From d23a8007ea86817af2c893a546853e2f477b3dee Mon Sep 17 00:00:00 2001
From: Luke <17146677+LukeFZ@users.noreply.github.com>
Date: Sun, 17 Dec 2023 02:55:10 +0100
Subject: [PATCH] Fix ResizeBuffers not handling buffer count 0 properly

Calling ResizeBuffers with BufferCount = 0 means that we should preserve the original buffer count. Until now this did actually set the game buffer count to zero, causing crashes on subsequent GetBuffer calls.
---
 .../FrameInterpolationSwapchainDX12.cpp                     | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sdk/src/backends/dx12/FrameInterpolationSwapchain/FrameInterpolationSwapchainDX12.cpp b/sdk/src/backends/dx12/FrameInterpolationSwapchain/FrameInterpolationSwapchainDX12.cpp
index 580c8674..865e49c7 100644
--- a/sdk/src/backends/dx12/FrameInterpolationSwapchain/FrameInterpolationSwapchainDX12.cpp
+++ b/sdk/src/backends/dx12/FrameInterpolationSwapchain/FrameInterpolationSwapchainDX12.cpp
@@ -1307,7 +1307,11 @@ HRESULT STDMETHODCALLTYPE FrameInterpolationSwapChainDX12::ResizeBuffers(UINT Bu
     const UINT fiAdjustedFlags = getInterpolationEnabledSwapChainFlags(SwapChainFlags);
 
     // update params expected by the application
-    gameBufferCount_ = BufferCount;
+    // a buffer count of zero means we need to preserve the original count
+    if (BufferCount != 0) 
+    {
+        gameBufferCount_ = BufferCount;
+    }
     gameFlags_       = SwapChainFlags;
 
     HRESULT hr = real()->ResizeBuffers(0 /* preserve count */, Width, Height, NewFormat, fiAdjustedFlags);