reverted to 'worse formatting' so we have a place to put out brakepoint again...

src/ACGL/OpenGL/Debug.cc

@@ -65,11 +65,18 @@ void ACGLRegisterDefaultDebugCallback()
 }
 
 //! place a brakepoint in here to find the source of a problem!
-void APIENTRY ACGL_KHR_default_debug_callback( GLenum _source, GLenum _type, GLuint _id, GLenum _severity, GLsizei _length, const GLchar *_message, const void *_userParam)
+void APIENTRY ACGL_KHR_default_debug_callback( GLenum _source, GLenum _type, GLuint _id, GLenum _severity, GLsizei /*_length*/, const GLchar *_message, const void* /* _userParam*/ )
 {
-    ostream& stream = (_type == GL_DEBUG_TYPE_ERROR) ? static_cast<ostream&>(error()) : static_cast<ostream&>(debug());
+    // yes, this could be implemented with less dublicated code, but the
+    // point here is to have one code path which gets only called in case of an error
+    // so we have a convenient place to put out brakepoint and haing the error message to
+    // be printed first...
+    if (_type == GL_DEBUG_TYPE_ERROR) {
+        error() << "<" << _id << "> severity: " << debugSeverityName(_severity) << " source: " << debugSourceName(_source) << ": " << _message << endl;
+    } else {
+        debug() << "<" << _id << "> severity: " << debugSeverityName(_severity) << " source: " << debugSourceName(_source) << ": " << _message << endl;
+    }
 
-    stream << debugSourceName(_source) << " " << debugTypeName(_type) << ": " << _message << " (id: " << _id << ", severity: " << debugSeverityName(_severity) << ")" << endl;
 
     // delete all errors to not create another error log for the same problem:
     while ( glGetError() != GL_NO_ERROR ) {}