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annotate src/timer/mint/SDL_vbltimer.S @ 2960:91708bc14aab

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It's probably not worth pushing palettized textures. The memory optimization isn't worth the effort on modern hardware with the sorts of games that would be using the SDL 1.3 texture API.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 02 Jan 2009 09:27:36 +0000
parents 99210400e8b9
children 5425a6fbacf8
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 * VBL queue routine
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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 #define _vbl_queue 0x456
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30 #define _hz_200 0x4ba
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31
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32 .text
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33
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34 .globl _SDL_AtariVblInstall
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35 .globl _SDL_AtariVblUninstall
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36
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37 .globl _SDL_MintAudio_hasfpu
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38
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39 /*--- Vector installer ---*/
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40
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41 _SDL_AtariVblInstall:
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42 movel sp@(4),my_vector
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43 lea _my_vbl,a0
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44
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45 clrw vbl_mutex
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46 movel _hz_200.w, _SDL_Atari_hz200
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47
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48 /* Stop interrupts */
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49
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50 movew #0x2700,sr
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51
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52 /* Read vbl_queue pointer */
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53 movel _vbl_queue.w,a1
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54
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55 /* Search a free place */
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56 moveq #7,d0
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57 bcl_search_place:
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58 movel (a1),d1
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59 beqs place_found
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60 addql #4,a1
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61 dbra d0,bcl_search_place
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62
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63 /* Not found */
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64 moveq #1,d0
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65 bras exit_vbl_queue
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66
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67 /* Then install ourselves */
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68 place_found:
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69 movel a0,(a1)
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70 moveq #0,d0
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71
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72 exit_vbl_queue:
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73 /* Restart interrupts */
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74 movew #0x2300,sr
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75
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76 rts
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77
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78 /*--- Vector uninstaller ---*/
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79
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80 _SDL_AtariVblUninstall:
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81 movel sp@(4),d0
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82 cmpl my_vector,d0
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83 bnes badvector
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84
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85 movel #_my_vbl,d0
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86
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87 /* Stop interrupts */
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88
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89 movew #0x2700,sr
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90
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91 /* Read vbl_queue pointer */
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92 movel _vbl_queue.w,a1
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93
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94 /* Search where we are */
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95 moveq #7,d1
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96 bcl2_search_place:
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97 cmpl (a1),d0
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98 bnes next_place
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99 clrl (a1)
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100 moveq #0,d1
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101 next_place:
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102 addql #4,a1
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103 dbra d1,bcl2_search_place
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104
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105 /* Restart interrupts */
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106 movew #0x2300,sr
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107 badvector:
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108 rts
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109
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110 /*--- Our vbl ---*/
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111
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112 _my_vbl:
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113 /* Update _hz_200 */
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114 movel _hz_200.w, _SDL_Atari_hz200
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115
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116 /* Verify if this is not already running */
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117
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118 tstw vbl_mutex
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119 bnes vbl_end
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120 notw vbl_mutex
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121
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122 moveml d0-d7/a0-a6,sp@-
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123
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124 /* Save FPU if needed */
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125 tstw _SDL_MintAudio_hasfpu
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126 beqs SDL_AtariVbl_nofpu1
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127 .chip 68060
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128 fsave sp@-
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129 fmoveml fpcr/fpsr/fpiar,sp@-
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130 fmovemx fp0-fp7,sp@-
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131 .chip 68000
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132 SDL_AtariVbl_nofpu1:
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133
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134 movel my_vector,a0
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135 jsr a0@
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136
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137 /* Restore FPU if needed */
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138 tstw _SDL_MintAudio_hasfpu
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139 beqs SDL_AtariVbl_Xbios_nofpu2
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140 .chip 68060
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141 fmovemx sp@+,fp0-fp7
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142 fmoveml sp@+,fpcr/fpsr/fpiar
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143 frestore sp@+
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144 .chip 68000
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145 SDL_AtariVbl_Xbios_nofpu2:
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146
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147 moveml sp@+,d0-d7/a0-a6
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148
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149 clrw vbl_mutex
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150 vbl_end:
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151 rts
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152
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153 .data
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154 .even
2116
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155 .comm _SDL_Atari_hz200,4*1
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156 .even
281
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157 .comm vbl_mutex,2*1
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158 .even
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159 .comm my_vector,4*1