From 2815523744035ffd54589f1fbe5f93c4bc28ae77 Mon Sep 17 00:00:00 2001
From: Jake Turner <jake@evansturner.co.uk>
Date: Mon, 23 Feb 2026 10:56:22 +0000
Subject: [PATCH] D3D12 Mesh Dispatch PostVS show error when mesh buffer is too
 large

---
 renderdoc/driver/d3d12/d3d12_postvs.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/renderdoc/driver/d3d12/d3d12_postvs.cpp b/renderdoc/driver/d3d12/d3d12_postvs.cpp
index 6aaa86237..c07631a97 100644
--- a/renderdoc/driver/d3d12/d3d12_postvs.cpp
+++ b/renderdoc/driver/d3d12/d3d12_postvs.cpp
@@ -2479,6 +2479,15 @@ void D3D12Replay::InitPostMSBuffers(uint32_t eventId)
       desc.SampleDesc.Quality = 0;
       desc.Width = layout.meshletByteSize * totalNumMeshlets;
 
+      if(desc.Width > INT32_MAX)
+      {
+        SAFE_RELEASE(annotatedSig);
+        SAFE_RELEASE(ampBuffer);
+        ret.meshout.status = "Mesh output buffer is too large, try reducing dispatch dimensions";
+        RDCERR("%s", ret.meshout.status.c_str());
+        return;
+      }
+
       D3D12_HEAP_PROPERTIES heapProps;
       heapProps.Type = D3D12_HEAP_TYPE_DEFAULT;
       heapProps.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN;