ADDED: IsWindowFocused()

src/core.c

@@ -352,6 +352,7 @@ typedef struct CoreData {
         const char *title;                  // Window text title const pointer
         bool ready;                         // Flag to check if window has been initialized successfully
         bool minimized;                     // Flag to check if window has been minimized
+        bool focused;                       // Flag to check if window has been focused
         bool resized;                       // Flag to check if window has been resized
         bool fullscreen;                    // Flag to check if fullscreen mode required
         bool alwaysRun;                     // Flag to keep window update/draw running on minimized
@@ -498,6 +499,7 @@ static void ScrollCallback(GLFWwindow *window, double xoffset, double yoffset);
 static void CursorEnterCallback(GLFWwindow *window, int enter);                            // GLFW3 Cursor Enter Callback, cursor enters client area
 static void WindowSizeCallback(GLFWwindow *window, int width, int height);                 // GLFW3 WindowSize Callback, runs when window is resized
 static void WindowIconifyCallback(GLFWwindow *window, int iconified);                      // GLFW3 WindowIconify Callback, runs when window is minimized/restored
+static void WindowFocusCallback(GLFWwindow *window, int focused);                          // GLFW3 WindowFocus Callback, runs when window get/lose focus
 static void WindowDropCallback(GLFWwindow *window, int count, const char **paths);         // GLFW3 Window Drop Callback, runs when drop files into window
 #endif
 
@@ -842,7 +844,7 @@ bool WindowShouldClose(void)
 #endif
 }
 
-// Check if window has been minimized (or lost focus)
+// Check if window has been minimized
 bool IsWindowMinimized(void)
 {
 #if defined(PLATFORM_DESKTOP) || defined(PLATFORM_WEB) || defined(PLATFORM_UWP)
@@ -852,6 +854,16 @@ bool IsWindowMinimized(void)
 #endif
 }
 
+// Check if window has the focus
+bool IsWindowFocused(void)
+{
+#if defined(PLATFORM_DESKTOP) || defined(PLATFORM_WEB) || defined(PLATFORM_UWP)
+    return CORE.Window.focused;
+#else
+    return false;
+#endif
+}
+
 // Check if window has been resized
 bool IsWindowResized(void)
 {
@@ -2934,6 +2946,7 @@ static bool InitGraphicsDevice(int width, int height)
     glfwSetCharCallback(CORE.Window.handle, CharCallback);
     glfwSetScrollCallback(CORE.Window.handle, ScrollCallback);
     glfwSetWindowIconifyCallback(CORE.Window.handle, WindowIconifyCallback);
+    glfwSetWindowFocusCallback(CORE.Window.handle, WindowFocusCallback);
     glfwSetDropCallback(CORE.Window.handle, WindowDropCallback);
 
     glfwMakeContextCurrent(CORE.Window.handle);
@@ -4125,6 +4138,13 @@ static void WindowIconifyCallback(GLFWwindow *window, int iconified)
     else CORE.Window.minimized = false;           // The window was restored
 }
 
+// GLFW3 WindowFocus Callback, runs when window get/lose focus
+static void WindowFocusCallback(GLFWwindow *window, int focused)
+{
+    if (focused) CORE.Window.focused = true;    // The window was focused
+    else CORE.Window.focused = false;           // The window lost focus
+}
+
 // GLFW3 Window Drop Callback, runs when drop files into window
 // NOTE: Paths are stored in dynamic memory for further retrieval
 // Everytime new files are dropped, old ones are discarded

src/raylib.h

@@ -873,7 +873,8 @@ RLAPI void InitWindow(int width, int height, const char *title);  // Initialize
 RLAPI bool WindowShouldClose(void);                               // Check if KEY_ESCAPE pressed or Close icon pressed
 RLAPI void CloseWindow(void);                                     // Close window and unload OpenGL context
 RLAPI bool IsWindowReady(void);                                   // Check if window has been initialized successfully
-RLAPI bool IsWindowMinimized(void);                               // Check if window has been minimized (or lost focus)
+RLAPI bool IsWindowMinimized(void);                               // Check if window has been minimized
+RLAPI bool IsWindowFocused(void);                                 // Check if window has been focused
 RLAPI bool IsWindowResized(void);                                 // Check if window has been resized
 RLAPI bool IsWindowHidden(void);                                  // Check if window is currently hidden
 RLAPI bool IsWindowFullscreen(void);                              // Check if window is currently fullscreen