basic imgui integration

main.cpp

@@ -1,5 +1,9 @@
 #include <memory>
 
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+
 #include "peripherals_glfw.h"
 #include "demo/demo_engine.h"
 #include "timer.h"
@@ -208,8 +212,49 @@ int main() {
 
     glBindFramebuffer(GL_FRAMEBUFFER, 0);
 
+
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO(); (void)io;
+    ImGui::StyleColorsDark();
+
+    // Setup Platform/Renderer backends
+    ImGui_ImplGlfw_InitForOpenGL(((peripherals_glfw*)&peripherals)->get_window(), true);
+    ImGui_ImplOpenGL3_Init("#version 150");
+
     timer timer1;
+    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+    bool show_demo_window = false;
+    bool show_another_window = false;
+
     while (!peripherals.should_close() && timer1.seconds_since_start() < DEMO_LENGTH_IN_SECONDS) {
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+
+        {
+            static float f = 0.0f;
+            static int counter = 0;
+
+            ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.
+
+            ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
+            ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
+            ImGui::Checkbox("Another Window", &show_another_window);
+
+            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
+            ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
+
+            if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
+                counter++;
+            ImGui::SameLine();
+            ImGui::Text("counter = %d", counter);
+
+            ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+            ImGui::End();
+        }
+
+
         double elapsedSeconds = timer1.seconds_since_start();
         bigSphere->mesh_ = mesh_generator::extrude(mesh_generator::sphere(50, 50), {200, 201, 100, 101, 400, 401}, 0.05,
                                                    (int) ((sin(elapsedSeconds) + 0.5) * 40));
@@ -231,6 +276,9 @@ int main() {
         demoPartClear.process(demoPartClear.normalizeTime(elapsedSeconds));
         demoPartScene.process(demoPartScene.normalizeTime(elapsedSeconds));
 
+        ImGui::Render();
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
         peripherals.swap_buffers();
         peripherals.poll_events();
     }