add missing _

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git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2041 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/gfx/src/impl/cgl_offscreen_buffer.cc

@@ -51,7 +51,7 @@ OffscreenBuffer::OffscreenBuffer(unsigned int width, unsigned int height,
   if (shared) {
     err=CGLCreateContext(pix_format_, CGLGetCurrentContext(), &context_);    
   } else {
-    err=CGLCreateContext(pix_format, NULL, &context_);
+    err=CGLCreateContext(pix_format_, NULL, &context_);
   }
   if(err) {
     LOGN_ERROR("error creating offscreen rendering context. "