Mercurial > sdl-ios-xcode
view include/SDL_keyboard.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 | 1ff64ad478b2 |
children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
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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 file for SDL keyboard event handling */ #ifndef _SDL_keyboard_h #define _SDL_keyboard_h #include "SDL_stdinc.h" #include "SDL_error.h" #include "SDL_keysym.h" #include "begin_code.h" /* Set up for C function definitions, even when using C++ */ #ifdef __cplusplus extern "C" { #endif /* Keysym structure - The scancode is hardware dependent, and should not be used by general applications. If no hardware scancode is available, it will be 0. - The 'unicode' translated character is only available when character translation is enabled by the SDL_EnableUNICODE() API. If non-zero, this is a UNICODE character corresponding to the keypress. If the high 9 bits of the character are 0, then this maps to the equivalent ASCII character: char ch; if ( (keysym.unicode & 0xFF80) == 0 ) { ch = keysym.unicode & 0x7F; } else { An international character.. } */ typedef struct SDL_keysym { Uint8 scancode; /* hardware specific scancode */ SDLKey sym; /* SDL virtual keysym */ SDLMod mod; /* current key modifiers */ Uint16 unicode; /* translated character */ } SDL_keysym; /* This is the mask which refers to all hotkey bindings */ #define SDL_ALL_HOTKEYS 0xFFFFFFFF /* Function prototypes */ /* * Enable/Disable UNICODE translation of keyboard input. * This translation has some overhead, so translation defaults off. * If 'enable' is 1, translation is enabled. * If 'enable' is 0, translation is disabled. * If 'enable' is -1, the translation state is not changed. * It returns the previous state of keyboard translation. */ extern DECLSPEC int SDLCALL SDL_EnableUNICODE(int enable); /* * Enable/Disable keyboard repeat. Keyboard repeat defaults to off. * 'delay' is the initial delay in ms between the time when a key is * pressed, and keyboard repeat begins. * 'interval' is the time in ms between keyboard repeat events. */ #define SDL_DEFAULT_REPEAT_DELAY 500 #define SDL_DEFAULT_REPEAT_INTERVAL 30 /* * If 'delay' is set to 0, keyboard repeat is disabled. */ extern DECLSPEC int SDLCALL SDL_EnableKeyRepeat(int delay, int interval); extern DECLSPEC void SDLCALL SDL_GetKeyRepeat(int *delay, int *interval); /* * Get a snapshot of the current state of the keyboard. * Returns an array of keystates, indexed by the SDLK_* syms. * Used: * Uint8 *keystate = SDL_GetKeyState(NULL); * if ( keystate[SDLK_RETURN] ) ... <RETURN> is pressed. */ extern DECLSPEC Uint8 * SDLCALL SDL_GetKeyState(int *numkeys); /* * Get the current key modifier state */ extern DECLSPEC SDLMod SDLCALL SDL_GetModState(void); /* * Set the current key modifier state * This does not change the keyboard state, only the key modifier flags. */ extern DECLSPEC void SDLCALL SDL_SetModState(SDLMod modstate); /* * Get the name of an SDL virtual keysym */ extern DECLSPEC char * SDLCALL SDL_GetKeyName(SDLKey key); /* Ends C function definitions when using C++ */ #ifdef __cplusplus } #endif #include "close_code.h" #endif /* _SDL_keyboard_h */