From ca58cb2453e6d9ef44d799e394ee9950b7a35b30 Mon Sep 17 00:00:00 2001
From: Cappy Ishihara <cappy@cappuchino.xyz>
Date: Wed, 21 Aug 2024 03:56:53 +0700
Subject: [PATCH] Check if current GPU supports Vulkan DRM modifiers when
 `--backend=auto` is used.

This works around #1218 by making use of the new backend option added in #1321,
but adds a check to automatically fall back to the SDL backend if the current
GPU does not support Vulkan DRM modifiers.
---
 src/main.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index ca4001249..bc6b16904 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -817,9 +817,13 @@ int main(int argc, char **argv)
 	if ( eCurrentBackend == gamescope::GamescopeBackend::Auto )
 	{
 		if ( g_pOriginalWaylandDisplay != NULL )
-			eCurrentBackend = gamescope::GamescopeBackend::Wayland;
-		else if ( g_pOriginalDisplay != NULL )
-			eCurrentBackend = gamescope::GamescopeBackend::SDL;
+			// Additional check if the current GPU supports Vulkan DRM modifiers
+			// Fallback to SDL if not supported (e.g Older AMD GPUs like Polaris 10/20)
+			if ( vulkan_supports_modifiers() ) 
+				eCurrentBackend = gamescope::GamescopeBackend::Wayland;
+			else
+				eCurrentBackend = gamescope::GamescopeBackend::SDL;
+
 		else
 			eCurrentBackend = gamescope::GamescopeBackend::DRM;
 	}