Fixed the render viewport not updating when the metal view resizes

When the phone is in portrait mode and the window is in landscape mode, the view changes orientation after layoutSubviews runs. In this case we need some way of notifying the application that the Metal view has changed.

include/SDL3/SDL_events.h

@@ -130,6 +130,7 @@ typedef enum SDL_EventType
     SDL_EVENT_WINDOW_MOVED,             /**< Window has been moved to data1, data2 */
     SDL_EVENT_WINDOW_RESIZED,           /**< Window has been resized to data1xdata2 */
     SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED,/**< The pixel size of the window has changed to data1xdata2 */
+    SDL_EVENT_WINDOW_METAL_VIEW_RESIZED,/**< The pixel size of a Metal view associated with the window has changed */
     SDL_EVENT_WINDOW_MINIMIZED,         /**< Window has been minimized */
     SDL_EVENT_WINDOW_MAXIMIZED,         /**< Window has been maximized */
     SDL_EVENT_WINDOW_RESTORED,          /**< Window has been restored to normal size and position */

src/events/SDL_events.c

@@ -502,6 +502,7 @@ static void SDL_LogEvent(const SDL_Event *event)
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_MOVED);
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_RESIZED);
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED);
+        SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_METAL_VIEW_RESIZED);
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_SAFE_AREA_CHANGED);
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_MINIMIZED);
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_MAXIMIZED);

src/render/SDL_render.c

@@ -830,7 +830,8 @@ static int SDLCALL SDL_RendererEventWatch(void *userdata, SDL_Event *event)
             }
 
             if (event->type == SDL_EVENT_WINDOW_RESIZED ||
-                event->type == SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED) {
+                event->type == SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED ||
+                event->type == SDL_EVENT_WINDOW_METAL_VIEW_RESIZED) {
                 UpdateMainViewDimensions(renderer);
                 UpdateLogicalPresentation(renderer);
             } else if (event->type == SDL_EVENT_WINDOW_HIDDEN) {

src/test/SDL_test_common.c

@@ -1614,6 +1614,10 @@ static void SDLTest_PrintEvent(const SDL_Event *event)
         SDL_Log("SDL EVENT: Window %" SDL_PRIu32 " changed pixel size to %" SDL_PRIs32 "x%" SDL_PRIs32,
                 event->window.windowID, event->window.data1, event->window.data2);
         break;
+    case SDL_EVENT_WINDOW_METAL_VIEW_RESIZED:
+        SDL_Log("SDL EVENT: Window %" SDL_PRIu32 " changed metal view size",
+                event->window.windowID);
+        break;
     case SDL_EVENT_WINDOW_SAFE_AREA_CHANGED: {
         SDL_Rect rect;
 

src/video/uikit/SDL_uikitmetalview.m

@@ -31,6 +31,7 @@
 #if defined(SDL_VIDEO_DRIVER_UIKIT) && (defined(SDL_VIDEO_VULKAN) || defined(SDL_VIDEO_METAL))
 
 #include "../SDL_sysvideo.h"
+#include "../../events/SDL_windowevents_c.h"
 
 #import "SDL_uikitwindow.h"
 #import "SDL_uikitmetalview.h"
@@ -67,7 +68,13 @@
     CGSize size = self.bounds.size;
     size.width *= self.layer.contentsScale;
     size.height *= self.layer.contentsScale;
-    ((CAMetalLayer *)self.layer).drawableSize = size;
+
+    CAMetalLayer *metallayer = ((CAMetalLayer *)self.layer);
+    if (metallayer.drawableSize.width != size.width ||
+        metallayer.drawableSize.height != size.height) {
+        metallayer.drawableSize = size;
+        SDL_SendWindowEvent([self getSDLWindow], SDL_EVENT_WINDOW_METAL_VIEW_RESIZED, 0, 0);
+    }
 }
 
 @end

src/video/uikit/SDL_uikitview.h

@@ -32,6 +32,7 @@
 - (instancetype)initWithFrame:(CGRect)frame;
 
 - (void)setSDLWindow:(SDL_Window *)window;
+- (SDL_Window *)getSDLWindow;
 
 #if !defined(SDL_PLATFORM_TVOS) && defined(__IPHONE_13_4)
 - (UIPointerRegion *)pointerInteraction:(UIPointerInteraction *)interaction regionForRequest:(UIPointerRegionRequest *)request defaultRegion:(UIPointerRegion *)defaultRegion API_AVAILABLE(ios(13.4));

src/video/uikit/SDL_uikitview.m

@@ -148,6 +148,11 @@ extern int SDL_AppleTVRemoteOpenedAsJoystick;
     sdlwindow = window;
 }
 
+- (SDL_Window *)getSDLWindow
+{
+    return sdlwindow;
+}
+
 #if !defined(SDL_PLATFORM_TVOS) && defined(__IPHONE_13_4)
 - (UIPointerRegion *)pointerInteraction:(UIPointerInteraction *)interaction regionForRequest:(UIPointerRegionRequest *)request defaultRegion:(UIPointerRegion *)defaultRegion API_AVAILABLE(ios(13.4))
 {