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| ** Copyright (C) 2019 Klaralvdalens Datakonsult AB (KDAB). |
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| |
| import Qt3D.Core 2.14 |
| import Qt3D.Render 2.14 |
| import Qt3D.Extras 2.14 |
| import Qt3D.Input 2.14 |
| |
| Entity { |
| |
| property alias computeMode: particlesComputeJob.runType |
| |
| function triggerCompute(frames) { |
| particlesComputeJob.trigger(frames) |
| } |
| |
| components: [ |
| RenderSettings { |
| ComputeFrameGraph { |
| camera: sceneCamera |
| } |
| // explicitly set RenderingPolicy to AlwaysRender, as changes in the |
| // scene won't be reflected in actual Qt scene-graph changes (due to |
| // GPU compute calls) |
| renderPolicy: RenderSettings.Always |
| }, |
| InputSettings {} |
| ] |
| |
| FirstPersonCameraController { camera: sceneCamera } |
| |
| Camera { |
| id: sceneCamera |
| projectionType: CameraLens.PerspectiveProjection |
| viewCenter: Qt.vector3d(0, 0, 0) |
| position: Qt.vector3d(0, 20, -800) |
| nearPlane: 0.1 |
| farPlane: 1000 |
| fieldOfView: 60 |
| } |
| |
| property int particlesCount: 1024 * 1024 |
| readonly property int floatSize: 4 |
| |
| function buildParticlesBuffer() { |
| var byteSizeOfParticleData = 8; |
| var bufferData = new Float32Array(particlesCount * byteSizeOfParticleData); |
| for (var x = 0; x < 1024; ++x) { |
| for (var z = 0; z < 1024; ++z) { |
| var i = x * 1024 + z; |
| var positionIdx = i * byteSizeOfParticleData; |
| var colorIdx = i * byteSizeOfParticleData + 8; |
| |
| bufferData[positionIdx] = -1024 + x * 2; |
| bufferData[positionIdx + 1] = 0; |
| bufferData[positionIdx + 2] = -1024 + z * 2; |
| bufferData[positionIdx + 3] = 1.0; |
| |
| bufferData[colorIdx] = 0.25 + Math.sin(x / 1024) * 0.75; |
| bufferData[colorIdx + 1] = 0.25 + Math.sin(z / 1024) * 0.75; |
| bufferData[colorIdx + 2] = 0.25 + Math.sin(x / 1024) * 0.75; |
| bufferData[colorIdx + 3] = 1.0; |
| } |
| } |
| return bufferData |
| } |
| |
| Buffer { |
| id: particleBuffer |
| type: Buffer.VertexBuffer |
| // struct ParticleData |
| // { |
| // vec3 position; // Aligned to 4 floats |
| // vec3 color; // Aligned to 4 floats |
| // }; |
| data: buildParticlesBuffer() |
| } |
| |
| Attribute { |
| id: particlePositionDataAttribute |
| name: "particlePosition" |
| attributeType: Attribute.VertexAttribute |
| vertexBaseType: Attribute.Float |
| vertexSize: 3 |
| divisor: 1 |
| byteStride: 8 * floatSize |
| buffer: particleBuffer |
| } |
| |
| Attribute { |
| id: particleColorDataAttribute |
| name: "particleColor" |
| attributeType: Attribute.VertexAttribute |
| vertexBaseType: Attribute.Float |
| vertexSize: 3 |
| divisor: 1 |
| byteOffset: 4 * floatSize |
| byteStride: 8 * floatSize |
| buffer: particleBuffer |
| } |
| |
| ComputeMaterial { |
| id: computeMaterial |
| dataBuffer: particleBuffer |
| } |
| |
| ComputeCommand { |
| id: particlesComputeJob |
| onRunTypeChanged: { |
| // Don't forget to re-enable the command |
| // when switching back to continuous |
| if (runType === ComputeCommand.Continuous) |
| enabled = true |
| } |
| } |
| |
| Entity { |
| id: particleComputeEntity |
| components: [ |
| particlesComputeJob, |
| computeMaterial |
| ] |
| } |
| |
| SphereGeometry { |
| id: sphereGeometry |
| rings: 10 |
| slices: 10 |
| radius: 1 |
| // Additional Attributes |
| attributes: [ |
| particlePositionDataAttribute, |
| particleColorDataAttribute |
| ] |
| } |
| |
| Entity { |
| id: particleRenderEntity |
| readonly property GeometryRenderer particlesRenderer: GeometryRenderer { |
| instanceCount: particlesCount |
| indexOffset: 0 |
| firstInstance: 0 |
| primitiveType: GeometryRenderer.Triangles |
| geometry: sphereGeometry |
| } |
| |
| components: [ |
| particlesRenderer, |
| computeMaterial |
| ] |
| } |
| } |
| |