ImGUI input handling now works.

src/flamegpu/visualiser/Visualiser.cpp

@@ -371,6 +371,12 @@ void Visualiser::render() {
     this->lighting->getPointLight(0).Position(this->camera->getEye());
     //  handle each event on the queue
     while (SDL_PollEvent(&e) != 0) {
+        if (!SDL_GetRelativeMouseMode()) {
+            // Assume ImGUI is top level, allow it first chance on IO if mouse isn't locked for movement
+            ImGui_ImplSDL2_ProcessEvent(&e);
+            if (ImGui::GetIO().WantCaptureMouse || ImGui::GetIO().WantCaptureKeyboard)
+                continue;
+        }
         switch (e.type) {
         case SDL_QUIT:
             continueRender = false;

src/flamegpu/visualiser/ui/ImGuiPanel.cpp

@@ -13,20 +13,19 @@ namespace visualiser {
 
 ImGuiPanel::ImGuiPanel()
     : Overlay(std::make_shared<Shaders>(Stock::Shaders::SPRITE2D)) {
-    bool is_true = true;
-
     // Start the Dear ImGui frame
     ImGui_ImplOpenGL3_NewFrame();
-    ImGui_ImplSDL2_NewFrame();
-    ImGui::NewFrame();
-    ImGui::ShowDemoWindow(&is_true);
-    // This renders the interface to a host texture
-    ImGui::Render();
+    ImGui_ImplSDL2_NewFrame();  // This can't be called in the render thread, as it tries to grab the window dimensions via SDL
 }
 void ImGuiPanel::reload() {
   // Do nothing
 }
 void ImGuiPanel::render(const glm::mat4*, const glm::mat4*, GLuint fbo) {
+    ImGui::NewFrame();
+    bool is_true = true;
+    ImGui::ShowDemoWindow(&is_true);
+    // This renders the interface to a host texture
+    ImGui::Render();
     // glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
     // glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
     // glClear(GL_COLOR_BUFFER_BIT);