From bfe3c36e7367619e0470209fed26e1d8c021a221 Mon Sep 17 00:00:00 2001
From: Rosalie Wanders <rosalie@mailbox.org>
Date: Fri, 24 Sep 2021 18:26:12 +0200
Subject: [PATCH] WindowsWGL: use adaptive vsync when supported

---
 src/Graphics/OpenGLContext/windows/WindowsWGL.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Graphics/OpenGLContext/windows/WindowsWGL.cpp b/src/Graphics/OpenGLContext/windows/WindowsWGL.cpp
index 690b9aed..77df7bcb 100644
--- a/src/Graphics/OpenGLContext/windows/WindowsWGL.cpp
+++ b/src/Graphics/OpenGLContext/windows/WindowsWGL.cpp
@@ -102,7 +102,15 @@ bool WindowsWGL::start()
 
 		if (strstr(wglextensions, "WGL_EXT_swap_control") != nullptr) {
 			PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
-			wglSwapIntervalEXT(config.video.verticalSync);
+
+			// use adaptive vsync when supported and
+			// when vsync is enabled
+			if (strstr(wglextensions, "WGL_EXT_swap_control_tear") != nullptr &&
+				config.video.verticalSync > 0) {
+				wglSwapIntervalEXT(-1);
+			} else {
+				wglSwapIntervalEXT(config.video.verticalSync);
+			}
 		}
 	}