From 0f209a5362ff85724a62565d6b79f165c1b185aa Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 5 Jul 2006 13:44:07 +0000
Subject: [PATCH] From Eric Sokolowsky, "There is code in Image.cpp that
 calculates the size of a compressed image based on the internal format. There
 is similar code in the Texture class but it does not account for the ARB
 types. I modified the Texture class implementation to show a warning when an
 incomplete internal format is used to calculate the image size."

---
 src/osg/Texture.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/osg/Texture.cpp b/src/osg/Texture.cpp
index e58e550ed..04f84efd1 100644
--- a/src/osg/Texture.cpp
+++ b/src/osg/Texture.cpp
@@ -623,8 +623,13 @@ void Texture::getCompressedSize(GLenum internalFormat, GLint width, GLint height
 {
     if (internalFormat == GL_COMPRESSED_RGB_S3TC_DXT1_EXT || internalFormat == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT)
         blockSize = 8;
-    else
+    else if (internalFormat == GL_COMPRESSED_RGBA_S3TC_DXT3_EXT || internalFormat == GL_COMPRESSED_RGBA_S3TC_DXT5_EXT)
         blockSize = 16;
+    else
+    {
+        notify(WARN)<<"Texture::getCompressedSize(...) : cannot compute correct size of compressed format ("<<internalFormat<<") returning 0."<<std::endl;
+        blockSize = 0;
+    }
          
     size = ((width+3)/4)*((height+3)/4)*depth*blockSize;        
 }