From f2c401a255bb8c0f0ae4f696be34adcea3f74ae2 Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Tue, 18 Feb 2020 16:31:13 +0000
Subject: [PATCH] Check that all states are present before allowing any
 stepping

---
 qrenderdoc/Windows/ShaderViewer.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/qrenderdoc/Windows/ShaderViewer.cpp b/qrenderdoc/Windows/ShaderViewer.cpp
index 53e3ced2d..49eb9d8f4 100644
--- a/qrenderdoc/Windows/ShaderViewer.cpp
+++ b/qrenderdoc/Windows/ShaderViewer.cpp
@@ -1324,7 +1324,7 @@ void ShaderViewer::on_watch_itemChanged(QTableWidgetItem *item)
 
 bool ShaderViewer::stepBack()
 {
-  if(!m_Trace)
+  if(!m_Trace || m_States.empty())
     return false;
 
   if(IsFirstState())
@@ -1378,7 +1378,7 @@ bool ShaderViewer::stepBack()
 
 bool ShaderViewer::stepNext()
 {
-  if(!m_Trace)
+  if(!m_Trace || m_States.empty())
     return false;
 
   if(IsLastState())
@@ -1417,7 +1417,7 @@ bool ShaderViewer::stepNext()
 
 void ShaderViewer::runToCursor()
 {
-  if(!m_Trace)
+  if(!m_Trace || m_States.empty())
     return;
 
   ScintillaEdit *cur = currentScintilla();
@@ -1529,7 +1529,7 @@ void ShaderViewer::run()
 
 void ShaderViewer::runTo(QVector<size_t> runToInstruction, bool forward, ShaderEvents condition)
 {
-  if(!m_Trace)
+  if(!m_Trace || m_States.empty())
     return;
 
   bool firstStep = true;