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use std::sync::Arc;
use crate::canvas::managed::handles::{CanvasImageHandle};
use crate::compute::managed::handles::{CompuKernelHandle, CompuBufferHandle};
use crate::drawables::compu_sprite::CompuSprite;
use crate::canvas::canvas_frame::Drawable;
use crate::util::vertex::VertexTypes;

pub struct CompuFrame {
    // Vec<(Buffer, Kernel)>
    pub pure_compute: Vec<(
        Arc<CompuBufferHandle>,
        Arc<CompuKernelHandle>)>,

    // Vec<(Buffer, Image, Kernel)>
    pub swapped_to_image: Vec<(
        Arc<CompuBufferHandle>,
        Arc<CanvasImageHandle>,
        Arc<CompuKernelHandle>)>,

    // Vec<(Input Buffer, Output Buffer, Kernel)>
    pub swapped_to_buffer: Vec<(
        Arc<CompuBufferHandle>,
        Arc<CompuBufferHandle>,
        Arc<CompuKernelHandle>)>,
}

impl CompuFrame {
    pub fn new() -> CompuFrame {
        CompuFrame {
            pure_compute: vec![],
            swapped_to_image: vec![],
            swapped_to_buffer: vec![],
        }
    }

    pub fn add(&mut self, buffer: Arc<CompuBufferHandle>, kernel: Arc<CompuKernelHandle>) {
        self.pure_compute.push((buffer, kernel));
    }

    /*
       INPUT_BUFFER -> input -> kernel -> output
                           v------------------^
       OUTPUT_BUFFER -> input X kernel X output
    */
    pub fn add_chained(&mut self,
                       input_buffer: Arc<CompuBufferHandle>,
                       output_buffer: Arc<CompuBufferHandle>,
                       kernel: Arc<CompuKernelHandle>) {
        self.swapped_to_buffer.push((input_buffer, output_buffer, kernel));
    }

    pub fn add_with_image_swap(&mut self,
                               buffer: Arc<CompuBufferHandle>,
                               kernel: Arc<CompuKernelHandle>,
                               sprite: &CompuSprite) {

        if let VertexTypes::ImageType(a, b) = sprite.get() {
            self.swapped_to_image.push((buffer, b, kernel))
        }

    }
}