1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef DCQUEUE_H
#define DCQUEUE_H
// Maximum size of the DCQ. The larger the DCQ, the larger frameskips
// become tolerable before initiating livelock deterrence and game
// slowdown. Other constants for controlling the frameskip/slowdown
// balance may be found in sdl_common.c near TFB_FlushGraphics.
// Livelock deterrance constants. Because the entire screen is rarely
// refreshed, we may not drop draw commands on the floor with abandon.
// Furthermore, if the main program is queuing commands at a speed
// comparable to our processing of the commands, we never finish and
// the game freezes. Thus, if the queue starts out larger than
// DCQ_FORCE_SLOWDOWN_SIZE, or DCQ_LIVELOCK_MAX commands find
// themselves being processed in one go, livelock deterrence is
// enabled, and TFB_FlushGraphics locks the DCQ until it has processed
// all entries. If batched but pending commands exceed DCQ_FORCE_BREAK_SIZE,
// a continuity break is performed. This will effectively slow down the
// game logic, a fate we seek to avoid - however, it seems to be unavoidable
// on slower machines. Even there, it's seems nonexistent outside of
// communications screens. --Michael
#ifdef DCQ_OF_DOOM
#define DCQ_MAX 512
#define DCQ_FORCE_SLOWDOWN_SIZE 128
#define DCQ_FORCE_BREAK_SIZE 512
#define DCQ_LIVELOCK_MAX 256
#else
#define DCQ_MAX 16384
#define DCQ_FORCE_SLOWDOWN_SIZE 4096
#define DCQ_FORCE_BREAK_SIZE 16384
#define DCQ_LIVELOCK_MAX 4096
#endif
extern CondVar RenderingCond;
#endif
|