Mercurial > sdl-ios-xcode

annotate src/timer/mint/SDL_systimer.c @ 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
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 #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
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60 SDL_StartTicks(void)
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61 {
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62 void *oldpile;
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63 unsigned long dummy;
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64
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65 /* Set first ticks value */
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66 oldpile = (void *) Super(0);
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67 start = *((volatile long *) _hz_200);
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68 Super(oldpile);
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69
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70 start *= 5; /* One _hz_200 tic is 5ms */
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71
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72 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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73 }
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74
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75 Uint32
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76 SDL_GetTicks(void)
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77 {
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78 Uint32 now = start;
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79
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80 if (read_hz200_from_vbl) {
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81 now = SDL_Atari_hz200;
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82 } else {
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83 void *old_stack = (void *) Super(0);
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84 now = *((volatile long *) _hz_200);
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85 Super(old_stack);
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86 }
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87
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88 return ((now * 5) - start);
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89 }
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90
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91 void
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92 SDL_Delay(Uint32 ms)
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93 {
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94 Uint32 now;
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95
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96 now = SDL_GetTicks();
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97 while ((SDL_GetTicks() - now) < ms) {
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98 if (mint_present) {
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99 Syield();
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100 }
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101 }
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102 }
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103
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104 /* Data to handle a single periodic alarm */
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105 static SDL_bool timer_installed = SDL_FALSE;
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106
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107 /* This is only called if the event thread is not running */
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108 int
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109 SDL_SYS_TimerInit(void)
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110 {
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111 void *old_stack;
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112
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113 SDL_MintAudio_CheckFpu();
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114
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115 /* Install RunTimer in vbl vector */
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116 old_stack = (void *) Super(0);
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117 timer_installed = !SDL_AtariVblInstall(SDL_ThreadedTimerCheck);
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118 Super(old_stack);
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119
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120 if (!timer_installed) {
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121 return (-1);
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122 }
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123
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124 read_hz200_from_vbl = SDL_TRUE;
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125 return (SDL_SetTimerThreaded(0));
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126 }
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127
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128 void
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129 SDL_SYS_TimerQuit(void)
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130 {
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131 if (timer_installed) {
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132 /* Uninstall RunTimer vbl vector */
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133 void *old_stack = (void *) Super(0);
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134 SDL_AtariVblUninstall(SDL_ThreadedTimerCheck);
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135 Super(old_stack);
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136 timer_installed = SDL_FALSE;
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137 }
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138 read_hz200_from_vbl = SDL_FALSE;
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139 }
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140
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141 int
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142 SDL_SYS_StartTimer(void)
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143 {
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144 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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145 return (-1);
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146 }
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147
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148 void
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149 SDL_SYS_StopTimer(void)
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150 {
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151 return;
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152 }
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153
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parents: 1402
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154 #endif /* SDL_TIMER_MINT */
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155 /* vi: set ts=4 sw=4 expandtab: */