I''m using Jason Allen''s glBMP image library to load my png textures. Problem is, I want to load the images from a Visual C++ resource instad of from a file. I''ve read about using the png_set_read_fn() function to use an alternate data source but I don''t really get it. Can someone please give me a working example of how to do this?

instead of using glbmp to learn this function, download the original libpng (ie the original, what glbmp uses) and it has a shirt load of examples in it.

Note, you also need zlib for compression.
http://www.libpng.org/

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Beer - the love catalyst
good ol'' homepage

I would reccomend useing DevIL for loading images, openil.sourceforge.net

There are some great examples from the original distribution of the libpng library. Grab it at http://www.libpng.org They show how to create your own read and write. I have to do this because I use C++ iostream.

If you mean how to use resources, that''s a whole different matter. Consult a decent Windows programming book.


Premature optimizations can only slow down your project even more.

I know how to use resources, I have successfully loaded raw images from a resource to a texture. I use this code to open the resource

HRSRC rsrc = FindResource(NULL,MAKEINTRESOURCE(resid),RT_RCDATA);
HGLOBAL MemoryHandle = LoadResource(NULL, rsrc);
BYTE *picture = (BYTE *)LockResource(MemoryHandle);

But how do I move the data from *picture into a libpng structure?