feat(renderer): create command pool and buffer

crates/renderer/src/lib.rs

@@ -41,6 +41,10 @@ pub struct Renderer {
     swapchain_extent: vk::Extent2D,
     /// The views into the swapchain images.
     swapchain_image_views: Vec<vk::ImageView>,
+    /// The pool used to allocate command buffers.
+    command_pool: vk::CommandPool,
+    /// The buffer used to record GPU commands.
+    command_buffer: vk::CommandBuffer,
 }
 
 impl Renderer {
@@ -128,6 +132,22 @@ impl Renderer {
         // Create image views for the swapchain images
         let image_views = Self::create_image_views(&device, &swapchain_images, swapchain_format)?;
 
+        // Create the command pool
+        let pool_create_info = vk::CommandPoolCreateInfo::default()
+            .queue_family_index(graphics_queue_index)
+            // Allows us to reuse the command buffer every frame by resetting it
+            .flags(vk::CommandPoolCreateFlags::RESET_COMMAND_BUFFER);
+
+        let command_pool = unsafe { device.create_command_pool(&pool_create_info, None)? };
+
+        // Allocate the main command buffer used for rendering
+        let alloc_info = vk::CommandBufferAllocateInfo::default()
+            .command_pool(command_pool)
+            .level(vk::CommandBufferLevel::PRIMARY)
+            .command_buffer_count(1);
+
+        let command_buffer = unsafe { device.allocate_command_buffers(&alloc_info)?[0] };
+
         Ok(Self {
             _entry: entry,
             instance,
@@ -145,6 +165,8 @@ impl Renderer {
             swapchain_format,
             swapchain_extent,
             swapchain_image_views: image_views,
+            command_pool,
+            command_buffer,
         })
     }
 
@@ -355,6 +377,8 @@ impl Renderer {
 impl Drop for Renderer {
     fn drop(&mut self) {
         unsafe {
+            self.device.destroy_command_pool(self.command_pool, None);
+
             // Destroy the swapchain
             self.swapchain_loader.destroy_swapchain(self.swapchain, None);