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xo-imgui: refactor: move create_instance to .cpp + streamline

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This commit is contained in:
Roland Conybeare 2025-11-11 00:42:51 -05:00
commit 425fe3c764
3 changed files with 65 additions and 59 deletions
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2
README.md
View file

@ -53,7 +53,7 @@ $ cmake -B .build0 -S xo-cmake -DCMAKE_INSTALL_PREFIX=${PREFIX}
$ cmake --build .build0
$ cmake --install .build0
# phase 2
$ cmake -B .build -S . -DCMAKE_INSTALL_PREFIX=${PREFIX} -DXO_ENABLE_EXAMPLES=1
$ cmake -B .build -S . -DCMAKE_INSTALL_PREFIX=${PREFIX} -DXO_ENABLE_EXAMPLES=1 -DCMAKE_BUILD_TYPE=debug
$ cmake --build .build --verbose
$ cmake --install .build
```

53
xo-imgui/example/ex4a/VulkanApp.cpp
View file

@ -36,14 +36,59 @@ MinimalImGuiVulkan::init_vulkan() {
this->create_surface();
this->pick_physical_device();
this->create_logical_device();
this->createSwapchain();
this->createImageViews();
this->createRenderPass(); // must come before createFrameBuffers
this->createFramebuffers();
this->create_swapchain();
this->create_image_views();
this->create_render_pass(); // must come before createFrameBuffers
this->create_framebuffers();
this->create_command_pool();
this->create_command_buffers();
this->create_sync_objects();
this->create_descriptor_pool();
}
void
MinimalImGuiVulkan::create_instance() {
VkApplicationInfo appInfo{};
appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
appInfo.pApplicationName = "ImGui Vulkan App";
appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
appInfo.pEngineName = "No Engine";
appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
appInfo.apiVersion = VK_API_VERSION_1_0;
VkInstanceCreateInfo createInfo{};
createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
createInfo.pApplicationInfo = &appInfo;
uint32_t extensionCount = 0;
if (!SDL_Vulkan_GetInstanceExtensions(window_, &extensionCount, nullptr)) {
throw std::runtime_error("Failed to get SDL Vulkan extensions!");
}
std::vector<const char*> extensions(extensionCount);
if (!SDL_Vulkan_GetInstanceExtensions(window_, &extensionCount, extensions.data())) {
throw std::runtime_error("Failed to get SDL Vulkan extensions!");
}
#ifdef __apple__
// Add portability extension for MoltenVK (macOS)
extensions.push_back(VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME);
#endif
createInfo.enabledExtensionCount = extensions.size();
createInfo.ppEnabledExtensionNames = extensions.data();
createInfo.enabledLayerCount = 0;
#ifdef __apple__
// CRITICAL: Enable portability enumeration flag for MoltenVK
createInfo.flags |= VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
#endif
int result = vkCreateInstance(&createInfo, nullptr, &(this->instance_));
if (result != VK_SUCCESS) {
printf("vkCreateInstance failed with error: %d\n", result);
throw std::runtime_error("Failed to create instance!");
}
}
/* end VulkanApp.cpp */

69
xo-imgui/example/ex4a/VulkanApp.hpp
View file

@ -19,56 +19,17 @@ public:
private:
/* create SDL window for application.
* populates @p window_
* populates @ref window_
*/
void init_sdl_window();
/* setup vulkan state. swapchain, command buffers etc */
void init_vulkan();
void create_instance() {
VkApplicationInfo appInfo{};
appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
appInfo.pApplicationName = "ImGui Vulkan App";
appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
appInfo.pEngineName = "No Engine";
appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
appInfo.apiVersion = VK_API_VERSION_1_0;
VkInstanceCreateInfo createInfo{};
createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
createInfo.pApplicationInfo = &appInfo;
uint32_t extensionCount = 0;
if (!SDL_Vulkan_GetInstanceExtensions(window_, &extensionCount, nullptr)) {
throw std::runtime_error("Failed to get SDL Vulkan extensions!");
}
std::vector<const char*> extensions(extensionCount);
if (!SDL_Vulkan_GetInstanceExtensions(window_, &extensionCount, extensions.data())) {
throw std::runtime_error("Failed to get SDL Vulkan extensions!");
}
#ifdef __apple__
// Add portability extension for MoltenVK (macOS)
extensions.push_back(VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME);
#endif
createInfo.enabledExtensionCount = extensions.size();
createInfo.ppEnabledExtensionNames = extensions.data();
createInfo.enabledLayerCount = 0;
#ifdef __apple__
// CRITICAL: Enable portability enumeration flag for MoltenVK
createInfo.flags |= VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
#endif
int result = vkCreateInstance(&createInfo, nullptr, &(this->instance_));
if (result != VK_SUCCESS) {
printf("vkCreateInstance failed with error: %d\n", result);
throw std::runtime_error("Failed to create instance!");
}
}
/* create vulkan instance.
* populates @ref instance_
*/
void create_instance();
void create_surface() {
if (!SDL_Vulkan_CreateSurface(window_, instance_, &surface)) {
@ -134,7 +95,7 @@ private:
vkGetDeviceQueue(device, graphicsQueueFamily, 0, &graphicsQueue);
}
void createSwapchain() {
void create_swapchain() {
VkSurfaceCapabilitiesKHR capabilities;
vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_device_, surface, &capabilities);
@ -179,7 +140,7 @@ private:
vkGetSwapchainImagesKHR(device, swapchain, &imageCount, swapchainImages.data());
}
void createImageViews() {
void create_image_views() {
swapchainImageViews.resize(swapchainImages.size());
for (size_t i = 0; i < swapchainImages.size(); i++) {
@ -204,7 +165,7 @@ private:
}
}
void createRenderPass() {
void create_render_pass() {
VkAttachmentDescription colorAttachment{};
colorAttachment.format = swapchainImageFormat;
colorAttachment.samples = VK_SAMPLE_COUNT_1_BIT;
@ -246,7 +207,7 @@ private:
}
}
void createFramebuffers() {
void create_framebuffers() {
framebuffers.resize(swapchainImageViews.size());
for (size_t i = 0; i < swapchainImageViews.size(); i++) {
@ -441,7 +402,7 @@ private:
case VK_SUBOPTIMAL_KHR:
break;
case VK_ERROR_OUT_OF_DATE_KHR:
recreateSwapchain();
recreate_swapchain();
// deliberate earlyexit
return;
default:
@ -497,7 +458,7 @@ private:
case VK_ERROR_OUT_OF_DATE_KHR:
case VK_SUBOPTIMAL_KHR:
framebuffer_resized_flag_ = false;
this->recreateSwapchain();
this->recreate_swapchain();
break;
default:
throw std::runtime_error("failed to present swapchain image!");
@ -557,7 +518,7 @@ private:
}
}
void recreateSwapchain() {
void recreate_swapchain() {
// handle window minimization: wait until window has valid size
int width = 0;
int height = 0;
@ -576,9 +537,9 @@ private:
this->cleanupSwapchain();
// create new swapchain
this->createSwapchain();
this->createImageViews();
this->createFramebuffers();
this->create_swapchain();
this->create_image_views();
this->create_framebuffers();
}
void cleanupFrameBuffers() {