| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #ifdef SDL_TIMER_MINT |
| 25 | |
| 26 | /* |
| 27 | * TOS/MiNT timer driver |
| 28 | * based on vbl vector |
| 29 | * |
| 30 | * Patrice Mandin |
| 31 | */ |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | #include <sys/time.h> |
| 35 | #include <signal.h> |
| 36 | #include <unistd.h> |
| 37 | #include <string.h> |
| 38 | #include <errno.h> |
| 39 | |
| 40 | #include <mint/cookie.h> |
| 41 | #include <mint/sysvars.h> |
| 42 | #include <mint/osbind.h> |
| 43 | #include <mint/mintbind.h> |
| 44 | |
| 45 | #include "SDL_timer.h" |
| 46 | #include "../SDL_timer_c.h" |
| 47 | #include "SDL_thread.h" |
| 48 | |
| 49 | #include "SDL_vbltimer_s.h" |
| 50 | |
| 51 | /* from audio/mint */ |
| 52 | void SDL_MintAudio_CheckFpu(void); |
| 53 | |
| 54 | /* The first ticks value of the application */ |
| 55 | static Uint32 start; |
| 56 | static SDL_bool read_hz200_from_vbl = SDL_FALSE; |
| 57 | static int mint_present; /* can we use Syield() ? */ |
| 58 | |
| 59 | void SDL_StartTicks(void) |
| 60 | { |
| 61 | void *old_stack; |
| 62 | unsigned long dummy; |
| 63 | |
| 64 | /* Set first ticks value */ |
| 65 | old_stack = (void *)Super(0); |
| 66 | start = *((volatile long *)_hz_200); |
| 67 | Super(old_stack); |
| 68 | |
| 69 | start *= 5; /* One _hz_200 tic is 5ms */ |
| 70 | |
| 71 | mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND); |
| 72 | } |
| 73 | |
| 74 | Uint32 SDL_GetTicks (void) |
| 75 | { |
| 76 | Uint32 now = start; |
| 77 | |
| 78 | if (read_hz200_from_vbl) { |
| 79 | now = SDL_Atari_hz200; |
| 80 | } else { |
| 81 | void *old_stack = (void *)Super(0); |
| 82 | now = *((volatile long *)_hz_200); |
| 83 | Super(old_stack); |
| 84 | } |
| 85 | |
| 86 | return((now*5)-start); |
| 87 | } |
| 88 | |
| 89 | void SDL_Delay (Uint32 ms) |
| 90 | { |
| 91 | Uint32 now; |
| 92 | |
| 93 | now = SDL_GetTicks(); |
| 94 | while ((SDL_GetTicks()-now)<ms){ |
| 95 | if (mint_present) { |
| 96 | Syield(); |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | /* Data to handle a single periodic alarm */ |
| 102 | static SDL_bool timer_installed=SDL_FALSE; |
| 103 | |
| 104 | /* This is only called if the event thread is not running */ |
| 105 | int SDL_SYS_TimerInit(void) |
| 106 | { |
| 107 | void *old_stack; |
| 108 | |
| 109 | SDL_MintAudio_CheckFpu(); |
| 110 | |
| 111 | /* Install RunTimer in vbl vector */ |
| 112 | old_stack = (void *)Super(0); |
| 113 | timer_installed = !SDL_AtariVblInstall(SDL_ThreadedTimerCheck); |
| 114 | Super(old_stack); |
| 115 | |
| 116 | if (!timer_installed) { |
| 117 | return(-1); |
| 118 | } |
| 119 | |
| 120 | read_hz200_from_vbl = SDL_TRUE; |
| 121 | return(SDL_SetTimerThreaded(0)); |
| 122 | } |
| 123 | |
| 124 | void SDL_SYS_TimerQuit(void) |
| 125 | { |
| 126 | /* Uninstall RunTimer vbl vector */ |
| 127 | if (timer_installed) { |
| 128 | void *old_stack = (void *)Super(0); |
| 129 | SDL_AtariVblUninstall(SDL_ThreadedTimerCheck); |
| 130 | Super(old_stack); |
| 131 | timer_installed = SDL_FALSE; |
| 132 | } |
| 133 | read_hz200_from_vbl = SDL_FALSE; |
| 134 | } |
| 135 | |
| 136 | int SDL_SYS_StartTimer(void) |
| 137 | { |
| 138 | SDL_SetError("Internal logic error: MiNT uses vbl timer"); |
| 139 | return(-1); |
| 140 | } |
| 141 | |
| 142 | void SDL_SYS_StopTimer(void) |
| 143 | { |
| 144 | return; |
| 145 | } |
| 146 | |
| 147 | #endif /* SDL_TIMER_MINT */ |