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annotate src/joystick/dc/SDL_sysjoystick.c @ 1554:0ca607a5d173

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Fixed bug #84 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:04:40 +0000
parents 11134dc42da8
children 92947e3a18db
rev   line source
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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 #include "SDL_events.h"
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25 #include "SDL_joystick.h"
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26 #include "../SDL_sysjoystick.h"
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27 #include "../SDL_joystick_c.h"
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28
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29 #include <dc/maple.h>
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30 #include <dc/maple/controller.h>
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31
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32 #define MAX_JOYSTICKS 8 /* only 2 are supported in the multimedia API */
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33 #define MAX_AXES 6 /* each joystick can have up to 6 axes */
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34 #define MAX_BUTTONS 8 /* and 8 buttons */
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35 #define MAX_HATS 2
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36
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37 #define JOYNAMELEN 8
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38
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39 /* array to hold joystick ID values */
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40 static uint8 SYS_Joystick_addr[MAX_JOYSTICKS];
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41
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42 /* The private structure used to keep track of a joystick */
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43 struct joystick_hwdata
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44 {
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45 cont_cond_t prev_cond;
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46 int prev_buttons;
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47 };
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48
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49 /* Function to scan the system for joysticks.
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50 * This function should set SDL_numjoysticks to the number of available
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51 * joysticks. Joystick 0 should be the system default joystick.
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52 * It should return 0, or -1 on an unrecoverable fatal error.
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53 */
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54 int SDL_SYS_JoystickInit(void)
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55 {
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56 int numdevs;
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57
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58 int p,u;
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59
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60 numdevs = 0;
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61 for(p=0;p<MAPLE_PORT_COUNT;p++) {
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62 for(u=0;u<MAPLE_UNIT_COUNT;u++) {
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63 if (maple_device_func(p,u)&MAPLE_FUNC_CONTROLLER) {
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64 SYS_Joystick_addr[numdevs] = maple_addr(p,u);
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65 numdevs++;
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66 }
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67 }
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68 }
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69
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70 return(numdevs);
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71 }
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72
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73 /* Function to get the device-dependent name of a joystick */
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74 const char *SDL_SYS_JoystickName(int index)
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75 {
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76 maple_device_t *dev;
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77 if (maple_compat_resolve(SYS_Joystick_addr[index],&dev,MAPLE_FUNC_CONTROLLER)!=0) return NULL;
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78 return dev->info.product_name;
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79 }
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80
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81 /* Function to open a joystick for use.
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82 The joystick to open is specified by the index field of the joystick.
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83 This should fill the nbuttons and naxes fields of the joystick structure.
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84 It returns 0, or -1 if there is an error.
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85 */
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86 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
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87 {
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88 /* allocate memory for system specific hardware data */
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89 joystick->hwdata = (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
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90 if (joystick->hwdata == NULL)
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91 {
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92 SDL_OutOfMemory();
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93 return(-1);
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94 }
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95 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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96
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97 /* fill nbuttons, naxes, and nhats fields */
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98 joystick->nbuttons = MAX_BUTTONS;
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99 joystick->naxes = MAX_AXES;
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100 joystick->nhats = MAX_HATS;
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101 return(0);
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102 }
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103
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104
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105 /* Function to update the state of a joystick - called as a device poll.
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106 * This function shouldn't update the joystick structure directly,
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107 * but instead should call SDL_PrivateJoystick*() to deliver events
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108 * and update joystick device state.
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109 */
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110
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111 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
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112 {
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113 const int sdl_buttons[] = {
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114 CONT_C,
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115 CONT_B,
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116 CONT_A,
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117 CONT_START,
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118 CONT_Z,
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119 CONT_Y,
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120 CONT_X,
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121 CONT_D
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122 };
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123
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124 uint8 addr;
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125 cont_cond_t cond,*prev_cond;
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126 int buttons,prev_buttons,i,changed;
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127
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128 addr = SYS_Joystick_addr[joystick->index];
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129 if (cont_get_cond(addr,&cond)<0) return;
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130
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131 buttons = cond.buttons;
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132 prev_buttons = joystick->hwdata->prev_buttons;
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133 changed = buttons^prev_buttons;
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134
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135 if ((changed)&(CONT_DPAD_UP|CONT_DPAD_DOWN|CONT_DPAD_LEFT|CONT_DPAD_RIGHT)) {
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136 int hat = SDL_HAT_CENTERED;
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137 if (buttons&CONT_DPAD_UP) hat|=SDL_HAT_UP;
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138 if (buttons&CONT_DPAD_DOWN) hat|=SDL_HAT_DOWN;
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139 if (buttons&CONT_DPAD_LEFT) hat|=SDL_HAT_LEFT;
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140 if (buttons&CONT_DPAD_RIGHT) hat|=SDL_HAT_RIGHT;
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141 SDL_PrivateJoystickHat(joystick, 0, hat);
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142 }
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143 if ((changed)&(CONT_DPAD2_UP|CONT_DPAD2_DOWN|CONT_DPAD2_LEFT|CONT_DPAD2_RIGHT)) {
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144 int hat = SDL_HAT_CENTERED;
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145 if (buttons&CONT_DPAD2_UP) hat|=SDL_HAT_UP;
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146 if (buttons&CONT_DPAD2_DOWN) hat|=SDL_HAT_DOWN;
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147 if (buttons&CONT_DPAD2_LEFT) hat|=SDL_HAT_LEFT;
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148 if (buttons&CONT_DPAD2_RIGHT) hat|=SDL_HAT_RIGHT;
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149 SDL_PrivateJoystickHat(joystick, 1, hat);
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150 }
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151
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152 for(i=0;i<sizeof(sdl_buttons)/sizeof(sdl_buttons[0]);i++) {
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153 if (changed & sdl_buttons[i]) {
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154 SDL_PrivateJoystickButton(joystick, i, (buttons & sdl_buttons[i])?SDL_PRESSED:SDL_RELEASED);
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155 }
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156 }
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157
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158 prev_cond = &joystick->hwdata->prev_cond;
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159 if (cond.joyx!=prev_cond->joyx)
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160 SDL_PrivateJoystickAxis(joystick, 0, cond.joyx-128);
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161 if (cond.joyy!=prev_cond->joyy)
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162 SDL_PrivateJoystickAxis(joystick, 1, cond.joyy-128);
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163 if (cond.rtrig!=prev_cond->rtrig)
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164 SDL_PrivateJoystickAxis(joystick, 2, cond.rtrig);
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165 if (cond.ltrig!=prev_cond->ltrig)
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166 SDL_PrivateJoystickAxis(joystick, 3, cond.ltrig);
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167 if (cond.joy2x!=prev_cond->joy2x)
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168 SDL_PrivateJoystickAxis(joystick, 4, cond.joy2x-128);
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169 if (cond.joy2y!=prev_cond->joy2y)
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170 SDL_PrivateJoystickAxis(joystick, 5, cond.joy2y-128);
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171
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172 joystick->hwdata->prev_buttons = buttons;
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173 joystick->hwdata->prev_cond = cond;
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174 }
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175
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176 /* Function to close a joystick after use */
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177 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
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178 {
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179 if (joystick->hwdata != NULL) {
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180 /* free system specific hardware data */
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181 SDL_free(joystick->hwdata);
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182 }
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183 }
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184
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185 /* Function to perform any system-specific joystick related cleanup */
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186 void SDL_SYS_JoystickQuit(void)
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187 {
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188 return;
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189 }