1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

use super::{
    device::{RawDevice, VkDevice},
    renderpass_and_pipeline::VkRenderPass,
};
use ash::{extensions::khr::Swapchain, prelude::VkResult, vk};
use std::sync::Arc;

pub struct VkSwapchain {
    pub swapchain: vk::SwapchainKHR,
    pub swapchain_loader: Swapchain,
    pub images: Vec<vk::Image>,
    pub image_views: Vec<vk::ImageView>,
    pub format: vk::Format,
    pub info: vk::SwapchainCreateInfoKHR,
    pub device: Arc<RawDevice>,
}

impl VkSwapchain {
    pub fn format(&self) -> vk::Format {
        self.format
    }

    pub fn recreate_swapchain(
        &mut self,
        (width, height): (u32, u32),
        device: &VkDevice,
    ) -> VkResult<()> {
        self.info.image_extent = vk::Extent2D { width, height };
        // I have to destroy old swapchaing to be able switch between
        // different backends
        //
        // self.info.old_swapchain = self.swapchain;
        unsafe {
            self.swapchain_loader
                .destroy_swapchain(self.swapchain, None);
        }
        for &image_view in self.image_views.iter() {
            unsafe { self.device.destroy_image_view(image_view, None) };
        }

        self.swapchain = unsafe { self.swapchain_loader.create_swapchain(&self.info, None) }?;
        self.images = unsafe { self.swapchain_loader.get_swapchain_images(self.swapchain)? };
        self.image_views = Self::create_image_views(&self.images, self.info.image_format, device)?;

        Ok(())
    }

    pub fn create_image_views(
        images: &[vk::Image],
        format: vk::Format,
        device: &VkDevice,
    ) -> VkResult<Vec<vk::ImageView>> {
        images
            .iter()
            .map(|&image| {
                let create_view_info = vk::ImageViewCreateInfo::builder()
                    .view_type(vk::ImageViewType::TYPE_2D)
                    .format(format)
                    .components(vk::ComponentMapping {
                        // Why not BGRA?
                        r: vk::ComponentSwizzle::R,
                        g: vk::ComponentSwizzle::G,
                        b: vk::ComponentSwizzle::B,
                        a: vk::ComponentSwizzle::A,
                    })
                    .subresource_range(vk::ImageSubresourceRange {
                        aspect_mask: vk::ImageAspectFlags::COLOR,
                        base_mip_level: 0,
                        level_count: 1,
                        base_array_layer: 0,
                        layer_count: 1,
                    })
                    .image(image);
                unsafe { device.create_image_view(&create_view_info, None) }
            })
            .collect::<VkResult<Vec<_>>>()
    }

    pub fn create_framebuffers(
        &self,
        (width, height): (u32, u32),
        render_pass: &VkRenderPass,
        device: &VkDevice,
    ) -> VkResult<Vec<vk::Framebuffer>> {
        self.image_views
            .iter()
            .map(|&present_image_view| {
                Self::create_framebuffer(
                    &[present_image_view],
                    (width, height),
                    render_pass,
                    device,
                )
            })
            .collect()
    }

    pub fn create_framebuffer(
        image_views: &[vk::ImageView],
        (width, height): (u32, u32),
        render_pass: &VkRenderPass,
        device: &VkDevice,
    ) -> VkResult<vk::Framebuffer> {
        let framebuffer_attachments = image_views;
        unsafe {
            device.create_framebuffer(
                &vk::FramebufferCreateInfo::builder()
                    .render_pass(render_pass.render_pass)
                    .attachments(framebuffer_attachments)
                    .width(width)
                    .height(height)
                    .layers(1),
                None,
            )
        }
    }
}

impl Drop for VkSwapchain {
    fn drop(&mut self) {
        unsafe {
            for &image_view in self.image_views.iter() {
                self.device.destroy_image_view(image_view, None);
            }
            self.swapchain_loader
                .destroy_swapchain(self.swapchain, None)
        };
    }
}