From 33d7971364d69c7512ad410e1fa68a0c3448992f Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Thu, 2 Apr 2020 16:47:53 +0100
Subject: [PATCH] Mark integer divide by zero as "generated NaN of Inf" in
 shader debug

---
 renderdoc/driver/shaders/dxbc/dxbc_debug.cpp  |  5 ++++
 .../driver/shaders/spirv/spirv_debug.cpp      | 24 ++++++++++++++-----
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp b/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp
index a35b9bc42..63d176cdc 100644
--- a/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp
+++ b/renderdoc/driver/shaders/dxbc/dxbc_debug.cpp
@@ -1913,6 +1913,11 @@ void ThreadState::StepNext(ShaderDebugState *state, DebugAPIWrapper *apiWrapper,
           quot.value.uv[i] = srcOpers[1].value.uv[i] / srcOpers[2].value.uv[i];
           rem.value.uv[i] = srcOpers[1].value.uv[i] - (quot.value.uv[i] * srcOpers[2].value.uv[i]);
         }
+        else
+        {
+          if(state)
+            state->flags |= ShaderEvents::GeneratedNanOrInf;
+        }
       }
 
       if(op.operands[0].type != TYPE_NULL)
diff --git a/renderdoc/driver/shaders/spirv/spirv_debug.cpp b/renderdoc/driver/shaders/spirv/spirv_debug.cpp
index 869205aae..c8f180035 100644
--- a/renderdoc/driver/shaders/spirv/spirv_debug.cpp
+++ b/renderdoc/driver/shaders/spirv/spirv_debug.cpp
@@ -784,20 +784,32 @@ void ThreadState::StepNext(ShaderDebugState *state,
       {
         for(uint8_t c = 0; c < var.columns; c++)
         {
-          if(b.value.uv[c] == 0)
-            var.value.uv[c] = ~0U;
-          else
+          if(b.value.iv[c] != 0)
+          {
             var.value.iv[c] /= b.value.iv[c];
+          }
+          else
+          {
+            var.value.uv[c] = ~0U;
+            if(state)
+              state->flags |= ShaderEvents::GeneratedNanOrInf;
+          }
         }
       }
       else if(opdata.op == Op::UDiv)
       {
         for(uint8_t c = 0; c < var.columns; c++)
         {
-          if(b.value.uv[c] == 0)
-            var.value.uv[c] = ~0U;
-          else
+          if(b.value.uv[c] != 0)
+          {
             var.value.uv[c] /= b.value.uv[c];
+          }
+          else
+          {
+            var.value.uv[c] = ~0U;
+            if(state)
+              state->flags |= ShaderEvents::GeneratedNanOrInf;
+          }
         }
       }
       else if(opdata.op == Op::IAdd)