ui/ozone/demo/vulkan_renderer.cc - chromium/src - Git at Google

 // Copyright 2018 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "ui/ozone/demo/vulkan_renderer.h"

 #include <vulkan/vulkan.h>

 #include "base/location.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "gpu/vulkan/init/vulkan_factory.h"
 #include "gpu/vulkan/vulkan_command_buffer.h"
 #include "gpu/vulkan/vulkan_command_pool.h"
 #include "gpu/vulkan/vulkan_device_queue.h"
 #include "gpu/vulkan/vulkan_function_pointers.h"
 #include "gpu/vulkan/vulkan_implementation.h"
 #include "gpu/vulkan/vulkan_surface.h"
 #include "gpu/vulkan/vulkan_swap_chain.h"

 namespace ui {

 VulkanRenderer::VulkanRenderer(std::unique_ptr<gpu::VulkanSurface> surface,
                                gpu::VulkanImplementation* vulkan_implementation,
                                gfx::AcceleratedWidget widget,
                                const gfx::Size& size)
     : RendererBase(widget, size),
       vulkan_implementation_(vulkan_implementation),
       surface_(std::move(surface)),
       size_(size),
       weak_ptr_factory_(this) {}

 VulkanRenderer::~VulkanRenderer() {
   DestroyFramebuffers();
   DestroyRenderPass();
   surface_->Destroy();
   surface_.reset();
   command_pool_->Destroy();
   command_pool_.reset();
   device_queue_->Destroy();
   device_queue_.reset();
 }

 bool VulkanRenderer::Initialize() {
   TRACE_EVENT1("ozone", "VulkanRenderer::Initialize", "widget", widget_);

   device_queue_ = gpu::CreateVulkanDeviceQueue(
       vulkan_implementation_,
       gpu::VulkanDeviceQueue::GRAPHICS_QUEUE_FLAG |
           gpu::VulkanDeviceQueue::PRESENTATION_SUPPORT_QUEUE_FLAG);
   if (!device_queue_) {
     LOG(FATAL) << "Failed to init device queue";
   }

   if (!surface_->Initialize(device_queue_.get(),
                             gpu::VulkanSurface::DEFAULT_SURFACE_FORMAT)) {
     LOG(FATAL) << "Failed to init surface";
   }

   VkAttachmentDescription render_pass_attachments[] = {{
       /* .flags = */ 0,
       /* .format = */ surface_->surface_format().format,
       /* .samples = */ VK_SAMPLE_COUNT_1_BIT,
       /* .loadOp = */ VK_ATTACHMENT_LOAD_OP_CLEAR,
       /* .storeOp = */ VK_ATTACHMENT_STORE_OP_STORE,
       /* .stencilLoadOp = */ VK_ATTACHMENT_LOAD_OP_DONT_CARE,
       /* .stencilStoreOp = */ VK_ATTACHMENT_STORE_OP_DONT_CARE,
       /* .initialLayout = */ VK_IMAGE_LAYOUT_UNDEFINED,
       /* .finalLayout = */ VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
   }};

   VkAttachmentReference color_attachment_references[] = {
       {/* .attachment = */ 0,
        /* .layout = */ VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL}};

   VkSubpassDescription render_pass_subpasses[] = {{
       /* .flags = */ 0,
       /* .pipelineBindPoint = */ VK_PIPELINE_BIND_POINT_GRAPHICS,
       /* .inputAttachmentCount = */ 0,
       /* .pInputAttachments = */ nullptr,
       /* .colorAttachmentCount = */ base::size(color_attachment_references),
       /* .pColorAttachments = */ color_attachment_references,
       /* .pResolveAttachments = */ nullptr,
       /* .pDepthStencilAttachment = */ nullptr,
       /* .preserveAttachmentCount = */ 0,
       /* .pPreserveAttachments = */ nullptr,
   }};

   VkRenderPassCreateInfo render_pass_create_info = {
       /* .sType = */ VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
       /* .pNext = */ nullptr,
       /* .flags = */ 0,
       /* .attachmentCount = */ base::size(render_pass_attachments),
       /* .pAttachments = */ render_pass_attachments,
       /* .subpassCount = */ base::size(render_pass_subpasses),
       /* .pSubpasses = */ render_pass_subpasses,
       /* .dependencyCount = */ 0,
       /* .pDependencies = */ nullptr,
   };

   CHECK_EQ(vkCreateRenderPass(device_queue_->GetVulkanDevice(),
                               &render_pass_create_info, nullptr, &render_pass_),
            VK_SUCCESS);

   command_pool_ = std::make_unique<gpu::VulkanCommandPool>(device_queue_.get());
   CHECK(command_pool_->Initialize());

   RecreateFramebuffers();

   // Schedule the initial render.
   PostRenderFrameTask();
   return true;
 }

 void VulkanRenderer::DestroyRenderPass() {
   if (render_pass_ == VK_NULL_HANDLE)
     return;

   vkDestroyRenderPass(device_queue_->GetVulkanDevice(), render_pass_, nullptr);
   render_pass_ = VK_NULL_HANDLE;
 }

 void VulkanRenderer::DestroyFramebuffers() {
   VkDevice vk_device = device_queue_->GetVulkanDevice();

   VkResult result = vkQueueWaitIdle(device_queue_->GetVulkanQueue());
   CHECK_EQ(result, VK_SUCCESS);

   for (std::unique_ptr<Framebuffer>& framebuffer : framebuffers_) {
     if (!framebuffer)
       continue;

     framebuffer->command_buffer()->Destroy();
     vkDestroyFramebuffer(vk_device, framebuffer->vk_framebuffer(), nullptr);
     vkDestroyImageView(vk_device, framebuffer->vk_image_view(), nullptr);
     framebuffer.reset();
   }
 }

 void VulkanRenderer::RecreateFramebuffers() {
   TRACE_EVENT0("ozone", "VulkanRenderer::RecreateFramebuffers");

   DestroyFramebuffers();

   surface_->SetSize(size_);

   gpu::VulkanSwapChain* vulkan_swap_chain = surface_->GetSwapChain();
   const uint32_t num_images = vulkan_swap_chain->num_images();
   framebuffers_.resize(num_images);

   for (uint32_t image = 0; image < num_images; ++image) {
     framebuffers_[image] =
         Framebuffer::Create(device_queue_.get(), command_pool_.get(),
                             render_pass_, surface_.get(), image);
     CHECK(framebuffers_[image]);
   }
 }

 void VulkanRenderer::RenderFrame() {
   TRACE_EVENT0("ozone", "VulkanRenderer::RenderFrame");

   VkClearValue clear_value = {
       /* .color = */ {/* .float32 = */ {.5f, 1.f - NextFraction(), .5f, 1.f}}};

   gpu::VulkanSwapChain* vulkan_swap_chain = surface_->GetSwapChain();
   const uint32_t image = vulkan_swap_chain->current_image();
   const Framebuffer& framebuffer = *framebuffers_[image];

   gpu::VulkanCommandBuffer& command_buffer = *framebuffer.command_buffer();

   {
     gpu::ScopedSingleUseCommandBufferRecorder recorder(command_buffer);

     VkRenderPassBeginInfo begin_info = {
         /* .sType = */ VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO,
         /* .pNext = */ nullptr,
         /* .renderPass = */ render_pass_,
         /* .framebuffer = */ framebuffer.vk_framebuffer(),
         /* .renderArea = */
         {
             /* .offset = */ {
                 /* .x = */ 0,
                 /* .y = */ 0,
             },
             /* .extent = */
             {
                 /* .width = */ vulkan_swap_chain->size().width(),
                 /* .height = */ vulkan_swap_chain->size().height(),
             },
         },
         /* .clearValueCount = */ 1,
         /* .pClearValues = */ &clear_value,
     };

     vkCmdBeginRenderPass(recorder.handle(), &begin_info,
                          VK_SUBPASS_CONTENTS_INLINE);

     vkCmdEndRenderPass(recorder.handle());
   }

   CHECK(command_buffer.Submit(0, nullptr, 0, nullptr));

   vulkan_swap_chain->SwapBuffers();

   PostRenderFrameTask();
 }

 void VulkanRenderer::PostRenderFrameTask() {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::BindOnce(&VulkanRenderer::RenderFrame,
                                 weak_ptr_factory_.GetWeakPtr()));
 }

 VulkanRenderer::Framebuffer::Framebuffer(
     VkImageView vk_image_view,
     VkFramebuffer vk_framebuffer,
     std::unique_ptr<gpu::VulkanCommandBuffer> command_buffer)
     : vk_image_view_(vk_image_view),
       vk_framebuffer_(vk_framebuffer),
       command_buffer_(std::move(command_buffer)) {}

 VulkanRenderer::Framebuffer::~Framebuffer() {}

 std::unique_ptr<VulkanRenderer::Framebuffer>
 VulkanRenderer::Framebuffer::Create(gpu::VulkanDeviceQueue* vulkan_device_queue,
                                     gpu::VulkanCommandPool* vulkan_command_pool,
                                     VkRenderPass vk_render_pass,
                                     gpu::VulkanSurface* vulkan_surface,
                                     uint32_t vulkan_swap_chain_image_index) {
   gpu::VulkanSwapChain* vulkan_swap_chain = vulkan_surface->GetSwapChain();
   const VkDevice vk_device = vulkan_device_queue->GetVulkanDevice();
   VkImageViewCreateInfo vk_image_view_create_info = {
       /* .sType = */ VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
       /* .pNext = */ nullptr,
       /* .flags = */ 0,
       /* .image = */ vulkan_swap_chain->GetImage(vulkan_swap_chain_image_index),
       /* .viewType = */ VK_IMAGE_VIEW_TYPE_2D,
       /* .format = */ vulkan_surface->surface_format().format,
       /* .components = */
       {
           /* .r = */ VK_COMPONENT_SWIZZLE_IDENTITY,
           /* .b = */ VK_COMPONENT_SWIZZLE_IDENTITY,
           /* .g = */ VK_COMPONENT_SWIZZLE_IDENTITY,
           /* .a = */ VK_COMPONENT_SWIZZLE_IDENTITY,
       },
       /* .subresourceRange = */
       {
           /* .aspectMask = */ VK_IMAGE_ASPECT_COLOR_BIT,
           /* .baseMipLevel = */ 0,
           /* .levelCount = */ 1,
           /* .baseArrayLayer = */ 0,
           /* .layerCount = */ 1,
       },
   };

   VkResult result;
   VkImageView vk_image_view = VK_NULL_HANDLE;
   result = vkCreateImageView(vk_device, &vk_image_view_create_info, nullptr,
                              &vk_image_view);
   if (result != VK_SUCCESS) {
     LOG(FATAL) << "Failed to create a Vulkan image view.";
   }
   VkFramebufferCreateInfo vk_framebuffer_create_info = {
       /* .sType = */ VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,
       /* .pNext = */ nullptr,
       /* .flags = */ 0,
       /* .renderPass = */ vk_render_pass,
       /* .attachmentCount = */ 1,
       /* .pAttachments = */ &vk_image_view,
       /* .width = */ vulkan_swap_chain->size().width(),
       /* .height = */ vulkan_swap_chain->size().height(),
       /* .layers = */ 1,
   };

   VkFramebuffer vk_framebuffer = VK_NULL_HANDLE;
   result = vkCreateFramebuffer(vk_device, &vk_framebuffer_create_info, nullptr,
                                &vk_framebuffer);
   if (result != VK_SUCCESS) {
     LOG(FATAL) << "Failed to create a Vulkan framebuffer.";
   }

   auto command_buffer = std::make_unique<gpu::VulkanCommandBuffer>(
       vulkan_device_queue, vulkan_command_pool, true /* primary */);
   CHECK(command_buffer->Initialize());

   return std::make_unique<VulkanRenderer::Framebuffer>(
       vk_image_view, vk_framebuffer, std::move(command_buffer));
 }

 }  // namespace ui
	// Copyright 2018 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "ui/ozone/demo/vulkan_renderer.h"

	#include <vulkan/vulkan.h>

	#include "base/location.h"
	#include "base/threading/thread_task_runner_handle.h"
	#include "base/trace_event/trace_event.h"
	#include "gpu/vulkan/init/vulkan_factory.h"
	#include "gpu/vulkan/vulkan_command_buffer.h"
	#include "gpu/vulkan/vulkan_command_pool.h"
	#include "gpu/vulkan/vulkan_device_queue.h"
	#include "gpu/vulkan/vulkan_function_pointers.h"
	#include "gpu/vulkan/vulkan_implementation.h"
	#include "gpu/vulkan/vulkan_surface.h"
	#include "gpu/vulkan/vulkan_swap_chain.h"

	namespace ui {

	VulkanRenderer::VulkanRenderer(std::unique_ptr<gpu::VulkanSurface> surface,
	gpu::VulkanImplementation* vulkan_implementation,
	gfx::AcceleratedWidget widget,
	const gfx::Size& size)
	: RendererBase(widget, size),
	vulkan_implementation_(vulkan_implementation),
	surface_(std::move(surface)),
	size_(size),
	weak_ptr_factory_(this) {}

	VulkanRenderer::~VulkanRenderer() {
	DestroyFramebuffers();
	DestroyRenderPass();
	surface_->Destroy();
	surface_.reset();
	command_pool_->Destroy();
	command_pool_.reset();
	device_queue_->Destroy();
	device_queue_.reset();
	}

	bool VulkanRenderer::Initialize() {
	TRACE_EVENT1("ozone", "VulkanRenderer::Initialize", "widget", widget_);

	device_queue_ = gpu::CreateVulkanDeviceQueue(
	vulkan_implementation_,
	gpu::VulkanDeviceQueue::GRAPHICS_QUEUE_FLAG \|
	gpu::VulkanDeviceQueue::PRESENTATION_SUPPORT_QUEUE_FLAG);
	if (!device_queue_) {
	LOG(FATAL) << "Failed to init device queue";
	}

	if (!surface_->Initialize(device_queue_.get(),
	gpu::VulkanSurface::DEFAULT_SURFACE_FORMAT)) {
	LOG(FATAL) << "Failed to init surface";
	}

	VkAttachmentDescription render_pass_attachments[] = {{
	/* .flags = */ 0,
	/* .format = */ surface_->surface_format().format,
	/* .samples = */ VK_SAMPLE_COUNT_1_BIT,
	/* .loadOp = */ VK_ATTACHMENT_LOAD_OP_CLEAR,
	/* .storeOp = */ VK_ATTACHMENT_STORE_OP_STORE,
	/* .stencilLoadOp = */ VK_ATTACHMENT_LOAD_OP_DONT_CARE,
	/* .stencilStoreOp = */ VK_ATTACHMENT_STORE_OP_DONT_CARE,
	/* .initialLayout = */ VK_IMAGE_LAYOUT_UNDEFINED,
	/* .finalLayout = */ VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,
	}};

	VkAttachmentReference color_attachment_references[] = {
	{/* .attachment = */ 0,
	/* .layout = */ VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL}};

	VkSubpassDescription render_pass_subpasses[] = {{
	/* .flags = */ 0,
	/* .pipelineBindPoint = */ VK_PIPELINE_BIND_POINT_GRAPHICS,
	/* .inputAttachmentCount = */ 0,
	/* .pInputAttachments = */ nullptr,
	/* .colorAttachmentCount = */ base::size(color_attachment_references),
	/* .pColorAttachments = */ color_attachment_references,
	/* .pResolveAttachments = */ nullptr,
	/* .pDepthStencilAttachment = */ nullptr,
	/* .preserveAttachmentCount = */ 0,
	/* .pPreserveAttachments = */ nullptr,
	}};

	VkRenderPassCreateInfo render_pass_create_info = {
	/* .sType = */ VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
	/* .pNext = */ nullptr,
	/* .flags = */ 0,
	/* .attachmentCount = */ base::size(render_pass_attachments),
	/* .pAttachments = */ render_pass_attachments,
	/* .subpassCount = */ base::size(render_pass_subpasses),
	/* .pSubpasses = */ render_pass_subpasses,
	/* .dependencyCount = */ 0,
	/* .pDependencies = */ nullptr,
	};

	CHECK_EQ(vkCreateRenderPass(device_queue_->GetVulkanDevice(),
	&render_pass_create_info, nullptr, &render_pass_),
	VK_SUCCESS);

	command_pool_ = std::make_unique<gpu::VulkanCommandPool>(device_queue_.get());
	CHECK(command_pool_->Initialize());

	RecreateFramebuffers();

	// Schedule the initial render.
	PostRenderFrameTask();
	return true;
	}

	void VulkanRenderer::DestroyRenderPass() {
	if (render_pass_ == VK_NULL_HANDLE)
	return;

	vkDestroyRenderPass(device_queue_->GetVulkanDevice(), render_pass_, nullptr);
	render_pass_ = VK_NULL_HANDLE;
	}

	void VulkanRenderer::DestroyFramebuffers() {
	VkDevice vk_device = device_queue_->GetVulkanDevice();

	VkResult result = vkQueueWaitIdle(device_queue_->GetVulkanQueue());
	CHECK_EQ(result, VK_SUCCESS);

	for (std::unique_ptr<Framebuffer>& framebuffer : framebuffers_) {
	if (!framebuffer)
	continue;

	framebuffer->command_buffer()->Destroy();
	vkDestroyFramebuffer(vk_device, framebuffer->vk_framebuffer(), nullptr);
	vkDestroyImageView(vk_device, framebuffer->vk_image_view(), nullptr);
	framebuffer.reset();
	}
	}

	void VulkanRenderer::RecreateFramebuffers() {
	TRACE_EVENT0("ozone", "VulkanRenderer::RecreateFramebuffers");

	DestroyFramebuffers();

	surface_->SetSize(size_);

	gpu::VulkanSwapChain* vulkan_swap_chain = surface_->GetSwapChain();
	const uint32_t num_images = vulkan_swap_chain->num_images();
	framebuffers_.resize(num_images);

	for (uint32_t image = 0; image < num_images; ++image) {
	framebuffers_[image] =
	Framebuffer::Create(device_queue_.get(), command_pool_.get(),
	render_pass_, surface_.get(), image);
	CHECK(framebuffers_[image]);
	}
	}

	void VulkanRenderer::RenderFrame() {
	TRACE_EVENT0("ozone", "VulkanRenderer::RenderFrame");

	VkClearValue clear_value = {
	/* .color = / {/ .float32 = */ {.5f, 1.f - NextFraction(), .5f, 1.f}}};

	gpu::VulkanSwapChain* vulkan_swap_chain = surface_->GetSwapChain();
	const uint32_t image = vulkan_swap_chain->current_image();
	const Framebuffer& framebuffer = *framebuffers_[image];

	gpu::VulkanCommandBuffer& command_buffer = *framebuffer.command_buffer();

	{
	gpu::ScopedSingleUseCommandBufferRecorder recorder(command_buffer);

	VkRenderPassBeginInfo begin_info = {
	/* .sType = */ VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO,
	/* .pNext = */ nullptr,
	/* .renderPass = */ render_pass_,
	/* .framebuffer = */ framebuffer.vk_framebuffer(),
	/* .renderArea = */
	{
	/* .offset = */ {
	/* .x = */ 0,
	/* .y = */ 0,
	},
	/* .extent = */
	{
	/* .width = */ vulkan_swap_chain->size().width(),
	/* .height = */ vulkan_swap_chain->size().height(),
	},
	},
	/* .clearValueCount = */ 1,
	/* .pClearValues = */ &clear_value,
	};

	vkCmdBeginRenderPass(recorder.handle(), &begin_info,
	VK_SUBPASS_CONTENTS_INLINE);

	vkCmdEndRenderPass(recorder.handle());
	}

	CHECK(command_buffer.Submit(0, nullptr, 0, nullptr));

	vulkan_swap_chain->SwapBuffers();

	PostRenderFrameTask();
	}

	void VulkanRenderer::PostRenderFrameTask() {
	base::ThreadTaskRunnerHandle::Get()->PostTask(
	FROM_HERE, base::BindOnce(&VulkanRenderer::RenderFrame,
	weak_ptr_factory_.GetWeakPtr()));
	}

	VulkanRenderer::Framebuffer::Framebuffer(
	VkImageView vk_image_view,
	VkFramebuffer vk_framebuffer,
	std::unique_ptr<gpu::VulkanCommandBuffer> command_buffer)
	: vk_image_view_(vk_image_view),
	vk_framebuffer_(vk_framebuffer),
	command_buffer_(std::move(command_buffer)) {}

	VulkanRenderer::Framebuffer::~Framebuffer() {}

	std::unique_ptr<VulkanRenderer::Framebuffer>
	VulkanRenderer::Framebuffer::Create(gpu::VulkanDeviceQueue* vulkan_device_queue,
	gpu::VulkanCommandPool* vulkan_command_pool,
	VkRenderPass vk_render_pass,
	gpu::VulkanSurface* vulkan_surface,
	uint32_t vulkan_swap_chain_image_index) {
	gpu::VulkanSwapChain* vulkan_swap_chain = vulkan_surface->GetSwapChain();
	const VkDevice vk_device = vulkan_device_queue->GetVulkanDevice();
	VkImageViewCreateInfo vk_image_view_create_info = {
	/* .sType = */ VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
	/* .pNext = */ nullptr,
	/* .flags = */ 0,
	/* .image = */ vulkan_swap_chain->GetImage(vulkan_swap_chain_image_index),
	/* .viewType = */ VK_IMAGE_VIEW_TYPE_2D,
	/* .format = */ vulkan_surface->surface_format().format,
	/* .components = */
	{
	/* .r = */ VK_COMPONENT_SWIZZLE_IDENTITY,
	/* .b = */ VK_COMPONENT_SWIZZLE_IDENTITY,
	/* .g = */ VK_COMPONENT_SWIZZLE_IDENTITY,
	/* .a = */ VK_COMPONENT_SWIZZLE_IDENTITY,
	},
	/* .subresourceRange = */
	{
	/* .aspectMask = */ VK_IMAGE_ASPECT_COLOR_BIT,
	/* .baseMipLevel = */ 0,
	/* .levelCount = */ 1,
	/* .baseArrayLayer = */ 0,
	/* .layerCount = */ 1,
	},
	};

	VkResult result;
	VkImageView vk_image_view = VK_NULL_HANDLE;
	result = vkCreateImageView(vk_device, &vk_image_view_create_info, nullptr,
	&vk_image_view);
	if (result != VK_SUCCESS) {
	LOG(FATAL) << "Failed to create a Vulkan image view.";
	}
	VkFramebufferCreateInfo vk_framebuffer_create_info = {
	/* .sType = */ VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,
	/* .pNext = */ nullptr,
	/* .flags = */ 0,
	/* .renderPass = */ vk_render_pass,
	/* .attachmentCount = */ 1,
	/* .pAttachments = */ &vk_image_view,
	/* .width = */ vulkan_swap_chain->size().width(),
	/* .height = */ vulkan_swap_chain->size().height(),
	/* .layers = */ 1,
	};

	VkFramebuffer vk_framebuffer = VK_NULL_HANDLE;
	result = vkCreateFramebuffer(vk_device, &vk_framebuffer_create_info, nullptr,
	&vk_framebuffer);
	if (result != VK_SUCCESS) {
	LOG(FATAL) << "Failed to create a Vulkan framebuffer.";
	}

	auto command_buffer = std::make_unique<gpu::VulkanCommandBuffer>(
	vulkan_device_queue, vulkan_command_pool, true /* primary */);
	CHECK(command_buffer->Initialize());

	return std::make_unique<VulkanRenderer::Framebuffer>(
	vk_image_view, vk_framebuffer, std::move(command_buffer));
	}

	} // namespace ui