paulo@0: /* Basic data types for LOCKJAW, an implementation of the Soviet Mind Game
paulo@0: 
paulo@0: Copyright (C) 2006 Damian Yerrick <tepples+lj@spamcop.net>
paulo@0: 
paulo@0: This work is free software; you can redistribute it and/or modify
paulo@0: it under the terms of the GNU General Public License as published by
paulo@0: the Free Software Foundation; either version 2 of the License, or
paulo@0: (at your option) any later version.
paulo@0: 
paulo@0: This program is distributed in the hope that it will be useful,
paulo@0: but WITHOUT ANY WARRANTY; without even the implied warranty of
paulo@0: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
paulo@0: GNU General Public License for more details.
paulo@0: 
paulo@0: You should have received a copy of the GNU General Public License
paulo@0: along with this program; if not, write to the Free Software
paulo@0: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
paulo@0: 
paulo@0: Original game concept and design by Alexey Pajitnov.
paulo@0: The Software is not sponsored or endorsed by Alexey Pajitnov, Elorg,
paulo@0: or The Tetris Company LLC.
paulo@0: 
paulo@0: */
paulo@0: 
paulo@0: #ifndef LJTYPES_H
paulo@0: #define LJTYPES_H
paulo@0: 
paulo@0: /**
paulo@0:  * A 16.16 signed number. Used commonly for Y piece positions.
paulo@0:  */
paulo@0: typedef signed int LJFixed;
paulo@0: 
paulo@0: static inline signed int ljfixfloor(LJFixed f) __attribute__((const)); 
paulo@0: 
paulo@0: static inline signed int ljfixfloor(LJFixed f) {
paulo@0:   return f >> 16;
paulo@0: }
paulo@0: 
paulo@0: static inline LJFixed ljitofix(signed int f) __attribute__((const)); 
paulo@0: 
paulo@0: static inline LJFixed ljitofix(signed int f) {
paulo@0:   return f << 16;
paulo@0: }
paulo@0: 
paulo@0: /*
paulo@0:  * In most cases, macros are deprecated in favor of static inline functions
paulo@0:  * because the latter allow the compiler to perform more type checks.
paulo@0:  * However, the C language forbids calling a function in an inline
paulo@0:  * constructor, even if it is a static inline function with no side effects.
paulo@0:  * For example, GCC gives the misleading error message
paulo@0:  * "error: initializer element is not constant".
paulo@0:  * Therefore, I have to provide a second implementation of ljitofix()
paulo@0:  * as a macro for use in global variable initializers.
paulo@0:  */
paulo@0: #define LJITOFIX(f) ((LJFixed)((f) << 16))
paulo@0: 
paulo@0: 
paulo@0: typedef unsigned int LJBits;
paulo@0: 
paulo@0: #endif
paulo@0: