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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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18
xo-imgui/src/imgui/VulkanApp.cpp
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@ -216,7 +216,7 @@ VulkanApp::create_swapchain()
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.presentMode = (vsync_enabled_flag_ ? VK_PRESENT_MODE_FIFO_KHR : VK_PRESENT_MODE_IMMEDIATE_KHR);
create_info.clipped = VK_TRUE;
if (vkCreateSwapchainKHR(device_, &create_info, nullptr, &(this->swapchain_)) != VK_SUCCESS) {
@ -564,7 +564,7 @@ VulkanApp::draw_frame()
result = vkQueuePresentKHR(graphics_queue_, &presentInfo);
if (framebuffer_resized_flag_)
if (xswapchain_recreate_flag_)
result = VK_ERROR_OUT_OF_DATE_KHR;
switch (result) {
@ -572,7 +572,6 @@ VulkanApp::draw_frame()
break;
case VK_ERROR_OUT_OF_DATE_KHR:
case VK_SUBOPTIMAL_KHR:
framebuffer_resized_flag_ = false;
this->recreate_xswapchain();
break;
default:
@ -582,6 +581,12 @@ VulkanApp::draw_frame()
this->current_frame_ = (current_frame_ + 1) % c_max_frames_in_flight;
}
void
VulkanApp::update_vsync_enabled(bool flag) {
this->vsync_enabled_flag_ = flag;
this->xswapchain_recreate_flag_ = true;
}
void
VulkanApp::record_command_buffer(VkCommandBuffer cmdbuf, uint32_t image_ix)
{
@ -633,7 +638,7 @@ VulkanApp::record_command_buffer(VkCommandBuffer cmdbuf, uint32_t image_ix)
}
#endif
ImDrawData * draw_data = imgui_draw_frame_(imgui_cx_); (void)draw_data;
ImDrawData * draw_data = imgui_draw_frame_(this, imgui_cx_);
ImGui_ImplVulkan_RenderDrawData(draw_data, cmdbuf);
@ -671,11 +676,14 @@ VulkanApp::recreate_xswapchain()
// wait until device idle before cleaning up resources
vkDeviceWaitIdle(device_);
// remember consistent swapchain state restored
this->xswapchain_recreate_flag_ = false;
// cleanup old xswapchain
this->cleanup_xswapchain();
// create new swapchain
this->create_xswapchain(false);
this->create_xswapchain(false /*create_render_pass_flag*/);
}
void