Mercurial > sdl-ios-xcode
annotate README.DC @ 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> |
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date | Wed, 15 Mar 2006 15:39:29 +0000 |
parents | c17d82103614 |
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1 SDL for Dreamcast (beta2) |
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2 |
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3 BERO |
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4 berobero@users.sourceforge.net |
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5 |
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6 http://www.geocities.co.jp/Playtown/2004/ |
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7 |
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8 this work with kos-newlib |
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9 http://sourceforge.net/projects/dcquake/ |
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10 |
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11 compile |
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12 - source environ.sh (from the KOS distribution) |
509
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13 - make -f Makefile.dc |
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14 |
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15 compile with gl support |
dad72daf44b3
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16 - install latest libgl from http://sourceforge.net/projects/dcquake/ |
dad72daf44b3
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17 - uncomment GL=1 in Makefile.dc |
dad72daf44b3
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18 - make -f Makefile.dc clean |
dad72daf44b3
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19 - make -f Makefile.dc |
dad72daf44b3
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20 |
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21 install |
dad72daf44b3
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22 - copy include/*.h and libSDL.a or libSDL_gl.a for your enviroment |
dad72daf44b3
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23 |
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24 changelog: |
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25 |
dad72daf44b3
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26 beta2 |
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27 - OpenGL support |
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28 - Hardware page flip support |
dad72daf44b3
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29 |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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30 beta |
dad72daf44b3
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31 - thread, timer don't tested so much. |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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32 - not support OpenGL |