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ShaderPlayground / deps / imgui / imgui / examples / example_sdl2_vulkan / main.cpp
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1// Dear ImGui: standalone example application for SDL2 + Vulkan
2
3// Learn about Dear ImGui:
4// - FAQ https://dearimgui.com/faq
5// - Getting Started https://dearimgui.com/getting-started
6// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
7// - Introduction, links and more at the top of imgui.cpp
8
9// Important note to the reader who wish to integrate imgui_impl_vulkan.cpp/.h in their own engine/app.
10// - Common ImGui_ImplVulkan_XXX functions and structures are used to interface with imgui_impl_vulkan.cpp/.h.
11// You will use those if you want to use this rendering backend in your engine/app.
12// - Helper ImGui_ImplVulkanH_XXX functions and structures are only used by this example (main.cpp) and by
13// the backend itself (imgui_impl_vulkan.cpp), but should PROBABLY NOT be used by your own engine/app code.
14// Read comments in imgui_impl_vulkan.h.
15
16#include "imgui.h"
17#include "imgui_impl_sdl2.h"
18#include "imgui_impl_vulkan.h"
19#include <stdio.h> // printf, fprintf
20#include <stdlib.h> // abort
21#include <SDL.h>
22#include <SDL_vulkan.h>
23#ifdef _WIN32
24#include <windows.h> // SetProcessDPIAware()
25#endif
26
27// Volk headers
28#ifdef IMGUI_IMPL_VULKAN_USE_VOLK
29#define VOLK_IMPLEMENTATION
30#include <volk.h>
31#endif
32
33//#define APP_USE_UNLIMITED_FRAME_RATE
34#ifdef _DEBUG
35#define APP_USE_VULKAN_DEBUG_REPORT
36static VkDebugReportCallbackEXT g_DebugReport = VK_NULL_HANDLE;
37#endif
38
39// Data
40static VkAllocationCallbacks* g_Allocator = nullptr;
41static VkInstance g_Instance = VK_NULL_HANDLE;
42static VkPhysicalDevice g_PhysicalDevice = VK_NULL_HANDLE;
43static VkDevice g_Device = VK_NULL_HANDLE;
44static uint32_t g_QueueFamily = (uint32_t)-1;
45static VkQueue g_Queue = VK_NULL_HANDLE;
46static VkPipelineCache g_PipelineCache = VK_NULL_HANDLE;
47static VkDescriptorPool g_DescriptorPool = VK_NULL_HANDLE;
48
49static ImGui_ImplVulkanH_Window g_MainWindowData;
50static uint32_t g_MinImageCount = 2;
51static bool g_SwapChainRebuild = false;
52
53static void check_vk_result(VkResult err)
54{
55 if (err == VK_SUCCESS)
56 return;
57 fprintf(stderr, "[vulkan] Error: VkResult = %d\n", err);
58 if (err < 0)
59 abort();
60}
61
62#ifdef APP_USE_VULKAN_DEBUG_REPORT
63static 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)
64{
65 (void)flags; (void)object; (void)location; (void)messageCode; (void)pUserData; (void)pLayerPrefix; // Unused arguments
66 fprintf(stderr, "[vulkan] Debug report from ObjectType: %i\nMessage: %s\n\n", objectType, pMessage);
67 return VK_FALSE;
68}
69#endif // APP_USE_VULKAN_DEBUG_REPORT
70
71static bool IsExtensionAvailable(const ImVector<VkExtensionProperties>& properties, const char* extension)
72{
73 for (const VkExtensionProperties& p : properties)
74 if (strcmp(p.extensionName, extension) == 0)
75 return true;
76 return false;
77}
78
79static void SetupVulkan(ImVector<const char*> instance_extensions)
80{
81 VkResult err;
82#ifdef IMGUI_IMPL_VULKAN_USE_VOLK
83 volkInitialize();
84#endif
85
86 // Create Vulkan Instance
87 {
88 VkInstanceCreateInfo create_info = {};
89 create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
90
91 // Enumerate available extensions
92 uint32_t properties_count;
93 ImVector<VkExtensionProperties> properties;
94 vkEnumerateInstanceExtensionProperties(nullptr, &properties_count, nullptr);
95 properties.resize(properties_count);
96 err = vkEnumerateInstanceExtensionProperties(nullptr, &properties_count, properties.Data);
97 check_vk_result(err);
98
99 // Enable required extensions
100 if (IsExtensionAvailable(properties, VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME))
101 instance_extensions.push_back(VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME);
102#ifdef VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME
103 if (IsExtensionAvailable(properties, VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME))
104 {
105 instance_extensions.push_back(VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME);
106 create_info.flags |= VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
107 }
108#endif
109
110 // Enabling validation layers
111#ifdef APP_USE_VULKAN_DEBUG_REPORT
112 const char* layers[] = { "VK_LAYER_KHRONOS_validation" };
113 create_info.enabledLayerCount = 1;
114 create_info.ppEnabledLayerNames = layers;
115 instance_extensions.push_back("VK_EXT_debug_report");
116#endif
117
118 // Create Vulkan Instance
119 create_info.enabledExtensionCount = (uint32_t)instance_extensions.Size;
120 create_info.ppEnabledExtensionNames = instance_extensions.Data;
121 err = vkCreateInstance(&create_info, g_Allocator, &g_Instance);
122 check_vk_result(err);
123#ifdef IMGUI_IMPL_VULKAN_USE_VOLK
124 volkLoadInstance(g_Instance);
125#endif
126
127 // Setup the debug report callback
128#ifdef APP_USE_VULKAN_DEBUG_REPORT
129 auto f_vkCreateDebugReportCallbackEXT = (PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkCreateDebugReportCallbackEXT");
130 IM_ASSERT(f_vkCreateDebugReportCallbackEXT != nullptr);
131 VkDebugReportCallbackCreateInfoEXT debug_report_ci = {};
132 debug_report_ci.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT;
133 debug_report_ci.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT | VK_DEBUG_REPORT_WARNING_BIT_EXT | VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT;
134 debug_report_ci.pfnCallback = debug_report;
135 debug_report_ci.pUserData = nullptr;
136 err = f_vkCreateDebugReportCallbackEXT(g_Instance, &debug_report_ci, g_Allocator, &g_DebugReport);
137 check_vk_result(err);
138#endif
139 }
140
141 // Select Physical Device (GPU)
142 g_PhysicalDevice = ImGui_ImplVulkanH_SelectPhysicalDevice(g_Instance);
143 IM_ASSERT(g_PhysicalDevice != VK_NULL_HANDLE);
144
145 // Select graphics queue family
146 g_QueueFamily = ImGui_ImplVulkanH_SelectQueueFamilyIndex(g_PhysicalDevice);
147 IM_ASSERT(g_QueueFamily != (uint32_t)-1);
148
149 // Create Logical Device (with 1 queue)
150 {
151 ImVector<const char*> device_extensions;
152 device_extensions.push_back("VK_KHR_swapchain");
153
154 // Enumerate physical device extension
155 uint32_t properties_count;
156 ImVector<VkExtensionProperties> properties;
157 vkEnumerateDeviceExtensionProperties(g_PhysicalDevice, nullptr, &properties_count, nullptr);
158 properties.resize(properties_count);
159 vkEnumerateDeviceExtensionProperties(g_PhysicalDevice, nullptr, &properties_count, properties.Data);
160#ifdef VK_KHR_PORTABILITY_SUBSET_EXTENSION_NAME
161 if (IsExtensionAvailable(properties, VK_KHR_PORTABILITY_SUBSET_EXTENSION_NAME))
162 device_extensions.push_back(VK_KHR_PORTABILITY_SUBSET_EXTENSION_NAME);
163#endif
164
165 const float queue_priority[] = { 1.0f };
166 VkDeviceQueueCreateInfo queue_info[1] = {};
167 queue_info[0].sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
168 queue_info[0].queueFamilyIndex = g_QueueFamily;
169 queue_info[0].queueCount = 1;
170 queue_info[0].pQueuePriorities = queue_priority;
171 VkDeviceCreateInfo create_info = {};
172 create_info.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
173 create_info.queueCreateInfoCount = sizeof(queue_info) / sizeof(queue_info[0]);
174 create_info.pQueueCreateInfos = queue_info;
175 create_info.enabledExtensionCount = (uint32_t)device_extensions.Size;
176 create_info.ppEnabledExtensionNames = device_extensions.Data;
177 err = vkCreateDevice(g_PhysicalDevice, &create_info, g_Allocator, &g_Device);
178 check_vk_result(err);
179 vkGetDeviceQueue(g_Device, g_QueueFamily, 0, &g_Queue);
180 }
181
182 // Create Descriptor Pool
183 // If you wish to load e.g. additional textures you may need to alter pools sizes and maxSets.
184 {
185 VkDescriptorPoolSize pool_sizes[] =
186 {
187 { VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLED_IMAGE_POOL_SIZE },
188 { VK_DESCRIPTOR_TYPE_SAMPLER, IMGUI_IMPL_VULKAN_MINIMUM_SAMPLER_POOL_SIZE },
189 };
190 VkDescriptorPoolCreateInfo pool_info = {};
191 pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
192 pool_info.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT;
193 pool_info.maxSets = 0;
194 for (VkDescriptorPoolSize& pool_size : pool_sizes)
195 pool_info.maxSets += pool_size.descriptorCount;
196 pool_info.poolSizeCount = (uint32_t)IM_COUNTOF(pool_sizes);
197 pool_info.pPoolSizes = pool_sizes;
198 err = vkCreateDescriptorPool(g_Device, &pool_info, g_Allocator, &g_DescriptorPool);
199 check_vk_result(err);
200 }
201}
202
203// All the ImGui_ImplVulkanH_XXX structures/functions are optional helpers used by the demo.
204// Your real engine/app may not use them.
205static void SetupVulkanWindow(ImGui_ImplVulkanH_Window* wd, VkSurfaceKHR surface, int width, int height)
206{
207 // Check for WSI support
208 VkBool32 res;
209 vkGetPhysicalDeviceSurfaceSupportKHR(g_PhysicalDevice, g_QueueFamily, surface, &res);
210 if (res != VK_TRUE)
211 {
212 fprintf(stderr, "Error no WSI support on physical device 0\n");
213 exit(-1);
214 }
215
216 // Select Surface Format
217 const VkFormat requestSurfaceImageFormat[] = { VK_FORMAT_B8G8R8A8_UNORM, VK_FORMAT_R8G8B8A8_UNORM, VK_FORMAT_B8G8R8_UNORM, VK_FORMAT_R8G8B8_UNORM };
218 const VkColorSpaceKHR requestSurfaceColorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
219 wd->Surface = surface;
220 wd->SurfaceFormat = ImGui_ImplVulkanH_SelectSurfaceFormat(g_PhysicalDevice, wd->Surface, requestSurfaceImageFormat, (size_t)IM_COUNTOF(requestSurfaceImageFormat), requestSurfaceColorSpace);
221
222 // Select Present Mode
223#ifdef APP_USE_UNLIMITED_FRAME_RATE
224 VkPresentModeKHR present_modes[] = { VK_PRESENT_MODE_MAILBOX_KHR, VK_PRESENT_MODE_IMMEDIATE_KHR, VK_PRESENT_MODE_FIFO_KHR };
225#else
226 VkPresentModeKHR present_modes[] = { VK_PRESENT_MODE_FIFO_KHR };
227#endif
228 wd->PresentMode = ImGui_ImplVulkanH_SelectPresentMode(g_PhysicalDevice, wd->Surface, &present_modes[0], IM_COUNTOF(present_modes));
229 //printf("[vulkan] Selected PresentMode = %d\n", wd->PresentMode);
230
231 // Create SwapChain, RenderPass, Framebuffer, etc.
232 IM_ASSERT(g_MinImageCount >= 2);
233 ImGui_ImplVulkanH_CreateOrResizeWindow(g_Instance, g_PhysicalDevice, g_Device, wd, g_QueueFamily, g_Allocator, width, height, g_MinImageCount, 0);
234}
235
236static void CleanupVulkan()
237{
238 vkDestroyDescriptorPool(g_Device, g_DescriptorPool, g_Allocator);
239
240#ifdef APP_USE_VULKAN_DEBUG_REPORT
241 // Remove the debug report callback
242 auto f_vkDestroyDebugReportCallbackEXT = (PFN_vkDestroyDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkDestroyDebugReportCallbackEXT");
243 f_vkDestroyDebugReportCallbackEXT(g_Instance, g_DebugReport, g_Allocator);
244#endif // APP_USE_VULKAN_DEBUG_REPORT
245
246 vkDestroyDevice(g_Device, g_Allocator);
247 vkDestroyInstance(g_Instance, g_Allocator);
248}
249
250static void CleanupVulkanWindow(ImGui_ImplVulkanH_Window* wd)
251{
252 ImGui_ImplVulkanH_DestroyWindow(g_Instance, g_Device, wd, g_Allocator);
253 vkDestroySurfaceKHR(g_Instance, wd->Surface, g_Allocator);
254}
255
256static void FrameRender(ImGui_ImplVulkanH_Window* wd, ImDrawData* draw_data)
257{
258 VkSemaphore image_acquired_semaphore = wd->FrameSemaphores[wd->SemaphoreIndex].ImageAcquiredSemaphore;
259 VkSemaphore render_complete_semaphore = wd->FrameSemaphores[wd->SemaphoreIndex].RenderCompleteSemaphore;
260 VkResult err = vkAcquireNextImageKHR(g_Device, wd->Swapchain, UINT64_MAX, image_acquired_semaphore, VK_NULL_HANDLE, &wd->FrameIndex);
261 if (err == VK_ERROR_OUT_OF_DATE_KHR || err == VK_SUBOPTIMAL_KHR)
262 g_SwapChainRebuild = true;
263 if (err == VK_ERROR_OUT_OF_DATE_KHR)
264 return;
265 if (err != VK_SUBOPTIMAL_KHR)
266 check_vk_result(err);
267
268 ImGui_ImplVulkanH_Frame* fd = &wd->Frames[wd->FrameIndex];
269 {
270 err = vkWaitForFences(g_Device, 1, &fd->Fence, VK_TRUE, UINT64_MAX); // wait indefinitely instead of periodically checking
271 check_vk_result(err);
272
273 err = vkResetFences(g_Device, 1, &fd->Fence);
274 check_vk_result(err);
275 }
276 {
277 err = vkResetCommandPool(g_Device, fd->CommandPool, 0);
278 check_vk_result(err);
279 VkCommandBufferBeginInfo info = {};
280 info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
281 info.flags |= VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
282 err = vkBeginCommandBuffer(fd->CommandBuffer, &info);
283 check_vk_result(err);
284 }
285 {
286 VkRenderPassBeginInfo info = {};
287 info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
288 info.renderPass = wd->RenderPass;
289 info.framebuffer = fd->Framebuffer;
290 info.renderArea.extent.width = wd->Width;
291 info.renderArea.extent.height = wd->Height;
292 info.clearValueCount = 1;
293 info.pClearValues = &wd->ClearValue;
294 vkCmdBeginRenderPass(fd->CommandBuffer, &info, VK_SUBPASS_CONTENTS_INLINE);
295 }
296
297 // Record dear imgui primitives into command buffer
298 ImGui_ImplVulkan_RenderDrawData(draw_data, fd->CommandBuffer);
299
300 // Submit command buffer
301 vkCmdEndRenderPass(fd->CommandBuffer);
302 {
303 VkPipelineStageFlags wait_stage = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
304 VkSubmitInfo info = {};
305 info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
306 info.waitSemaphoreCount = 1;
307 info.pWaitSemaphores = &image_acquired_semaphore;
308 info.pWaitDstStageMask = &wait_stage;
309 info.commandBufferCount = 1;
310 info.pCommandBuffers = &fd->CommandBuffer;
311 info.signalSemaphoreCount = 1;
312 info.pSignalSemaphores = &render_complete_semaphore;
313
314 err = vkEndCommandBuffer(fd->CommandBuffer);
315 check_vk_result(err);
316 err = vkQueueSubmit(g_Queue, 1, &info, fd->Fence);
317 check_vk_result(err);
318 }
319}
320
321static void FramePresent(ImGui_ImplVulkanH_Window* wd)
322{
323 if (g_SwapChainRebuild)
324 return;
325 VkSemaphore render_complete_semaphore = wd->FrameSemaphores[wd->SemaphoreIndex].RenderCompleteSemaphore;
326 VkPresentInfoKHR info = {};
327 info.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
328 info.waitSemaphoreCount = 1;
329 info.pWaitSemaphores = &render_complete_semaphore;
330 info.swapchainCount = 1;
331 info.pSwapchains = &wd->Swapchain;
332 info.pImageIndices = &wd->FrameIndex;
333 VkResult err = vkQueuePresentKHR(g_Queue, &info);
334 if (err == VK_ERROR_OUT_OF_DATE_KHR || err == VK_SUBOPTIMAL_KHR)
335 g_SwapChainRebuild = true;
336 if (err == VK_ERROR_OUT_OF_DATE_KHR)
337 return;
338 if (err != VK_SUBOPTIMAL_KHR)
339 check_vk_result(err);
340 wd->SemaphoreIndex = (wd->SemaphoreIndex + 1) % wd->SemaphoreCount; // Now we can use the next set of semaphores
341}
342
343// Main code
344int main(int, char**)
345{
346 // Setup SDL
347#ifdef _WIN32
348 ::SetProcessDPIAware();
349#endif
350 if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
351 {
352 printf("Error: %s\n", SDL_GetError());
353 return 1;
354 }
355
356 // From 2.0.18: Enable native IME.
357#ifdef SDL_HINT_IME_SHOW_UI
358 SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
359#endif
360
361 // Create window with Vulkan graphics context
362 float main_scale = ImGui_ImplSDL2_GetContentScaleForDisplay(0);
363 SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
364 SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+Vulkan example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, (int)(1280 * main_scale), (int)(800 * main_scale), window_flags);
365 if (window == nullptr)
366 {
367 printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
368 return 1;
369 }
370
371 ImVector<const char*> extensions;
372 uint32_t extensions_count = 0;
373 SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, nullptr);
374 extensions.resize(extensions_count);
375 SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, extensions.Data);
376 SetupVulkan(extensions);
377
378 // Create Window Surface
379 VkSurfaceKHR surface;
380 VkResult err;
381 if (SDL_Vulkan_CreateSurface(window, g_Instance, &surface) == 0)
382 {
383 printf("Failed to create Vulkan surface.\n");
384 return 1;
385 }
386
387 // Create Framebuffers
388 int w, h;
389 SDL_GetWindowSize(window, &w, &h);
390 ImGui_ImplVulkanH_Window* wd = &g_MainWindowData;
391 SetupVulkanWindow(wd, surface, w, h);
392
393 // Setup Dear ImGui context
394 IMGUI_CHECKVERSION();
395 ImGui::CreateContext();
396 ImGuiIO& io = ImGui::GetIO(); (void)io;
397 io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
398 io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
399 io.ConfigFlags |= ImGuiConfigFlags_DockingEnable; // Enable Docking
400 io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows
401 //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoTaskBarIcons;
402 //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoMerge;
403
404 // Setup Dear ImGui style
405 ImGui::StyleColorsDark();
406 //ImGui::StyleColorsLight();
407
408 // Setup scaling
409 ImGuiStyle& style = ImGui::GetStyle();
410 style.ScaleAllSizes(main_scale); // Bake a fixed style scale. (until we have a solution for dynamic style scaling, changing this requires resetting Style + calling this again)
411 style.FontScaleDpi = main_scale; // Set initial font scale. (in docking branch: using io.ConfigDpiScaleFonts=true automatically overrides this for every window depending on the current monitor)
412 io.ConfigDpiScaleFonts = true; // [Experimental] Automatically overwrite style.FontScaleDpi in Begin() when Monitor DPI changes. This will scale fonts but _NOT_ scale sizes/padding for now.
413 io.ConfigDpiScaleViewports = true; // [Experimental] Scale Dear ImGui and Platform Windows when Monitor DPI changes.
414
415 // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
416 if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
417 {
418 style.WindowRounding = 0.0f;
419 style.Colors[ImGuiCol_WindowBg].w = 1.0f;
420 }
421
422 // Setup Platform/Renderer backends
423 ImGui_ImplSDL2_InitForVulkan(window);
424 ImGui_ImplVulkan_InitInfo init_info = {};
425 //init_info.ApiVersion = VK_API_VERSION_1_3; // Pass in your value of VkApplicationInfo::apiVersion, otherwise will default to header version.
426 init_info.Instance = g_Instance;
427 init_info.PhysicalDevice = g_PhysicalDevice;
428 init_info.Device = g_Device;
429 init_info.QueueFamily = g_QueueFamily;
430 init_info.Queue = g_Queue;
431 init_info.PipelineCache = g_PipelineCache;
432 init_info.DescriptorPool = g_DescriptorPool;
433 init_info.MinImageCount = g_MinImageCount;
434 init_info.ImageCount = wd->ImageCount;
435 init_info.Allocator = g_Allocator;
436 init_info.PipelineInfoMain.RenderPass = wd->RenderPass;
437 init_info.PipelineInfoMain.Subpass = 0;
438 init_info.PipelineInfoMain.MSAASamples = VK_SAMPLE_COUNT_1_BIT;
439 init_info.CheckVkResultFn = check_vk_result;
440 ImGui_ImplVulkan_Init(&init_info);
441
442 // Load Fonts
443 // - If fonts are not explicitly loaded, Dear ImGui will select an embedded font: either AddFontDefaultVector() or AddFontDefaultBitmap().
444 // This selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold.
445 // - You can load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
446 // - If a file cannot be loaded, AddFont functions will return a nullptr. Please handle those errors in your code (e.g. use an assertion, display an error and quit).
447 // - Read 'docs/FONTS.md' for more instructions and details.
448 // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use FreeType for higher quality font rendering.
449 // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
450 //style.FontSizeBase = 20.0f;
451 //io.Fonts->AddFontDefaultVector();
452 //io.Fonts->AddFontDefaultBitmap();
453 //io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf");
454 //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf");
455 //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf");
456 //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf");
457 //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf");
458 //IM_ASSERT(font != nullptr);
459
460 // Our state
461 bool show_demo_window = true;
462 bool show_another_window = false;
463 ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
464
465 // Main loop
466 bool done = false;
467 while (!done)
468 {
469 // Poll and handle events (inputs, window resize, etc.)
470 // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
471 // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
472 // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
473 // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
474 SDL_Event event;
475 while (SDL_PollEvent(&event))
476 {
477 ImGui_ImplSDL2_ProcessEvent(&event);
478 if (event.type == SDL_QUIT)
479 done = true;
480 if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
481 done = true;
482 }
483 if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
484 {
485 SDL_Delay(10);
486 continue;
487 }
488
489 // Resize swap chain?
490 int fb_width, fb_height;
491 SDL_GetWindowSize(window, &fb_width, &fb_height);
492 if (fb_width > 0 && fb_height > 0 && (g_SwapChainRebuild || g_MainWindowData.Width != fb_width || g_MainWindowData.Height != fb_height))
493 {
494 ImGui_ImplVulkan_SetMinImageCount(g_MinImageCount);
495 ImGui_ImplVulkanH_CreateOrResizeWindow(g_Instance, g_PhysicalDevice, g_Device, wd, g_QueueFamily, g_Allocator, fb_width, fb_height, g_MinImageCount, 0);
496 g_MainWindowData.FrameIndex = 0;
497 g_SwapChainRebuild = false;
498 }
499
500 // Start the Dear ImGui frame
501 ImGui_ImplVulkan_NewFrame();
502 ImGui_ImplSDL2_NewFrame();
503 ImGui::NewFrame();
504
505 // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
506 if (show_demo_window)
507 ImGui::ShowDemoWindow(&show_demo_window);
508
509 // 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
510 {
511 static float f = 0.0f;
512 static int counter = 0;
513
514 ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
515
516 ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
517 ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
518 ImGui::Checkbox("Another Window", &show_another_window);
519
520 ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
521 ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
522
523 if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
524 counter++;
525 ImGui::SameLine();
526 ImGui::Text("counter = %d", counter);
527
528 ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
529 ImGui::End();
530 }
531
532 // 3. Show another simple window.
533 if (show_another_window)
534 {
535 ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
536 ImGui::Text("Hello from another window!");
537 if (ImGui::Button("Close Me"))
538 show_another_window = false;
539 ImGui::End();
540 }
541
542 // Rendering
543 ImGui::Render();
544 ImDrawData* main_draw_data = ImGui::GetDrawData();
545 const bool main_is_minimized = (main_draw_data->DisplaySize.x <= 0.0f || main_draw_data->DisplaySize.y <= 0.0f);
546 wd->ClearValue.color.float32[0] = clear_color.x * clear_color.w;
547 wd->ClearValue.color.float32[1] = clear_color.y * clear_color.w;
548 wd->ClearValue.color.float32[2] = clear_color.z * clear_color.w;
549 wd->ClearValue.color.float32[3] = clear_color.w;
550 if (!main_is_minimized)
551 FrameRender(wd, main_draw_data);
552
553 // Update and Render additional Platform Windows
554 if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
555 {
556 ImGui::UpdatePlatformWindows();
557 ImGui::RenderPlatformWindowsDefault();
558 }
559
560 // Present Main Platform Window
561 if (!main_is_minimized)
562 FramePresent(wd);
563 }
564
565 // Cleanup
566 err = vkDeviceWaitIdle(g_Device);
567 check_vk_result(err);
568 ImGui_ImplVulkan_Shutdown();
569 ImGui_ImplSDL2_Shutdown();
570 ImGui::DestroyContext();
571
572 CleanupVulkanWindow(&g_MainWindowData);
573 CleanupVulkan();
574
575 SDL_DestroyWindow(window);
576 SDL_Quit();
577
578 return 0;
579}