Qt Quick 3D - Custom Shaders Example

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 import QtQuick
 import QtQuick3D

 CustomMaterial {
     property real time: 0.0
     property real amplitude: 5.0
     property real alpha: 1.0

     property bool texturing: false
     property bool textureFromItem: false
     property Item texSrc
     Texture {
         id: texFromFile
         source: "qt_logo.png"
     }
     Texture {
         id: texFromItem
         sourceItem: texSrc
     }
     property TextureInput tex: TextureInput {
         enabled: texturing
         texture: textureFromItem ? texFromItem : texFromFile
     }

     shadingMode: CustomMaterial.Unshaded
     sourceBlend: alpha < 1.0 ? CustomMaterial.SrcAlpha : CustomMaterial.NoBlend
     destinationBlend: alpha < 1.0 ? CustomMaterial.OneMinusSrcAlpha : CustomMaterial.NoBlend
     cullMode: CustomMaterial.BackFaceCulling

     vertexShader: "example.vert"
     fragmentShader: texturing ? "example_tex.frag" : "example.frag"
 }