Examples: Apple: Tweak code and sync with other examples better (untested).

examples/apple_example/imguiex-ios/GameViewController.m

@@ -294,6 +294,13 @@ GLfloat gCubeVertexData[216] =
 
 - (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
 {
+	// Start the dear imgui frame
+    [self.imgui newFrame];
+    
+    // Create some UI elements
+    DebugHUD_DoInterface( &_hud );
+
+	// Render
     glClearColor(0.65f, 0.65f, 0.65f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
@@ -301,28 +308,19 @@ GLfloat gCubeVertexData[216] =
     
     // Render the object with GLKit
     [self.effect prepareToDraw];
-    
     glDrawArrays(GL_TRIANGLES, 0, 36);
     
     // Render the object again with ES2
     glUseProgram(_program);
-    
     glUniformMatrix4fv(uniforms[UNIFORM_MODELVIEWPROJECTION_MATRIX], 1, 0, _modelViewProjectionMatrix.m);
     glUniformMatrix3fv(uniforms[UNIFORM_NORMAL_MATRIX], 1, 0, _normalMatrix.m);
     glUniform3f(uniforms[UNIFORM_DIFFUSE_COLOR], _hud.cubeColor1[0], _hud.cubeColor1[1], _hud.cubeColor1[2] );
-
     glDrawArrays(GL_TRIANGLES, 0, 36);
         
-    [self.imgui newFrame];
-    
-    // Now do our ImGUI UI
-    DebugHUD_DoInterface( &_hud );
-    
     self.effect.light0.diffuseColor = GLKVector4Make( _hud.cubeColor2[0], _hud.cubeColor2[1], _hud.cubeColor2[2], 1.0f);
     
-    // Now render Imgui
+    // Render dear imgui as the last thing in the frame if possible
     [self.imgui render];
-    
 }
 
 #pragma mark -  OpenGL ES 2 shader compilation

examples/apple_example/imguiex-ios/debug_hud.cpp

@@ -10,7 +10,7 @@
 void DebugHUD_InitDefaults( DebugHUD *hud )
 {
     hud->show_demo_window = true;
-    hud->show_example_window = true;
+    hud->show_another_window = true;
     hud->rotation_speed = 15.0f;
     
     hud->cubeColor1[0] = 0.4f;
@@ -26,19 +26,43 @@ void DebugHUD_InitDefaults( DebugHUD *hud )
 
 void DebugHUD_DoInterface(DebugHUD *hud)
 {
+    // 1. Show a simple window.
+    // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
+    {
+        static float f = 0.0f;
+        static int counter = 0;
+        ImGui::Text("Hello, world!");                           // Display some text (you can use a format string too)
+        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
+
+        ImGui::Checkbox("Demo Window", &hud->show_demo_window);      // Edit bools storing our windows open/close state
+        ImGui::Checkbox("Another Window", &hud->show_another_window);
+
+        if (ImGui::Button("Button"))                            // Buttons return true when clicked (NB: 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);
+    }
+
+    // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows.
+    if (hud->show_another_window)
+    {
+        ImGui::Begin("Another Window", &hud-?show_another_window);
+        ImGui::Text("Hello from another window!");
+        ImGui::ColorEdit3("Cube 1 Color", hud->cubeColor1);
+        ImGui::ColorEdit3("Cube 2 Color", hud->cubeColor2);
+        ImGui::SliderFloat("Rotation Speed", &hud->rotation_speed, 0.0f, 200.0f);
+        if (ImGui::Button("Close Me"))
+            hud->show_another_window = false;
+        ImGui::End();
+    }
+
+    // 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui!
     if (hud->show_demo_window)
     {
         ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver); // Normally user code doesn't need/want to call this because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
         ImGui::ShowDemoWindow(&hud->show_demo_window);
     }
-    
-    if (hud->show_example_window)
-    {
-        ImGui::Begin("Another Window", &hud->show_example_window);
-        ImGui::Text("Hello from another window!");
-        ImGui::ColorEdit3("Cube 1 Color", hud->cubeColor1);
-        ImGui::ColorEdit3("Cube 2 Color", hud->cubeColor2);
-        ImGui::SliderFloat("Rotation Speed", &hud->rotation_speed, 0.0f, 200.0f);
-        ImGui::End();
-    }
 }

examples/apple_example/imguiex-ios/debug_hud.h

@@ -7,7 +7,7 @@
 typedef struct DebugHUD
 {
     bool show_demo_window;
-    bool show_example_window;
+    bool show_another_window;
     float rotation_speed;
     float cubeColor1[4];
     float cubeColor2[4];