1 files changed, 16 insertions, 7 deletions

diff --git a/linden/indra/llrender/llimagegl.cpp b/linden/indra/llrender/llimagegl.cpp
index fd934b9..454a5bb 100644
--- a/linden/indra/llrender/llimagegl.cpp
+++ b/linden/indra/llrender/llimagegl.cpp
@@ -61,6 +61,8 @@ S32 LLImageGL::sCount					= 0;
 BOOL LLImageGL::sGlobalUseAnisotropic   = FALSE;
 F32 LLImageGL::sLastFrameTime                   = 0.f;
 
+BOOL LLImageGL::sRefCheck = TRUE ;
+
 std::set<LLImageGL*> LLImageGL::sImageList;
 
 //----------------------------------------------------------------------------
@@ -276,7 +278,10 @@ LLImageGL::LLImageGL(const LLImageRaw* imageraw, BOOL usemipmaps)
         setSize(0, 0, 0);
         sImageList.insert(this);
         sCount++;
+
+        sRefCheck = FALSE ;
         createGLTexture(0, imageraw); 
+        sRefCheck = TRUE ;
 }
 
 LLImageGL::~LLImageGL()
@@ -333,17 +338,19 @@ void LLImageGL::cleanup()
 
 //----------------------------------------------------------------------------
 
+//this function is used to check the size of a texture image.
+//so dim should be a positive number
 static bool check_power_of_two(S32 dim)
 {
-        while(dim > 1)
+        if(dim < 0)
         {
-                if (dim & 1)
-                {
-                        return false;
-                }
-                dim >>= 1;
+                return false ;
         }
-        return true;
+        if(!dim)//0 is a power-of-two number
+        {
+                return true ;
+        }
+        return !(dim & (dim - 1)) ;
 }
 
 //static
@@ -420,6 +427,8 @@ void LLImageGL::dump()
 
 BOOL LLImageGL::bindTextureInternal(const S32 stage) const
 {
+        llassert_always(!sRefCheck || (getNumRefs() > 0 && getNumRefs() < 100000)) ;    
+        
         if (gGLManager.mIsDisabled)
         {
                 llwarns << "Trying to bind a texture while GL is disabled!" << llendl;