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annotate src/events/SDL_keyboard_c.h @ 2042:3908e1f808e1

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:56:36 +0000
parents c121d94672cb
children 047245361002
rev   line source
1895
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifndef _SDL_keyboard_c_h
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25 #define _SDL_keyboard_c_h
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26
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27 #include "SDL_keysym.h"
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28 #include "SDL_events.h"
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29
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30 typedef struct SDL_Keyboard SDL_Keyboard;
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31
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32 struct SDL_Keyboard
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33 {
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34 /* Free the keyboard when it's time */
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35 void (*FreeKeyboard) (SDL_Keyboard * keyboard);
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36
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37 /* Data common to all keyboards */
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38 SDL_WindowID focus;
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39 Uint16 modstate;
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40 Uint8 keystate[SDLK_LAST];
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41
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42 struct
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43 {
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44 int firsttime; /* if we check against the delay or repeat value */
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45 int delay; /* the delay before we start repeating */
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46 int interval; /* the delay between key repeat events */
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47 Uint32 timestamp; /* the time the first keydown event occurred */
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48
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49 SDL_Event evt; /* the event we are supposed to repeat */
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50 } repeat;
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51
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52 void *driverdata;
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53 };
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54
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55 /* Used by the OS keyboard code to detect whether or not to do UNICODE */
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56 #ifndef DEFAULT_UNICODE_TRANSLATION
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57 #define DEFAULT_UNICODE_TRANSLATION 0 /* Default off because of overhead */
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58 #endif
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59 extern int SDL_TranslateUNICODE;
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60
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61 /* Initialize the keyboard subsystem */
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62 extern int SDL_KeyboardInit(void);
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63
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64 /* Get the keyboard at an index */
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65 extern SDL_Keyboard *SDL_GetKeyboard(int index);
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66
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67 /* Add a keyboard, possibly reattaching at a particular index (or -1),
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68 returning the index of the keyboard, or -1 if there was an error.
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69 */
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70 extern int SDL_AddKeyboard(const SDL_Keyboard * keyboard, int index);
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71
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72 /* Remove a keyboard at an index, clearing the slot for later */
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73 extern void SDL_DelKeyboard(int index);
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74
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75 /* Clear the state of a keyboard at an index */
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76 extern void SDL_ResetKeyboard(int index);
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77
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78 /* Set the keyboard focus window */
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79 extern void SDL_SetKeyboardFocus(int index, SDL_WindowID windowID);
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80
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81 /* Send a keyboard event for a keyboard at an index */
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82 extern int SDL_SendKeyboardKey(int index, Uint8 state, Uint8 scancode,
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83 SDLKey key);
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84
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85 /* Send keyboard text input for a keyboard at an index */
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86 extern int SDL_SendKeyboardText(int index, const char *text);
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87
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88 /* Used by the event loop to queue pending keyboard repeat events */
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89 extern void SDL_CheckKeyRepeat(void);
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90
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91 /* Shutdown the keyboard subsystem */
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92 extern void SDL_KeyboardQuit(void);
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93
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94 #endif /* _SDL_keyboard_c_h */
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95
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96 /* vi: set ts=4 sw=4 expandtab: */