From 4f31c558bcd4ddcdbb0f2fe4321e6b083a604a77 Mon Sep 17 00:00:00 2001
From: Jonah Williams <campfish91@gmail.com>
Date: Mon, 7 Mar 2022 10:06:09 -0800
Subject: [PATCH] [windows] use angle fast path on d3d11 backend
 (flutter/engine#31830)

---
 .../flutter/shell/platform/windows/angle_surface_manager.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/engine/src/flutter/shell/platform/windows/angle_surface_manager.cc b/engine/src/flutter/shell/platform/windows/angle_surface_manager.cc
index 83dac6bd85a..28d41cfc631 100644
--- a/engine/src/flutter/shell/platform/windows/angle_surface_manager.cc
+++ b/engine/src/flutter/shell/platform/windows/angle_surface_manager.cc
@@ -95,6 +95,12 @@ bool AngleSurfaceManager::Initialize() {
       // behalf of the application when it gets suspended.
       EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE,
       EGL_TRUE,
+
+      // This extension allows angle to render directly on a D3D swapchain
+      // in the correct orientation on D3D11.
+      EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE,
+      EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE,
+
       EGL_NONE,
   };