diff --git a/src/core.c b/src/core.c
index 1051355d3..27148f995 100644
--- a/src/core.c
+++ b/src/core.c
@@ -387,6 +387,7 @@ typedef struct CoreData {
         char **dropFilesPath;               // Store dropped files paths as strings
         int dropFilesCount;                 // Count dropped files strings
 
+        windowReSizeDrawCallB resizeDrawCallB;
     } Window;
 #if defined(PLATFORM_ANDROID)
     struct {
@@ -591,7 +592,7 @@ extern void UnloadFontDefault(void);        // [Module: text] Unloads default fo
 static void InitTimer(void);                            // Initialize timer (hi-resolution if available)
 static bool InitGraphicsDevice(int width, int height);  // Initialize graphics device
 static void SetupFramebuffer(int width, int height);    // Setup main framebuffer
-static void SetupViewport(int width, int height);       // Set viewport for a provided width and height
+void SetupViewport(int width, int height);       // Set viewport for a provided width and height
 
 #if defined(PLATFORM_DESKTOP) || defined(PLATFORM_WEB)
 static void ErrorCallback(int error, const char *description);                             // GLFW3 Error Callback, runs on GLFW3 error
@@ -697,6 +698,8 @@ void InitWindow(int width, int height, const char *title)
     CORE.Input.Mouse.cursor = MOUSE_CURSOR_ARROW;
     CORE.Input.Gamepad.lastButtonPressed = -1;
 
+    CORE.Window.resizeDrawCallB = NULL;
+
 #if defined(PLATFORM_ANDROID)
     CORE.Window.screen.width = width;
     CORE.Window.screen.height = height;
@@ -4835,6 +4838,13 @@ static void WindowSizeCallback(GLFWwindow *window, int width, int height)
     CORE.Window.screen.height = height;
     // NOTE: Postprocessing texture is not scaled to new size
 
+    if (CORE.Window.resizeDrawCallB != NULL) {
+        CORE.Window.resizeDrawCallB();
+    }
+}
+
+void SetWindowResizeDrawCallback(windowReSizeDrawCallB func) {
+    CORE.Window.resizeDrawCallB = func;
 }
 
 // GLFW3 WindowIconify Callback, runs when window is minimized/restored
diff --git a/src/raylib.h b/src/raylib.h
index 38af9f0eb..5d492fdb3 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -493,6 +493,8 @@ typedef enum {
     FLAG_INTERLACED_HINT    = 0x00010000    // Set to try enabling interlaced video format (for V3D)
 } ConfigFlags;
 
+typedef void(*windowReSizeDrawCallB)(void);
+
 // Trace log level
 // NOTE: Organized by priority level
 typedef enum {
@@ -934,6 +936,8 @@ RLAPI Vector2 GetWindowScaleDPI(void);                            // Get window
 RLAPI const char *GetMonitorName(int monitor);                    // Get the human-readable, UTF-8 encoded name of the primary monitor
 RLAPI void SetClipboardText(const char *text);                    // Set clipboard text content
 RLAPI const char *GetClipboardText(void);                         // Get clipboard text content
+RLAPI void SetupViewport(int width, int height);
+RLAPI void SetWindowResizeDrawCallback(windowReSizeDrawCallB func)
 
 // Custom frame control functions
 // NOTE: Those functions are intended for advance users that want full control over the frame processing