Mercurial > sdl-ios-xcode
annotate src/timer/beos/SDL_systimer.c @ 1542:a8bf1aa21020
Fixed bug #15
SDL_blit_A.mmx-speed.patch.txt --
Speed improvements and a bugfix for the current GCC inline mmx
asm code:
- Changed some ops and removed some resulting useless ones.
- Added some instruction parallelism (some gain)
The resulting speed on my Xeon improved upto 35% depending on
the function (measured in fps).
- Fixed a bug where BlitRGBtoRGBSurfaceAlphaMMX() was
setting the alpha component on the destination surfaces (to
opaque-alpha) even when the surface had none.
SDL_blit_A.mmx-msvc.patch.txt --
MSVC mmx intrinsics version of the same GCC asm code.
MSVC compiler tries to parallelize the code and to avoid
register stalls, but does not always do a very good job.
Per-surface blending MSVC functions run quite a bit faster
than their pure-asm counterparts (upto 55% faster for 16bit
ones), but the per-pixel blending runs somewhat slower than asm.
- BlitRGBtoRGBSurfaceAlphaMMX and BlitRGBtoRGBPixelAlphaMMX (and all
variants) can now also handle formats other than (A)RGB8888. Formats
like RGBA8888 and some quite exotic ones are allowed -- like
RAGB8888, or actually anything having channels aligned on 8bit
boundary and full 8bit alpha (for per-pixel alpha blending).
The performance cost of this change is virtually 0 for per-surface
alpha blending (no extra ops inside the loop) and a single non-MMX
op inside the loop for per-pixel blending. In testing, the per-pixel
alpha blending takes a ~2% performance hit, but it still runs much
faster than the current code in CVS. If necessary, a separate function
with this functionality can be made.
This code requires Processor Pack for VC6.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 15 Mar 2006 15:39:29 +0000 |
| parents | d910939febfa |
| children | 92947e3a18db |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
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20 slouken@libsdl.org |
| 0 | 21 */ |
|
1402
d910939febfa
Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents:
1361
diff
changeset
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #include <be/kernel/OS.h> | |
| 25 | |
| 26 #include "SDL_thread.h" | |
| 27 #include "SDL_timer.h" | |
|
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
|
28 #include "../SDL_timer_c.h" |
| 0 | 29 |
| 30 static bigtime_t start; | |
| 31 | |
| 32 void SDL_StartTicks(void) | |
| 33 { | |
| 34 /* Set first ticks value */ | |
| 35 start = system_time(); | |
| 36 } | |
| 37 | |
| 38 Uint32 SDL_GetTicks(void) | |
| 39 { | |
| 40 return((system_time()-start)/1000); | |
| 41 } | |
| 42 | |
| 43 void SDL_Delay(Uint32 ms) | |
| 44 { | |
| 45 snooze(ms*1000); | |
| 46 } | |
| 47 | |
| 48 /* Data to handle a single periodic alarm */ | |
| 49 static int timer_alive = 0; | |
| 50 static SDL_Thread *timer = NULL; | |
| 51 | |
| 52 static int RunTimer(void *unused) | |
| 53 { | |
| 54 while ( timer_alive ) { | |
| 55 if ( SDL_timer_running ) { | |
| 56 SDL_ThreadedTimerCheck(); | |
| 57 } | |
| 58 SDL_Delay(10); | |
| 59 } | |
| 60 return(0); | |
| 61 } | |
| 62 | |
| 63 /* This is only called if the event thread is not running */ | |
| 64 int SDL_SYS_TimerInit(void) | |
| 65 { | |
| 66 timer_alive = 1; | |
| 67 timer = SDL_CreateThread(RunTimer, NULL); | |
| 68 if ( timer == NULL ) | |
| 69 return(-1); | |
| 70 return(SDL_SetTimerThreaded(1)); | |
| 71 } | |
| 72 | |
| 73 void SDL_SYS_TimerQuit(void) | |
| 74 { | |
| 75 timer_alive = 0; | |
| 76 if ( timer ) { | |
| 77 SDL_WaitThread(timer, NULL); | |
| 78 timer = NULL; | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 int SDL_SYS_StartTimer(void) | |
| 83 { | |
| 84 SDL_SetError("Internal logic error: BeOS uses threaded timer"); | |
| 85 return(-1); | |
| 86 } | |
| 87 | |
| 88 void SDL_SYS_StopTimer(void) | |
| 89 { | |
| 90 return; | |
| 91 } |