added imgui

TSE_GlfwOpenGlImpl/src/OpenGLRenderingBackend.cpp

@@ -4,6 +4,10 @@
 #include "GL/gl.h"
 #include "WindowGlfw.hpp"
 #include "Debug.hpp"
+#include "imgui/imgui.h"
+#include "extern/imgui_impl_glfw.h"
+#include "extern/imgui_impl_opengl3.h"
+#include "PathHelper.hpp"
 
 TSE::GLFW::OpenGLRenderingBackend::OpenGLRenderingBackend(Color _backgroundColor, bool _vsync)
 : OpenGLRenderingBackend(_backgroundColor, _vsync, 0, false){ }
@@ -16,6 +20,16 @@ TSE::GLFW::OpenGLRenderingBackend::OpenGLRenderingBackend(Color _backgroundColor
     useseImGui = _useseImGui;
 }
 
+TSE::GLFW::OpenGLRenderingBackend::~OpenGLRenderingBackend()
+{
+    if(useseImGui)
+    {
+        ImGui_ImplOpenGL3_Shutdown();
+        ImGui_ImplGlfw_Shutdown();
+        ImGui::DestroyContext();
+    }
+}
+
 void TSE::GLFW::OpenGLRenderingBackend::InitPreWindow()
 {
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, TSE_OPENGL_VERSION_MAJOR);
@@ -62,6 +76,29 @@ bool TSE::GLFW::OpenGLRenderingBackend::InitPostWindow()
     return true;
 }
 
+bool TSE::GLFW::OpenGLRenderingBackend::InitEnd()
+{
+    if(useseImGui)
+    {
+        string imguiIniPath;
+        GetAppDataPath(imguiIniPath);
+        imguiIniPath += "/UI.cfg";
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+        ImGuiIO& io = ImGui::GetIO(); (void)io;
+        io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+        io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+        io.IniFilename = imguiIniPath.c_str();
+        ImGui::StyleColorsDark();
+
+        WindowGlfw* wnd = static_cast<WindowGlfw*>(window);
+        ImGui_ImplGlfw_InitForOpenGL(wnd->window, true);
+        ImGui_ImplOpenGL3_Init("#version 130");
+        
+        Debug::Log("ImGui:" + std::string(ImGui::GetVersion()));
+    }
+}
+
 void TSE::GLFW::OpenGLRenderingBackend::onResize(int width, int height)
 {
     glViewport(0,0,width, height);
@@ -75,6 +112,22 @@ void TSE::GLFW::OpenGLRenderingBackend::onUpdate() const
         Debug::Log("OpenGL Error: " + std::to_string(error));
     }
 
+    if(useseImGui)
+    {
+        ImGui::Render();
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        
+        if(ImGui::GetIO().ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        {
+            GLFWwindow* backup_current_context = glfwGetCurrentContext();
+            ImGui::UpdatePlatformWindows();
+            ImGui::RenderPlatformWindowsDefault();
+            glfwMakeContextCurrent(backup_current_context);
+        }
+
+    }
+
     WindowGlfw* wnd = static_cast<WindowGlfw*>(window);
     glfwSwapBuffers(wnd->window);
 }
@@ -84,6 +137,12 @@ void TSE::GLFW::OpenGLRenderingBackend::onClear() const
     //cameras
 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    if(useseImGui)
+    {
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+    }
 }
 
 void TSE::GLFW::OpenGLRenderingBackend::onClearDepthBuffer() const