OpenGL/DirextX examples: comments and tweaks.

examples/directx9_example/main.cpp

@@ -168,12 +168,10 @@ LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
             io.AddInputCharacter((unsigned short)wParam);
         return true;
     case WM_DESTROY:
-        {
         Cleanup();
         PostQuitMessage(0);
         return 0;
     }
-    }
     return DefWindowProc(hWnd, msg, wParam, lParam);
 }
 
@@ -310,10 +308,12 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
         
         UpdateImGui();
 
-        // Create a simple window
-        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
         static bool show_test_window = true;
         static bool show_another_window = false;
+
+        // 1. Show a simple window
+        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
+        {
             static float f;
             ImGui::Text("Hello, world!");
             ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
@@ -330,16 +330,9 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
             ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
             const float ms_per_frame_avg = ms_per_frame_accum / 120;
             ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
-
-        // Show the ImGui test window
-        // Most of user example code is in ImGui::ShowTestWindow()
-        if (show_test_window)
-        {
-            ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));     // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
-            ImGui::ShowTestWindow(&show_test_window);
         }
 
-        // Show another simple window
+        // 2. Show another simple window, this time using an explicit Begin/End pair
         if (show_another_window)
         {
             ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
@@ -347,6 +340,13 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
             ImGui::End();
         }
 
+        // 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowTestWindow()
+        if (show_test_window)
+        {
+            ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));     // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
+            ImGui::ShowTestWindow(&show_test_window);
+        }
+
         // Rendering
         g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
         g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false);

examples/opengl_example/main.cpp

@@ -252,7 +252,7 @@ void UpdateImGui()
     double mouse_x, mouse_y;
     glfwGetCursorPos(window, &mouse_x, &mouse_y);
     io.MousePos = ImVec2((float)mouse_x * mousePosScale.x, (float)mouse_y * mousePosScale.y);      // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
-    io.MouseDown[0] = mousePressed[0] || glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) != 0;  // If a mouse press event came, always pass it, so we don't miss click-release events that are shorted than our frame.
+    io.MouseDown[0] = mousePressed[0] || glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) != 0;  // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
     io.MouseDown[1] = mousePressed[1] || glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_RIGHT) != 0;
 
     // Start the frame
@@ -273,10 +273,12 @@ int main(int argc, char** argv)
         glfwPollEvents();
         UpdateImGui();
 
-        // Create a simple window
-        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
         static bool show_test_window = true;
         static bool show_another_window = false;
+
+        // 1. Show a simple window
+        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
+        {
             static float f;
             ImGui::Text("Hello, world!");
             ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
@@ -293,16 +295,9 @@ int main(int argc, char** argv)
             ms_per_frame_idx = (ms_per_frame_idx + 1) % 120;
             const float ms_per_frame_avg = ms_per_frame_accum / 120;
             ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
-
-        // Show the ImGui test window
-        // Most of user example code is in ImGui::ShowTestWindow()
-        if (show_test_window)
-        {
-            ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));        // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
-            ImGui::ShowTestWindow(&show_test_window);
         }
 
-        // Show another simple window
+        // 2. Show another simple window, this time using an explicit Begin/End pair
         if (show_another_window)
         {
             ImGui::Begin("Another Window", &show_another_window, ImVec2(200,100));
@@ -310,6 +305,13 @@ int main(int argc, char** argv)
             ImGui::End();
         }
 
+        // 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowTestWindow()
+        if (show_test_window)
+        {
+            ImGui::SetNewWindowDefaultPos(ImVec2(650, 20));        // Normally user code doesn't need/want to call this, because positions are saved in .ini file. Here we just want to make the demo initial state a bit more friendly!
+            ImGui::ShowTestWindow(&show_test_window);
+        }
+
         // Rendering
         glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
         glClearColor(0.8f, 0.6f, 0.6f, 1.0f);