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    use crate::canvas::managed::handles::{CanvasTextureHandle, CanvasImageHandle, CanvasFontHandle};
    use std::sync::Arc;
    use vulkano::buffer::BufferAccess;
    use std::collections::HashMap;

    #[derive(Default, Debug, Clone, Copy)]
    pub struct TextureVertex3D {
        pub v_position: [f32; 3],
        pub ti_position: [f32; 2],
    }
    vulkano::impl_vertex!(TextureVertex3D, v_position, ti_position);

    #[derive(Default, Debug, Clone, Copy)]
    pub struct ColorVertex3D {
        pub v_position: [f32; 3],
        pub color: [f32; 4],
    }
    vulkano::impl_vertex!(ColorVertex3D, v_position, color);

    #[derive(Default, Debug, Clone, Copy)]
    pub struct ImageVertex3D {
        pub v_position: [f32; 3],
        pub ti_position: [f32; 2],
    }
    vulkano::impl_vertex!(ImageVertex3D, v_position, ti_position);

    #[derive(Default, Debug, Clone, Copy)]
    pub struct Vertex3D {
        pub v_position: [f32; 3],
        pub color   : [f32; 4],
        pub ti_position: [f32; 2],
    }
    vulkano::impl_vertex!(Vertex3D, v_position, color, ti_position);

    /// Text vertex 3d with vertex position
    #[derive(Default, Debug, Clone, Copy)]
    pub struct TextVertex3D {
        pub position: [f32; 3],
    }

    vulkano::impl_vertex!(TextVertex3D, position);

    #[derive(Default, Debug, Clone, Copy)]
    pub struct GlyphInstance {
        pub screen_position: (f32, f32),
        pub atlas_position: (f32, f32),
        pub atlas_size: (f32, f32),
        pub scale: f32,
    }
    vulkano::impl_vertex!(GlyphInstance, screen_position, atlas_position, atlas_size, scale);
    // ==============================================================================

    #[derive(Debug, Clone)]
    pub enum VertexTypes {
        TextureType(Vec<TextureVertex3D>, Arc<CanvasTextureHandle>),
        ImageType(Vec<ImageVertex3D>, Arc<CanvasImageHandle>),
        ColorType(Vec<ColorVertex3D>),
        ThreeDType(Vec<Vertex3D>),

    }

    #[derive(Clone)]
    pub struct CanvasFrameAllocation {
        pub colored_vertex_buffer: Vec<Arc<(dyn BufferAccess + Send + Sync)>>,
        pub textured_vertex_buffer: HashMap<Arc<CanvasTextureHandle>, Arc<(dyn BufferAccess + Send + Sync)>>,
        pub image_vertex_buffer: HashMap<Arc<CanvasImageHandle>, Arc<(dyn BufferAccess + Send + Sync)>>,
        pub text_instances: HashMap<Arc<CanvasFontHandle>, Arc<(dyn BufferAccess + Send + Sync)>>,
    }

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