e14743d1 |
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 */ |