Examples, Platform: Removed the call to ImGui::NewFrame() from the platform _NewFrame() function e.g. ImGui_ImplWin32_NewFrame(), ImGui_ImplSDL2_NewFrame(), ImGui_ImplGlfw_NewFrame(), etc. Moved to main.cpp for consistency. (#1542)

examples/allegro5_example/main.cpp

@@ -56,6 +56,7 @@ int main(int, char**)
     bool running = true;
     while (running)
     {
+        // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -73,7 +74,10 @@ int main(int, char**)
                 ImGui_ImplAllegro5_CreateDeviceObjects();
             }
         }
+
+        // Start the ImGui frame
         ImGui_ImplAllegro5_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
@@ -113,8 +117,8 @@ int main(int, char**)
         }
 
         // Rendering
-        al_clear_to_color(al_map_rgba_f(clear_color.x, clear_color.y, clear_color.z, clear_color.w));
         ImGui::Render();
+        al_clear_to_color(al_map_rgba_f(clear_color.x, clear_color.y, clear_color.z, clear_color.w));
         ImGui_ImplAllegro5_RenderDrawData(ImGui::GetDrawData());
         al_flip_display();
     }

examples/directx10_example/main.cpp

@@ -153,6 +153,7 @@ int main(int, char**)
     ZeroMemory(&msg, sizeof(msg));
     while (msg.message != WM_QUIT)
     {
+        // Poll and handle messages (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -163,8 +164,11 @@ int main(int, char**)
             DispatchMessage(&msg);
             continue;
         }
+
+        // Start the ImGui frame
         ImGui_ImplDX10_NewFrame();
         ImGui_ImplWin32_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
@@ -204,9 +208,9 @@ int main(int, char**)
         }
 
         // Rendering
+        ImGui::Render();
         g_pd3dDevice->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
         g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color);
-        ImGui::Render();
         ImGui_ImplDX10_RenderDrawData(ImGui::GetDrawData());
 
         // Update and Render additional Platform Windows

examples/directx11_example/main.cpp

@@ -173,6 +173,7 @@ int main(int, char**)
     ZeroMemory(&msg, sizeof(msg));
     while (msg.message != WM_QUIT)
     {
+        // Poll and handle messages (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -183,8 +184,11 @@ int main(int, char**)
             DispatchMessage(&msg);
             continue;
         }
+
+        // Start the ImGui frame
         ImGui_ImplDX11_NewFrame();
         ImGui_ImplWin32_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
@@ -224,9 +228,9 @@ int main(int, char**)
         }
 
         // Rendering
+        ImGui::Render();
         g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color);
-        ImGui::Render();
         ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
 
         // Update and Render additional Platform Windows

examples/directx12_example/main.cpp

@@ -290,7 +290,7 @@ int main(int, char**)
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
-    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
+    //io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
     ImGui_ImplWin32_Init(hwnd);
@@ -325,6 +325,7 @@ int main(int, char**)
     ZeroMemory(&msg, sizeof(msg));
     while (msg.message != WM_QUIT)
     {
+        // Poll and handle messages (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -335,8 +336,11 @@ int main(int, char**)
             DispatchMessage(&msg);
             continue;
         }
+
+        // Start the ImGui frame
         ImGui_ImplDX12_NewFrame(g_pd3dCommandList);
         ImGui_ImplWin32_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".

examples/directx9_example/main.cpp

@@ -113,6 +113,7 @@ int main(int, char**)
     UpdateWindow(hwnd);
     while (msg.message != WM_QUIT)
     {
+        // Poll and handle messages (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -123,8 +124,11 @@ int main(int, char**)
             DispatchMessage(&msg);
             continue;
         }
+
+        // Start the ImGui frame
         ImGui_ImplDX9_NewFrame();
         ImGui_ImplWin32_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".

examples/imgui_impl_allegro5.cpp

@@ -307,7 +307,4 @@ void ImGui_ImplAllegro5_NewFrame()
         }
         al_set_system_mouse_cursor(g_Display, cursor_id);
     }
-
-    // Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application.
-    ImGui::NewFrame();
 }

examples/imgui_impl_glfw.cpp

@@ -326,9 +326,6 @@ void ImGui_ImplGlfw_NewFrame()
         else
             io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
     }
-
-    // Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application.
-    ImGui::NewFrame();
 }
 
 //--------------------------------------------------------------------------------------------------------

examples/imgui_impl_marmalade.cpp

@@ -289,9 +289,6 @@ void ImGui_Marmalade_NewFrame()
     // TODO: Hide OS mouse cursor if ImGui is drawing it
     // s3ePointerSetInt(S3E_POINTER_HIDE_CURSOR,(io.MouseDrawCursor ? 0 : 1));
 
-    // Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application.
-    ImGui::NewFrame();
-
      // Show/hide OSD keyboard
     if (io.WantTextInput)
     {

examples/imgui_impl_sdl2.cpp

@@ -302,9 +302,6 @@ void ImGui_ImplSDL2_NewFrame(SDL_Window* window)
 
     ImGui_ImplSDL2_UpdateMousePosAndButtons();
     ImGui_ImplSDL2_UpdateMouseCursor();
-
-    // Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application.
-    ImGui::NewFrame();
 }
 
 //--------------------------------------------------------------------------------------------------------

examples/imgui_impl_win32.cpp

@@ -203,9 +203,6 @@ void    ImGui_ImplWin32_NewFrame()
         g_LastMouseCursor = mouse_cursor;
         ImGui_ImplWin32_UpdateMouseCursor();
     }
-
-    // Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application.
-    ImGui::NewFrame();
 }
 
 // Allow compilation with old Windows SDK. MinGW doesn't have default _WIN32_WINNT/WINVER versions.

examples/marmalade_example/main.cpp

@@ -52,13 +52,17 @@ int main(int, char**)
         if (s3eDeviceCheckQuitRequest())
             break;
 
+        // Poll and handle inputs
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
         // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
         s3eKeyboardUpdate();
         s3ePointerUpdate();
+
+        // Start the ImGui frame
         ImGui_Marmalade_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
@@ -98,9 +102,9 @@ int main(int, char**)
         }
 
         // Rendering
+        ImGui::Render();
         IwGxSetColClear(clear_color.x * 255, clear_color.y * 255, clear_color.z * 255, clear_color.w * 255);
         IwGxClear();
-        ImGui::Render();
         ImGui_Marmalade_RenderDrawData(ImGui::GetDrawData());
         IwGxSwapBuffers();
 

examples/opengl2_example/main.cpp

@@ -63,13 +63,17 @@ int main(int, char**)
     // Main loop
     while (!glfwWindowShouldClose(window))
     {
+        // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
         // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
         glfwPollEvents();
+
+        // Start the ImGui frame
         ImGui_ImplOpenGL2_NewFrame();
         ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".

examples/opengl3_example/main.cpp

@@ -72,13 +72,17 @@ int main(int, char**)
     // Main loop
     while (!glfwWindowShouldClose(window))
     {
+        // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
         // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
         glfwPollEvents();
+
+        // Start the ImGui frame
         ImGui_ImplOpenGL3_NewFrame();
         ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".

examples/sdl_opengl2_example/main.cpp

@@ -70,6 +70,7 @@ int main(int, char**)
     bool done = false;
     while (!done)
     {
+        // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -81,8 +82,11 @@ int main(int, char**)
             if (event.type == SDL_QUIT)
                 done = true;
         }
+
+        // Start the ImGui frame
         ImGui_ImplOpenGL2_NewFrame();
         ImGui_ImplSDL2_NewFrame(window);
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
@@ -122,11 +126,11 @@ int main(int, char**)
         }
 
         // Rendering
+        ImGui::Render();
         glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
         glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
         glClear(GL_COLOR_BUFFER_BIT);
         //glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
-        ImGui::Render();
         ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
         SDL_GL_SwapWindow(window);
     }

examples/sdl_opengl3_example/main.cpp

@@ -72,6 +72,7 @@ int main(int, char**)
     bool done = false;
     while (!done)
     {
+        // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -85,8 +86,11 @@ int main(int, char**)
             if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
                 done = true;
         }
+
+        // Start the ImGui frame
         ImGui_ImplOpenGL3_NewFrame();
         ImGui_ImplSDL2_NewFrame(window);
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".

examples/sdl_vulkan_example/main.cpp

@@ -411,6 +411,7 @@ int main(int, char**)
     bool done = false;
     while (!done)
     {
+        // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
@@ -424,8 +425,11 @@ int main(int, char**)
             if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_RESIZED && event.window.windowID == SDL_GetWindowID(window)) 
                 ImGui_ImplVulkanH_CreateWindowDataSwapChainAndFramebuffer(g_PhysicalDevice, g_Device, &g_WindowData, g_Allocator, (int)event.window.data1, (int)event.window.data2);
         }
+
+        // Start the ImGui frame
         ImGui_ImplVulkan_NewFrame();
         ImGui_ImplSDL2_NewFrame(window);
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".

examples/vulkan_example/main.cpp

@@ -423,20 +423,22 @@ int main(int, char**)
     // Main loop
     while (!glfwWindowShouldClose(window))
     {
+        // Poll and handle events (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
         // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
         glfwPollEvents();
-
 		if (g_ResizeWanted)
 		{
 			ImGui_ImplVulkanH_CreateWindowDataSwapChainAndFramebuffer(g_PhysicalDevice, g_Device, &g_WindowData, g_Allocator, g_ResizeWidth, g_ResizeHeight);
 			g_ResizeWanted = false;
 		}
 
+        // Start the ImGui frame
         ImGui_ImplVulkan_NewFrame();
         ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
 
         // 1. Show a simple window.
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".

imgui.cpp

@@ -264,6 +264,8 @@
  You can read releases logs https://github.com/ocornut/imgui/releases for more details.
 
  (Viewport Branch)
+ - 2018/XX/XX (1.XX) - examples: the examples imgui_impl_xxx files have been split to separate platform (Win32, Glfw, SDL2, etc.) from renderer (DX11, OpenGL, Vulkan,  etc.)
+                       when adopting new bindings follow the code in examples/ to know which functions to call.
  - 2018/XX/XX (1.XX) - when multi-viewports are enabled, all positions will be in your natural OS coordinates space. It means that:
                         - reference to hard-coded positions such as in SetNextWindowPos(ImVec2(0,0)) are probably not what you want anymore. 
                           you may use GetMainViewport()->Pos to offset hard-coded positions, e.g. SetNextWindowPos(GetMainViewport()->Pos)