ok, looking of the oprofile output of libgl, r200_dri and qw-client-glx, I decided to hunt for the function
texsubimage2d_bgr888_to_rgba8888 which is at the top of the list at 22.6% of the time.
I have tracked down the function to a define, but from there I don't know where it comes from
from ./src/mesa/main/texutil.c
#define CONVERT_RGBA8888( name ) \ static GLboolean \ convert_##name##_rgba8888( const struct convert_info *convert ) \
this function sets
else if ( convert->format == GL_RGB && \ convert->type == GL_UNSIGNED_BYTE ) \ { \ tab = name##_tab_bgr888_to_rgba8888; \ } \
and the end of the function does
return tab[index]( convert );
but I cannot find for the life of me where the value/array/what ever tab gets set to is comming from, a grep for bgr888_to_rgba8888 only reveils
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> ~/Mesa $ grep -r bgr888_to_rgba8888 . ./src/mesa/main/texutil.c:#define TAG(x) x##_bgr888_to_rgba8888 ./src/mesa/main/texutil.c: tab = name##_tab_bgr888_to_rgba8888; \
can anyone help in locating this function please so I can atleast try to find out if this function is slow per call or just called alot (as oprofile doesn't give you that information)
Each time texutil_tmp.h is included by texutil.c, eight new functions are generated, four for texsubimage2d and four for texsubimage3d. Those functions are listed in the arrays seen at lines 488 and 500 of texutil_tmp.h
The four functions are chosen from depending on whether special pixel unpacking is needed and whether the destination image has a row stride != row size.
Mesa makes extensive use of macros and code templates to generate code. It can be hard to follow sometimes. I didn't write the code in question and it would take me a while to fully understand it too.
-Brian
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