From 7e1e87af1fcfdd69c0ccd77347752e4ff35b1084 Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Thu, 12 Mar 2015 00:43:13 +0000
Subject: [PATCH] Fix crash if shader debug comes back with empty trace array

* The current step wasn't being clamped correctly, so it would be set
  to -1 then used to index.
---
 renderdocui/Windows/ShaderViewer.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/renderdocui/Windows/ShaderViewer.cs b/renderdocui/Windows/ShaderViewer.cs
index 91c43484c..47092fc66 100644
--- a/renderdocui/Windows/ShaderViewer.cs
+++ b/renderdocui/Windows/ShaderViewer.cs
@@ -73,9 +73,9 @@ namespace renderdocui.Windows
             }
             set
             {
-                if (m_Trace != null && m_Trace.states != null)
+                if (m_Trace != null && m_Trace.states != null && m_Trace.states.Length > 0)
                 {
-                    CurrentStep_ = Math.Min(m_Trace.states.Length - 1, Math.Max(0, value));
+                    CurrentStep_ = Helpers.Clamp(value, 0, m_Trace.states.Length - 1);
                 }
                 else
                 {
@@ -765,7 +765,7 @@ namespace renderdocui.Windows
 
         public void UpdateDebugging()
         {
-            if (m_Trace == null || m_Trace.states.Length == 0)
+            if (m_Trace == null || m_Trace.states == null || m_Trace.states.Length == 0)
             {
                 //curInstruction.Text = "0";