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xo-imgui: refactor ex4a: create_swapchain() -> .cpp

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This commit is contained in:
Roland Conybeare 2025-11-11 09:52:15 -05:00
commit 08257f19fd
2 changed files with 70 additions and 60 deletions
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50
xo-imgui/example/ex4a/VulkanApp.cpp
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@ -165,4 +165,54 @@ MinimalImGuiVulkan::create_logical_device()
vkGetDeviceQueue(device_, graphics_queue_family_, 0, &graphics_queue_);
}
void
MinimalImGuiVulkan::create_swapchain()
{
VkSurfaceCapabilitiesKHR capabilities;
vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_device_, surface_, &capabilities);
uint32_t n_format;
vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device_, surface_, &n_format, nullptr);
std::vector<VkSurfaceFormatKHR> formats(n_format);
vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device_, surface_, &n_format, formats.data());
VkSurfaceFormatKHR surface_format = formats[0];
this->swapchain_image_format_ = surface_format.format;
int width, height;
SDL_Vulkan_GetDrawableSize(window_, &width, &height);
this->swapchain_extent_ = {
static_cast<uint32_t>(width),
static_cast<uint32_t>(height)
};
uint32_t n_image = capabilities.minImageCount + 1;
if (capabilities.maxImageCount > 0 && n_image > capabilities.maxImageCount) {
n_image = capabilities.maxImageCount;
}
VkSwapchainCreateInfoKHR create_info{};
create_info.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
create_info.surface = surface_;
create_info.minImageCount = n_image;
create_info.imageFormat = surface_format.format;
create_info.imageColorSpace = surface_format.colorSpace;
create_info.imageExtent = swapchain_extent_;
create_info.imageArrayLayers = 1;
create_info.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
create_info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
create_info.preTransform = capabilities.currentTransform;
create_info.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
create_info.presentMode = VK_PRESENT_MODE_FIFO_KHR;
create_info.clipped = VK_TRUE;
if (vkCreateSwapchainKHR(device_, &create_info, nullptr, &(this->swapchain_)) != VK_SUCCESS) {
throw std::runtime_error("Failed to create swap chain!");
}
vkGetSwapchainImagesKHR(device_, swapchain_, &n_image, nullptr);
this->swapchain_images_.resize(n_image);
vkGetSwapchainImagesKHR(device_, swapchain_, &n_image, this->swapchain_images_.data());
}
/* end VulkanApp.cpp */