Mercurial > sdl-ios-xcode

annotate src/joystick/amigaos/SDL_sysjoystick.c @ 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
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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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 #ifdef SDL_JOYSTICK_AMIGA
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25
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26 /* This is the system specific header for the SDL joystick API */
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27
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28 #include <libraries/lowlevel.h>
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29 #if defined(__SASC) || defined(STORMC4_WOS)
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30 #include <proto/exec.h>
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31 #include <proto/lowlevel.h>
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32 #include <proto/graphics.h>
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33 #else
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34 #include <inline/exec.h>
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35 #include <inline/lowlevel.h>
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36 #include <inline/graphics.h>
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37 #endif
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38 #include "mydebug.h"
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39
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40 extern struct ExecBase *SysBase;
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41 extern struct GfxBase *GfxBase;
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42
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43 #include "SDL_joystick.h"
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44 #include "../SDL_sysjoystick.h"
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45 #include "../SDL_joystick_c.h"
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46
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47 /* Function to scan the system for joysticks.
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48 * This function should set SDL_numjoysticks to the number of available
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49 * joysticks. Joystick 0 should be the system default joystick.
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50 * It should return 0, or -1 on an unrecoverable fatal error.
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51 */
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52
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53
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54 /* Amiga specific datas */
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55 struct Library *LowLevelBase = NULL;
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56
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57 ULONG joybut[] = {
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58 JPF_BUTTON_RED,
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59 JPF_BUTTON_BLUE,
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60 JPF_BUTTON_PLAY,
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61 JPF_BUTTON_YELLOW,
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62 JPF_BUTTON_GREEN,
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63 JPF_BUTTON_FORWARD,
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64 JPF_BUTTON_REVERSE,
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65 };
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66
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67 struct joystick_hwdata
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68 {
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69 ULONG joystate;
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70 };
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71
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72 int
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73 SDL_SYS_JoystickInit(void)
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74 {
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75 if (!LowLevelBase) {
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76 if (LowLevelBase = OpenLibrary("lowlevel.library", 37))
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77 return 2;
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78 } else
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79 return 2;
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80
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81 D(bug("%ld joysticks available.\n", SDL_numjoysticks));
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82
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83 return 0;
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84 }
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85
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86 /* Function to get the device-dependent name of a joystick */
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87 const char *
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88 SDL_SYS_JoystickName(int index)
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89 {
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90 if (index < 2 && LowLevelBase) {
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91 switch (index) {
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92 case 0:
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93 return "Port 1 Amiga Joystick/Joypad";
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94 case 1:
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95 return "Port 2 Amiga Joystick/Joypad";
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96 }
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97 }
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98
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99 SDL_SetError("No joystick available with that index");
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100 return (NULL);
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101 }
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102
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103 /* Function to open a joystick for use.
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104 The joystick to open is specified by the index field of the joystick.
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105 This should fill the nbuttons and naxes fields of the joystick structure.
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106 It returns 0, or -1 if there is an error.
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107 */
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108
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109 int
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110 SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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111 {
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112 ULONG temp, i;
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113 D(bug("Opening joystick %ld\n", joystick->index));
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114
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115 if (!(joystick->hwdata = SDL_malloc(sizeof(struct joystick_hwdata))))
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116 return -1;
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117
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118 /* This loop is to check if the controller is a joypad */
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119
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120 for (i = 0; i < 20; i++) {
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121 temp = ReadJoyPort(joystick->index ^ 1); // fix to invert amiga joyports
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122 WaitTOF();
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123 }
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124
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125 if ((temp & JP_TYPE_MASK) == JP_TYPE_GAMECTLR)
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126 joystick->nbuttons = 7;
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127 else
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128 joystick->nbuttons = 3;
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129
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130 joystick->nhats = 0;
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131 joystick->nballs = 0;
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132 joystick->naxes = 2;
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133 joystick->hwdata->joystate = 0L;
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134
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135 return 0;
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136 }
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137
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138 /* Function to update the state of a joystick - called as a device poll.
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139 * This function shouldn't update the joystick structure directly,
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140 * but instead should call SDL_PrivateJoystick*() to deliver events
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141 * and update joystick device state.
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142 */
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143 void
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144 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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145 {
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146 ULONG data;
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147 int i;
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148
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149 if (joystick->index < 2) {
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150 data = ReadJoyPort(joystick->index);
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151
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152 if (data & JP_DIRECTION_MASK) {
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153 if (data & JPF_JOY_DOWN) {
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154 if (!(joystick->hwdata->joystate & JPF_JOY_DOWN))
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155 SDL_PrivateJoystickAxis(joystick, 0, 127);
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156 } else if (data & JPF_JOY_UP) {
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157 if (!(joystick->hwdata->joystate & JPF_JOY_UP))
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158 SDL_PrivateJoystickAxis(joystick, 0, -127);
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159 } else if (joystick->hwdata->
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160 joystate & (JPF_JOY_UP | JPF_JOY_DOWN))
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161 SDL_PrivateJoystickAxis(joystick, 0, 0);
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162
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163 if (data & JPF_JOY_LEFT) {
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164 if (!(joystick->hwdata->joystate & JPF_JOY_LEFT))
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165 SDL_PrivateJoystickAxis(joystick, 1, -127);
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166 } else if (data & JPF_JOY_RIGHT) {
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167 if (!(joystick->hwdata->joystate & JPF_JOY_RIGHT))
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168 SDL_PrivateJoystickAxis(joystick, 1, 127);
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169 } else if (joystick->hwdata->
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170 joystate & (JPF_JOY_LEFT | JPF_JOY_RIGHT))
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171 SDL_PrivateJoystickAxis(joystick, 1, 0);
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172 } else if (joystick->hwdata->
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173 joystate & (JPF_JOY_LEFT | JPF_JOY_RIGHT)) {
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174 SDL_PrivateJoystickAxis(joystick, 1, 0);
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175 } else if (joystick->hwdata->joystate & (JPF_JOY_UP | JPF_JOY_DOWN)) {
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176 SDL_PrivateJoystickAxis(joystick, 0, 0);
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177 }
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178
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179 for (i = 0; i < joystick->nbuttons; i++) {
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180 if ((data & joybut[i])) {
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181 if (i == 1)
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182 data &= (~(joybut[2]));
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183
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184 if (!(joystick->hwdata->joystate & joybut[i]))
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185 SDL_PrivateJoystickButton(joystick, i, SDL_PRESSED);
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186 } else if (joystick->hwdata->joystate & joybut[i])
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187 SDL_PrivateJoystickButton(joystick, i, SDL_RELEASED);
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188 }
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189
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190 joystick->hwdata->joystate = data;
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191 }
21
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192
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193 return;
21
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194 }
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195
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196 /* Function to close a joystick after use */
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197 void
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198 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
21
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199 {
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200 if (joystick->hwdata)
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201 SDL_free(joystick->hwdata);
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202 return;
21
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203 }
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204
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205 /* Function to perform any system-specific joystick related cleanup */
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206
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207 void
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208 SDL_SYS_JoystickQuit(void)
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209 {
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210 if (LowLevelBase) {
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211 CloseLibrary(LowLevelBase);
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212 LowLevelBase = NULL;
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213 SDL_numjoysticks = 0;
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214 }
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215 return;
21
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216 }
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217
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218 #endif /* SDL_JOYSTICK_AMIGA */
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219 /* vi: set ts=4 sw=4 expandtab: */