Mercurial > sdl-ios-xcode
view src/video/xbios/SDL_xbios_blowup.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 | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* Blowup extension definitions Patrice Mandin */ #include <mint/falcon.h> #include "SDL_xbios.h" #include "SDL_xbios_blowup.h" void SDL_XBIOS_BlowupInit(_THIS, blow_cookie_t *cookie_blow) { int i, num_mode, bank; blow_mode_t *blow_mode; /* Add bit 15 for old modes */ for (i=0;i<XBIOS_nummodes;i++) { XBIOS_modelist[i].number |= 1<<15; } /* Add Blowup modes for 8 and 16 bpp */ for (num_mode=3; num_mode<5; num_mode++) { bank = cookie_blow->num_mode[num_mode]; blow_mode = &(cookie_blow->blowup_modes[num_mode+(bank*5)]); /* Check extended mode enabled */ if (blow_mode->enabled == 0) { /* Check monitor needed for this mode */ if ((blow_mode->monitor == cookie_blow->montype) || ((blow_mode->monitor == MONITOR_TV) && (cookie_blow->montype == MONITOR_RGB)) || ((blow_mode->monitor == MONITOR_RGB) && (cookie_blow->montype == MONITOR_TV))) { /* we can use this extended mode */ SDL_XBIOS_AddMode(this, num_mode == 3 ? BPS8 : BPS16, blow_mode->width + 1, blow_mode->height + 1, num_mode == 3 ? 8 : 16, SDL_FALSE ); } } } }