSet {
// Enable 3 clipping planes
renderStates: [
ClipPlane { planeIndex: 0 },
ClipPlane { planeIndex: 1 },
ClipPlane { planeIndex: 2 },
DepthTest { depthFunction: DepthTest.LessOrEqual }
]
// Branch 1
LayerFilter {
// Render entities with their regular material
// Fills depth buffer for entities that are clipped
layers: [root.contentLayer, root.visualizationLayer]
ClearBuffers {
id: clearBuffer
buffers: ClearBuffers.ColorDepthBuffer
RenderPassFilter {
matchAny: FilterKey { name: "pass"; value: "material" }
}
}
}
// Branch 2
ClearBuffers {
// Enable and fill Stencil to later generate caps
buffers: ClearBuffers.StencilBuffer
RenderStateSet {
// Disable depth culling
// Incr for back faces
// Decr for front faces
// No need to output color values
renderStates: [
StencilTest {
front {
stencilFunction: StencilTestArguments.Always
referenceValue: 0; comparisonMask: 0
}
back {
stencilFunction: StencilTestArguments.Always
referenceValue: 0; comparisonMask: 0
}
},
StencilOperation {
front.allTestsPassOperation: StencilOperationArguments.Decrement
back.allTestsPassOperation: StencilOperationArguments.Increment
},
ColorMask { redMasked: false; greenMasked: false; blueMasked: false; alphaMasked: false }
]
LayerFilter {
layers: root.contentLayer
RenderPassFilter {
matchAny: FilterKey { name: "pass"; value: "stencilFill"; }
}
}
}
}
}
// Branch 3
RenderStateSet {
// Draw caps using stencil buffer
LayerFilter {
layers: root.capsLayer
RenderPassFilter {
matchAny: FilterKey { name: "pass"; value: "capping"; }
}
}
// Draw back faces - front faces -> caps
renderStates: [
StencilTest {
front {
stencilFunction: StencilTestArguments.NotEqual
referenceValue: 0; comparisonMask: ~0
}
back {
stencilFunction: StencilTestArguments.NotEqual
referenceValue: 0; comparisonMask: ~0
}
}
]
}
}
}
}
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