imgui/examples/vulkan_example/main.cpp

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// ImGui - standalone example application for Glfw + Vulkan
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// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
#include "imgui.h"
#include "../imgui_impl_glfw.h"
#include "../imgui_impl_vulkan.h"
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#include <stdio.h> // printf, fprintf
#include <stdlib.h> // abort
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#define GLFW_INCLUDE_NONE
#define GLFW_INCLUDE_VULKAN
#include <GLFW/glfw3.h>
#include <vulkan/vulkan.h>
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// FIXME-VULKAN: Resizing with IMGUI_UNLIMITED_FRAME_RATE triggers errors from the validation layer.
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#define IMGUI_MAX_POSSIBLE_BACK_BUFFERS 16
#define IMGUI_UNLIMITED_FRAME_RATE
#ifdef _DEBUG
#define IMGUI_VULKAN_DEBUG_REPORT
#endif
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static VkAllocationCallbacks* g_Allocator = NULL;
static VkInstance g_Instance = VK_NULL_HANDLE;
static VkPhysicalDevice g_PhysicalDevice = VK_NULL_HANDLE;
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static VkDevice g_Device = VK_NULL_HANDLE;
static uint32_t g_QueueFamily = (uint32_t)-1;
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static VkQueue g_Queue = VK_NULL_HANDLE;
static VkDebugReportCallbackEXT g_DebugReport = VK_NULL_HANDLE;
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static VkPipelineCache g_PipelineCache = VK_NULL_HANDLE;
static VkDescriptorPool g_DescriptorPool = VK_NULL_HANDLE;
struct FrameData
{
uint32_t BackbufferIndex; // keep track of recently rendered swapchain frame indices
VkCommandPool CommandPool;
VkCommandBuffer CommandBuffer;
VkFence Fence;
VkSemaphore PresentCompleteSemaphore;
VkSemaphore RenderCompleteSemaphore;
FrameData()
{
BackbufferIndex = 0;
CommandPool = VK_NULL_HANDLE;
CommandBuffer = VK_NULL_HANDLE;
Fence = VK_NULL_HANDLE;
PresentCompleteSemaphore = VK_NULL_HANDLE;
RenderCompleteSemaphore = VK_NULL_HANDLE;
}
};
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struct WindowData
{
int Width, Height;
VkSwapchainKHR Swapchain;
VkSurfaceKHR Surface;
VkSurfaceFormatKHR SurfaceFormat;
VkPresentModeKHR PresentMode;
VkRenderPass RenderPass;
VkClearValue ClearValue;
uint32_t BackBufferCount;
VkImage BackBuffer[IMGUI_MAX_POSSIBLE_BACK_BUFFERS];
VkImageView BackBufferView[IMGUI_MAX_POSSIBLE_BACK_BUFFERS];
VkFramebuffer Framebuffer[IMGUI_MAX_POSSIBLE_BACK_BUFFERS];
uint32_t FrameIndex;
FrameData Frames[IMGUI_VK_QUEUED_FRAMES];
WindowData()
{
Width = Height = 0;
Swapchain = VK_NULL_HANDLE;
Surface = VK_NULL_HANDLE;
memset(&SurfaceFormat, 0, sizeof(SurfaceFormat));
PresentMode = VK_PRESENT_MODE_MAX_ENUM_KHR;
RenderPass = VK_NULL_HANDLE;
memset(&ClearValue, 0, sizeof(ClearValue));
BackBufferCount = 0;
memset(&BackBuffer, 0, sizeof(BackBuffer));
memset(&BackBufferView, 0, sizeof(BackBufferView));
memset(&Framebuffer, 0, sizeof(Framebuffer));
FrameIndex = 0;
}
};
static WindowData g_WindowData;
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static void check_vk_result(VkResult err)
{
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if (err == 0) return;
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printf("VkResult %d\n", err);
if (err < 0)
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abort();
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}
static void CreateOrResizeSwapChainAndFrameBuffer(WindowData* wd, int w, int h)
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{
VkResult err;
VkSwapchainKHR old_swapchain = wd->Swapchain;
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err = vkDeviceWaitIdle(g_Device);
check_vk_result(err);
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// Destroy old Framebuffer
for (uint32_t i = 0; i < wd->BackBufferCount; i++)
{
if (wd->BackBufferView[i])
vkDestroyImageView(g_Device, wd->BackBufferView[i], g_Allocator);
if (wd->Framebuffer[i])
vkDestroyFramebuffer(g_Device, wd->Framebuffer[i], g_Allocator);
}
wd->BackBufferCount = 0;
if (wd->RenderPass)
vkDestroyRenderPass(g_Device, wd->RenderPass, g_Allocator);
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// Create Swapchain
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{
VkSwapchainCreateInfoKHR info = {};
info.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
info.surface = wd->Surface;
info.imageFormat = wd->SurfaceFormat.format;
info.imageColorSpace = wd->SurfaceFormat.colorSpace;
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info.imageArrayLayers = 1;
info.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE; // Assume that graphics family == present family
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info.preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
info.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
info.presentMode = wd->PresentMode;
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info.clipped = VK_TRUE;
info.oldSwapchain = old_swapchain;
VkSurfaceCapabilitiesKHR cap;
err = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(g_PhysicalDevice, wd->Surface, &cap);
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check_vk_result(err);
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if (cap.maxImageCount > 0)
info.minImageCount = (cap.minImageCount + 2 < cap.maxImageCount) ? (cap.minImageCount + 2) : cap.maxImageCount;
else
info.minImageCount = cap.minImageCount + 2;
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if (cap.currentExtent.width == 0xffffffff)
{
info.imageExtent.width = wd->Width = w;
info.imageExtent.height = wd->Height = h;
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}
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else
{
info.imageExtent.width = wd->Width = cap.currentExtent.width;
info.imageExtent.height = wd->Height = cap.currentExtent.height;
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}
err = vkCreateSwapchainKHR(g_Device, &info, g_Allocator, &wd->Swapchain);
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check_vk_result(err);
err = vkGetSwapchainImagesKHR(g_Device, wd->Swapchain, &wd->BackBufferCount, NULL);
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check_vk_result(err);
err = vkGetSwapchainImagesKHR(g_Device, wd->Swapchain, &wd->BackBufferCount, wd->BackBuffer);
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check_vk_result(err);
}
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if (old_swapchain)
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vkDestroySwapchainKHR(g_Device, old_swapchain, g_Allocator);
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// Create the Render Pass
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{
VkAttachmentDescription attachment = {};
attachment.format = wd->SurfaceFormat.format;
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attachment.samples = VK_SAMPLE_COUNT_1_BIT;
attachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
attachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
attachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
attachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
attachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
attachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
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VkAttachmentReference color_attachment = {};
color_attachment.attachment = 0;
color_attachment.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
VkSubpassDescription subpass = {};
subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
subpass.colorAttachmentCount = 1;
subpass.pColorAttachments = &color_attachment;
VkRenderPassCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
info.attachmentCount = 1;
info.pAttachments = &attachment;
info.subpassCount = 1;
info.pSubpasses = &subpass;
err = vkCreateRenderPass(g_Device, &info, g_Allocator, &wd->RenderPass);
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check_vk_result(err);
}
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// Create The Image Views
{
VkImageViewCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
info.viewType = VK_IMAGE_VIEW_TYPE_2D;
info.format = wd->SurfaceFormat.format;
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info.components.r = VK_COMPONENT_SWIZZLE_R;
info.components.g = VK_COMPONENT_SWIZZLE_G;
info.components.b = VK_COMPONENT_SWIZZLE_B;
info.components.a = VK_COMPONENT_SWIZZLE_A;
VkImageSubresourceRange image_range = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 };
info.subresourceRange = image_range;
for (uint32_t i = 0; i < wd->BackBufferCount; i++)
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{
info.image = wd->BackBuffer[i];
err = vkCreateImageView(g_Device, &info, g_Allocator, &wd->BackBufferView[i]);
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check_vk_result(err);
}
}
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// Create Framebuffer
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{
VkImageView attachment[1];
VkFramebufferCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
info.renderPass = wd->RenderPass;
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info.attachmentCount = 1;
info.pAttachments = attachment;
info.width = wd->Width;
info.height = wd->Height;
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info.layers = 1;
for (uint32_t i = 0; i < wd->BackBufferCount; i++)
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{
attachment[0] = wd->BackBufferView[i];
err = vkCreateFramebuffer(g_Device, &info, g_Allocator, &wd->Framebuffer[i]);
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check_vk_result(err);
}
}
}
#ifdef IMGUI_VULKAN_DEBUG_REPORT
static VKAPI_ATTR VkBool32 VKAPI_CALL debug_report(VkDebugReportFlagsEXT flags, VkDebugReportObjectTypeEXT objectType, uint64_t object, size_t location, int32_t messageCode, const char* pLayerPrefix, const char* pMessage, void* pUserData)
{
(void)flags; (void)object; (void)location; (void)messageCode; (void)pUserData; (void)pLayerPrefix; // Unused arguemnts
printf("[vulkan] ObjectType: %i\nMessage: %s\n\n", objectType, pMessage);
return VK_FALSE;
}
#endif // IMGUI_VULKAN_DEBUG_REPORT
static void CreateVulkanInstance(const char** extensions, uint32_t extensions_count)
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{
VkResult err;
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// Create Vulkan Instance
{
VkInstanceCreateInfo create_info = {};
create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
create_info.enabledExtensionCount = extensions_count;
create_info.ppEnabledExtensionNames = extensions;
#ifdef IMGUI_VULKAN_DEBUG_REPORT
// Enabling multiple validation layers grouped as LunarG standard validation
const char* layers[] = { "VK_LAYER_LUNARG_standard_validation" };
create_info.enabledLayerCount = 1;
create_info.ppEnabledLayerNames = layers;
// Enable debug report extension (we need additional storage, so we duplicate the user array to add our new extension to it)
const char** extensions_ext = (const char**)malloc(sizeof(const char*) * (extensions_count + 1));
memcpy(extensions_ext, extensions, extensions_count * sizeof(const char*));
extensions_ext[extensions_count] = "VK_EXT_debug_report";
create_info.enabledExtensionCount = extensions_count + 1;
create_info.ppEnabledExtensionNames = extensions_ext;
#endif // IMGUI_VULKAN_DEBUG_REPORT
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err = vkCreateInstance(&create_info, g_Allocator, &g_Instance);
check_vk_result(err);
#ifdef IMGUI_VULKAN_DEBUG_REPORT
free(extensions_ext);
// Get the function pointer (required for any extensions)
auto vkCreateDebugReportCallbackEXT = (PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkCreateDebugReportCallbackEXT");
IM_ASSERT(vkCreateDebugReportCallbackEXT != NULL);
// Setup the debug report callback
VkDebugReportCallbackCreateInfoEXT debug_report_ci = {};
debug_report_ci.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT;
debug_report_ci.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT | VK_DEBUG_REPORT_WARNING_BIT_EXT | VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT;
debug_report_ci.pfnCallback = debug_report;
debug_report_ci.pUserData = NULL;
err = vkCreateDebugReportCallbackEXT(g_Instance, &debug_report_ci, g_Allocator, &g_DebugReport);
check_vk_result(err);
#endif // IMGUI_VULKAN_DEBUG_REPORT
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}
}
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static void SetupVulkan(WindowData* wd)
{
VkResult err;
// Select GPU
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{
uint32_t gpu_count;
err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, NULL);
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check_vk_result(err);
VkPhysicalDevice* gpus = (VkPhysicalDevice*)malloc(sizeof(VkPhysicalDevice) * gpu_count);
err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, gpus);
check_vk_result(err);
// If a number >1 of GPUs got reported, you should find the best fit GPU for your purpose
// e.g. VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU if available, or with the greatest memory available, etc.
// for sake of simplicity we'll just take the first one, assuming it has a graphics queue family.
g_PhysicalDevice = gpus[0];
free(gpus);
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}
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// Select graphics queue family
{
uint32_t count;
vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, NULL);
VkQueueFamilyProperties* queues = (VkQueueFamilyProperties*)malloc(sizeof(VkQueueFamilyProperties) * count);
vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, queues);
for (uint32_t i = 0; i < count; i++)
if (queues[i].queueFlags & VK_QUEUE_GRAPHICS_BIT)
{
g_QueueFamily = i;
break;
}
free(queues);
IM_ASSERT(g_QueueFamily != -1);
}
// Check for WSI support
{
VkBool32 res;
vkGetPhysicalDeviceSurfaceSupportKHR(g_PhysicalDevice, g_QueueFamily, wd->Surface, &res);
if (res != VK_TRUE)
{
fprintf(stderr, "Error no WSI support on physical device 0\n");
exit(-1);
}
}
// Get Surface Format
{
const VkFormat requestSurfaceImageFormat[] = { VK_FORMAT_B8G8R8A8_UNORM, VK_FORMAT_R8G8B8A8_UNORM, VK_FORMAT_B8G8R8_UNORM, VK_FORMAT_R8G8B8_UNORM };
const VkColorSpaceKHR requestSurfaceColorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
wd->SurfaceFormat = ImGui_ImplVulkan_SelectSurfaceFormat(g_PhysicalDevice, wd->Surface, requestSurfaceImageFormat, (size_t)IM_ARRAYSIZE(requestSurfaceImageFormat), requestSurfaceColorSpace);
}
// Get Present Mode
{
#ifdef IMGUI_UNLIMITED_FRAME_RATE
VkPresentModeKHR present_mode = VK_PRESENT_MODE_IMMEDIATE_KHR;
#else
VkPresentModeKHR present_mode = VK_PRESENT_MODE_FIFO_KHR;
#endif
wd->PresentMode = ImGui_ImplVulkan_SelectPresentMode(g_PhysicalDevice, wd->Surface, &present_mode, 1);
}
// Create Logical Device (with 1 queue)
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{
int device_extension_count = 1;
const char* device_extensions[] = { "VK_KHR_swapchain" };
const float queue_priority[] = { 1.0f };
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VkDeviceQueueCreateInfo queue_info[1] = {};
queue_info[0].sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
queue_info[0].queueFamilyIndex = g_QueueFamily;
queue_info[0].queueCount = 1;
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queue_info[0].pQueuePriorities = queue_priority;
VkDeviceCreateInfo create_info = {};
create_info.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
create_info.queueCreateInfoCount = sizeof(queue_info) / sizeof(queue_info[0]);
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create_info.pQueueCreateInfos = queue_info;
create_info.enabledExtensionCount = device_extension_count;
create_info.ppEnabledExtensionNames = device_extensions;
err = vkCreateDevice(g_PhysicalDevice, &create_info, g_Allocator, &g_Device);
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check_vk_result(err);
vkGetDeviceQueue(g_Device, g_QueueFamily, 0, &g_Queue);
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}
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// Create Command Buffers
for (int i = 0; i < IMGUI_VK_QUEUED_FRAMES; i++)
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{
FrameData* fd = &wd->Frames[i];
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{
VkCommandPoolCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
info.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
info.queueFamilyIndex = g_QueueFamily;
err = vkCreateCommandPool(g_Device, &info, g_Allocator, &fd->CommandPool);
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check_vk_result(err);
}
{
VkCommandBufferAllocateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
info.commandPool = fd->CommandPool;
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info.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
info.commandBufferCount = 1;
err = vkAllocateCommandBuffers(g_Device, &info, &fd->CommandBuffer);
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check_vk_result(err);
}
{
VkFenceCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
info.flags = VK_FENCE_CREATE_SIGNALED_BIT;
err = vkCreateFence(g_Device, &info, g_Allocator, &fd->Fence);
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check_vk_result(err);
}
{
VkSemaphoreCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
err = vkCreateSemaphore(g_Device, &info, g_Allocator, &fd->PresentCompleteSemaphore);
check_vk_result(err);
err = vkCreateSemaphore(g_Device, &info, g_Allocator, &fd->RenderCompleteSemaphore);
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check_vk_result(err);
}
}
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// Create Descriptor Pool
{
VkDescriptorPoolSize pool_sizes[] =
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{
{ VK_DESCRIPTOR_TYPE_SAMPLER, 1000 },
{ VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1000 },
{ VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, 1000 },
{ VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1000 },
{ VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER, 1000 },
{ VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, 1000 },
{ VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 1000 },
{ VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1000 },
{ VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, 1000 },
{ VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, 1000 },
{ VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, 1000 }
};
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VkDescriptorPoolCreateInfo pool_info = {};
pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
pool_info.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT;
pool_info.maxSets = 1000 * IM_ARRAYSIZE(pool_sizes);
pool_info.poolSizeCount = (uint32_t)IM_ARRAYSIZE(pool_sizes);
pool_info.pPoolSizes = pool_sizes;
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err = vkCreateDescriptorPool(g_Device, &pool_info, g_Allocator, &g_DescriptorPool);
check_vk_result(err);
}
}
static void cleanup_vulkan()
{
WindowData* wd = &g_WindowData;
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vkDestroyDescriptorPool(g_Device, g_DescriptorPool, g_Allocator);
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for (int i = 0; i < IMGUI_VK_QUEUED_FRAMES; i++)
{
FrameData* fd = &wd->Frames[i];
vkDestroyFence(g_Device, fd->Fence, g_Allocator);
vkFreeCommandBuffers(g_Device, fd->CommandPool, 1, &fd->CommandBuffer);
vkDestroyCommandPool(g_Device, fd->CommandPool, g_Allocator);
vkDestroySemaphore(g_Device, fd->PresentCompleteSemaphore, g_Allocator);
vkDestroySemaphore(g_Device, fd->RenderCompleteSemaphore, g_Allocator);
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}
for (uint32_t i = 0; i < wd->BackBufferCount; i++)
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{
vkDestroyImageView(g_Device, wd->BackBufferView[i], g_Allocator);
vkDestroyFramebuffer(g_Device, wd->Framebuffer[i], g_Allocator);
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}
vkDestroyRenderPass(g_Device, wd->RenderPass, g_Allocator);
vkDestroySwapchainKHR(g_Device, wd->Swapchain, g_Allocator);
vkDestroySurfaceKHR(g_Instance, wd->Surface, g_Allocator);
#ifdef IMGUI_VULKAN_DEBUG_REPORT
// Remove the debug report callback
auto vkDestroyDebugReportCallbackEXT = (PFN_vkDestroyDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkDestroyDebugReportCallbackEXT");
vkDestroyDebugReportCallbackEXT(g_Instance, g_DebugReport, g_Allocator);
#endif // IMGUI_VULKAN_DEBUG_REPORT
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vkDestroyDevice(g_Device, g_Allocator);
vkDestroyInstance(g_Instance, g_Allocator);
}
static void frame_begin(WindowData* wd)
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{
FrameData* fd = &wd->Frames[wd->FrameIndex];
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VkResult err;
for (;;)
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{
err = vkWaitForFences(g_Device, 1, &fd->Fence, VK_TRUE, 100);
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if (err == VK_SUCCESS) break;
if (err == VK_TIMEOUT) continue;
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check_vk_result(err);
}
{
err = vkAcquireNextImageKHR(g_Device, wd->Swapchain, UINT64_MAX, fd->PresentCompleteSemaphore, VK_NULL_HANDLE, &fd->BackbufferIndex);
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check_vk_result(err);
}
{
err = vkResetCommandPool(g_Device, fd->CommandPool, 0);
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check_vk_result(err);
VkCommandBufferBeginInfo info = {};
info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
info.flags |= VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
err = vkBeginCommandBuffer(fd->CommandBuffer, &info);
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check_vk_result(err);
}
{
VkRenderPassBeginInfo info = {};
info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
info.renderPass = wd->RenderPass;
info.framebuffer = wd->Framebuffer[fd->BackbufferIndex];
info.renderArea.extent.width = wd->Width;
info.renderArea.extent.height = wd->Height;
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info.clearValueCount = 1;
info.pClearValues = &wd->ClearValue;
vkCmdBeginRenderPass(fd->CommandBuffer, &info, VK_SUBPASS_CONTENTS_INLINE);
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}
}
static void frame_end(WindowData* wd)
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{
FrameData* fd = &wd->Frames[wd->FrameIndex];
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VkResult err;
vkCmdEndRenderPass(fd->CommandBuffer);
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{
VkPipelineStageFlags wait_stage = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
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VkSubmitInfo info = {};
info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
info.waitSemaphoreCount = 1;
info.pWaitSemaphores = &fd->PresentCompleteSemaphore;
info.pWaitDstStageMask = &wait_stage;
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info.commandBufferCount = 1;
info.pCommandBuffers = &fd->CommandBuffer;
info.signalSemaphoreCount = 1;
info.pSignalSemaphores = &fd->RenderCompleteSemaphore;
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err = vkEndCommandBuffer(fd->CommandBuffer);
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check_vk_result(err);
err = vkResetFences(g_Device, 1, &fd->Fence);
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check_vk_result(err);
err = vkQueueSubmit(g_Queue, 1, &info, fd->Fence);
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check_vk_result(err);
}
}
static void frame_present(WindowData* wd)
{
VkResult err;
// If IMGUI_UNLIMITED_FRAME_RATE is defined we present the latest but one frame. Otherwise we present the latest rendered frame
#ifdef IMGUI_UNLIMITED_FRAME_RATE
uint32_t PresentIndex = (wd->FrameIndex + IMGUI_VK_QUEUED_FRAMES - 1) % IMGUI_VK_QUEUED_FRAMES;
#else
uint32_t PresentIndex = g_FrameIndex;
#endif // IMGUI_UNLIMITED_FRAME_RATE
FrameData* fd = &wd->Frames[PresentIndex];
VkPresentInfoKHR info = {};
info.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
info.waitSemaphoreCount = 1;
info.pWaitSemaphores = &fd->RenderCompleteSemaphore;
info.swapchainCount = 1;
info.pSwapchains = &wd->Swapchain;
info.pImageIndices = &fd->BackbufferIndex;
err = vkQueuePresentKHR(g_Queue, &info);
check_vk_result(err);
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}
static void glfw_error_callback(int error, const char* description)
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{
fprintf(stderr, "Glfw Error %d: %s\n", error, description);
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}
static void glfw_resize_callback(GLFWwindow*, int w, int h)
{
CreateOrResizeSwapChainAndFrameBuffer(&g_WindowData, w, h);
}
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int main(int, char**)
{
// Setup window
glfwSetErrorCallback(glfw_error_callback);
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if (!glfwInit())
return 1;
glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
GLFWwindow* window = glfwCreateWindow(1280, 720, "ImGui Vulkan example", NULL, NULL);
// Setup Vulkan
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if (!glfwVulkanSupported())
{
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printf("GLFW: Vulkan Not Supported\n");
return 1;
}
uint32_t glfw_extensions_count = 0;
const char** glfw_extensions = glfwGetRequiredInstanceExtensions(&glfw_extensions_count);
CreateVulkanInstance(glfw_extensions, glfw_extensions_count);
// Create Window Surface
WindowData* wd = &g_WindowData;
{
VkResult err = glfwCreateWindowSurface(g_Instance, window, g_Allocator, &wd->Surface);
check_vk_result(err);
}
SetupVulkan(wd);
// Create Framebuffers
{
int w, h;
glfwGetFramebufferSize(window, &w, &h);
CreateOrResizeSwapChainAndFrameBuffer(wd, w, h);
glfwSetFramebufferSizeCallback(window, glfw_resize_callback);
}
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// Setup ImGui binding
ImGui::CreateContext();
ImGui_ImplVulkan_InitInfo init_info = {};
init_info.Allocator = g_Allocator;
init_info.PhysicalDevice = g_PhysicalDevice;
init_info.Device = g_Device;
init_info.RenderPass = wd->RenderPass;
init_info.PipelineCache = g_PipelineCache;
init_info.DescriptorPool = g_DescriptorPool;
init_info.CheckVkResultFn = check_vk_result;
ImGuiIO& io = ImGui::GetIO(); (void)io;
//io.ConfigFlags |= ImGuiConfigFlags_MultiViewports;
//io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
ImGui_ImplVulkan_Init(&init_info);
ImGui_ImplGlfw_InitForVulkan(window, true);
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// Setup style
ImGui::StyleColorsDark();
//ImGui::StyleColorsClassic();
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// Load Fonts
// - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
// - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
// - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
// - Read 'misc/fonts/README.txt' for more instructions and details.
// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
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//io.Fonts->AddFontDefault();
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
//io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
//IM_ASSERT(font != NULL);
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// Upload Fonts
{
// Use any command queue
VkCommandPool command_pool = wd->Frames[wd->FrameIndex].CommandPool;
VkCommandBuffer command_buffer = wd->Frames[wd->FrameIndex].CommandBuffer;
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VkResult err;
err = vkResetCommandPool(g_Device, command_pool, 0);
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check_vk_result(err);
VkCommandBufferBeginInfo begin_info = {};
begin_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
begin_info.flags |= VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
err = vkBeginCommandBuffer(command_buffer, &begin_info);
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check_vk_result(err);
ImGui_ImplVulkan_CreateFontsTexture(command_buffer);
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VkSubmitInfo end_info = {};
end_info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
end_info.commandBufferCount = 1;
end_info.pCommandBuffers = &command_buffer;
err = vkEndCommandBuffer(command_buffer);
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check_vk_result(err);
err = vkQueueSubmit(g_Queue, 1, &end_info, VK_NULL_HANDLE);
check_vk_result(err);
err = vkDeviceWaitIdle(g_Device);
check_vk_result(err);
ImGui_ImplVulkan_InvalidateFontUploadObjects();
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}
bool show_demo_window = true;
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bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
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bool swap_chain_has_at_least_one_image = false;
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// Main loop
while (!glfwWindowShouldClose(window))
{
// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
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glfwPollEvents();
ImGui_ImplVulkan_NewFrame();
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ImGui_ImplGlfw_NewFrame();
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// 1. Show a simple window.
// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
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{
static float f = 0.0f;
static int counter = 0;
ImGui::Text("Hello, world!"); // Display some text (you can use a format string too)
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our windows open/close state
ImGui::Checkbox("Another Window", &show_another_window);
if (ImGui::Button("Button")) // Buttons return true when clicked (NB: most widgets return true when edited/activated)
counter++;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
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ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
}
// 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows.
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if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window);
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
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ImGui::End();
}
// 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui!
if (show_demo_window)
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{
ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver); // Normally user code doesn't need/want to call this because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
ImGui::ShowDemoWindow(&show_demo_window);
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}
// Rendering
memcpy(&wd->ClearValue.color.float32[0], &clear_color, 4 * sizeof(float));
frame_begin(wd);
ImGui_ImplVulkan_Render(wd->Frames[wd->FrameIndex].CommandBuffer);
frame_end(wd);
#ifdef IMGUI_UNLIMITED_FRAME_RATE
// When IMGUI_UNLIMITED_FRAME_RATE is defined we render into latest image acquired from the swapchain but we display the image which was rendered before.
// Hence we must render once and increase the FrameIndex without presenting.
if (swap_chain_has_at_least_one_image)
frame_present(wd);
#else
frame_present(wd);
#endif
swap_chain_has_at_least_one_image = true;
wd->FrameIndex = (wd->FrameIndex + 1) % IMGUI_VK_QUEUED_FRAMES;
// FIXME-PLATFORM
ImGui::UpdatePlatformWindows();
ImGui::RenderPlatformWindows();
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}
// Cleanup
VkResult err = vkDeviceWaitIdle(g_Device);
check_vk_result(err);
ImGui_ImplVulkan_Shutdown();
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ImGui_ImplGlfw_Shutdown();
ImGui::DestroyContext();
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cleanup_vulkan();
glfwTerminate();
return 0;
}