Use more framework functionality in mobile_nerf (#946)

* Add additional one-off command-buffer support

* Use framework code for mobile_nerf

framework/api_vulkan_sample.cpp

@@ -1,4 +1,4 @@
-/* Copyright (c) 2019-2023, Sascha Willems
+/* Copyright (c) 2019-2024, Sascha Willems
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -1316,3 +1316,14 @@ void ApiVulkanSample::with_command_buffer(const std::function<void(VkCommandBuff
 	f(command_buffer);
 	device->flush_command_buffer(command_buffer, queue, true, signalSemaphore);
 }
+
+void ApiVulkanSample::with_vkb_command_buffer(const std::function<void(vkb::CommandBuffer &command_buffer)> &f)
+{
+	auto &cmd = device->request_command_buffer();
+	cmd.begin(VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT, VK_NULL_HANDLE);
+	f(cmd);
+	cmd.end();
+	auto &queue = device->get_queue_by_flags(VK_QUEUE_GRAPHICS_BIT, 0);
+	queue.submit(cmd, device->request_fence());
+	device->get_fence_pool().wait();
+}

framework/api_vulkan_sample.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2019-2023, Sascha Willems
+/* Copyright (c) 2019-2024, Sascha Willems
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -254,6 +254,12 @@ class ApiVulkanSample : public vkb::VulkanSample
 	 */
 	void with_command_buffer(const std::function<void(VkCommandBuffer command_buffer)> &f, VkSemaphore signalSemaphore = VK_NULL_HANDLE);
 
+	/**
+	 * @brief Synchronously execute a block code within a command buffer vkb wrapper, then submit the command buffer and wait for completion.
+	 * @param f a block of code which is passed a command buffer which is already in the begin state.
+	 */
+	void with_vkb_command_buffer(const std::function<void(vkb::CommandBuffer &command_buffer)> &f);
+
   public:
 	/**
 	 * @brief Called when a view change occurs, can be overriden in derived samples to handle updating uniforms