Set up Framebuffers, Command Pool, and Command Buffers

src/app.rs

@@ -1,6 +1,7 @@
 mod functions;
 use functions::{
-    create_instance, create_logical_device, create_pipeline, create_render_pass, create_swapchain,
+    create_command_buffers, create_command_pool, create_framebuffers, create_instance,
+    create_logical_device, create_pipeline, create_render_pass, create_swapchain,
     create_swapchain_image_views, pick_physical_device,
 };
 
@@ -29,6 +30,9 @@ pub struct App {
 
 impl App {
     /// Creates our Vulkan app.
+    ///
+    /// # Safety
+    /// Here be Dragons
     pub unsafe fn create(window: &Window) -> Result<Self> {
         let loader = LibloadingLoader::new(LIBRARY)?;
         let entry = Entry::new(loader).map_err(|b| anyhow!("{}", b))?;
@@ -44,6 +48,9 @@ impl App {
         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)?;
 
         Ok(Self {
             entry,
@@ -54,12 +61,24 @@ impl App {
     }
 
     /// Renders a frame for our Vulkan app.
+    ///
+    /// # Safety
+    /// Here be Dragons
     pub unsafe fn render(&mut self, _window: &Window) -> Result<()> {
         Ok(())
     }
 
-    /// Destroys our Vulkan app.
+    /// Destroys our Vulkan app, in reverse order of creation
+    ///
+    /// # Safety
+    /// Here be Dragons
     pub unsafe fn destroy(&mut self) {
+        self.device
+            .destroy_command_pool(self.data.command_pool, None);
+        self.data
+            .framebuffers
+            .iter()
+            .for_each(|f| self.device.destroy_framebuffer(*f, None));
         self.device.destroy_pipeline(self.data.pipeline, None);
         self.device
             .destroy_pipeline_layout(self.data.pipeline_layout, None);
@@ -98,9 +117,16 @@ pub struct AppData {
     swapchain: vk::SwapchainKHR,
     swapchain_images: Vec<vk::Image>,
     swapchain_image_views: Vec<vk::ImageView>,
+    // Pipeline
     render_pass: vk::RenderPass,
     pipeline_layout: vk::PipelineLayout,
     pipeline: vk::Pipeline,
+    // Framebuffers
+    framebuffers: Vec<vk::Framebuffer>,
+    // Command Pool
+    command_pool: vk::CommandPool,
+    // Command Buffers
+    command_buffers: Vec<vk::CommandBuffer>,
 }
 
 impl AppData {}

src/app/functions.rs

@@ -520,3 +520,98 @@ unsafe fn create_shader_module(device: &Device, bytecode: &[u8]) -> Result<vk::S
 
     Ok(device.create_shader_module(&info, None)?)
 }
+
+pub(super) unsafe fn create_framebuffers(device: &Device, data: &mut 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(())
+}
+
+//================================================
+// Command Pool
+//================================================
+
+pub(super) unsafe fn create_command_pool(
+    instance: &Instance,
+    device: &Device,
+    data: &mut AppData,
+) -> Result<()> {
+    let indices = QueueFamilyIndices::get(instance, data, data.physical_device)?;
+
+    let info = vk::CommandPoolCreateInfo::builder()
+        .flags(vk::CommandPoolCreateFlags::empty())
+        .queue_family_index(indices.graphics);
+
+    data.command_pool = device.create_command_pool(&info, None)?;
+
+    Ok(())
+}
+
+//================================================
+// Command Buffers
+//================================================
+
+pub(super) unsafe fn create_command_buffers(device: &Device, data: &mut AppData) -> Result<()> {
+    // Create the buffers
+    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)?;
+
+    // Add commands
+    for (i, command_buffer) in data.command_buffers.iter().enumerate() {
+        let inheritance = vk::CommandBufferInheritanceInfo::builder();
+
+        let info = vk::CommandBufferBeginInfo::builder()
+            .flags(vk::CommandBufferUsageFlags::empty())
+            .inheritance_info(&inheritance);
+
+        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(())
+}

src/lib.rs

@@ -2,10 +2,41 @@ mod app;
 pub use app::App;
 
 use ::anyhow::Result;
-use ::winit::window::Window;
+use ::winit::dpi::LogicalSize;
+use ::winit::event::{Event, WindowEvent};
+use ::winit::event_loop::{ControlFlow, EventLoop};
+use ::winit::window::WindowBuilder;
 
 pub const VALIDATION_ENABLED: bool = cfg!(debug_assertions);
 
-pub fn create_app(window: &Window) -> Result<App> {
-    Ok(unsafe { App::create(&window)? })
+pub fn run() -> Result<()> {
+    // 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)? };
+    let mut destroying = false;
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Poll;
+        match event {
+            // Render a frame if our Vulkan app is not being destroyed
+            Event::MainEventsCleared if !destroying => unsafe { app.render(&window) }.unwrap(),
+            // Destroy our Vulkan app.
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                destroying = true;
+                *control_flow = ControlFlow::Exit;
+                unsafe {
+                    app.destroy();
+                }
+            }
+            _ => {}
+        }
+    });
 }

src/main.rs

@@ -1,41 +1,4 @@
-use ::anyhow::Result;
-use ::winit::dpi::LogicalSize;
-use ::winit::event::{Event, WindowEvent};
-use ::winit::event_loop::{ControlFlow, EventLoop};
-use ::winit::window::WindowBuilder;
-
-use vulkan_tutorial::create_app;
-
-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 = create_app(&window)?;
-    let mut destroying = false;
-    event_loop.run(move |event, _, control_flow| {
-        *control_flow = ControlFlow::Poll;
-        match event {
-            // Render a frame if our Vulkan app is not being destroyed
-            Event::MainEventsCleared if !destroying => unsafe { app.render(&window) }.unwrap(),
-            // Destroy our Vulkan app.
-            Event::WindowEvent {
-                event: WindowEvent::CloseRequested,
-                ..
-            } => {
-                destroying = true;
-                *control_flow = ControlFlow::Exit;
-                unsafe {
-                    app.destroy();
-                }
-            }
-            _ => {}
-        }
-    });
+fn main() -> ::anyhow::Result<()> {
+    ::pretty_env_logger::init();
+    ::vulkan_tutorial::run()
 }