Re-enable multiviewport

Also fixes a bunch of stuff to make multiviewport way more stable

engine/core/include/engine.hpp

@@ -77,6 +77,8 @@ public:
      */
     void render(const int index);
     
+    void end_frame();
+
     /// Pause updating.
     void pause();
     
@@ -344,12 +346,12 @@ private:
         RenderTarget* render_target;
     };
 
-    std::vector<Window> _windows;
+    std::vector<std::unique_ptr<Window>> _windows;
 
     Window* get_window(const int identifier) {
         for(auto& window : _windows) {
-            if(window.identifier == identifier)
-                return &window;
+            if(window->identifier == identifier)
+                return window.get();
         }
         
         return nullptr;

engine/core/src/engine.cpp

@@ -84,11 +84,11 @@ bool Engine::is_paused() const {
 }
 
 void Engine::quit() {
-    _windows[0].quitRequested = true;
+    _windows[0]->quitRequested = true;
 }
 
 bool Engine::is_quitting() const {
-    return _windows[0].quitRequested;
+    return _windows[0]->quitRequested;
 }
 
 void Engine::prepare_quit() {
@@ -193,7 +193,7 @@ ui::Screen* Engine::load_screen(const file::Path path) {
 void Engine::set_screen(ui::Screen* screen) {
     _current_screen = screen;
     
-    screen->extent = _windows[0].extent;
+    screen->extent = _windows[0]->extent;
     screen->calculate_sizes();
     
     get_renderer()->set_screen(screen);
@@ -414,10 +414,12 @@ void Engine::add_window(void* native_handle, const int identifier, const prism::
     
     _gfx->initialize_view(native_handle, identifier, drawable_extent.width, drawable_extent.height);
 
-    Window& window = _windows.emplace_back();
-    window.identifier = identifier;
-    window.extent = extent;
-    window.render_target = _renderer->allocate_render_target(drawable_extent);
+    _windows.push_back(std::move(std::make_unique<Window>()));
+    
+    Window* window = _windows.back().get();
+    window->identifier = identifier;
+    window->extent = extent;
+    window->render_target = _renderer->allocate_render_target(drawable_extent);
 
     render_ready = true;
 }
@@ -425,8 +427,8 @@ void Engine::add_window(void* native_handle, const int identifier, const prism::
 void Engine::remove_window(const int identifier) {
     Expects(identifier >= 0);
 
-    utility::erase_if(_windows, [identifier](Window& w) {
-        return w.identifier == identifier;
+    utility::erase_if(_windows, [identifier](std::unique_ptr<Window>& w) {
+        return w->identifier == identifier;
     });
 }
 
@@ -658,6 +660,10 @@ void Engine::begin_frame(const float delta_time) {
         _app->begin_frame();
 }
 
+void Engine::end_frame() {
+    ImGui::UpdatePlatformWindows();
+}
+
 int frame_delay = 0;
 const int frame_delay_between_resolution_change = 60;
 

engine/core/src/imguilayer.cpp

@@ -41,8 +41,8 @@ ImGuiLayer::ImGuiLayer() {
     io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;
     io.BackendPlatformName = "Prism";
     
-    //if(platform::supports_feature(PlatformFeature::Windowing))
-    //    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
+    if(platform::supports_feature(PlatformFeature::Windowing))
+        io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
     
     for (auto& [im, pl] : imToPl)
         io.KeyMap[im] = platform::get_keycode(pl);
@@ -196,8 +196,6 @@ void ImGuiLayer::render(int index) {
     if(index == 0) {
         ImGui::EndFrame();
         ImGui::Render();
-        
-        ImGui::UpdatePlatformWindows();
     }
 }
 

engine/renderer/src/imguipass.cpp

@@ -75,9 +75,11 @@ void ImGuiPass::render_post(GFXCommandBuffer* command_buffer, const int index) {
     } else {
         auto& io = ImGui::GetPlatformIO();
         for(int i = 1; i < io.Viewports.size(); i++) {
-            if((io.Viewports[i]->Flags & ImGuiViewportFlags_Minimized) == 0)
-                if(*(int*)io.Viewports[i]->PlatformHandle == index)
+            if((io.Viewports[i]->Flags & ImGuiViewportFlags_Minimized) == 0) {
+                auto platform_handle = (int*)io.Viewports[i]->PlatformHandle;
+                if(platform_handle != nullptr && *platform_handle == index)
                     draw_data = io.Viewports[i]->DrawData;
+            }
         }
     }
     

platforms/mac/main.mm.in

@@ -616,6 +616,8 @@ int main(int argc, char* argv[]) {
                     [window->delegate render];
             }
 
+            engine->end_frame();
+            
             scrollX = 0.0f;
             scrollY = 0.0f;