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annotate src/joystick/riscos/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 d74ecb53b67a
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 /*
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25 RISC OS - Joystick support by Alan Buckley (alan_baa@hotmail.com) - 10 April 2003
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26
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27 Note: Currently assumes joystick is present if joystick module is loaded
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28 and that there is one joystick with four buttons.
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29 */
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30
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31 /* This is the system specific header for the SDL joystick API */
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32
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33 #include "SDL_events.h"
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34 #include "SDL_joystick.h"
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35 #include "../SDL_sysjoystick.h"
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36 #include "../SDL_joystick_c.h"
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37
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38 #include "kernel.h"
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39
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40 #define JOYSTICK_READ 0x43F40
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41
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42 struct joystick_hwdata
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43 {
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44 int joystate;
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45 };
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46
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47
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48 /* Function to scan the system for joysticks.
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49 * This function should set SDL_numjoysticks to the number of available
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50 * joysticks. Joystick 0 should be the system default joystick.
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51 * It should return number of joysticks, or -1 on an unrecoverable fatal error.
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52 */
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53 int SDL_SYS_JoystickInit(void)
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54 {
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55 _kernel_swi_regs regs;
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56
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57 /* Try to read joystick 0 */
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58 regs.r[0] = 0;
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59 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL)
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60 {
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61 /* Switch works so assume we've got a joystick */
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62 return 1;
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63 }
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64 /* Switch fails so it looks like there's no joystick here */
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65
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66 return(0);
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67 }
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68
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69 /* Function to get the device-dependent name of a joystick */
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70 const char *SDL_SYS_JoystickName(int index)
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71 {
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72 if (index == 0)
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73 {
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74 return "RISC OS Joystick 0";
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75 }
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76
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77 SDL_SetError("No joystick available with that index");
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78 return(NULL);
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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 _kernel_swi_regs regs;
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89
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90 if(!(joystick->hwdata=SDL_malloc(sizeof(struct joystick_hwdata))))
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91 return -1;
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92
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93 regs.r[0] = joystick->index;
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94
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95 /* Don't know how to get exact count of buttons so assume max of 4 for now */
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96 joystick->nbuttons=4;
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97
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98 joystick->nhats=0;
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99 joystick->nballs=0;
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100 joystick->naxes=2;
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101 joystick->hwdata->joystate=0;
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102
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103 return 0;
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104
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105 }
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106
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107 /* Function to update the state of a joystick - called as a device poll.
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108 * This function shouldn't update the joystick structure directly,
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109 * but instead should call SDL_PrivateJoystick*() to deliver events
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110 * and update joystick device state.
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111 */
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112 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
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113 {
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114 _kernel_swi_regs regs;
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115 regs.r[0] = joystick->index;
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116
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117 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL)
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118 {
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119 int newstate = regs.r[0];
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120 int oldstate = joystick->hwdata->joystate;
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121 if (newstate != oldstate)
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122 {
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123 if ((newstate & 0xFF) != (oldstate & 0xFF))
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124 {
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125 int y = regs.r[0] & 0xFF;
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126 /* Convert to signed values */
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127 if (y >= 128) y -= 256;
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128 SDL_PrivateJoystickAxis(joystick,1,-y * 256); /* Up and down opposite to result in SDL */
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129 }
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130 if ((newstate & 0xFF00) != (oldstate & 0xFF00))
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131 {
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132 int x = (regs.r[0] & 0xFF00) >> 8;
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133 if (x >= 128) x -= 256;
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134 SDL_PrivateJoystickAxis(joystick,0,x * 256);
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135 }
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136
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137 if ((newstate & 0xFF0000) != (oldstate & 0xFF0000))
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138 {
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139 int buttons = (regs.r[0] & 0xFF0000) >> 16;
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140 int oldbuttons = (oldstate & 0xFF0000) >> 16;
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141 int i;
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142 for (i = 0; i < joystick->nbuttons; i++)
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143 {
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144 if ((buttons & (1<<i)) != (oldbuttons & (1<<i)))
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145 {
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146 if (buttons & (1<<i)) SDL_PrivateJoystickButton(joystick,i,SDL_PRESSED);
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147 else SDL_PrivateJoystickButton(joystick,i,SDL_RELEASED);
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148 }
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149 }
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150 }
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151 joystick->hwdata->joystate = newstate;
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152 }
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153 }
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154
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155 return;
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156 }
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157
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158 /* Function to close a joystick after use */
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159 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
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160 {
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161 if(joystick->hwdata)
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162 SDL_free(joystick->hwdata);
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163 return;
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164 }
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165
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166 /* Function to perform any system-specific joystick related cleanup */
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167 void SDL_SYS_JoystickQuit(void)
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168 {
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169 SDL_numjoysticks=0;
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170
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171 return;
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172 }
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173