diff options
| author | rubidium <rubidium@openttd.org> | 2009-10-15 17:41:06 +0000 |
|---|---|---|
| committer | rubidium <rubidium@openttd.org> | 2009-10-15 17:41:06 +0000 |
| commit | f4f4044859b9ae89f70dcffc459b81d769c0a93f (patch) | |
| tree | 88f1b2f84ce673f3489d6fec18479fb2714da5c1 /src/video/allegro_v.cpp | |
| parent | 7f52cfe72bd6471395aa841c7814d2083c179d9f (diff) | |
| download | openttd-f4f4044859b9ae89f70dcffc459b81d769c0a93f.tar.xz | |
(svn r17776) -Codechange: [SDL] make "update the video card"-process asynchronious. Profiling with gprof etc. hasn't shown us that DrawSurfaceToScreen takes a significant amount of CPU; only using TIC/TOC it became apparant that it was a heavy CPU-cycle user or that it was waiting for something.
The benefit of making this function asynchronious ranges from 2%-25% (real time) during fast forward on dual core/hyperthreading-enabled CPUs; 8bpp improvements are, in my test cases, significantly smaller than 32bpp improvements.
On single core non-hyperthreading-enabled CPUs the extra locking/scheduling costs up to 1% extra realtime in fast forward. You can use -v sdl:no_threads to disable threading and undo this loss.
During normal non-fast-forwarded games the benefit/costs are negligable except when the gameloop takes more than about 90% of the time of a tick.
Note that allegro's performance does not improve with this system, likely due to their way of getting data to the video card. It is not implemented for the OS X/Windows video backends, unless (ofcourse) SDL is used there.
Funny is that the performance of the 32bpp(-anim) blitter is, at least in some test cases, significantly faster (more than 10%) than the 8bpp(-optimized) blitter when looking at real time in fast forward on a dual core CPU; it was slower.
The idea comes from a paper/report by Idar Borlaug and Knut Imar Hagen.
Diffstat (limited to 'src/video/allegro_v.cpp')
| -rw-r--r-- | src/video/allegro_v.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/video/allegro_v.cpp b/src/video/allegro_v.cpp index e566a8dd5..a92a115e2 100644 --- a/src/video/allegro_v.cpp +++ b/src/video/allegro_v.cpp @@ -7,7 +7,12 @@ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>. */ -/** @file allegro_v.cpp Implementation of the Allegro video driver. */ +/** + * @file allegro_v.cpp Implementation of the Allegro video driver. + * @note Implementing threaded pushing of data to the display is + * not faster (it's a few percent slower) in contrast to the + * results gained with threading it for SDL. + */ #ifdef WITH_ALLEGRO |