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/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);
     }