pre vertex buffer

src/main.rs

@@ -0,0 +1,723 @@
+#![allow(
+    dead_code,
+    unused_variables,
+    clippy::too_many_arguments,
+    clippy::unnecessary_wraps
+)]
+
+use anyhow::{anyhow, Result};
+use log::*;
+use winit::dpi::LogicalSize;
+use winit::event::{Event, WindowEvent};
+use winit::event_loop::EventLoop;
+use winit::window::{Window, WindowBuilder};
+
+use vulkanalia::loader::{LibloadingLoader, LIBRARY};
+use vulkanalia::window as vk_window;
+use vulkanalia::prelude::v1_0::*;
+use vulkanalia::Version;
+use vulkanalia::bytecode::Bytecode;
+
+use std::collections::HashSet;
+use std::ffi::CStr;
+use std::os::raw::c_void;
+
+// extension imports
+use vulkanalia::vk::ExtDebugUtilsExtension;
+use vulkanalia::vk::KhrSurfaceExtension;
+use vulkanalia::vk::KhrSwapchainExtension;
+
+pub mod app_data;
+pub mod errors;
+pub mod swapchain;
+pub mod queue_family_indices;
+
+const PORTABILITY_MACOS_VERSION: Version = Version::new(1, 3, 216);
+const VALIDATION_ENABLED: bool =
+    cfg!(debug_assertions);
+
+const VALIDATION_LAYER: vk::ExtensionName =
+    vk::ExtensionName::from_bytes(b"VK_LAYER_KHRONOS_validation");
+const DEVICE_EXTENSIONS: &[vk::ExtensionName] = &[vk::KHR_SWAPCHAIN_EXTENSION.name];
+
+const MAX_FRAMES_IN_FLIGHT: usize = 2;
+
+fn main() -> Result<()> {
+    pretty_env_logger::init();
+
+    // Window
+
+    let event_loop = EventLoop::new()?;
+    let window = WindowBuilder::new()
+        .with_title("Vulkan Tutorial (Rust)")
+        .with_inner_size(LogicalSize::new(1024, 768))
+        .build(&event_loop)?;
+
+    // App
+
+    let mut app = unsafe { App::create(&window)? };
+    event_loop.run(move |event, elwt| {
+        match event {
+            // Request a redraw when all events were processed.
+            Event::AboutToWait => window.request_redraw(),
+            Event::WindowEvent { event, .. } => match event {
+                // Render a frame if our Vulkan app is not being destroyed.
+                WindowEvent::RedrawRequested if !elwt.exiting() && !app.minimized => unsafe { app.render(&window) }.unwrap(),
+                // Destroy our Vulkan app.
+                WindowEvent::CloseRequested => {
+                    elwt.exit();
+                    unsafe { app.device.device_wait_idle().unwrap(); }
+                    unsafe { app.destroy(); }
+                },
+                WindowEvent::Resized(size) => {
+                    if size.width == 0 || size.height == 0 {
+                        app.minimized = true;
+                    } else {
+                        app.minimized = false;
+                        app.resized = true;
+                    }
+                }
+                _ => {}
+            }
+            _ => {}
+        }
+    })?;
+
+    Ok(())
+}
+
+/// Our Vulkan app.
+#[derive(Clone, Debug)]
+struct App {
+    entry: Entry,
+    instance: Instance,
+    data: app_data::AppData,
+    device: Device,
+    frame: usize,
+    resized: bool,
+    minimized: bool,
+}
+
+impl App {
+    /// Creates our Vulkan app.
+    unsafe fn create(window: &Window) -> Result<Self> {
+        let loader = LibloadingLoader::new(LIBRARY)?;
+        let entry = Entry::new(loader).map_err(|b| anyhow!("{}", b))?;
+        let mut data = app_data::AppData::default();
+        let instance = create_instance(window, &entry, &mut data)?;
+        data.surface = vk_window::create_surface(&instance, &window, &window)?;
+        pick_physical_device(&instance, &mut data)?;
+        let device = create_logical_device(&entry, &instance, &mut data)?;
+        swapchain::create_swapchain(window, &instance, &device, &mut data)?;
+        swapchain::create_swapchain_image_views(&device, &mut data)?;
+        create_render_pass(&instance, &device, &mut data)?;
+        
+        create_pipeline(&device, &mut data)?;
+        
+        create_framebuffers(&device, &mut data)?;
+
+        create_command_pool(&instance, &device, &mut data)?;
+
+        create_command_buffers(&device, &mut data)?;
+
+        create_sync_objects(&device, &mut data)?;
+
+        Ok(Self { entry, instance, data, device, frame: 0 , resized: false, minimized: false})
+    }
+
+    /// Renders a frame for our Vulkan app.
+    unsafe fn render(&mut self, window: &Window) -> Result<()> {
+        let in_flight_fence = self.data.in_flight_fences[self.frame];
+
+        self.device.wait_for_fences(&[in_flight_fence], true, u64::MAX)?;
+
+        let result = self.device.acquire_next_image_khr(
+            self.data.swapchain,
+            u64::MAX,
+            self.data.image_available_semaphores[self.frame],
+            vk::Fence::null(),
+        );
+
+        let image_index = match result {
+            Ok((image_index, _)) => image_index as usize,
+            Err(vk::ErrorCode::OUT_OF_DATE_KHR) => return self.recreate_swapchain(window),
+            Err(e) => return Err(anyhow!(e)),
+        };
+
+        let image_in_flight = self.data.images_in_flight[image_index];
+        if !image_in_flight.is_null() {
+            self.device.wait_for_fences(&[image_in_flight], true, u64::MAX)?;
+        }
+
+        self.data.images_in_flight[image_index] = in_flight_fence;
+
+        let wait_semaphores = &[self.data.image_available_semaphores[self.frame]];
+        let wait_stages = &[vk::PipelineStageFlags::COLOR_ATTACHMENT_OUTPUT];
+        let command_buffers = &[self.data.command_buffers[image_index]];
+        let signal_semaphores = &[self.data.render_finished_semaphores[self.frame]];
+        let submit_info = vk::SubmitInfo::builder()
+            .wait_semaphores(wait_semaphores)
+            .wait_dst_stage_mask(wait_stages)
+            .command_buffers(command_buffers)
+            .signal_semaphores(signal_semaphores);
+
+        self.device.reset_fences(&[in_flight_fence])?;
+
+        self.device
+            .queue_submit(self.data.graphics_queue, &[submit_info], in_flight_fence)?;
+
+        let swapchains = &[self.data.swapchain];
+        let image_indices = &[image_index as u32];
+        let present_info = vk::PresentInfoKHR::builder()
+            .wait_semaphores(signal_semaphores)
+            .swapchains(swapchains)
+            .image_indices(image_indices);
+
+        let result = self.device.queue_present_khr(self.data.present_queue, &present_info);
+        let changed = result == Ok(vk::SuccessCode::SUBOPTIMAL_KHR) || result == Err(vk::ErrorCode::OUT_OF_DATE_KHR);
+        if self.resized || changed {
+            self.resized = false;
+            self.recreate_swapchain(window)?;
+        } else if let Err(e) = result {
+            return Err(anyhow!(e));
+        }
+
+        self.frame = (self.frame + 1) % MAX_FRAMES_IN_FLIGHT;
+
+        Ok(())
+    }
+
+    /// Destroys our Vulkan app.
+    unsafe fn destroy(&mut self) {
+        self.destroy_swapchain();
+
+        self.data.in_flight_fences
+            .iter()
+            .for_each(|f| self.device.destroy_fence(*f, None));
+        self.data.render_finished_semaphores
+            .iter()
+            .for_each(|s| self.device.destroy_semaphore(*s, None));
+        self.data.image_available_semaphores
+            .iter()
+            .for_each(|s| self.device.destroy_semaphore(*s, None));
+        self.device.destroy_command_pool(self.data.command_pool, None);
+        self.device.destroy_device(None);
+        self.instance.destroy_surface_khr(self.data.surface, None);
+
+        if VALIDATION_ENABLED {
+            self.instance.destroy_debug_utils_messenger_ext(self.data.messenger, None);
+        }
+
+        self.instance.destroy_instance(None);
+    }
+
+    unsafe fn recreate_swapchain(&mut self, window: &Window) -> Result<()> {
+        self.device.device_wait_idle()?;
+        self.destroy_swapchain();
+        swapchain::create_swapchain(window, &self.instance, &self.device, &mut self.data)?;
+        swapchain::create_swapchain_image_views(&self.device, &mut self.data)?;
+        create_render_pass(&self.instance, &self.device, &mut self.data)?;
+        create_pipeline(&self.device, &mut self.data)?;
+        create_framebuffers(&self.device, &mut self.data)?;
+        create_command_buffers(&self.device, &mut self.data)?;
+        self.data
+            .images_in_flight
+            .resize(self.data.swapchain_images.len(), vk::Fence::null());
+        Ok(())
+    }
+
+    unsafe fn destroy_swapchain(&mut self) {
+        self.data.framebuffers
+            .iter()
+            .for_each(|f| self.device.destroy_framebuffer(*f, None));
+        self.device.free_command_buffers(self.data.command_pool, &self.data.command_buffers);
+        self.device.destroy_pipeline(self.data.pipeline, None);
+        self.device.destroy_pipeline_layout(self.data.pipeline_layout, None);
+        self.device.destroy_render_pass(self.data.render_pass, None);
+        self.data.swapchain_image_views
+            .iter()
+            .for_each(|v| self.device.destroy_image_view(*v, None));
+        self.device.destroy_swapchain_khr(self.data.swapchain, None);
+
+    }
+}
+
+//================================================
+// Instance
+//================================================
+
+unsafe fn create_instance(window: &Window, entry: &Entry, data: &mut app_data::AppData) -> Result<Instance> {
+    let application_info = vk::ApplicationInfo::builder()
+        .application_name(b"Vulkan Tutorial\0")
+        .application_version(vk::make_version(1, 0, 0))
+        .engine_name(b"No Engine\0")
+        .engine_version(vk::make_version(1, 0, 0))
+        .api_version(vk::make_version(1, 0, 0));
+
+    // Validation layers
+
+    let available_layers = entry
+        .enumerate_instance_layer_properties()?
+        .iter()
+        .map(|l| l.layer_name)
+        .collect::<HashSet<_>>();
+
+    if VALIDATION_ENABLED && !available_layers.contains(&VALIDATION_LAYER) {
+        return Err(anyhow!("Validation layer requested but not supported."));
+    }
+
+    let layers = if VALIDATION_ENABLED {
+        vec![VALIDATION_LAYER.as_ptr()]
+    } else {
+        Vec::new()
+    };
+
+    // Extension
+    let mut extensions = vk_window::get_required_instance_extensions(window)
+        .iter()
+        .map(|e| e.as_ptr())
+        .collect::<Vec<_>>();
+
+    if VALIDATION_ENABLED {
+        extensions.push(vk::EXT_DEBUG_UTILS_EXTENSION.name.as_ptr());
+    }
+
+    // Required by Vulkan SDK on macOS since 1.3.216.
+    let flags = if 
+        cfg!(target_os = "macos") && 
+        entry.version()? >= PORTABILITY_MACOS_VERSION
+    {
+        info!("Enabling extensions for macOS portability.");
+        extensions.push(vk::KHR_GET_PHYSICAL_DEVICE_PROPERTIES2_EXTENSION.name.as_ptr());
+        extensions.push(vk::KHR_PORTABILITY_ENUMERATION_EXTENSION.name.as_ptr());
+        vk::InstanceCreateFlags::ENUMERATE_PORTABILITY_KHR
+    } else {
+        vk::InstanceCreateFlags::empty()
+    };
+
+    let mut info = vk::InstanceCreateInfo::builder()
+    .application_info(&application_info)
+    .enabled_layer_names(&layers)
+    .enabled_extension_names(&extensions)
+    .flags(flags);
+
+    let mut debug_info = vk::DebugUtilsMessengerCreateInfoEXT::builder()
+        .message_severity(vk::DebugUtilsMessageSeverityFlagsEXT::all())
+        .message_type(vk::DebugUtilsMessageTypeFlagsEXT::all())
+        .user_callback(Some(debug_callback));
+
+    if VALIDATION_ENABLED {
+        info = info.push_next(&mut debug_info);
+    }
+    
+    let instance = entry.create_instance(&info, None)?;
+
+    if VALIDATION_ENABLED {
+        data.messenger = instance.create_debug_utils_messenger_ext(&debug_info, None)?;
+    }
+
+    Ok(instance)
+}
+
+extern "system" fn debug_callback(
+    severity: vk::DebugUtilsMessageSeverityFlagsEXT,
+    type_: vk::DebugUtilsMessageTypeFlagsEXT,
+    data: *const vk::DebugUtilsMessengerCallbackDataEXT,
+    _: *mut c_void,
+) -> vk::Bool32 {
+    let data = unsafe { *data };
+    let message = unsafe { CStr::from_ptr(data.message) }.to_string_lossy();
+
+    if severity >= vk::DebugUtilsMessageSeverityFlagsEXT::ERROR {
+        error!("({:?}) {}", type_, message);
+    } else if severity >= vk::DebugUtilsMessageSeverityFlagsEXT::WARNING {
+        warn!("({:?}) {}", type_, message);
+    } else if severity >= vk::DebugUtilsMessageSeverityFlagsEXT::INFO {
+        debug!("({:?}) {}", type_, message);
+    } else {
+        trace!("({:?}) {}", type_, message);
+    }
+
+    vk::FALSE
+}
+
+unsafe fn pick_physical_device(instance: &Instance, data: &mut app_data::AppData) -> Result<()> {
+    for physical_device in instance.enumerate_physical_devices()? {
+        let properties = instance.get_physical_device_properties(physical_device);
+
+        if let Err(error) = check_physical_device(instance, data, physical_device) {
+            warn!("Skipping physical device (`{}`): {}", properties.device_name, error);
+        } else {
+            info!("Selected physical device (`{}`).", properties.device_name);
+            data.physical_device = physical_device;
+            return Ok(());
+        }
+    }
+
+    Err(anyhow!("Failed to find suitable physical device."))
+}
+
+unsafe fn check_physical_device(
+    instance: &Instance,
+    data: &app_data::AppData,
+    physical_device: vk::PhysicalDevice,
+) -> Result<()> {
+    let properties = instance.get_physical_device_properties(physical_device);
+    if properties.device_type != vk::PhysicalDeviceType::DISCRETE_GPU {
+        return Err(anyhow!(errors::SuitabilityError("Only discrete GPUs are supported.")));
+    }
+
+    let features = instance.get_physical_device_features(physical_device);
+    if features.geometry_shader != vk::TRUE {
+        return Err(anyhow!(errors::SuitabilityError("Missing geometry shader support.")));
+    }
+
+    queue_family_indices::QueueFamilyIndices::get(instance, data, physical_device)?;
+    check_physical_device_extensions(instance, physical_device)?;
+
+    let support = swapchain::SwapchainSupport::get(instance, data, physical_device)?;
+    if support.formats.is_empty() || support.present_modes.is_empty() {
+        return Err(anyhow!(errors::SuitabilityError("Insufficient swapchain support.")));
+    }
+
+    Ok(())
+}
+
+unsafe fn check_physical_device_extensions(
+    instance: &Instance,
+    physical_device: vk::PhysicalDevice,
+) -> Result<()> {
+    let extensions = instance
+        .enumerate_device_extension_properties(physical_device, None)?
+        .iter()
+        .map(|e| e.extension_name)
+        .collect::<HashSet<_>>();
+    if DEVICE_EXTENSIONS.iter().all(|e| extensions.contains(e)) {
+        Ok(())
+    } else {
+        Err(anyhow!(errors::SuitabilityError("Missing required device extensions.")))
+    }
+}
+
+
+unsafe fn create_logical_device(
+    entry: &Entry,
+    instance: &Instance,
+    data: &mut app_data::AppData,
+) -> Result<Device> {
+    let indices = queue_family_indices::QueueFamilyIndices::get(instance, data, data.physical_device)?;
+
+    let queue_priorities = &[1.0];
+    let queue_info = vk::DeviceQueueCreateInfo::builder()
+        .queue_family_index(indices.graphics)
+        .queue_priorities(queue_priorities);
+
+    let layers = if VALIDATION_ENABLED {
+        vec![VALIDATION_LAYER.as_ptr()]
+    } else {
+        vec![]
+    };
+
+    let mut extensions = DEVICE_EXTENSIONS
+        .iter()
+        .map(|n| n.as_ptr())
+        .collect::<Vec<_>>();
+
+    // Required by Vulkan SDK on macOS since 1.3.216.
+    if cfg!(target_os = "macos") && entry.version()? >= PORTABILITY_MACOS_VERSION {
+        extensions.push(vk::KHR_PORTABILITY_SUBSET_EXTENSION.name.as_ptr());
+    };
+
+    let features = vk::PhysicalDeviceFeatures::builder();
+
+    let indices = queue_family_indices::QueueFamilyIndices::get(instance, data, data.physical_device)?;
+
+    let mut unique_indices = HashSet::new();
+    unique_indices.insert(indices.graphics);
+    unique_indices.insert(indices.present);
+
+    let queue_priorities = &[1.0];
+    let queue_infos = unique_indices
+        .iter()
+        .map(|i| {
+            vk::DeviceQueueCreateInfo::builder()
+                .queue_family_index(*i)
+                .queue_priorities(queue_priorities)
+        })
+        .collect::<Vec<_>>();
+
+
+    let info = vk::DeviceCreateInfo::builder()
+        .queue_create_infos(&queue_infos)
+        .enabled_layer_names(&layers)
+        .enabled_extension_names(&extensions)
+        .enabled_features(&features);
+    let device = instance.create_device(data.physical_device, &info, None)?;
+
+    data.graphics_queue = device.get_device_queue(indices.graphics, 0);
+    data.present_queue = device.get_device_queue(indices.present, 0);
+
+    Ok(device)
+}
+
+unsafe fn create_pipeline(device: &Device, data: &mut app_data::AppData) -> Result<()> {
+    let vert = include_bytes!("../shaders/vert.spv");
+    let frag = include_bytes!("../shaders/frag.spv");
+
+    let vert_shader_module = create_shader_module(device, &vert[..])?;
+    let frag_shader_module = create_shader_module(device, &frag[..])?;
+
+    let vert_stage = vk::PipelineShaderStageCreateInfo::builder()
+        .stage(vk::ShaderStageFlags::VERTEX)
+        .module(vert_shader_module)
+        .name(b"main\0");
+
+    let frag_stage = vk::PipelineShaderStageCreateInfo::builder()
+        .stage(vk::ShaderStageFlags::FRAGMENT)
+        .module(frag_shader_module)
+        .name(b"main\0");
+
+    let vertex_input_state = vk::PipelineVertexInputStateCreateInfo::builder();
+
+    let input_assembly_state = vk::PipelineInputAssemblyStateCreateInfo::builder()
+        .topology(vk::PrimitiveTopology::TRIANGLE_LIST)
+        .primitive_restart_enable(false);
+
+    let viewport = vk::Viewport::builder()
+        .x(0.0)
+        .y(0.0)
+        .width(data.swapchain_extent.width as f32)
+        .height(data.swapchain_extent.height as f32)
+        .min_depth(0.0)
+        .max_depth(1.0);
+
+    let scissor = vk::Rect2D::builder()
+        .offset(vk::Offset2D { x: 0, y: 0 })
+        .extent(data.swapchain_extent);
+
+    let viewports = &[viewport];
+    let scissors = &[scissor];
+    let viewport_state = vk::PipelineViewportStateCreateInfo::builder()
+        .viewports(viewports)
+        .scissors(scissors);
+
+    let rasterization_state = vk::PipelineRasterizationStateCreateInfo::builder()
+        .depth_clamp_enable(false)
+        .rasterizer_discard_enable(false)
+        .polygon_mode(vk::PolygonMode::FILL)
+        .line_width(1.0)
+        .cull_mode(vk::CullModeFlags::BACK)
+        .front_face(vk::FrontFace::CLOCKWISE)
+        .depth_bias_enable(false);
+
+    let multisample_state = vk::PipelineMultisampleStateCreateInfo::builder()
+        .sample_shading_enable(false)
+        .rasterization_samples(vk::SampleCountFlags::_1);
+
+    let attachment = vk::PipelineColorBlendAttachmentState::builder()
+        .color_write_mask(vk::ColorComponentFlags::all())
+        .blend_enable(false)
+        .src_color_blend_factor(vk::BlendFactor::ONE)  // Optional
+        .dst_color_blend_factor(vk::BlendFactor::ZERO) // Optional
+        .color_blend_op(vk::BlendOp::ADD)              // Optional
+        .src_alpha_blend_factor(vk::BlendFactor::ONE)  // Optional
+        .dst_alpha_blend_factor(vk::BlendFactor::ZERO) // Optional
+        .alpha_blend_op(vk::BlendOp::ADD);             // Optional
+    
+    let attachments = &[attachment];
+    let color_blend_state = vk::PipelineColorBlendStateCreateInfo::builder()
+        .logic_op_enable(false)
+        .logic_op(vk::LogicOp::COPY)
+        .attachments(attachments)
+        .blend_constants([0.0, 0.0, 0.0, 0.0]);
+
+    let layout_info = vk::PipelineLayoutCreateInfo::builder();
+
+    data.pipeline_layout = device.create_pipeline_layout(&layout_info, None)?;
+
+    let stages = &[vert_stage, frag_stage];
+    let info = vk::GraphicsPipelineCreateInfo::builder()
+        .stages(stages)
+        .vertex_input_state(&vertex_input_state)
+        .input_assembly_state(&input_assembly_state)
+        .viewport_state(&viewport_state)
+        .rasterization_state(&rasterization_state)
+        .multisample_state(&multisample_state)
+        .color_blend_state(&color_blend_state)
+        .layout(data.pipeline_layout)
+        .render_pass(data.render_pass)
+        .subpass(0);
+
+    data.pipeline = device.create_graphics_pipelines(
+        vk::PipelineCache::null(), &[info], None)?.0[0];
+
+    device.destroy_shader_module(vert_shader_module, None);
+    device.destroy_shader_module(frag_shader_module, None);
+
+    Ok(())
+}
+
+unsafe fn create_shader_module(
+    device: &Device,
+    bytecode: &[u8],
+) -> Result<vk::ShaderModule> {
+    let bytecode = Bytecode::new(bytecode).unwrap();
+    let info = vk::ShaderModuleCreateInfo::builder()
+        .code_size(bytecode.code_size())
+        .code(bytecode.code());
+
+    Ok(device.create_shader_module(&info, None)?)
+}
+
+unsafe fn create_render_pass(
+    instance: &Instance,
+    device: &Device,
+    data: &mut app_data::AppData,
+) -> Result<()> {
+    let color_attachment = vk::AttachmentDescription::builder()
+        .format(data.swapchain_format)
+        .samples(vk::SampleCountFlags::_1)
+        .load_op(vk::AttachmentLoadOp::CLEAR)
+        .store_op(vk::AttachmentStoreOp::STORE)
+        .stencil_load_op(vk::AttachmentLoadOp::DONT_CARE)
+        .stencil_store_op(vk::AttachmentStoreOp::DONT_CARE)
+        .initial_layout(vk::ImageLayout::UNDEFINED)
+        .final_layout(vk::ImageLayout::PRESENT_SRC_KHR);
+
+    let color_attachment_ref = vk::AttachmentReference::builder()
+        .attachment(0)
+        .layout(vk::ImageLayout::COLOR_ATTACHMENT_OPTIMAL);
+
+    let color_attachments = &[color_attachment_ref];
+    let subpass = vk::SubpassDescription::builder()
+        .pipeline_bind_point(vk::PipelineBindPoint::GRAPHICS)
+        .color_attachments(color_attachments);
+    
+    let dependency = vk::SubpassDependency::builder()
+        .src_subpass(vk::SUBPASS_EXTERNAL)
+        .dst_subpass(0)
+        .src_stage_mask(vk::PipelineStageFlags::COLOR_ATTACHMENT_OUTPUT)
+        .src_access_mask(vk::AccessFlags::empty())
+        .dst_stage_mask(vk::PipelineStageFlags::COLOR_ATTACHMENT_OUTPUT)
+        .dst_access_mask(vk::AccessFlags::COLOR_ATTACHMENT_WRITE);
+
+    let attachments = &[color_attachment];
+    let subpasses = &[subpass];
+    let dependencies = &[dependency];
+    let info = vk::RenderPassCreateInfo::builder()
+        .attachments(attachments)
+        .subpasses(subpasses)
+        .dependencies(dependencies);
+    
+    data.render_pass = device.create_render_pass(&info, None)?;
+
+    Ok(())
+}
+
+unsafe fn create_framebuffers(device: &Device, data: &mut app_data::AppData) -> Result<()> {
+    data.framebuffers = data
+        .swapchain_image_views
+        .iter()
+        .map(|i| {
+            let attachments = &[*i];
+            let create_info = vk::FramebufferCreateInfo::builder()
+                .render_pass(data.render_pass)
+                .attachments(attachments)
+                .width(data.swapchain_extent.width)
+                .height(data.swapchain_extent.height)
+                .layers(1);
+
+            device.create_framebuffer(&create_info, None)
+        })
+        .collect::<Result<Vec<_>, _>>()?;
+
+    Ok(())
+}
+
+unsafe fn create_command_pool(
+    instance: &Instance,
+    device: &Device,
+    data: &mut app_data::AppData,
+) -> Result<()> {
+    let indices = queue_family_indices::QueueFamilyIndices::get(instance, data, data.physical_device)?;
+
+    let info = vk::CommandPoolCreateInfo::builder()
+        .flags(vk::CommandPoolCreateFlags::empty()) // Optional.
+        .queue_family_index(indices.graphics);
+
+    data.command_pool = device.create_command_pool(&info, None)?;
+
+    Ok(())
+}
+
+unsafe fn create_command_buffers(device: &Device, data: &mut app_data::AppData) -> Result<()> {
+    let allocate_info = vk::CommandBufferAllocateInfo::builder()
+        .command_pool(data.command_pool)
+        .level(vk::CommandBufferLevel::PRIMARY)
+        .command_buffer_count(data.framebuffers.len() as u32);
+    
+    data.command_buffers = device.allocate_command_buffers(&allocate_info)?;
+
+    for (i, command_buffer) in data.command_buffers.iter().enumerate() {
+        let inheritance = vk::CommandBufferInheritanceInfo::builder();
+    
+        let info = vk::CommandBufferBeginInfo::builder()
+            .flags(vk::CommandBufferUsageFlags::empty()) // Optional.
+            .inheritance_info(&inheritance);             // Optional.
+    
+        device.begin_command_buffer(*command_buffer, &info)?;
+
+        let render_area = vk::Rect2D::builder()
+            .offset(vk::Offset2D::default())
+            .extent(data.swapchain_extent);
+
+        let color_clear_value = vk::ClearValue {
+            color: vk::ClearColorValue {
+                float32: [0.0, 0.0, 0.0, 1.0],
+            },
+        };
+
+        let clear_values = &[color_clear_value];
+        let info = vk::RenderPassBeginInfo::builder()
+            .render_pass(data.render_pass)
+            .framebuffer(data.framebuffers[i])
+            .render_area(render_area)
+            .clear_values(clear_values);
+
+        device.cmd_begin_render_pass(
+            *command_buffer, &info, vk::SubpassContents::INLINE);
+        
+        device.cmd_bind_pipeline(
+            *command_buffer, vk::PipelineBindPoint::GRAPHICS, data.pipeline);
+        
+        device.cmd_draw(*command_buffer, 3, 1, 0, 0);
+
+        device.cmd_end_render_pass(*command_buffer);
+
+        device.end_command_buffer(*command_buffer)?;
+    }
+
+    Ok(())
+}
+
+unsafe fn create_sync_objects(device: &Device, data: &mut app_data::AppData) -> Result<()> {
+    let semaphore_info = vk::SemaphoreCreateInfo::builder();
+    let fence_info = vk::FenceCreateInfo::builder()
+        .flags(vk::FenceCreateFlags::SIGNALED);
+
+    for _ in 0..MAX_FRAMES_IN_FLIGHT {
+        data.image_available_semaphores
+            .push(device.create_semaphore(&semaphore_info, None)?);
+        data.render_finished_semaphores
+            .push(device.create_semaphore(&semaphore_info, None)?);
+
+        data.in_flight_fences.push(device.create_fence(&fence_info, None)?);
+    }
+
+    data.images_in_flight = data.swapchain_images
+        .iter()
+        .map(|_| vk::Fence::null())
+        .collect();
+
+    Ok(())
+}