diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp
index bf47a7a19..7afbf3435 100644
--- a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp
+++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp
@@ -15,7 +15,6 @@
 #include <GL/gl3w.h>
 
 // Data
-static SDL_Window*  g_Window = NULL;
 static double       g_Time = 0.0f;
 static bool         g_MousePressed[3] = { false, false, false };
 static float        g_MouseWheel = 0.0f;
@@ -296,10 +295,8 @@ void    ImGui_ImplSdlGL3_InvalidateDeviceObjects()
     }
 }
 
-bool    ImGui_ImplSdlGL3_Init(SDL_Window *window)
+bool    ImGui_ImplSdlGL3_Init(SDL_Window* window)
 {
-    g_Window = window;
-    
     ImGuiIO& io = ImGui::GetIO();
     io.KeyMap[ImGuiKey_Tab] = SDLK_TAB;                     // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
     io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT;
@@ -341,7 +338,7 @@ void ImGui_ImplSdlGL3_Shutdown()
     ImGui::Shutdown();
 }
 
-void ImGui_ImplSdlGL3_NewFrame()
+void ImGui_ImplSdlGL3_NewFrame(SDL_Window* window)
 {
     if (!g_FontTexture)
         ImGui_ImplSdlGL3_CreateDeviceObjects();
@@ -350,9 +347,11 @@ void ImGui_ImplSdlGL3_NewFrame()
 
     // Setup display size (every frame to accommodate for window resizing)
     int w, h;
-    SDL_GetWindowSize(g_Window, &w, &h);
+    int display_w, display_h;
+    SDL_GetWindowSize(window, &w, &h);
+    SDL_GL_GetDrawableSize(window, &display_w, &display_h);
     io.DisplaySize = ImVec2((float)w, (float)h);
-    io.DisplayFramebufferScale = ImVec2(1.0f, 1.0f);
+    io.DisplayFramebufferScale = ImVec2(w > 0 ? ((float)display_w / w) : 0, h > 0 ? ((float)display_h / h) : 0);
 
     // Setup time step
     Uint32	time = SDL_GetTicks();
@@ -364,7 +363,7 @@ void ImGui_ImplSdlGL3_NewFrame()
     // (we already got mouse wheel, keyboard keys & characters from SDL_PollEvent())
     int mx, my;
     Uint32 mouseMask = SDL_GetMouseState(&mx, &my);
-    if (SDL_GetWindowFlags(g_Window) & SDL_WINDOW_MOUSE_FOCUS)
+    if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS)
         io.MousePos = ImVec2((float)mx, (float)my);   // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
     else
         io.MousePos = ImVec2(-1, -1);
diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h
index 6205284a0..99abd4094 100644
--- a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h
+++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h
@@ -9,9 +9,9 @@
 struct SDL_Window;
 typedef union SDL_Event SDL_Event;
 
-IMGUI_API bool        ImGui_ImplSdlGL3_Init(SDL_Window *window);
+IMGUI_API bool        ImGui_ImplSdlGL3_Init(SDL_Window* window);
 IMGUI_API void        ImGui_ImplSdlGL3_Shutdown();
-IMGUI_API void        ImGui_ImplSdlGL3_NewFrame();
+IMGUI_API void        ImGui_ImplSdlGL3_NewFrame(SDL_Window* window);
 IMGUI_API bool        ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event);
 
 // Use if you want to reset your rendering device without losing ImGui state.
diff --git a/examples/sdl_opengl3_example/main.cpp b/examples/sdl_opengl3_example/main.cpp
index 54d2749a6..33b4903f9 100644
--- a/examples/sdl_opengl3_example/main.cpp
+++ b/examples/sdl_opengl3_example/main.cpp
@@ -58,7 +58,7 @@ int main(int, char**)
             if (event.type == SDL_QUIT)
                 done = true;
         }
-        ImGui_ImplSdlGL3_NewFrame();
+        ImGui_ImplSdlGL3_NewFrame(window);
 
         // 1. Show a simple window
         // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
diff --git a/examples/sdl_opengl_example/imgui_impl_sdl.cpp b/examples/sdl_opengl_example/imgui_impl_sdl.cpp
index 8359fd8a5..927f87749 100644
--- a/examples/sdl_opengl_example/imgui_impl_sdl.cpp
+++ b/examples/sdl_opengl_example/imgui_impl_sdl.cpp
@@ -185,7 +185,7 @@ void    ImGui_ImplSdl_InvalidateDeviceObjects()
     }
 }
 
-bool    ImGui_ImplSdl_Init(SDL_Window *window)
+bool    ImGui_ImplSdl_Init(SDL_Window* window)
 {
     ImGuiIO& io = ImGui::GetIO();
     io.KeyMap[ImGuiKey_Tab] = SDLK_TAB;                     // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
@@ -237,8 +237,11 @@ void ImGui_ImplSdl_NewFrame(SDL_Window *window)
 
     // Setup display size (every frame to accommodate for window resizing)
     int w, h;
+    int display_w, display_h;
     SDL_GetWindowSize(window, &w, &h);
+    SDL_GL_GetDrawableSize(window, &display_w, &display_h);
     io.DisplaySize = ImVec2((float)w, (float)h);
+    io.DisplayFramebufferScale = ImVec2(w > 0 ? ((float)display_w / w) : 0, h > 0 ? ((float)display_h / h) : 0);
 
     // Setup time step
     Uint32	time = SDL_GetTicks();
diff --git a/examples/sdl_opengl_example/imgui_impl_sdl.h b/examples/sdl_opengl_example/imgui_impl_sdl.h
index e298365d2..a322bf2d9 100644
--- a/examples/sdl_opengl_example/imgui_impl_sdl.h
+++ b/examples/sdl_opengl_example/imgui_impl_sdl.h
@@ -9,9 +9,9 @@
 struct SDL_Window;
 typedef union SDL_Event SDL_Event;
 
-IMGUI_API bool        ImGui_ImplSdl_Init(SDL_Window *window);
+IMGUI_API bool        ImGui_ImplSdl_Init(SDL_Window* window);
 IMGUI_API void        ImGui_ImplSdl_Shutdown();
-IMGUI_API void        ImGui_ImplSdl_NewFrame(SDL_Window *window);
+IMGUI_API void        ImGui_ImplSdl_NewFrame(SDL_Window* window);
 IMGUI_API bool        ImGui_ImplSdl_ProcessEvent(SDL_Event* event);
 
 // Use if you want to reset your rendering device without losing ImGui state.