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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 #ifdef SDL_TIMER_MINT |
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25 |
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26 /* |
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27 * TOS/MiNT timer driver |
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28 * based on vbl vector |
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29 * |
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30 * Patrice Mandin |
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31 */ |
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32 |
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33 #include <stdio.h> |
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34 #include <sys/time.h> |
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35 #include <signal.h> |
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36 #include <unistd.h> |
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37 #include <string.h> |
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38 #include <errno.h> |
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39 |
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40 #include <mint/cookie.h> |
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41 #include <mint/sysvars.h> |
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42 #include <mint/osbind.h> |
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43 #include <mint/mintbind.h> |
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44 |
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45 #include "SDL_timer.h" |
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46 #include "../SDL_timer_c.h" |
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47 #include "SDL_thread.h" |
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48 |
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49 #include "SDL_vbltimer_s.h" |
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50 |
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51 /* from audio/mint */ |
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52 void SDL_MintAudio_CheckFpu(void); |
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53 |
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54 /* The first ticks value of the application */ |
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55 static Uint32 start; |
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56 static SDL_bool read_hz200_from_vbl = SDL_FALSE; |
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57 static int mint_present; /* can we use Syield() ? */ |
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58 |
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59 void SDL_StartTicks(void) |
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60 { |
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61 void *old_stack; |
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62 unsigned long dummy; |
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63 |
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64 /* Set first ticks value */ |
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65 old_stack = (void *)Super(0); |
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66 start = *((volatile long *)_hz_200); |
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67 Super(old_stack); |
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68 |
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69 start *= 5; /* One _hz_200 tic is 5ms */ |
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70 |
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71 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND); |
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72 } |
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73 |
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74 Uint32 SDL_GetTicks (void) |
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75 { |
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76 Uint32 now = start; |
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77 |
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78 if (read_hz200_from_vbl) { |
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79 now = SDL_Atari_hz200; |
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80 } else { |
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81 void *old_stack = (void *)Super(0); |
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82 now = *((volatile long *)_hz_200); |
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83 Super(old_stack); |
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84 } |
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85 |
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86 return((now*5)-start); |
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87 } |
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88 |
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89 void SDL_Delay (Uint32 ms) |
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90 { |
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91 Uint32 now; |
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92 |
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93 now = SDL_GetTicks(); |
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94 while ((SDL_GetTicks()-now)<ms){ |
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95 if (mint_present) { |
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96 Syield(); |
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97 } |
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98 } |
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99 } |
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100 |
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101 /* Data to handle a single periodic alarm */ |
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102 static SDL_bool timer_installed=SDL_FALSE; |
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103 |
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104 /* This is only called if the event thread is not running */ |
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105 int SDL_SYS_TimerInit(void) |
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106 { |
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107 void *old_stack; |
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108 |
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109 SDL_MintAudio_CheckFpu(); |
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110 |
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111 /* Install RunTimer in vbl vector */ |
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112 old_stack = (void *)Super(0); |
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113 timer_installed = !SDL_AtariVblInstall(SDL_ThreadedTimerCheck); |
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114 Super(old_stack); |
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115 |
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116 if (!timer_installed) { |
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117 return(-1); |
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118 } |
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119 |
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120 read_hz200_from_vbl = SDL_TRUE; |
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121 return(SDL_SetTimerThreaded(0)); |
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122 } |
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123 |
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124 void SDL_SYS_TimerQuit(void) |
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125 { |
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126 /* Uninstall RunTimer vbl vector */ |
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127 if (timer_installed) { |
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128 void *old_stack = (void *)Super(0); |
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129 SDL_AtariVblUninstall(SDL_ThreadedTimerCheck); |
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130 Super(old_stack); |
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131 timer_installed = SDL_FALSE; |
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132 } |
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133 read_hz200_from_vbl = SDL_FALSE; |
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134 } |
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135 |
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136 int SDL_SYS_StartTimer(void) |
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137 { |
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138 SDL_SetError("Internal logic error: MiNT uses vbl timer"); |
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139 return(-1); |
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140 } |
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141 |
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142 void SDL_SYS_StopTimer(void) |
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143 { |
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144 return; |
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145 } |
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146 |
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147 #endif /* SDL_TIMER_MINT */ |