From ba9e3555503d911b07664b9ed4a5c5a02c325c6e Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 18 Jan 2007 17:00:42 +0000
Subject: [PATCH] Added support for stencil GL_INCR_WRAP and GL_DECR_WRAP
 operations

---
 include/osg/Stencil            | 10 +++++++++-
 src/osgPlugins/osg/Stencil.cpp |  4 ++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/osg/Stencil b/include/osg/Stencil
index 5fd8c9764..28dd60e4a 100644
--- a/include/osg/Stencil
+++ b/include/osg/Stencil
@@ -18,6 +18,12 @@
 
 namespace osg {
 
+#ifndef GL_INCR_WRAP
+#define GL_INCR_WRAP 0x8507
+#define GL_DECR_WRAP 0x8508
+#endif
+
+
 /** Encapsulate OpenGL glStencilFunc/Op/Mask functions.
 */     
 class OSG_EXPORT Stencil : public StateAttribute
@@ -102,7 +108,9 @@ class OSG_EXPORT Stencil : public StateAttribute
             REPLACE = GL_REPLACE,
             INCR = GL_INCR,
             DECR = GL_DECR,
-            INVERT = GL_INVERT
+            INVERT = GL_INVERT,
+            INCR_WRAP = GL_INCR_WRAP,
+            DECR_WRAP = GL_DECR_WRAP
         };
         
         /** set the operations to apply when the various stencil and depth 
diff --git a/src/osgPlugins/osg/Stencil.cpp b/src/osgPlugins/osg/Stencil.cpp
index 02a75c2b8..4c5cedd54 100644
--- a/src/osgPlugins/osg/Stencil.cpp
+++ b/src/osgPlugins/osg/Stencil.cpp
@@ -158,6 +158,8 @@ bool Stencil_matchOperationStr(const char* str,Stencil::Operation& op)
     else if (strcmp(str,"INCR")==0) op = Stencil::INCR;
     else if (strcmp(str,"DECR")==0) op = Stencil::DECR;
     else if (strcmp(str,"INVERT")==0) op = Stencil::INVERT;
+    else if (strcmp(str,"INCR_WRAP")==0) op = Stencil::INCR_WRAP;
+    else if (strcmp(str,"DECR_WRAP")==0) op = Stencil::DECR_WRAP;
     else return false;
     return true;
 }
@@ -172,6 +174,8 @@ const char* Stencil_getOperationStr(Stencil::Operation op)
         case(Stencil::INCR): return "INCR";
         case(Stencil::DECR): return "DECR";
         case(Stencil::INVERT): return "INVERT";
+        case(Stencil::INCR_WRAP): return "INCR_WRAP";
+        case(Stencil::DECR_WRAP): return "DECR_WRAP";
     }
     return "";
 }