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Examples: Added SDL+Vulkan example, the abstraction worked here :) (ref #1367)

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This commit is contained in:
omar
2018-02-21 22:41:04 +01:00
parent 387f724d33
commit f67699456c
5 changed files with 1008 additions and 0 deletions
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4
examples/.gitignore vendored
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@@ -33,6 +33,10 @@ sdl_opengl3_example/Debug/*
sdl_opengl3_example/Release/*
sdl_opengl3_example/ipch/*
sdl_opengl3_example/x64/*
sdl_vulkan_example/Debug/*
sdl_vulkan_example/Release/*
sdl_vulkan_example/ipch/*
sdl_vulkan_example/x64/*
vulkan_example/Debug/*
vulkan_example/Release/*
vulkan_example/ipch/*

10
examples/imgui_examples.sln
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@@ -19,6 +19,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "sdl_opengl3_example", "sdl_
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "vulkan_example", "vulkan_example\vulkan_example.vcxproj", "{57E2DF5A-6FC8-45BB-99DD-91A18C646E80}"
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "sdl_vulkan_example", "sdl_vulkan_example\sdl_vulkan_example.vcxproj", "{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Win32 = Debug|Win32
@@ -91,6 +93,14 @@ Global
{57E2DF5A-6FC8-45BB-99DD-91A18C646E80}.Release|Win32.Build.0 = Release|Win32
{57E2DF5A-6FC8-45BB-99DD-91A18C646E80}.Release|x64.ActiveCfg = Release|x64
{57E2DF5A-6FC8-45BB-99DD-91A18C646E80}.Release|x64.Build.0 = Release|x64
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Debug|Win32.ActiveCfg = Debug|Win32
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Debug|Win32.Build.0 = Debug|Win32
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Debug|x64.ActiveCfg = Debug|x64
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Debug|x64.Build.0 = Debug|x64
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Release|Win32.ActiveCfg = Release|Win32
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Release|Win32.Build.0 = Release|Win32
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Release|x64.ActiveCfg = Release|x64
{BAE3D0B5-9695-4EB1-AD0F-75890EB4A3B3}.Release|x64.Build.0 = Release|x64
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE

765
examples/sdl_vulkan_example/main.cpp Normal file
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@@ -0,0 +1,765 @@
// ImGui - standalone example application for SDL2 + Vulkan
// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
#include "imgui.h"
#include "../imgui_impl_sdl2.h"
#include "../imgui_impl_vulkan.h"
#include <stdio.h>
#include <SDL.h>
#include <SDL_vulkan.h>
#include <vulkan/vulkan.h>
#define IMGUI_MAX_POSSIBLE_BACK_BUFFERS 16
#define IMGUI_UNLIMITED_FRAME_RATE
//#ifdef _DEBUG
//#define IMGUI_VULKAN_DEBUG_REPORT
//#endif
static VkAllocationCallbacks* g_Allocator = NULL;
static VkInstance g_Instance = VK_NULL_HANDLE;
static VkSurfaceKHR g_Surface = VK_NULL_HANDLE;
static VkPhysicalDevice g_Gpu = VK_NULL_HANDLE;
static VkDevice g_Device = VK_NULL_HANDLE;
static VkSwapchainKHR g_Swapchain = VK_NULL_HANDLE;
static VkRenderPass g_RenderPass = VK_NULL_HANDLE;
static uint32_t g_QueueFamily = 0;
static VkQueue g_Queue = VK_NULL_HANDLE;
static VkDebugReportCallbackEXT g_Debug_Report = VK_NULL_HANDLE;
static VkSurfaceFormatKHR g_SurfaceFormat;
static VkImageSubresourceRange g_ImageRange = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 };
static VkPresentModeKHR g_PresentMode;
static VkPipelineCache g_PipelineCache = VK_NULL_HANDLE;
static VkDescriptorPool g_DescriptorPool = VK_NULL_HANDLE;
static int fb_width, fb_height;
static uint32_t g_BackbufferIndices[IMGUI_VK_QUEUED_FRAMES]; // keep track of recently rendered swapchain frame indices
static uint32_t g_BackBufferCount = 0;
static VkImage g_BackBuffer[IMGUI_MAX_POSSIBLE_BACK_BUFFERS] = {};
static VkImageView g_BackBufferView[IMGUI_MAX_POSSIBLE_BACK_BUFFERS] = {};
static VkFramebuffer g_Framebuffer[IMGUI_MAX_POSSIBLE_BACK_BUFFERS] = {};
static uint32_t g_FrameIndex = 0;
static VkCommandPool g_CommandPool[IMGUI_VK_QUEUED_FRAMES];
static VkCommandBuffer g_CommandBuffer[IMGUI_VK_QUEUED_FRAMES];
static VkFence g_Fence[IMGUI_VK_QUEUED_FRAMES];
static VkSemaphore g_PresentCompleteSemaphore[IMGUI_VK_QUEUED_FRAMES];
static VkSemaphore g_RenderCompleteSemaphore[IMGUI_VK_QUEUED_FRAMES];
static VkClearValue g_ClearValue = {};
static void check_vk_result(VkResult err)
{
if (err == 0) return;
printf("VkResult %d\n", err);
if (err < 0)
abort();
}
static void resize_vulkan(SDL_Window*, int w, int h)
{
VkResult err;
VkSwapchainKHR old_swapchain = g_Swapchain;
err = vkDeviceWaitIdle(g_Device);
check_vk_result(err);
// Destroy old Framebuffer:
for (uint32_t i = 0; i < g_BackBufferCount; i++)
if (g_BackBufferView[i])
vkDestroyImageView(g_Device, g_BackBufferView[i], g_Allocator);
for (uint32_t i = 0; i < g_BackBufferCount; i++)
if (g_Framebuffer[i])
vkDestroyFramebuffer(g_Device, g_Framebuffer[i], g_Allocator);
if (g_RenderPass)
vkDestroyRenderPass(g_Device, g_RenderPass, g_Allocator);
// Create Swapchain:
{
VkSwapchainCreateInfoKHR info = {};
info.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
info.surface = g_Surface;
info.imageFormat = g_SurfaceFormat.format;
info.imageColorSpace = g_SurfaceFormat.colorSpace;
info.imageArrayLayers = 1;
info.imageUsage |= VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
info.preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
info.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
info.presentMode = g_PresentMode;
info.clipped = VK_TRUE;
info.oldSwapchain = old_swapchain;
VkSurfaceCapabilitiesKHR cap;
err = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(g_Gpu, g_Surface, &cap);
check_vk_result(err);
if (cap.maxImageCount > 0)
info.minImageCount = (cap.minImageCount + 2 < cap.maxImageCount) ? (cap.minImageCount + 2) : cap.maxImageCount;
else
info.minImageCount = cap.minImageCount + 2;
if (cap.currentExtent.width == 0xffffffff)
{
fb_width = w;
fb_height = h;
info.imageExtent.width = fb_width;
info.imageExtent.height = fb_height;
}
else
{
fb_width = cap.currentExtent.width;
fb_height = cap.currentExtent.height;
info.imageExtent.width = fb_width;
info.imageExtent.height = fb_height;
}
err = vkCreateSwapchainKHR(g_Device, &info, g_Allocator, &g_Swapchain);
check_vk_result(err);
err = vkGetSwapchainImagesKHR(g_Device, g_Swapchain, &g_BackBufferCount, NULL);
check_vk_result(err);
err = vkGetSwapchainImagesKHR(g_Device, g_Swapchain, &g_BackBufferCount, g_BackBuffer);
check_vk_result(err);
}
if (old_swapchain)
vkDestroySwapchainKHR(g_Device, old_swapchain, g_Allocator);
// Create the Render Pass:
{
VkAttachmentDescription attachment = {};
attachment.format = g_SurfaceFormat.format;
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;
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, &g_RenderPass);
check_vk_result(err);
}
// Create The Image Views
{
VkImageViewCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
info.viewType = VK_IMAGE_VIEW_TYPE_2D;
info.format = g_SurfaceFormat.format;
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;
info.subresourceRange = g_ImageRange;
for (uint32_t i = 0; i < g_BackBufferCount; i++)
{
info.image = g_BackBuffer[i];
err = vkCreateImageView(g_Device, &info, g_Allocator, &g_BackBufferView[i]);
check_vk_result(err);
}
}
// Create Framebuffer:
{
VkImageView attachment[1];
VkFramebufferCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
info.renderPass = g_RenderPass;
info.attachmentCount = 1;
info.pAttachments = attachment;
info.width = fb_width;
info.height = fb_height;
info.layers = 1;
for (uint32_t i = 0; i < g_BackBufferCount; i++)
{
attachment[0] = g_BackBufferView[i];
err = vkCreateFramebuffer(g_Device, &info, g_Allocator, &g_Framebuffer[i]);
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)
{
printf("[vulkan] ObjectType: %i\nMessage: %s\n\n", objectType, pMessage);
return VK_FALSE;
}
#endif // IMGUI_VULKAN_DEBUG_REPORT
static void setup_vulkan(SDL_Window* window, const char** extensions, uint32_t extensions_count)
{
VkResult err;
// 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;
// need additional storage for char pointer to debug report extension
const char** extensions = (const char**)malloc(sizeof(const char*) * (extensions_count + 1));
for (size_t i = 0; i < extensions_count; i++)
extensions[i] = extensions[i];
extensions[extensions_count] = "VK_EXT_debug_report";
create_info.enabledExtensionCount = extensions_count + 1;
create_info.ppEnabledExtensionNames = extensions;
#endif // IMGUI_VULKAN_DEBUG_REPORT
err = vkCreateInstance(&create_info, g_Allocator, &g_Instance);
check_vk_result(err);
#ifdef IMGUI_VULKAN_DEBUG_REPORT
free(extensions);
// create 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;
// get the proc address of the function pointer, required for used extensions
PFN_vkCreateDebugReportCallbackEXT vkCreateDebugReportCallbackEXT =
(PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkCreateDebugReportCallbackEXT");
err = vkCreateDebugReportCallbackEXT(g_Instance, &debug_report_ci, g_Allocator, &g_Debug_Report);
check_vk_result(err);
#endif // IMGUI_VULKAN_DEBUG_REPORT
}
// Create Window Surface (with SDL)
{
SDL_bool result = SDL_Vulkan_CreateSurface(window, g_Instance, &g_Surface);
if (result == 0)
{
printf("failed to create Vulkan surface\n");
abort();
}
}
// Get GPU
{
uint32_t gpu_count;
err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, NULL);
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_Gpu = gpus[0];
free(gpus);
}
// Get queue
{
uint32_t count;
vkGetPhysicalDeviceQueueFamilyProperties(g_Gpu, &count, NULL);
VkQueueFamilyProperties* queues = (VkQueueFamilyProperties*)malloc(sizeof(VkQueueFamilyProperties) * count);
vkGetPhysicalDeviceQueueFamilyProperties(g_Gpu, &count, queues);
for (uint32_t i = 0; i < count; i++)
{
if (queues[i].queueFlags & VK_QUEUE_GRAPHICS_BIT)
{
g_QueueFamily = i;
break;
}
}
free(queues);
}
// Check for WSI support
{
VkBool32 res;
vkGetPhysicalDeviceSurfaceSupportKHR(g_Gpu, g_QueueFamily, g_Surface, &res);
if (res != VK_TRUE)
{
fprintf(stderr, "Error no WSI support on physical device 0\n");
exit(-1);
}
}
// Get Surface Format
{
// Per Spec Format and View Format are expected to be the same unless VK_IMAGE_CREATE_MUTABLE_BIT was set at image creation
// Assuming that the default behavior is without setting this bit, there is no need for separate Spawchain image and image view format
// additionally several new color spaces were introduced with Vulkan Spec v1.0.40
// hence we must make sure that a format with the mostly available color space, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR, is found and used
uint32_t count;
vkGetPhysicalDeviceSurfaceFormatsKHR(g_Gpu, g_Surface, &count, NULL);
VkSurfaceFormatKHR *formats = (VkSurfaceFormatKHR*)malloc(sizeof(VkSurfaceFormatKHR) * count);
vkGetPhysicalDeviceSurfaceFormatsKHR(g_Gpu, g_Surface, &count, formats);
// first check if only one format, VK_FORMAT_UNDEFINED, is available, which would imply that any format is available
if (count == 1)
{
if (formats[0].format == VK_FORMAT_UNDEFINED)
{
g_SurfaceFormat.format = VK_FORMAT_B8G8R8A8_UNORM;
g_SurfaceFormat.colorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
}
else
{ // no point in searching another format
g_SurfaceFormat = formats[0];
}
}
else
{
// request several formats, the first found will be used
VkFormat requestSurfaceImageFormat[] = { VK_FORMAT_B8G8R8A8_UNORM, VK_FORMAT_R8G8B8A8_UNORM, VK_FORMAT_B8G8R8_UNORM, VK_FORMAT_R8G8B8_UNORM };
VkColorSpaceKHR requestSurfaceColorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
bool requestedFound = false;
for (size_t i = 0; i < sizeof(requestSurfaceImageFormat) / sizeof(requestSurfaceImageFormat[0]); i++)
{
if (requestedFound)
break;
for (uint32_t j = 0; j < count; j++)
{
if (formats[j].format == requestSurfaceImageFormat[i] && formats[j].colorSpace == requestSurfaceColorSpace)
{
g_SurfaceFormat = formats[j];
requestedFound = true;
}
}
}
// if none of the requested image formats could be found, use the first available
if (!requestedFound)
g_SurfaceFormat = formats[0];
}
free(formats);
}
// Get Present Mode
{
// Requst a certain mode and confirm that it is available. If not use VK_PRESENT_MODE_FIFO_KHR which is mandatory
#ifdef IMGUI_UNLIMITED_FRAME_RATE
g_PresentMode = VK_PRESENT_MODE_IMMEDIATE_KHR;
#else
g_PresentMode = VK_PRESENT_MODE_FIFO_KHR;
#endif
uint32_t count = 0;
vkGetPhysicalDeviceSurfacePresentModesKHR(g_Gpu, g_Surface, &count, nullptr);
VkPresentModeKHR* presentModes = (VkPresentModeKHR*)malloc(sizeof(VkQueueFamilyProperties) * count);
vkGetPhysicalDeviceSurfacePresentModesKHR(g_Gpu, g_Surface, &count, presentModes);
bool presentModeAvailable = false;
for (size_t i = 0; i < count; i++)
{
if (presentModes[i] == g_PresentMode)
{
presentModeAvailable = true;
break;
}
}
if (!presentModeAvailable)
g_PresentMode = VK_PRESENT_MODE_FIFO_KHR; // always available
}
// Create Logical Device
{
int device_extension_count = 1;
const char* device_extensions[] = { "VK_KHR_swapchain" };
const uint32_t queue_index = 0;
const uint32_t queue_count = 1;
const float queue_priority[] = { 1.0f };
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 = queue_count;
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]);
create_info.pQueueCreateInfos = queue_info;
create_info.enabledExtensionCount = device_extension_count;
create_info.ppEnabledExtensionNames = device_extensions;
err = vkCreateDevice(g_Gpu, &create_info, g_Allocator, &g_Device);
check_vk_result(err);
vkGetDeviceQueue(g_Device, g_QueueFamily, queue_index, &g_Queue);
}
// Create Framebuffers
{
int w, h;
SDL_GetWindowSize(window, &w, &h);
resize_vulkan(window, w, h);
}
// Create Command Buffers
for (int i = 0; i < IMGUI_VK_QUEUED_FRAMES; i++)
{
{
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, &g_CommandPool[i]);
check_vk_result(err);
}
{
VkCommandBufferAllocateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
info.commandPool = g_CommandPool[i];
info.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
info.commandBufferCount = 1;
err = vkAllocateCommandBuffers(g_Device, &info, &g_CommandBuffer[i]);
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, &g_Fence[i]);
check_vk_result(err);
}
{
VkSemaphoreCreateInfo info = {};
info.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
err = vkCreateSemaphore(g_Device, &info, g_Allocator, &g_PresentCompleteSemaphore[i]);
check_vk_result(err);
err = vkCreateSemaphore(g_Device, &info, g_Allocator, &g_RenderCompleteSemaphore[i]);
check_vk_result(err);
}
}
// Create Descriptor Pool
{
VkDescriptorPoolSize pool_size[11] =
{
{ 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 }
};
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 * 11;
pool_info.poolSizeCount = 11;
pool_info.pPoolSizes = pool_size;
err = vkCreateDescriptorPool(g_Device, &pool_info, g_Allocator, &g_DescriptorPool);
check_vk_result(err);
}
}
static void cleanup_vulkan()
{
vkDestroyDescriptorPool(g_Device, g_DescriptorPool, g_Allocator);
for (int i = 0; i < IMGUI_VK_QUEUED_FRAMES; i++)
{
vkDestroyFence(g_Device, g_Fence[i], g_Allocator);
vkFreeCommandBuffers(g_Device, g_CommandPool[i], 1, &g_CommandBuffer[i]);
vkDestroyCommandPool(g_Device, g_CommandPool[i], g_Allocator);
vkDestroySemaphore(g_Device, g_PresentCompleteSemaphore[i], g_Allocator);
vkDestroySemaphore(g_Device, g_RenderCompleteSemaphore[i], g_Allocator);
}
for (uint32_t i = 0; i < g_BackBufferCount; i++)
{
vkDestroyImageView(g_Device, g_BackBufferView[i], g_Allocator);
vkDestroyFramebuffer(g_Device, g_Framebuffer[i], g_Allocator);
}
vkDestroyRenderPass(g_Device, g_RenderPass, g_Allocator);
vkDestroySwapchainKHR(g_Device, g_Swapchain, g_Allocator);
vkDestroySurfaceKHR(g_Instance, g_Surface, g_Allocator);
#ifdef IMGUI_VULKAN_DEBUG_REPORT
// get the proc address of the function pointer, required for used extensions
auto vkDestroyDebugReportCallbackEXT = (PFN_vkDestroyDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkDestroyDebugReportCallbackEXT");
vkDestroyDebugReportCallbackEXT(g_Instance, g_Debug_Report, g_Allocator);
#endif // IMGUI_VULKAN_DEBUG_REPORT
vkDestroyDevice(g_Device, g_Allocator);
vkDestroyInstance(g_Instance, g_Allocator);
}
static void frame_begin()
{
VkResult err;
for (;;)
{
err = vkWaitForFences(g_Device, 1, &g_Fence[g_FrameIndex], VK_TRUE, 100);
if (err == VK_SUCCESS) break;
if (err == VK_TIMEOUT) continue;
check_vk_result(err);
}
{
err = vkAcquireNextImageKHR(g_Device, g_Swapchain, UINT64_MAX, g_PresentCompleteSemaphore[g_FrameIndex], VK_NULL_HANDLE, &g_BackbufferIndices[g_FrameIndex]);
check_vk_result(err);
}
{
err = vkResetCommandPool(g_Device, g_CommandPool[g_FrameIndex], 0);
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(g_CommandBuffer[g_FrameIndex], &info);
check_vk_result(err);
}
{
VkRenderPassBeginInfo info = {};
info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
info.renderPass = g_RenderPass;
info.framebuffer = g_Framebuffer[g_BackbufferIndices[g_FrameIndex]];
info.renderArea.extent.width = fb_width;
info.renderArea.extent.height = fb_height;
info.clearValueCount = 1;
info.pClearValues = &g_ClearValue;
vkCmdBeginRenderPass(g_CommandBuffer[g_FrameIndex], &info, VK_SUBPASS_CONTENTS_INLINE);
}
}
static void frame_end()
{
VkResult err;
vkCmdEndRenderPass(g_CommandBuffer[g_FrameIndex]);
{
VkPipelineStageFlags wait_stage = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
VkSubmitInfo info = {};
info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
info.waitSemaphoreCount = 1;
info.pWaitSemaphores = &g_PresentCompleteSemaphore[g_FrameIndex];
info.pWaitDstStageMask = &wait_stage;
info.commandBufferCount = 1;
info.pCommandBuffers = &g_CommandBuffer[g_FrameIndex];
info.signalSemaphoreCount = 1;
info.pSignalSemaphores = &g_RenderCompleteSemaphore[g_FrameIndex];
err = vkEndCommandBuffer(g_CommandBuffer[g_FrameIndex]);
check_vk_result(err);
err = vkResetFences(g_Device, 1, &g_Fence[g_FrameIndex]);
check_vk_result(err);
err = vkQueueSubmit(g_Queue, 1, &info, g_Fence[g_FrameIndex]);
check_vk_result(err);
}
}
static void frame_present()
{
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 = (g_FrameIndex + IMGUI_VK_QUEUED_FRAMES - 1) % IMGUI_VK_QUEUED_FRAMES;
#else
uint32_t PresentIndex = g_FrameIndex;
#endif // IMGUI_UNLIMITED_FRAME_RATE
VkSwapchainKHR swapchains[1] = { g_Swapchain };
uint32_t indices[1] = { g_BackbufferIndices[PresentIndex] };
VkPresentInfoKHR info = {};
info.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
info.waitSemaphoreCount = 1;
info.pWaitSemaphores = &g_RenderCompleteSemaphore[PresentIndex];
info.swapchainCount = 1;
info.pSwapchains = swapchains;
info.pImageIndices = indices;
err = vkQueuePresentKHR(g_Queue, &info);
check_vk_result(err);
g_FrameIndex = (g_FrameIndex + 1) % IMGUI_VK_QUEUED_FRAMES;
}
int main(int, char**)
{
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
{
printf("Error: %s\n", SDL_GetError());
return 1;
}
// Setup window
SDL_DisplayMode current;
SDL_GetCurrentDisplayMode(0, &current);
SDL_Window* window = SDL_CreateWindow("ImGui SDL2+Vulkan example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_VULKAN|SDL_WINDOW_RESIZABLE);
// Setup Vulkan
uint32_t extensions_count;
SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, nullptr);
const char** sdl_extensions = new const char*[extensions_count];
SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, sdl_extensions);
setup_vulkan(window, sdl_extensions, extensions_count);
delete[] sdl_extensions;
// Setup ImGui binding
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO(); (void)io;
//io.NavFlags |= ImGuiNavFlags_EnableKeyboard;
ImGui_ImplVulkan_InitData init_data = {};
init_data.allocator = g_Allocator;
init_data.gpu = g_Gpu;
init_data.device = g_Device;
init_data.render_pass = g_RenderPass;
init_data.pipeline_cache = g_PipelineCache;
init_data.descriptor_pool = g_DescriptorPool;
init_data.check_vk_result = check_vk_result;
ImGui_ImplVulkan_Init(&init_data);
ImGui_ImplSDL2_Init(window);
// Setup style
ImGui::StyleColorsDark();
//ImGui::StyleColorsClassic();
// 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 \\ !
//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);
// Upload Fonts
{
VkResult err;
err = vkResetCommandPool(g_Device, g_CommandPool[g_FrameIndex], 0);
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(g_CommandBuffer[g_FrameIndex], &begin_info);
check_vk_result(err);
ImGui_ImplVulkan_CreateFontsTexture(g_CommandBuffer[g_FrameIndex]);
VkSubmitInfo end_info = {};
end_info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
end_info.commandBufferCount = 1;
end_info.pCommandBuffers = &g_CommandBuffer[g_FrameIndex];
err = vkEndCommandBuffer(g_CommandBuffer[g_FrameIndex]);
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();
}
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// 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 g_FrameIndex without presenting, which we do before entering the render loop.
// This is also the reason why frame_end() is split into frame_end() and frame_present(), the later one not being called here.
#ifdef IMGUI_UNLIMITED_FRAME_RATE
ImGui_ImplVulkan_NewFrame();
ImGui_ImplSDL2_NewFrame(window);
frame_begin();
ImGui_ImplVulkan_Render(g_CommandBuffer[g_FrameIndex]);
frame_end();
g_FrameIndex = (g_FrameIndex + 1) % IMGUI_VK_QUEUED_FRAMES;
#endif // IMGUI_UNLIMITED_FRAME_RATE
// Main loop
bool done = false;
while (!done)
{
// 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.
SDL_Event event;
while (SDL_PollEvent(&event))
{
ImGui_ImplSDL2_ProcessEvent(&event);
if (event.type == SDL_QUIT)
done = true;
}
ImGui_ImplVulkan_NewFrame();
ImGui_ImplSDL2_NewFrame(window);
// 1. Show a simple window.
// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
{
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);
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.
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;
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)
{
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);
}
// Rendering
memcpy(&g_ClearValue.color.float32[0], &clear_color, 4 * sizeof(float));
frame_begin();
ImGui_ImplVulkan_Render(g_CommandBuffer[g_FrameIndex]);
frame_end();
frame_present();
}
// Cleanup
VkResult err = vkDeviceWaitIdle(g_Device);
check_vk_result(err);
ImGui_ImplVulkan_Shutdown();
ImGui_ImplSDL2_Shutdown();
ImGui::DestroyContext();
SDL_DestroyWindow(window);
cleanup_vulkan();
SDL_Quit();
return 0;
}

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