From b502d64ada19529f0ce7fd35d1d1536130eaa3be Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Mon, 16 Mar 2020 12:14:12 +0000
Subject: [PATCH] Don't read invalid srcOpers when evaluating texture sample
 operations

---
 renderdoc/driver/shaders/dxbc/dxbc_debug.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp b/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp
index 751af81bf..a35b9bc42 100644
--- a/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp
+++ b/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp
@@ -3884,8 +3884,12 @@ void ThreadState::StepNext(ShaderDebugState *state, DebugAPIWrapper *apiWrapper,
         ddyCalc = srcOpers[4];
       }
 
-      int multisampleIndex = srcOpers[2].value.i.x;
-      float lodOrCompareValue = srcOpers[3].value.f.x;
+      int multisampleIndex = 0;
+      if(srcOpers.size() >= 3)
+        multisampleIndex = srcOpers[2].value.i.x;
+      float lodOrCompareValue = 0.0f;
+      if(srcOpers.size() >= 4)
+        lodOrCompareValue = srcOpers[3].value.f.x;
       if(op.operation == OPCODE_GATHER4_PO_C)
         lodOrCompareValue = srcOpers[4].value.f.x;