Mercurial > sdl-ios-xcode
view src/video/SDL_cursor_c.h @ 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 a1b03ba2fcd0 |
line wrap: on
line source
/* 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" /* Useful variables and functions from SDL_cursor.c */ #include "SDL_mouse.h" extern int SDL_CursorInit(Uint32 flags); extern void SDL_CursorPaletteChanged(void); extern void SDL_DrawCursor(SDL_Surface *screen); extern void SDL_DrawCursorNoLock(SDL_Surface *screen); extern void SDL_EraseCursor(SDL_Surface *screen); extern void SDL_EraseCursorNoLock(SDL_Surface *screen); extern void SDL_UpdateCursor(SDL_Surface *screen); extern void SDL_ResetCursor(void); extern void SDL_MoveCursor(int x, int y); extern void SDL_CursorQuit(void); #define INLINE_MOUSELOCK #ifdef INLINE_MOUSELOCK /* Inline (macro) versions of the mouse lock functions */ #include "SDL_mutex.h" extern SDL_mutex *SDL_cursorlock; #define SDL_LockCursor() \ do { \ if ( SDL_cursorlock ) { \ SDL_mutexP(SDL_cursorlock); \ } \ } while ( 0 ) #define SDL_UnlockCursor() \ do { \ if ( SDL_cursorlock ) { \ SDL_mutexV(SDL_cursorlock); \ } \ } while ( 0 ) #else extern void SDL_LockCursor(void); extern void SDL_UnlockCursor(void); #endif /* INLINE_MOUSELOCK */ /* Only for low-level mouse cursor drawing */ extern SDL_Cursor *SDL_cursor; extern void SDL_MouseRect(SDL_Rect *area); /* State definitions for the SDL cursor */ #define CURSOR_VISIBLE 0x01 #define CURSOR_USINGSW 0x10 #define SHOULD_DRAWCURSOR(X) \ (((X)&(CURSOR_VISIBLE|CURSOR_USINGSW)) == \ (CURSOR_VISIBLE|CURSOR_USINGSW)) extern volatile int SDL_cursorstate;