video_out: HDR support (#2381)

* Initial HDR support

* fix for crashes when debug tools used

src/imgui/renderer/imgui_core.cpp

@@ -118,6 +118,10 @@ void OnResize() {
     Sdl::OnResize();
 }
 
+void OnSurfaceFormatChange(vk::Format surface_format) {
+    Vulkan::OnSurfaceFormatChange(surface_format);
+}
+
 void Shutdown(const vk::Device& device) {
     auto result = device.waitIdle();
     if (result != vk::Result::eSuccess) {

src/imgui/renderer/imgui_core.h

@@ -22,6 +22,8 @@ void Initialize(const Vulkan::Instance& instance, const Frontend::WindowSDL& win
 
 void OnResize();
 
+void OnSurfaceFormatChange(vk::Format surface_format);
+
 void Shutdown(const vk::Device& device);
 
 bool ProcessEvent(SDL_Event* event);

src/imgui/renderer/imgui_impl_vulkan.cpp

@@ -1265,4 +1265,20 @@ void Shutdown() {
     IM_DELETE(bd);
 }
 
+void OnSurfaceFormatChange(vk::Format surface_format) {
+    VkData* bd = GetBackendData();
+    const InitInfo& v = bd->init_info;
+    auto& pl_format = const_cast<vk::Format&>(
+        bd->init_info.pipeline_rendering_create_info.pColorAttachmentFormats[0]);
+    if (pl_format != surface_format) {
+        pl_format = surface_format;
+        if (bd->pipeline) {
+            v.device.destroyPipeline(bd->pipeline, v.allocator);
+            bd->pipeline = VK_NULL_HANDLE;
+            CreatePipeline(v.device, v.allocator, v.pipeline_cache, nullptr, &bd->pipeline,
+                           v.subpass);
+        }
+    }
+}
+
 } // namespace ImGui::Vulkan

src/imgui/renderer/imgui_impl_vulkan.h

@@ -67,5 +67,6 @@ void RenderDrawData(ImDrawData& draw_data, vk::CommandBuffer command_buffer,
                     vk::Pipeline pipeline = VK_NULL_HANDLE);
 
 void SetBlendEnabled(bool enabled);
+void OnSurfaceFormatChange(vk::Format surface_format);
 
-} // namespace ImGui::Vulkan
+} // namespace ImGui::Vulkan