added onrender function to use sdl render in client, enabled multiviewports in imgui

SakuraCore/src/Application.cpp

@@ -3,6 +3,7 @@
 #include "Layer.h"
 #include "Log.h"
 #include "SDL3/SDL_events.h"
+#include "SDL3/SDL_hints.h"
 #include "SDL3/SDL_main.h"
 #include "SDL3/SDL_render.h"
 #include "SDL3/SDL_stdinc.h"
@@ -136,6 +137,11 @@ void Application::Run() {
         }
 
         // Rendering
+
+        for (auto &layer : m_LayerStack) {
+            layer->OnRender();
+        }
+
         m_ImGui->Begin();
 
         SDL_SetRenderScale(m_Renderer, io.DisplayFramebufferScale.x, io.DisplayFramebufferScale.y);
@@ -148,6 +154,11 @@ void Application::Run() {
 
         m_ImGui->End();
 
+        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) {
+            ImGui::UpdatePlatformWindows();
+            ImGui::RenderPlatformWindowsDefault();
+        }
+
         SDL_RenderPresent(m_Renderer);
     }
 }

SakuraCore/src/Layer.h

@@ -17,6 +17,7 @@ public:
     virtual void OnAttach() {}
     virtual void OnDetach() {}
     virtual void OnImGuiRender() {}
+    virtual void OnRender() {}
     virtual void Suspend() { m_isActive = false; }
     virtual void Activate() { m_isActive = true; }
 

SakuraCore/src/imguiinit.cpp

@@ -17,6 +17,7 @@ void ImGuiInit::Init() {
     ImGuiIO &io = ImGui::GetIO();
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
     io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
 
     ImGui::StyleColorsDark();