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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 |
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23 /* |
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24 * XBIOS mouse & joystick vectors |
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25 * |
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26 * Patrice Mandin |
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27 */ |
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28 |
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29 .text |
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30 |
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31 .globl _SDL_AtariXbios_Install |
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32 .globl _SDL_AtariXbios_Restore |
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33 .globl _SDL_AtariXbios_MouseVector |
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34 .globl _SDL_AtariXbios_JoystickVector |
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35 |
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36 .globl _SDL_AtariXbios_mouselock |
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37 .globl _SDL_AtariXbios_mouseb |
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38 .globl _SDL_AtariXbios_mousex |
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39 .globl _SDL_AtariXbios_mousey |
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40 .globl _SDL_AtariXbios_joystick |
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41 |
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42 /*--- Vector installer ---*/ |
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43 |
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44 _SDL_AtariXbios_Install: |
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45 movel sp@(4),a0 |
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46 |
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47 /* Stop interrupts */ |
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48 |
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49 movew #0x2700,sr |
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50 |
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51 /* Save old mouse vector, set our routine */ |
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52 |
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53 clrl oldmousevector |
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54 movel sp@(8),d0 |
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55 beqs no_new_mouse_vector |
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56 movel a0@(16),oldmousevector |
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57 movel d0,a0@(16) |
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58 no_new_mouse_vector: |
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59 |
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60 /* Save old joystick vector, set our routine */ |
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61 |
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62 clrl oldjoystickvector |
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63 movel sp@(12),d0 |
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64 beqs no_new_joystick_vector |
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65 movel a0@(24),oldjoystickvector |
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66 movel d0,a0@(24) |
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67 no_new_joystick_vector: |
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68 |
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69 /* Restart interrupts */ |
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70 |
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71 movew #0x2300,sr |
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72 |
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73 rts |
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74 |
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75 /*--- Vector restorer ---*/ |
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76 |
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77 _SDL_AtariXbios_Restore: |
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78 movel sp@(4),a0 |
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79 |
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80 /* Stop interrupts */ |
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81 |
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82 movew #0x2700,sr |
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83 |
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84 /* Restore mouse vector */ |
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85 |
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86 movel oldmousevector,d0 |
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87 beqs no_restore_mouse |
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88 movel d0,a0@(16) |
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89 no_restore_mouse: |
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90 |
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91 /* Restore joystick vector */ |
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92 |
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93 movel oldjoystickvector,d0 |
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94 beqs no_restore_joystick |
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95 movel d0,a0@(24) |
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96 no_restore_joystick: |
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97 |
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98 /* Restart interrupts */ |
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99 |
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100 movew #0x2300,sr |
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101 |
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102 rts |
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103 |
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104 /*--- Our mouse vector ---*/ |
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105 |
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106 .text |
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107 .even |
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108 .ascii "XBRA" |
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109 .ascii "LSDL" |
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110 .comm oldmousevector,4*1 |
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111 _SDL_AtariXbios_MouseVector: |
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112 movel d0,sp@- |
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113 |
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114 /* Mouse buttons */ |
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115 moveb (a0),d0 |
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116 andw #3,d0 |
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117 movew d0,_SDL_AtariXbios_mouseb |
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118 |
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119 /* X movement */ |
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120 moveb a0@(1),d0 |
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121 extw d0 |
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122 addw d0,_SDL_AtariXbios_mousex |
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123 |
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124 /* Y movement */ |
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125 moveb a0@(2),d0 |
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126 extw d0 |
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127 addw d0,_SDL_AtariXbios_mousey |
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128 |
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129 /* Lock mouse position ? */ |
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130 tstw _SDL_AtariXbios_mouselock |
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131 beq.s no_mouse_lock |
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132 clrb a0@(1) |
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133 clrb a0@(2) |
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134 no_mouse_lock: |
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135 |
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136 /* Jump through old vector */ |
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137 movel sp@+,d0 |
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138 |
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139 movel oldmousevector,sp@- |
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140 rts |
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141 |
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142 .data |
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143 .even |
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144 .comm _SDL_AtariXbios_mouselock,2*1 |
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145 .comm _SDL_AtariXbios_mousex,2*1 |
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146 .comm _SDL_AtariXbios_mousey,2*1 |
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147 .comm _SDL_AtariXbios_mouseb,2*1 |
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148 |
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149 /*--- Our joystick vector ---*/ |
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150 |
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151 .text |
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152 .even |
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153 .ascii "XBRA" |
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154 .ascii "LSDL" |
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155 .comm oldjoystickvector,4*1 |
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156 _SDL_AtariXbios_JoystickVector: |
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157 movel d0,sp@- |
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158 |
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159 /* New joystick state */ |
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160 moveb a0@(2),d0 |
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161 andw #0x8f,d0 |
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162 movew d0,_SDL_AtariXbios_joystick |
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163 |
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164 /* Jump through old vector */ |
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165 movel sp@+,d0 |
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166 |
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167 movel oldjoystickvector,sp@- |
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168 rts |
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169 |
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170 .data |
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171 .even |
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172 .comm _SDL_AtariXbios_joystick,2*1 |