Add flag: SUPPORT_EVENTS_WAITING

Wait for input events passively (sleep) instead of polling events actively every frame

4 files changed, 12 insertions, 1 deletions

diff --git a/src/CMakeOptions.txt b/src/CMakeOptions.txt
index eee3f1a9..ee63c5b4 100644
--- a/src/CMakeOptions.txt
+++ b/src/CMakeOptions.txt
@@ -24,6 +24,7 @@ set(OFF ${INCLUDE_EVERYTHING} CACHE INTERNAL "Replace any OFF by default with \$
 
 # core.c
 option(SUPPORT_BUSY_WAIT_LOOP "Use busy wait loop for timing sync instead of a high-resolution timer" ON)
+option(SUPPORT_EVENTS_WAITING "Wait for events passively (sleeping while no events) instead of polling them actively every frame" OFF)
 option(SUPPORT_CAMERA_SYSTEM "Provide camera module (camera.h) with multiple predefined cameras: free, 1st/3rd person, orbital" ON)
 option(SUPPORT_DEFAULT_FONT "Default font is loaded on window initialization to be available for the user to render simple text. If enabled, uses external module functions to load default raylib font (module: text)" ON)
 option(SUPPORT_SCREEN_CAPTURE "Allow automatic screen capture of current screen pressing F12, defined in KeyCallback()" ON)
diff --git a/src/config.h b/src/config.h
index 47cc8068..7992f5b3 100644
--- a/src/config.h
+++ b/src/config.h
@@ -44,6 +44,8 @@
 #define SUPPORT_MOUSE_GESTURES      1
 // Use busy wait loop for timing sync, if not defined, a high-resolution timer is setup and used
 #define SUPPORT_BUSY_WAIT_LOOP      1
+// Wait for events passively (sleeping while no events) instead of polling them actively every frame
+//SUPPORT_EVENTS_WAITING            1
 // Allow automatic screen capture of current screen pressing F12, defined in KeyCallback()
 #define SUPPORT_SCREEN_CAPTURE      1
 // Allow automatic gif recording of current screen pressing CTRL+F12, defined in KeyCallback()
diff --git a/src/config.h.in b/src/config.h.in
index b0e62480..928405cd 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -9,6 +9,8 @@
 #cmakedefine SUPPORT_MOUSE_GESTURES 1
 /* Use busy wait loop for timing sync, if not defined, a high-resolution timer is setup and used */
 #cmakedefine SUPPORT_BUSY_WAIT_LOOP 1
+/* Wait for events passively (sleeping while no events) instead of polling them actively every frame */
+#cmakedefine SUPPORT_EVENTS_WAITING 1
 /* Allow automatic screen capture of current screen pressing F12, defined in KeyCallback() */
 #cmakedefine SUPPORT_SCREEN_CAPTURE 1
 /* Allow automatic gif recording of current screen pressing CTRL+F12, defined in KeyCallback() */
diff --git a/src/core.c b/src/core.c
index 2038e274..b2cb1813 100644
--- a/src/core.c
+++ b/src/core.c
@@ -50,6 +50,9 @@
 *   #define SUPPORT_BUSY_WAIT_LOOP
 *       Use busy wait loop for timing sync, if not defined, a high-resolution timer is setup and used
 *
+*   #define SUPPORT_EVENTS_WAITING
+*       Wait for events passively (sleeping while no events) instead of polling them actively every frame
+*
 *   #define SUPPORT_SCREEN_CAPTURE
 *       Allow automatic screen capture of current screen pressing F12, defined in KeyCallback()
 *
@@ -2933,7 +2936,6 @@ static void PollInputEvents(void)
         previousMouseState[i] = currentMouseState[i];
         currentMouseState[i] = currentMouseStateEvdev[i];
     }
-
 #endif
 
 #if defined(PLATFORM_DESKTOP) || defined(PLATFORM_WEB)
@@ -3007,8 +3009,12 @@ static void PollInputEvents(void)
         }
     }
 
+#if defined(SUPPORT_EVENTS_WAITING)
+    glfwWaitEvents();
+#else
     glfwPollEvents();       // Register keyboard/mouse events (callbacks)... and window events!
 #endif
+#endif      //defined(PLATFORM_DESKTOP)
 
 // Gamepad support using emscripten API
 // NOTE: GLFW3 joystick functionality not available in web