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    use crate::canvas::{CanvasTextureHandle, CanvasImageHandle};
    use vulkano::image::{ImmutableImage, AttachmentImage};
    use std::sync::Arc;
    use vulkano::format::Format;
    use crate::canvas_shader::CanvasShader;
    use vulkano::sampler::Sampler;
    use vulkano::descriptor::DescriptorSet;
    use vulkano::descriptor::descriptor_set::PersistentDescriptorSet;

    #[derive(Clone)]
    pub struct CanvasTexture {
        pub(crate) handle: Arc<CanvasTextureHandle>,
        pub(crate) buffer: Arc<ImmutableImage<Format>>,
        pub(crate) name: String,
        pub(crate) size: (u32, u32),
    }

    impl CanvasTexture {
        pub fn get_descriptor_set(&self,
                              shader: Arc<CanvasShader>,
                              sampler: Arc<Sampler>) -> Box<dyn DescriptorSet + Send + Sync> {
            let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
                PersistentDescriptorSet::start(
                    shader.clone().get_pipeline().clone(), 0,
                )
                    .add_sampled_image(self.buffer.clone(), sampler.clone()).unwrap()
                    .build().unwrap());
            o
        }
    }

    #[derive(Clone)]
    pub struct CanvasImage {
        pub(crate) handle: Arc<CanvasImageHandle>,
        pub(crate) buffer: Arc<AttachmentImage>,
        pub(crate) size: (u32, u32),
    }

    impl CanvasImage {
        pub fn get_descriptor_set(&self, shader: Arc<CanvasShader>)
                              -> Box<dyn DescriptorSet + Send + Sync> {
            let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
                PersistentDescriptorSet::start(
                    shader.clone().get_pipeline().clone(), 0,
                )
                    .add_image(self.buffer.clone()).unwrap()
                    .build().unwrap());
            o
        }
    }

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