GPU: Ensure rendering operations occur within GPU render boundaries.

This is required by the Metal backend to perform flushing of temporary objective-C resources. This is implemented as a global autoreleasepool, and is to ensure consistency such that all rendering operations, whether called via events, or via main loop will be within an autoreleasepool.

Authored by Apple: Michael Parkin-White

Ref T96261

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D15900

2 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/windowmanager/intern/wm_event_system.cc b/source/blender/windowmanager/intern/wm_event_system.cc
index c26696704dd..de01c2080da 100644
--- a/source/blender/windowmanager/intern/wm_event_system.cc
+++ b/source/blender/windowmanager/intern/wm_event_system.cc
@@ -56,6 +56,8 @@
 #include "ED_util.h"
 #include "ED_view3d.h"
 
+#include "GPU_context.h"
+
 #include "RNA_access.h"
 
 #include "UI_interface.h"
@@ -484,11 +486,15 @@ static void wm_event_execute_timers(bContext *C)
 
 void wm_event_do_notifiers(bContext *C)
 {
+  /* Ensure insiude render boundary. */
+  GPU_render_begin();
+
   /* Run the timer before assigning `wm` in the unlikely case a timer loads a file, see T80028. */
   wm_event_execute_timers(C);
 
   wmWindowManager *wm = CTX_wm_manager(C);
   if (wm == nullptr) {
+    GPU_render_end();
     return;
   }
 
@@ -691,6 +697,8 @@ void wm_event_do_notifiers(bContext *C)
 
   /* Auto-run warning. */
   wm_test_autorun_warning(C);
+
+  GPU_render_end();
 }
 
 static bool wm_event_always_pass(const wmEvent *event)
diff --git a/source/blender/windowmanager/intern/wm_window.c b/source/blender/windowmanager/intern/wm_window.c
index dea875becb1..8d091a02eb5 100644
--- a/source/blender/windowmanager/intern/wm_window.c
+++ b/source/blender/windowmanager/intern/wm_window.c
@@ -580,6 +580,7 @@ static void wm_window_ghostwindow_add(wmWindowManager *wm,
 
   if (ghostwin) {
     win->gpuctx = GPU_context_create(ghostwin, NULL);
+    GPU_render_begin();
 
     /* needed so we can detect the graphics card below */
     GPU_init();
@@ -621,6 +622,7 @@ static void wm_window_ghostwindow_add(wmWindowManager *wm,
     GPU_clear_color(0.55f, 0.55f, 0.55f, 1.0f);
 
     // GHOST_SetWindowState(ghostwin, GHOST_kWindowStateModified);
+    GPU_render_end();
   }
   else {
     wm_window_set_drawable(wm, prev_windrawable, false);
@@ -1504,6 +1506,7 @@ static bool wm_window_timer(const bContext *C)
 void wm_window_process_events(const bContext *C)
 {
   BLI_assert(BLI_thread_is_main());
+  GPU_render_begin();
 
   bool has_event = GHOST_ProcessEvents(g_system, false); /* `false` is no wait. */
 
@@ -1516,6 +1519,7 @@ void wm_window_process_events(const bContext *C)
    * processing/dispatching but also handling. */
   has_event |= wm_xr_events_handle(CTX_wm_manager(C));
 #endif
+  GPU_render_end();
 
   /* When there is no event, sleep 5 milliseconds not to use too much CPU when idle.
    *