Mercurial > sdl-ios-xcode
view src/loadso/beos/SDL_sysloadso.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 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /* System dependent library loading routines */ #include <stdio.h> #include <be/kernel/image.h> #include "SDL_loadso.h" void *SDL_LoadObject(const char *sofile) { void *handle = NULL; const char *loaderror = "Unknown error"; image_id library_id = load_add_on(sofile); if ( library_id == B_ERROR ) { loaderror = "BeOS error"; } else { handle = (void *)(library_id); } if ( handle == NULL ) { SDL_SetError("Failed loading %s: %s", sofile, loaderror); } return(handle); } void *SDL_LoadFunction(void *handle, const char *name) { void *symbol = NULL; const char *loaderror = "Unknown error"; image_id library_id = (image_id)handle; if ( get_image_symbol(library_id, name, B_SYMBOL_TYPE_TEXT, &symbol) != B_NO_ERROR ) { loaderror = "Symbol not found"; } if ( symbol == NULL ) { SDL_SetError("Failed loading %s: %s", name, loaderror); } return(symbol); } void SDL_UnloadObject(void *handle) { image_id library_id; if ( handle != NULL ) { library_id = (image_id)handle; unload_add_on(library_id); } }