librashader-cli 0.11.2

RetroArch shaders for all.
Documentation 
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use anyhow::anyhow;
use ash::vk;
use std::ffi::CStr;

pub struct QueueFamilyIndices {
    graphics_family: Option<u32>,
}

impl QueueFamilyIndices {
    pub fn is_complete(&self) -> bool {
        self.graphics_family.is_some()
    }

    pub fn graphics_family(&self) -> anyhow::Result<u32> {
        self.graphics_family
            .ok_or(anyhow!("The queue family is not complete"))
    }
}

pub(crate) fn pick_physical_device(instance: &ash::Instance) -> anyhow::Result<vk::PhysicalDevice> {
    let physical_devices = unsafe { instance.enumerate_physical_devices()? };

    let mut result = None;
    for &physical_device in physical_devices.iter() {
        if is_physical_device_suitable(instance, physical_device) && result.is_none() {
            result = Some(physical_device)
        }
    }

    result.ok_or(anyhow!("Failed to find a suitable GPU"))
}

fn is_physical_device_suitable(
    instance: &ash::Instance,
    physical_device: vk::PhysicalDevice,
) -> bool {
    let device_properties = unsafe { instance.get_physical_device_properties(physical_device) };
    let device_features = unsafe { instance.get_physical_device_features(physical_device) };
    let device_queue_families =
        unsafe { instance.get_physical_device_queue_family_properties(physical_device) };

    if cfg!(feature = "vulkan-debug") {
        let device_type = match device_properties.device_type {
            vk::PhysicalDeviceType::CPU => "Cpu",
            vk::PhysicalDeviceType::INTEGRATED_GPU => "Integrated GPU",
            vk::PhysicalDeviceType::DISCRETE_GPU => "Discrete GPU",
            vk::PhysicalDeviceType::VIRTUAL_GPU => "Virtual GPU",
            vk::PhysicalDeviceType::OTHER => "Unknown",
            _ => panic!(),
        };

        let device_name = unsafe { CStr::from_ptr(device_properties.device_name.as_ptr()) };

        let device_name = device_name.to_string_lossy();
        println!(
            "\tDevice Name: {}, id: {}, type: {}",
            device_name, device_properties.device_id, device_type
        );

        println!("\tAPI Version: {}", device_properties.api_version);

        println!("\tSupport Queue Family: {}", device_queue_families.len());
        println!("\t\tQueue Count | Graphics, Compute, Transfer, Sparse Binding");
        for queue_family in device_queue_families.iter() {
            let is_graphics_support = if queue_family.queue_flags.contains(vk::QueueFlags::GRAPHICS)
            {
                "support"
            } else {
                "unsupport"
            };
            let is_compute_support = if queue_family.queue_flags.contains(vk::QueueFlags::COMPUTE) {
                "support"
            } else {
                "unsupport"
            };
            let is_transfer_support = if queue_family.queue_flags.contains(vk::QueueFlags::TRANSFER)
            {
                "support"
            } else {
                "unsupport"
            };
            let is_sparse_support = if queue_family
                .queue_flags
                .contains(vk::QueueFlags::SPARSE_BINDING)
            {
                "support"
            } else {
                "unsupport"
            };

            println!(
                "\t\t{}\t    | {},  {},  {},  {}",
                queue_family.queue_count,
                is_graphics_support,
                is_compute_support,
                is_transfer_support,
                is_sparse_support
            );
        }

        // there are plenty of features
        println!(
            "\tGeometry Shader support: {}",
            if device_features.geometry_shader == 1 {
                "support"
            } else {
                "unsupported"
            }
        );
    }

    let indices = find_queue_family(instance, physical_device);

    indices.is_complete()
}

pub fn find_queue_family(
    instance: &ash::Instance,
    physical_device: vk::PhysicalDevice,
) -> QueueFamilyIndices {
    let queue_families =
        unsafe { instance.get_physical_device_queue_family_properties(physical_device) };

    let mut queue_family_indices = QueueFamilyIndices {
        graphics_family: None,
    };

    let mut index = 0;
    for queue_family in queue_families.iter() {
        if queue_family.queue_count > 0
            && queue_family.queue_flags.contains(vk::QueueFlags::GRAPHICS)
        {
            queue_family_indices.graphics_family = Some(index);
        }

        if queue_family_indices.is_complete() {
            break;
        }

        index += 1;
    }

    queue_family_indices
}