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annotate src/video/ps2gs/SDL_gsvideo.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 99210400e8b9
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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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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_gsvideo_h
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25 #define _SDL_gsvideo_h
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26
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27 #include <sys/types.h>
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28 #include <termios.h>
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29 #include <linux/ps2/dev.h>
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30 #include <linux/ps2/gs.h>
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31
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32 #include "SDL_mouse.h"
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33 #include "SDL_mutex.h"
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34 #include "../SDL_sysvideo.h"
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35
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36 /* Hidden "this" pointer for the video functions */
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37 #define _THIS SDL_VideoDevice *this
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40 /* Private display data */
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41 struct SDL_PrivateVideoData
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42 {
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43 /* Gotta love that simple PS2 graphics interface. :) */
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44 int console_fd;
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45 int memory_fd;
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46 struct ps2_screeninfo saved_vinfo;
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47
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48 /* Ye olde linux keyboard code */
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49 int current_vt;
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50 int saved_vt;
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51 int keyboard_fd;
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52 int saved_kbd_mode;
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53 struct termios saved_kbd_termios;
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54
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55 /* Ye olde linux mouse code */
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56 int mouse_fd;
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57 int cursor_drawn;
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58
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59 /* The memory mapped DMA area and associated variables */
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60 caddr_t mapped_mem;
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61 int pixels_len;
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62 int mapped_len;
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63 struct ps2_image screen_image;
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64 int screen_image_size;
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65 unsigned long long *head_tags_mem;
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66 unsigned long long *image_tags_mem;
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67 unsigned long long *tex_tags_mem;
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68 unsigned long long *scale_tags_mem;
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69 int dma_pending;
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70 };
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71 /* Old variable names */
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72 #define console_fd (this->hidden->console_fd)
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73 #define memory_fd (this->hidden->memory_fd)
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74 #define saved_vinfo (this->hidden->saved_vinfo)
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75 #define current_vt (this->hidden->current_vt)
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76 #define saved_vt (this->hidden->saved_vt)
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77 #define keyboard_fd (this->hidden->keyboard_fd)
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78 #define saved_kbd_mode (this->hidden->saved_kbd_mode)
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79 #define saved_kbd_termios (this->hidden->saved_kbd_termios)
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80 #define mouse_fd (this->hidden->mouse_fd)
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81 #define cursor_drawn (this->hidden->cursor_drawn)
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82 #define mapped_mem (this->hidden->mapped_mem)
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83 #define pixels_len (this->hidden->pixels_len)
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84 #define mapped_len (this->hidden->mapped_len)
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85 #define screen_image (this->hidden->screen_image)
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86 #define screen_image_size (this->hidden->screen_image_size)
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87 #define head_tags_mem (this->hidden->head_tags_mem)
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88 #define image_tags_mem (this->hidden->image_tags_mem)
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89 #define tex_tags_mem (this->hidden->tex_tags_mem)
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90 #define scale_tags_mem (this->hidden->scale_tags_mem)
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91 #define dma_pending (this->hidden->dma_pending)
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92
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93 /* Shared between the mouse and video code for screen update scaling */
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94 extern int scaleimage_nonblock(int fd,
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95 unsigned long long *tm,
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96 unsigned long long *sm);
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97 #endif /* _SDL_gsvideo_h */
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98 /* vi: set ts=4 sw=4 expandtab: */