vka 0.0.0

A minimal vulkan wrapper
Documentation 
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
130
131
132
133
134
135
136

use ash::vk;
use ash::vk::SurfaceFormatKHR;
use itertools::Itertools;

use crate::AsExtent3D;
use crate::Image;
use crate::RenderingDevice;
use crate::VkaResult;

pub struct Swapchain {
    pub handle: vk::SwapchainKHR,
    pub device: ash::khr::swapchain::Device,
    pub images: Vec<Image>,

    pub extent: vk::Extent2D,
    pub format: vk::Format,
    pub color_space: vk::ColorSpaceKHR,
    pub present_mode: vk::PresentModeKHR,

    pub present_semaphores: Vec<vk::Semaphore>,
}

fn present_mode_str(mode: vk::PresentModeKHR) -> &'static str {
    match mode {
        vk::PresentModeKHR::IMMEDIATE => "Immediate",
        vk::PresentModeKHR::MAILBOX => "Mailbox",
        vk::PresentModeKHR::FIFO => "Fifo",
        vk::PresentModeKHR::FIFO_RELAXED => "Fifo Relaxed",
        _ => "Unknown",
    }
}

pub fn make_swapchain(rd: &RenderingDevice, old_swapchain: Option<vk::SwapchainKHR>) -> VkaResult<Swapchain> {
    unsafe {
        let device = &rd.device;
        let instance = &rd.instance;
        let surface = rd.surface.as_ref().unwrap();
        let config = rd.surface_config.get();

        let device = ash::khr::swapchain::Device::new(instance, device);
        let present_modes = surface.instance.get_physical_device_surface_present_modes(rd.phy_device, surface.handle)?;
        let caps = surface.instance.get_physical_device_surface_capabilities(rd.phy_device, surface.handle)?;
        let formats = surface.instance.get_physical_device_surface_formats(rd.phy_device, surface.handle)?;

        let SurfaceFormatKHR { format, color_space } = formats
            .iter()
            .find_map(|&f| {
                if f.format == vk::Format::B8G8R8A8_UNORM && f.color_space == vk::ColorSpaceKHR::SRGB_NONLINEAR {
                    Some(f)
                } else {
                    None
                }
            })
            .unwrap_or(formats[0]);

        let present_mode = if config.vsync {
            vk::PresentModeKHR::FIFO
        } else if present_modes.contains(&vk::PresentModeKHR::MAILBOX) {
            vk::PresentModeKHR::MAILBOX
        } else if present_modes.contains(&vk::PresentModeKHR::IMMEDIATE) {
            vk::PresentModeKHR::IMMEDIATE
        } else {
            present_modes[0]
        };

        let image_count = caps.min_image_count + 1;
        let extent = vk::Extent2D {
            width: if caps.max_image_extent.width > 0 {
                config.width.clamp(caps.min_image_extent.width, caps.max_image_extent.width)
            } else {
                config.width
            },
            height: if caps.max_image_extent.height > 0 {
                config.height.clamp(caps.min_image_extent.height, caps.max_image_extent.height)
            } else {
                config.height
            },
        };
        log::info!("Creating swapchain:");
        log::info!("Available present modes: {}", present_modes.iter().map(|&m| present_mode_str(m)).join(","));
        log::info!("Selected present mode: {}", present_mode_str(present_mode));
        log::info!("Surface Format: {}", format.as_raw());
        log::info!("Framebuffer Size: {}x{}", extent.width, extent.height);

        let swapchain = device.create_swapchain(
            &vk::SwapchainCreateInfoKHR::default()
                .surface(surface.handle)
                .min_image_count(image_count)
                .image_format(format)
                .image_color_space(color_space)
                .image_extent(extent)
                .image_array_layers(1)
                .image_usage(vk::ImageUsageFlags::COLOR_ATTACHMENT)
                .image_sharing_mode(vk::SharingMode::EXCLUSIVE)
                .pre_transform(caps.current_transform)
                .composite_alpha(vk::CompositeAlphaFlagsKHR::OPAQUE)
                .present_mode(present_mode)
                .clipped(true)
                .old_swapchain(old_swapchain.unwrap_or(vk::SwapchainKHR::null())),
            None,
        )?;
        let images = device
            .get_swapchain_images(swapchain)?
            .iter()
            .enumerate()
            .map(|(j, &image)| {
                let img = rd.image_from_raw(
                    image,
                    format,
                    extent.as_extent3d(1),
                    vk::SampleCountFlags::TYPE_1,
                    vk::ImageUsageFlags::COLOR_ATTACHMENT,
                    None,
                );
                img.layout.set(vk::ImageLayout::PRESENT_SRC_KHR); // initial state for swapchain images
                img.set_name(format!("Swapchain Image {}", j));
                img
            })
            .collect_vec();

        let present_semaphores = (0..image_count)
            .map(|i| rd.device.create_semaphore(&vk::SemaphoreCreateInfo::default(), None).unwrap())
            .collect_vec();

        Ok(Swapchain {
            handle: swapchain,
            device,
            images,
            extent,
            format,
            color_space,
            present_mode,
            present_semaphores
        })
    }
}