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// Copyright (C) 2019 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import Qt3D.Core 2.14
import Qt3D.Render 2.14
import Qt3D.Input 2.0
import Qt3D.Extras 2.0
Entity {
id: sceneRoot
components: [
RenderSettings {
id : external_forward_renderer
activeFrameGraph : RenderSurfaceSelector {
Viewport {
// Launch Compute Shader Instances
DispatchCompute {
}
// Draw Textures
CameraSelector {
camera: camera
ClearBuffers { buffers: ClearBuffers.ColorDepthBuffer
// Ensure we won't be reading from textures if Compute Shader instances aren't completed
MemoryBarrier { waitFor: MemoryBarrier.ShaderImageAccess|MemoryBarrier.TextureFetch }
}
}
}
}
},
// Event Source will be set by the Qt3DQuickWindow
InputSettings { id: inputSettings }
]
Camera {
id: camera
projectionType: CameraLens.PerspectiveProjection
fieldOfView: 45
aspectRatio: 16/9
nearPlane : 0.1
farPlane : 1000.0
position: Qt.vector3d( 0.0, 0.0, 3.0 )
upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
viewCenter: Qt.vector3d( 0.0, 0.0, 0.0 )
}
Texture2D {
id: inputTexture
width: 512
height: 512
format: Texture.RGBA8_UNorm
generateMipMaps: false
magnificationFilter: Texture.Linear
minificationFilter: Texture.Linear
wrapMode {
x: WrapMode.ClampToEdge
y: WrapMode.ClampToEdge
}
// Texture image which are referencing regular image extensions (jpg, png)
// are loaded through a QImage based texture image generator which generates
// RGBA8_UNorm based content
TextureImage {
source: "qrc:/image_512x512.jpg"
mirrored: false
}
}
Texture2D {
id: outputTexture
width: 512
height: 512
format: Texture.RGBA8_UNorm
generateMipMaps: false
magnificationFilter: Texture.Linear
minificationFilter: Texture.Linear
wrapMode {
x: WrapMode.ClampToEdge
y: WrapMode.ClampToEdge
}
}
// Compute -> Generate Output Texture Content
Entity {
readonly property Material material: Material {
parameters: [
Parameter {
name: "inputImage"
value: ShaderImage {
texture: inputTexture
layer: 0 // default
layered: false // default
mipLevel: 0 // default
access: ShaderImage.ReadOnly // default is ReadWrite
format: ShaderImage.Automatic // default
}
},
Parameter {
name: "outputImage"
value: ShaderImage {
texture: outputTexture
access: ShaderImage.WriteOnly // default is ReadWrite
format: ShaderImage.RGBA8_UNorm
}
}
]
effect: Effect {
techniques: Technique {
graphicsApiFilter {
api: GraphicsApiFilter.OpenGL
profile: GraphicsApiFilter.CoreProfile
majorVersion: 4
minorVersion: 3
}
renderPasses: RenderPass {
shaderProgram: ShaderProgram {
computeShaderCode:
"#version 430
layout(local_size_x = 16, local_size_y = 16) in;
layout(rgba8) readonly uniform image2D inputImage;
layout(rgba8) writeonly uniform image2D outputImage;
uniform float time;
void main(void) {
ivec2 imageCoords = ivec2(gl_GlobalInvocationID.xy);
// Early return if we are past the image's bounds
if (any(greaterThan(imageCoords, imageSize(inputImage))))
return;
// Read from input image
vec4 inputContent = imageLoad(inputImage, imageCoords);
// Store inputContent into output Image
imageStore(outputImage, imageCoords, inputContent * abs(sin(time)));
}"
}
}
}
}
}
readonly property ComputeCommand command: ComputeCommand {
readonly property int localWorkGroupSize: 16
workGroupX: Math.ceil(inputTexture.width / localWorkGroupSize)
workGroupY: Math.ceil(inputTexture.height / localWorkGroupSize)
}
components: [command, material]
}
// Preview Texture Scene
Entity {
PlaneMesh {
id: planeMesh
}
components: Transform {
rotationX: 90
}
Entity {
id: inputTexturePreview
readonly property Material material: TextureMaterial {
texture: inputTexture
}
readonly property Transform transform: Transform {
translation: Qt.vector3d(-1, 0, 0)
}
components: [planeMesh, material, transform]
}
Entity {
id: outputTexturePreview
readonly property Material material: TextureMaterial {
texture: outputTexture
}
readonly property Transform transform: Transform {
translation: Qt.vector3d(1, 0, 0)
}
components: [planeMesh, material, transform]
}
}
}
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