aluminium 0.1.0

vulkan-based graphics engine
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use ash::vk;
use bytemuck::{Pod, Zeroable};

use crate::core::{Device, VulkanResult};
use crate::per_frame::{PerFrameBuffer, PerFrameBufferBuilder};

#[repr(C)]
#[derive(Clone, Copy, Pod, Zeroable)]
pub struct FrameData {
    resolution: [u32; 2],
    frame_index: u32,
    delta_time_sec: f32,
    time_sec: f32,
    _pad: f32,
}

pub struct FrameValues {
    pub global_time_sec: std::time::Instant,
    pub delta_time_sec: std::time::Instant,
    pub buffer: PerFrameBuffer,
    pub data: FrameData,
}

impl FrameValues {
    pub fn new(device: &Device, frame_count: usize) -> VulkanResult<Self> {
        let buffer = PerFrameBufferBuilder::new(device)
            .frame_count(frame_count)
            .buffer_size(size_of::<FrameData>() as u64)
            .usage(vk::BufferUsageFlags::UNIFORM_BUFFER)
            .build()?;

        Ok(Self {
            global_time_sec: std::time::Instant::now(),
            delta_time_sec: std::time::Instant::now(),
            data: FrameData {
                resolution: [0, 0],
                frame_index: 0,
                delta_time_sec: 0.0,
                time_sec: 0.0,
                _pad: 0.0,
            },
            buffer,
        })
    }

    pub fn update(&mut self, device: &Device, image_index: u32, frame_index: u32) -> VulkanResult<()> {
        let buffer = self.buffer.get_mut(image_index);
        self.data.frame_index = frame_index;
        self.data.time_sec = self.global_time_sec.elapsed().as_secs_f32();
        self.data.delta_time_sec = self.delta_time_sec.elapsed().as_secs_f32();
        self.delta_time_sec = std::time::Instant::now();
        buffer.upload_data(device, &[self.data])?;
        Ok(())
    }
}