bastien.bouclet@gmail.com 2011-06-13 05:50:58 PDT
Static pixel format initialization has not been updated to reflect header
changes in SDL_blit_N.c
The attached patch fixes Altivec support for me. altivec.h is needed for some
systems.
Port SDL 1.3 to the Nintendo DS
by Darren Alton, mentored by Sam Lantinga
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403188
in preparation for support for general color channel modulation.
Removed and consolidated some data in the blit info.
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402619
The AltiVec blitters don't compile, since they require __VEC__ to be enabled in
order for the compiler to understand "vector" and friends (i.e. do AltiVec)
But you don't want to turn AltiVec on globally, since then the code would only
run on a G4 (there are already runtime tests, before using the AltiVec
variants)
The solution here is to enable AltiVec locally, for the actual AltiVec code.
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401754
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.
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401546
Make sure every source file includes SDL_config.h, so the proper system
headers are chosen.
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401406
