All functions and variables are now defined in graphics.cpp.
Before, the functions would be compiled again and again for every source
file, now it is compiled only once, halving the size of the stripped
starfighter binary.
There is no reason to have objects which contain only static functions
and no variables. These functions have been moved to the global
namespace and are now defined in .cpp files. The math functions are very
small and have been put in math.h and made static inline.
Most .h files were not used to declare the externally visible variables
and functions of the .cpp files, but only to #include things and declare
things that were needed by that .cpp file itself. This resulted in a lot
of duplication.
Now the .h files only declare what is externally visible from the
corresponding .cpp files. Starfighter.h includes all the other .h files,
and all .cpp files only #include "Starfighter.h". Functions and
variables that were not used outside the .cpp file that contained them
were marked static. Variables defined in .h files were moved to the
appropriate .cpp files.
This increases efficiency significantly. Before, callgrind estimated that 58%
of the CPU time was spent in doInfo(), taking roughly 1.6 kcycles on average
per call. After, only 0.13 kcycles on average per call are used (12x speedup),
and only 14% of the CPU time is spent in doInfo().
Guus Sliepen
Guus Sliepen