Enumerate available Vulkan extensions using Zig

enumerate_extensions.zig

// Zig 0.12.0
// Vulkan 1.3.280.0

// Get the number of extensions
var extension_count: u32 = 0;
if (vk.vkEnumerateInstanceExtensionProperties(null, &extension_count, null) != vk.VK_SUCCESS) {
    std.debug.panic("Failed to retrieve instance extension count.", .{});
}

// Allocate array to hold enumerated extension properties
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const allocator = gpa.allocator();
const extension_properties = try allocator.alloc(vk.VkExtensionProperties, extension_count);
defer allocator.free(extension_properties);

// Enumerate & store extension properties
if (vk.vkEnumerateInstanceExtensionProperties(null, &extension_count, extension_properties.ptr) != vk.VK_SUCCESS) {
    std.debug.panic("Failed to enumerate instance extension properties.", .{});
}

// Print extension names
std.debug.print("VkInstance Extensions:\n", .{});
for (extension_properties) |ep| {
    const name: [*:0]const u8 = @ptrCast(&ep.extensionName);
    std.debug.print("{s}\n", .{name});
}