forked from enlightenment/efl
Documentation for neon, word and metric caching in README.in
SVN revision: 50633
This commit is contained in:
parent
2df94e37ff
commit
8573ddf384
|
@ -240,6 +240,65 @@ To be documented...
|
||||||
...
|
...
|
||||||
|
|
||||||
|
|
||||||
|
--enable-cpu-neon
|
||||||
|
This enables support for the Arm Cortex-A8 and later Neon register
|
||||||
|
set. In particular it will use neon optimised code for rotations and
|
||||||
|
drawing with the software engines. Open GL based renderers will gain
|
||||||
|
nothing from the use of neon.
|
||||||
|
|
||||||
|
To use neon with gcc-4.4 you need a post-2009 gcc and options
|
||||||
|
something like: -mcpu=cortex-a8 -mfloat-abi=softfp -mfpu=neon
|
||||||
|
Note that this slightly slows down non-optimised parts of evas but
|
||||||
|
the gains in drawing are more then worth it overall.
|
||||||
|
|
||||||
|
This is enabled by default, and turns off if a small test program is
|
||||||
|
unable to compile.
|
||||||
|
|
||||||
|
Performance is at least 50%, and in some real world tests approaches
|
||||||
|
100%.
|
||||||
|
|
||||||
|
If you have any issues with neon, please report them to either the
|
||||||
|
edevel mailing list or Brett Nash <nash@nash.id.uau>
|
||||||
|
|
||||||
|
--enable-word-cache
|
||||||
|
Cache rendered words and draw them as a single object, instead of
|
||||||
|
individual characters. This is a big gain for things like neon which
|
||||||
|
draw large runs effectively.
|
||||||
|
|
||||||
|
However it is useless on GL and similar backends as the cost in
|
||||||
|
sending a word sized texture kills the performance gain (and GL is
|
||||||
|
pretty good at drawing lots of small things anyway).
|
||||||
|
|
||||||
|
By default words (strings) of more then 50 characters are not cached.
|
||||||
|
The system caches 40 words by default, but this can be changed by
|
||||||
|
setting EVAS_WORD_CACHE_MAX_WORDS to another number. Setting it to 0
|
||||||
|
will disable word-cache at run time.
|
||||||
|
|
||||||
|
Text based benchmarks are 50-100% quicker.
|
||||||
|
|
||||||
|
If you have any issues with word caching, please report them to either
|
||||||
|
the edevel mailing list or Brett Nash <nash@nash.id.uau>
|
||||||
|
|
||||||
|
For GL see metric caching...
|
||||||
|
|
||||||
|
--enable-metric-cache
|
||||||
|
Metric caching saves character metrics between characters in words.
|
||||||
|
This enables it to render words much quicker as it avoids things like
|
||||||
|
space calculations and kerning calculation.
|
||||||
|
|
||||||
|
The cache seize is also controlled by EVAS_WORD_CACHE_MAX_WORDS
|
||||||
|
|
||||||
|
It is useful for GL in particular, although software engines do get
|
||||||
|
some gain.
|
||||||
|
|
||||||
|
Generally it is recommended you enable either word or metric caching,
|
||||||
|
depending on your engine use. If you are using software, enable word
|
||||||
|
caching (and neon on arm if you can), for GL, turn on metric caching.
|
||||||
|
|
||||||
|
If you have any issues with metric caching, please report them to either
|
||||||
|
the edevel mailing list or Brett Nash <nash@nash.id.uau>
|
||||||
|
|
||||||
|
|
||||||
------------------------------------------------------------------------------
|
------------------------------------------------------------------------------
|
||||||
COMPILING AND INSTALLING:
|
COMPILING AND INSTALLING:
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue