From a11a9e99da0b5cf45d530ef6745035d35e24b6b9 Mon Sep 17 00:00:00 2001
From: sharkautarch <128002472+sharkautarch@users.noreply.github.com>
Date: Tue, 18 Jun 2024 22:12:07 -0400
Subject: [PATCH] WSI: prefetcher: fix issue w/ attempting to prefetch xcb
 stuff for pure wayland surfaces

---
 layer/VkLayer_FROG_gamescope_wsi.cpp | 2 +-
 layer/xcb_helpers.hpp                | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/layer/VkLayer_FROG_gamescope_wsi.cpp b/layer/VkLayer_FROG_gamescope_wsi.cpp
index f26819a60..ce011dcd7 100644
--- a/layer/VkLayer_FROG_gamescope_wsi.cpp
+++ b/layer/VkLayer_FROG_gamescope_wsi.cpp
@@ -1234,7 +1234,7 @@ namespace GamescopeWSILayer {
             continue;
           }
 
-          xcb::Prefetcher prefetcher(gamescopeSurface->connection, gamescopeSurface->window);
+          auto prefetcher = xcb::Prefetcher::GetPrefetcherIf(!gamescopeSurface->isWayland(), gamescopeSurface->connection, gamescopeSurface->window);
           const bool canBypass = gamescopeSurface->canBypassXWayland();
           if (canBypass != gamescopeSwapchain->isBypassingXWayland)
             UpdateSwapchainResult(canBypass ? VK_SUBOPTIMAL_KHR : VK_ERROR_OUT_OF_DATE_KHR);
diff --git a/layer/xcb_helpers.hpp b/layer/xcb_helpers.hpp
index 72d0ec092..b7ea9701e 100644
--- a/layer/xcb_helpers.hpp
+++ b/layer/xcb_helpers.hpp
@@ -16,6 +16,13 @@ namespace xcb {
   
   //Note: this class is currently only meant to be used within GamescopeWSILayer::VkDeviceOverrides::QueuePresentKHR:
   struct Prefetcher {
+    static std::optional<Prefetcher> GetPrefetcherIf(bool bCond, xcb_connection_t* connection, const xcb_window_t window) {
+       if (bCond)
+         return std::optional<Prefetcher>(std::in_place_t{}, connection, window);
+       
+       return std::nullopt;
+    }
+    
     explicit Prefetcher(xcb_connection_t* connection, const xcb_window_t window) {
         g_cache = {
             .window = window,