From 3444c952614ac2f7af3ce217a24e5d3c0b1efc4e Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 27 Feb 2002 22:00:47 +0000
Subject: [PATCH] Integrated support for GL_CLAMP_TO_BORDER_ARB extension to
 osg::Texture, submitted by Sasa Bistrovic.

---
 include/osg/Texture | 7 ++++++-
 src/osg/Texture.cpp | 9 +++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/include/osg/Texture b/include/osg/Texture
index ed55e955a..364f66d3d 100644
--- a/include/osg/Texture
+++ b/include/osg/Texture
@@ -53,6 +53,10 @@
 #define GL_CLAMP_TO_EDGE                  0x812F
 #endif
 
+#ifndef GL_CLAMP_TO_BORDER_ARB
+#define GL_CLAMP_TO_BORDER_ARB 0x812D
+#endif
+
 #ifndef GL_GENERATE_MIPMAP_SGIS
 #define GL_GENERATE_MIPMAP_SGIS           0x8191
 #define GL_GENERATE_MIPMAP_HINT_SGIS      0x8192
@@ -145,7 +149,8 @@ class SG_EXPORT Texture : public StateAttribute
             CLAMP  = GL_CLAMP,
             CLAMP_TO_EDGE = GL_CLAMP_TO_EDGE,
             REPEAT = GL_REPEAT,
-            MIRROR = GL_MIRRORED_REPEAT_IBM
+            MIRROR = GL_MIRRORED_REPEAT_IBM,
+            CLAMP_TO_BORDER_ARB = GL_CLAMP_TO_BORDER_ARB
         };
 
         /** Set the texture wrap mode.*/
diff --git a/src/osg/Texture.cpp b/src/osg/Texture.cpp
index 16fdc4d24..b1ea15925 100644
--- a/src/osg/Texture.cpp
+++ b/src/osg/Texture.cpp
@@ -275,6 +275,15 @@ void Texture::applyImmediateMode(State& state) const
             wt = CLAMP;
     }
 
+    static bool s_borderClampSupported = isGLExtensionSupported("GL_ARB_texture_border_clamp");
+    if(!s_borderClampSupported)
+    {
+        if(ws == CLAMP_TO_BORDER_ARB)
+            ws = CLAMP;
+        if(wt == CLAMP_TO_BORDER_ARB)
+            wt = CLAMP;
+    }
+
     glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, ws );
     glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wt );