Jerome Glisse wrote:
> Hi,
>
> Roland pointed me to this yesterday (src/mesa/main/glheader.h):
> /*
> * Either define MESA_BIG_ENDIAN or MESA_LITTLE_ENDIAN.
> * Do not use them unless absolutely necessary!
> * Try to use a runtime test instead.
> * For now, only used by some DRI hardware drivers for color/texel packing.
> */
>
> So i am wondering what is best from a driver point of view,
> use this macro or use a runtime test ? Maybe this comment
> isn't revealent anymore. Any insight on this are welcome.
I'd prefer to use a run-time test since it's a little more robust (one
less preprocessor symbol to worry about). Though in some places we
really do need a compile-time symbol.
Here's the code used in core Mesa:
const GLuint ui = 1;
const GLubyte littleEndian = *((const GLubyte *) &ui);
I should probably put that into a reusable inline function in
imports.h ...
-Brian
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