Enumerate available Vulkan physical devices in Zig

enumerate_physical_devices.zig

// Zig 0.12.0
// Vulkan 1.3.280.0

// Get device count
var physical_device_count: u32 = 0;
if (vk.vkEnumeratePhysicalDevices(instance, &physical_device_count, null) != vk.VK_SUCCESS) {
    std.debug.panic("Failed to get number of physical devices.", .{});
}

// Populate physical devices array
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const allocator = gpa.allocator();
const physical_devices = try allocator.alloc(vk.VkPhysicalDevice, physical_device_count);
if (vk.vkEnumeratePhysicalDevices(instance, &physical_device_count, physical_devices.ptr) != vk.VK_SUCCESS) {
    std.debug.panic("Failed to populate list of physical devices.", .{});
}

// Loop over each device and fill the device_properties struct
var device_properties = try allocator.create(vk.VkPhysicalDeviceProperties);
defer allocator.destroy(device_properties);
for (0.., physical_devices) |i, d| {
    vk.vkGetPhysicalDeviceProperties(d, device_properties);
    const device_name: [*:0]const u8 = @ptrCast(&device_properties.deviceName);
    std.debug.print("\n{d}: {s}\n", .{i, device_name});
}