[thanos] Warmed up compute probe after initial dialogs load.

Telegram/CMakeLists.txt

@@ -1833,6 +1833,8 @@ PRIVATE
     ui/effects/thanos_effect_controller.h
     ui/effects/thanos_effect_renderer.cpp
     ui/effects/thanos_effect_renderer.h
+    ui/effects/thanos_effect_session.cpp
+    ui/effects/thanos_effect_session.h
     ui/effects/send_action_animations.cpp
     ui/effects/send_action_animations.h
     ui/image/image.cpp

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -74,6 +74,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/chat/chats_filter_tag.h"
 #include "ui/effects/ripple_animation.h"
 #include "ui/effects/loading_element.h"
+#include "ui/effects/thanos_effect_session.h"
 #include "ui/widgets/multi_select.h"
 #include "ui/widgets/menu/menu_add_action_callback_factory.h"
 #include "ui/unread_badge.h"
@@ -375,6 +376,8 @@ InnerWidget::InnerWidget(
 		refresh();
 	}, lifetime());
 
+	Ui::ScheduleThanosEffectWarmUp(&session(), lifetime());
+
 	rpl::merge(
 		session().settings().archiveCollapsedChanges() | rpl::map_to(false),
 		session().data().chatsFilters().changed() | rpl::map_to(true),

Telegram/SourceFiles/ui/effects/thanos_effect.cpp

@@ -21,6 +21,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include <rhi/qrhi.h>
 #ifdef Q_OS_UNIX
 #include <QOffscreenSurface>
+#include <QSurfaceFormat>
 #endif
 #endif
 
@@ -57,7 +58,7 @@ namespace {
 	// here fails (no GL context, software fallback without compute,
 	// driver bug), treat compute as unsupported and refuse the effect
 	// rather than show an uninitialized swap-chain.
-	auto format = QRhiGles2InitParams::adjustedFormat();
+	auto format = QSurfaceFormat::defaultFormat();
 	auto offscreen = std::unique_ptr<QOffscreenSurface>(
 		QRhiGles2InitParams::newFallbackSurface(format));
 	if (!offscreen) {
@@ -101,6 +102,12 @@ bool ThanosEffect::Supported() {
 #endif
 }
 
+void ThanosEffect::WarmUp() {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
+	(void)RhiComputeSupportedCached();
+#endif
+}
+
 ThanosEffect::ThanosEffect(not_null<QWidget*> parent)
 : _parent(parent) {
 }

Telegram/SourceFiles/ui/effects/thanos_effect.h

@@ -35,6 +35,12 @@ public:
 	void raise();
 
 	[[nodiscard]] static bool Supported();
+	// Runs the (potentially slow, 10–300ms) QRhi capability probe
+	// synchronously on the main thread and caches the result. Safe to
+	// call multiple times. If not called, `Supported()` will lazily
+	// probe on first use — prefer warming it up during idle time so the
+	// first message deletion doesn't hitch.
+	static void WarmUp();
 
 private:
 	void ensureSurface();

Telegram/SourceFiles/ui/effects/thanos_effect_session.cpp

@@ -0,0 +1,32 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "ui/effects/thanos_effect_session.h"
+
+#include "ui/effects/thanos_effect.h"
+#include "data/data_folder.h"
+#include "data/data_session.h"
+#include "main/main_session.h"
+
+namespace Ui {
+
+void ScheduleThanosEffectWarmUp(
+		not_null<Main::Session*> session,
+		rpl::lifetime &lifetime) {
+	if (session->data().chatsListLoaded(nullptr)) {
+		ThanosEffect::WarmUp();
+		return;
+	}
+	session->data().chatsListLoadedEvents(
+	) | rpl::filter([](Data::Folder *folder) {
+		return !folder;
+	}) | rpl::take(1) | rpl::on_next([] {
+		ThanosEffect::WarmUp();
+	}, lifetime);
+}
+
+} // namespace Ui

Telegram/SourceFiles/ui/effects/thanos_effect_session.h

@@ -0,0 +1,20 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+namespace Main {
+class Session;
+} // namespace Main
+
+namespace Ui {
+
+void ScheduleThanosEffectWarmUp(
+	not_null<Main::Session*> session,
+	rpl::lifetime &lifetime);
+
+} // namespace Ui