Tim Nikias wrote:
> 
> What I want is to write some macros which keep
> track of the resolutions of meshes which were
> saved to disk.
> 
> [...]

I have the impression that you want the functionality that is usually
obtained with a makefile.  You generate certain data files and render a
scene which is using that data and later change certain settings in the
scene and want a method automatically generating certain data files
again.  A makefile would take care of this.  It checks the modification
dates of the files and rebuilds files that depend on those files that have
been changed.  Of course it can't check the content of the files if
certain values are changed.  

Implementing something similar in SDL would be quite impossible since you
don't have access to the file modification dates and also can't read
binary files (determining if an image file is changed would be impossible
for example).

> 
> Am I still talking nonsense?

I never said it is nonsense, i just did not understand it.

Christoph

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