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author paulo@localhost
date Fri, 13 Mar 2009 00:39:12 -0700
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1 /* Basic data types for LOCKJAW, an implementation of the Soviet Mind Game
2
3 Copyright (C) 2006 Damian Yerrick <tepples+lj@spamcop.net>
4
5 This work is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program 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
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Original game concept and design by Alexey Pajitnov.
20 The Software is not sponsored or endorsed by Alexey Pajitnov, Elorg,
21 or The Tetris Company LLC.
22
23 */
24
25 #ifndef LJTYPES_H
26 #define LJTYPES_H
27
28 /**
29 * A 16.16 signed number. Used commonly for Y piece positions.
30 */
31 typedef signed int LJFixed;
32
33 static inline signed int ljfixfloor(LJFixed f) __attribute__((const));
34
35 static inline signed int ljfixfloor(LJFixed f) {
36 return f >> 16;
37 }
38
39 static inline LJFixed ljitofix(signed int f) __attribute__((const));
40
41 static inline LJFixed ljitofix(signed int f) {
42 return f << 16;
43 }
44
45 /*
46 * In most cases, macros are deprecated in favor of static inline functions
47 * because the latter allow the compiler to perform more type checks.
48 * However, the C language forbids calling a function in an inline
49 * constructor, even if it is a static inline function with no side effects.
50 * For example, GCC gives the misleading error message
51 * "error: initializer element is not constant".
52 * Therefore, I have to provide a second implementation of ljitofix()
53 * as a macro for use in global variable initializers.
54 */
55 #define LJITOFIX(f) ((LJFixed)((f) << 16))
56
57
58 typedef unsigned int LJBits;
59
60 #endif
61