Reviewed fullscreen switch on PLATFORM_WEB

The previous implementation somewhat break the expected behaviour for games and examples when pressing the `Fullscreen` button in the provided `shell.html`.

Just reverted for the moment for further investigation.

src/rcore.c

@@ -628,11 +628,13 @@ static int32_t AndroidInputCallback(struct android_app *app, AInputEvent *event)
 #endif
 
 #if defined(PLATFORM_WEB)
+static EM_BOOL EmscriptenFullscreenChangeCallback(int eventType, const EmscriptenFullscreenChangeEvent *event, void *userData);
+static EM_BOOL EmscriptenWindowResizedCallback(int eventType, const EmscriptenUiEvent *event, void *userData);
+static EM_BOOL EmscriptenResizeCallback(int eventType, const EmscriptenUiEvent *event, void *userData);
+
 static EM_BOOL EmscriptenMouseCallback(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
 static EM_BOOL EmscriptenTouchCallback(int eventType, const EmscriptenTouchEvent *touchEvent, void *userData);
 static EM_BOOL EmscriptenGamepadCallback(int eventType, const EmscriptenGamepadEvent *gamepadEvent, void *userData);
-static EM_BOOL EmscriptenResizeCallback(int eventType, const EmscriptenUiEvent *e, void *userData);
-
 #endif
 
 #if defined(PLATFORM_RPI) || defined(PLATFORM_DRM)
@@ -861,13 +863,18 @@ void InitWindow(int width, int height, const char *title)
 #endif
 
 #if defined(PLATFORM_WEB)
+    // Setup callback funtions for the DOM events
+    emscripten_set_fullscreenchange_callback("#canvas", NULL, 1, EmscriptenFullscreenChangeCallback);
+
+    // WARNING: Below resize code was breaking fullscreen mode for sample games and examples, it needs review
     // Check fullscreen change events(note this is done on the window since most browsers don't support this on #canvas)
     //emscripten_set_fullscreenchange_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, NULL, 1, EmscriptenResizeCallback);
     // Check Resize event (note this is done on the window since most browsers don't support this on #canvas)
-    emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, NULL, 1, EmscriptenResizeCallback);
+    //emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, NULL, 1, EmscriptenResizeCallback);
     // Trigger this once to get initial window sizing
-    EmscriptenResizeCallback(EMSCRIPTEN_EVENT_RESIZE, NULL, NULL);
+    //EmscriptenResizeCallback(EMSCRIPTEN_EVENT_RESIZE, NULL, NULL);
-    // Support keyboard events
+    
+    // Support keyboard events -> Not used, GLFW.JS takes care of that
     //emscripten_set_keypress_callback("#canvas", NULL, 1, EmscriptenKeyboardCallback);
     //emscripten_set_keydown_callback("#canvas", NULL, 1, EmscriptenKeyboardCallback);
 
@@ -1193,6 +1200,7 @@ void ToggleFullscreen(void)
     if (CORE.Window.flags & FLAG_VSYNC_HINT) glfwSwapInterval(1);
 #endif
 #if defined(PLATFORM_WEB)
+/*
     EM_ASM
     (
         // This strategy works well while using raylib minimal web shell for emscripten,
@@ -1200,14 +1208,17 @@ void ToggleFullscreen(void)
         // is a good strategy but maybe games prefer to keep current canvas resolution and
         // display it in fullscreen, adjusting monitor resolution if possible
         if (document.fullscreenElement) document.exitFullscreen();
-        else Module.requestFullscreen(false, true);
+        else Module.requestFullscreen(true, true); //false, true);
     );
-
+*/
+    //EM_ASM(Module.requestFullscreen(false, false););
 /*
     if (!CORE.Window.fullscreen)
     {
         // Option 1: Request fullscreen for the canvas element
-        // This option does not seem to work at all
+        // This option does not seem to work at all:
+        // emscripten_request_pointerlock() and emscripten_request_fullscreen() are affected by web security,
+        // the user must click once on the canvas to hide the pointer or transition to full screen
         //emscripten_request_fullscreen("#canvas", false);
 
         // Option 2: Request fullscreen for the canvas element with strategy
@@ -1236,20 +1247,25 @@ void ToggleFullscreen(void)
         int width, height;
         emscripten_get_canvas_element_size("#canvas", &width, &height);
         TRACELOG(LOG_WARNING, "Emscripten: Enter fullscreen: Canvas size: %i x %i", width, height);
+
+        CORE.Window.fullscreen = true;          // Toggle fullscreen flag
+        CORE.Window.flags |= FLAG_FULLSCREEN_MODE;
     }
     else
     {
         //emscripten_exit_fullscreen();
-        emscripten_exit_soft_fullscreen();
+        //emscripten_exit_soft_fullscreen();
 
         int width, height;
         emscripten_get_canvas_element_size("#canvas", &width, &height);
         TRACELOG(LOG_WARNING, "Emscripten: Exit fullscreen: Canvas size: %i x %i", width, height);
+        
+        CORE.Window.fullscreen = false;          // Toggle fullscreen flag
+        CORE.Window.flags &= ~FLAG_FULLSCREEN_MODE;
     }
 */
 
     CORE.Window.fullscreen = !CORE.Window.fullscreen;          // Toggle fullscreen flag
-    CORE.Window.flags ^= FLAG_FULLSCREEN_MODE;
 #endif
 #if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI) || defined(PLATFORM_DRM)
     TRACELOG(LOG_WARNING, "SYSTEM: Failed to toggle to windowed mode");
@@ -4099,11 +4115,13 @@ static bool InitGraphicsDevice(int width, int height)
 #else
     TRACELOG(LOG_INFO, "DISPLAY: No graphic card set, trying platform-gpu-card");
     CORE.Window.fd = open("/dev/dri/by-path/platform-gpu-card",  O_RDWR); // VideoCore VI (Raspberry Pi 4)
+
     if ((-1 == CORE.Window.fd) || (drmModeGetResources(CORE.Window.fd) == NULL))
     {
         TRACELOG(LOG_INFO, "DISPLAY: Failed to open platform-gpu-card, trying card1");
         CORE.Window.fd = open("/dev/dri/card1", O_RDWR); // Other Embedded
     }
+
     if ((-1 == CORE.Window.fd) || (drmModeGetResources(CORE.Window.fd) == NULL))
     {
         TRACELOG(LOG_INFO, "DISPLAY: Failed to open graphic card1, trying card0");
@@ -5022,39 +5040,6 @@ static void ErrorCallback(int error, const char *description)
     TRACELOG(LOG_WARNING, "GLFW: Error: %i Description: %s", error, description);
 }
 
-#if defined(PLATFORM_WEB)
-EM_JS(int, GetCanvasWidth, (), { return canvas.clientWidth; });
-EM_JS(int, GetCanvasHeight, (), { return canvas.clientHeight; });
-
-static EM_BOOL EmscriptenResizeCallback(int eventType, const EmscriptenUiEvent *e, void *userData)
-{
-    // Don't resize non-resizeable windows
-    if ((CORE.Window.flags & FLAG_WINDOW_RESIZABLE) == 0) return 1;
-
-    // This event is called whenever the window changes sizes,
-    // so the size of the canvas object is explicitly retrieved below
-    int width = GetCanvasWidth();
-    int height = GetCanvasHeight();
-    emscripten_set_canvas_element_size("#canvas",width,height);
-
-    SetupViewport(width, height);    // Reset viewport and projection matrix for new size
-
-    CORE.Window.currentFbo.width = width;
-    CORE.Window.currentFbo.height = height;
-    CORE.Window.resizedLastFrame = true;
-
-    if (IsWindowFullscreen()) return 1;
-
-    // Set current screen size
-    CORE.Window.screen.width = width;
-    CORE.Window.screen.height = height;
-
-    // NOTE: Postprocessing texture is not scaled to new size
-
-    return 0;
-}
-#endif
-
 // GLFW3 WindowSize Callback, runs when window is resizedLastFrame
 // NOTE: Window resizing not allowed by default
 static void WindowSizeCallback(GLFWwindow *window, int width, int height)
@@ -5544,11 +5529,82 @@ static int32_t AndroidInputCallback(struct android_app *app, AInputEvent *event)
 #endif
 
 #if defined(PLATFORM_WEB)
+// Register fullscreen change events
+static EM_BOOL EmscriptenFullscreenChangeCallback(int eventType, const EmscriptenFullscreenChangeEvent *event, void *userData)
+{
+    // TODO.
+
+    return 1;   // The event was consumed by the callback handler
+}
+
+// Register window resize event
+static EM_BOOL EmscriptenWindowResizedCallback(int eventType, const void *reserved, void *userData)
+{
+    // TODO.
+
+    return 1;   // The event was consumed by the callback handler
+}
+
+EM_JS(int, GetCanvasWidth, (), { return canvas.clientWidth; });
+EM_JS(int, GetCanvasHeight, (), { return canvas.clientHeight; });
+
+// Register DOM element resize event
+static EM_BOOL EmscriptenResizeCallback(int eventType, const EmscriptenUiEvent *event, void *userData)
+{
+    // Don't resize non-resizeable windows
+    if ((CORE.Window.flags & FLAG_WINDOW_RESIZABLE) == 0) return 1;
+
+    // This event is called whenever the window changes sizes,
+    // so the size of the canvas object is explicitly retrieved below
+    int width = GetCanvasWidth();
+    int height = GetCanvasHeight();
+    emscripten_set_canvas_element_size("#canvas",width,height);
+
+    SetupViewport(width, height);    // Reset viewport and projection matrix for new size
+
+    CORE.Window.currentFbo.width = width;
+    CORE.Window.currentFbo.height = height;
+    CORE.Window.resizedLastFrame = true;
+
+    if (IsWindowFullscreen()) return 1;
+
+    // Set current screen size
+    CORE.Window.screen.width = width;
+    CORE.Window.screen.height = height;
+
+    // NOTE: Postprocessing texture is not scaled to new size
+
+    return 0;
+}
+
 // Register mouse input events
 static EM_BOOL EmscriptenMouseCallback(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData)
 {
     // This is only for registering mouse click events with emscripten and doesn't need to do anything
-    return 0;
+
+    return 1;   // The event was consumed by the callback handler
+}
+
+// Register connected/disconnected gamepads events
+static EM_BOOL EmscriptenGamepadCallback(int eventType, const EmscriptenGamepadEvent *gamepadEvent, void *userData)
+{
+    /*
+    TRACELOGD("%s: timeStamp: %g, connected: %d, index: %ld, numAxes: %d, numButtons: %d, id: \"%s\", mapping: \"%s\"",
+           eventType != 0? emscripten_event_type_to_string(eventType) : "Gamepad state",
+           gamepadEvent->timestamp, gamepadEvent->connected, gamepadEvent->index, gamepadEvent->numAxes, gamepadEvent->numButtons, gamepadEvent->id, gamepadEvent->mapping);
+
+    for (int i = 0; i < gamepadEvent->numAxes; ++i) TRACELOGD("Axis %d: %g", i, gamepadEvent->axis[i]);
+    for (int i = 0; i < gamepadEvent->numButtons; ++i) TRACELOGD("Button %d: Digital: %d, Analog: %g", i, gamepadEvent->digitalButton[i], gamepadEvent->analogButton[i]);
+    */
+
+    if ((gamepadEvent->connected) && (gamepadEvent->index < MAX_GAMEPADS))
+    {
+        CORE.Input.Gamepad.ready[gamepadEvent->index] = true;
+        sprintf(CORE.Input.Gamepad.name[gamepadEvent->index],"%s",gamepadEvent->id);
+    }
+    else CORE.Input.Gamepad.ready[gamepadEvent->index] = false;
+
+    return 1;   // The event was consumed by the callback handler
 }
 
 // Register touch input events
@@ -5601,29 +5657,7 @@ static EM_BOOL EmscriptenTouchCallback(int eventType, const EmscriptenTouchEvent
     ProcessGestureEvent(gestureEvent);
 #endif
 
-    return 1;
+    return 1;   // The event was consumed by the callback handler
-}
-
-// Register connected/disconnected gamepads events
-static EM_BOOL EmscriptenGamepadCallback(int eventType, const EmscriptenGamepadEvent *gamepadEvent, void *userData)
-{
-    /*
-    TRACELOGD("%s: timeStamp: %g, connected: %d, index: %ld, numAxes: %d, numButtons: %d, id: \"%s\", mapping: \"%s\"",
-           eventType != 0? emscripten_event_type_to_string(eventType) : "Gamepad state",
-           gamepadEvent->timestamp, gamepadEvent->connected, gamepadEvent->index, gamepadEvent->numAxes, gamepadEvent->numButtons, gamepadEvent->id, gamepadEvent->mapping);
-
-    for (int i = 0; i < gamepadEvent->numAxes; ++i) TRACELOGD("Axis %d: %g", i, gamepadEvent->axis[i]);
-    for (int i = 0; i < gamepadEvent->numButtons; ++i) TRACELOGD("Button %d: Digital: %d, Analog: %g", i, gamepadEvent->digitalButton[i], gamepadEvent->analogButton[i]);
-    */
-
-    if ((gamepadEvent->connected) && (gamepadEvent->index < MAX_GAMEPADS))
-    {
-        CORE.Input.Gamepad.ready[gamepadEvent->index] = true;
-        sprintf(CORE.Input.Gamepad.name[gamepadEvent->index],"%s",gamepadEvent->id);
-    }
-    else CORE.Input.Gamepad.ready[gamepadEvent->index] = false;
-
-    return 0;
 }
 #endif