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xo-imgui: support dynamic vsync_enabled setting + demo in ex4

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This commit is contained in:
Roland Conybeare 2025-11-12 13:33:20 -05:00
commit b4a8ecd7d6
5 changed files with 58 additions and 14 deletions
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31
xo-imgui/include/xo/imgui/VulkanApp.hpp
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@ -13,7 +13,7 @@
class VulkanApp {
public:
using ImguiDrawFn = std::function<ImDrawData * (ImGuiContext *)>;
using ImguiDrawFn = std::function<ImDrawData * (VulkanApp *, ImGuiContext *)>;
public:
/* create single-window vulkan application;
@ -21,9 +21,17 @@ public:
*/
VulkanApp(ImguiDrawFn fn);
bool vsync_enabled_flag() const { return vsync_enabled_flag_; }
/* update vsync enabled (will recreate xswapchain at next opportunity)
*/
void update_vsync_enabled(bool flag);
/* run application; borrows calling thread for event loop,
* until application exit.
* Invoke load_fonts once imgui context established
* @ref vsync_enabled_flag_. true for VK_PRESENT_MODE_FIFO_KHR;
* false for VK_PRESENT_MODE_IMMEDIATE_KHR
*/
void run(std::function<void (ImGuiContext *)> load_fonts);
@ -47,7 +55,10 @@ private:
*/
void init_sdl_window();
/* setup vulkan state. swapchain, command buffers etc */
/* setup vulkan state. swapchain, command buffers etc
* @ref vsync_enabled_flag_. true for VK_PRESENT_MODE_FIFO_KHR;
* false for VK_PRESENT_MODE_IMMEDIATE_KHR
*/
void init_vulkan();
/* create vulkan instance.
@ -74,6 +85,8 @@ private:
/* populates @ref swapchain_, @ref swapchain_images_,
* @ref swapchain_image_views_, @ref framebuffers_.
* Also $ref render_pass_ iff @p create_render_pass_flag
* @ref vsync_enabled_flag_. true for VK_PRESENT_MODE_FIFO_KHR;
* false for VK_PRESENT_MODE_IMMEDIATE_KHR
*/
void create_xswapchain(bool create_render_pass_flag);
@ -175,6 +188,10 @@ private:
/* abstraction for presentation area (?) */
VkSurfaceKHR surface_;
/* true -> VK_PRESENT_MODE_FIFO_KHR
* false -> VK_PRESENT_MODE_IMMEDIATE_KHR
*/
bool vsync_enabled_flag_ = true;
/* physical device (graphics card) */
VkPhysicalDevice physical_device_;
@ -210,10 +227,14 @@ private:
const size_t c_max_frames_in_flight = 2;
/* true iff @ref setup has been called */
bool setup_flag_ = false;
/* true when window resize behavior detected,
* until swapchain in consistent state.
/* true if xswapchain is out-of-date.
* reset when xswapchain recreated (and therefore in consistent state).
*
* Triggered by:
* - window resize
* - vsync toggled
*/
bool framebuffer_resized_flag_ = false;
bool xswapchain_recreate_flag_ = false;
bool quit_flag_ = false;
/** draw imgui **/