From d16a8024d53b86a618db0feaa4369b8a82be0549 Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Sat, 12 Sep 2015 17:30:35 +0200
Subject: [PATCH] Make sure we have some fallback for locating position
 element. Refs #149

* If no position element is selected at all that's really confusing, so
  worst case we just pick the first attribute.
* Making it intuitive/obvious that you can change which attribute is
  displayed as mesh - that's a different problem.
---
 renderdocui/Windows/BufferViewer.cs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/renderdocui/Windows/BufferViewer.cs b/renderdocui/Windows/BufferViewer.cs
index 46cd4f59b..3d3a4aecb 100644
--- a/renderdocui/Windows/BufferViewer.cs
+++ b/renderdocui/Windows/BufferViewer.cs
@@ -2365,6 +2365,7 @@ namespace renderdocui.Windows
                             break;
                         }
                     }
+                    // look for an exact match
                     for (int i = 0; posEl == -1 && i < ui.m_Input.BufferFormats.Length; i++)
                     {
                         FormatElement el = ui.m_Input.BufferFormats[i];
@@ -2378,6 +2379,33 @@ namespace renderdocui.Windows
                             break;
                         }
                     }
+                    // try anything containing position
+                    for (int i = 0; posEl == -1 && i < ui.m_Input.BufferFormats.Length; i++)
+                    {
+                        FormatElement el = ui.m_Input.BufferFormats[i];
+
+                        if (el.name.ToUpperInvariant().Contains("POSITION"))
+                        {
+                            posEl = i;
+                            break;
+                        }
+                    }
+                    // OK last resort, just look for 'pos'
+                    for (int i = 0; posEl == -1 && i < ui.m_Input.BufferFormats.Length; i++)
+                    {
+                        FormatElement el = ui.m_Input.BufferFormats[i];
+
+                        if (el.name.ToUpperInvariant().Contains("POS"))
+                        {
+                            posEl = i;
+                            break;
+                        }
+                    }
+                    // if we still have absolutely nothing, just use the first available element
+                    if (posEl == -1 && ui.m_Input.BufferFormats.Length > 0)
+                    {
+                        posEl = 0;
+                    }
                 }
 
                 m_PosElement[(int)stage] = posEl;