libnds: trig_lut.h ソースファイル

00001 /*---------------------------------------------------------------------------------
00002 
00003         Trig_lut.h provides access to external precompiled trig look up tables
00004 
00005         Copyright (C) 2005
00006                 Michael Noland (joat)
00007                 Jason Rogers (dovoto)
00008                 Dave Murphy (WinterMute)
00009 
00010         This software is provided 'as-is', without any express or implied
00011         warranty.  In no event will the authors be held liable for any
00012         damages arising from the use of this software.
00013 
00014         Permission is granted to anyone to use this software for any
00015         purpose, including commercial applications, and to alter it and
00016         redistribute it freely, subject to the following restrictions:
00017 
00018         1.      The origin of this software must not be misrepresented; you
00019                 must not claim that you wrote the original software. If you use
00020                 this software in a product, an acknowledgment in the product
00021                 documentation would be appreciated but is not required.
00022         2.      Altered source versions must be plainly marked as such, and
00023                 must not be misrepresented as being the original software.
00024         3.      This notice may not be removed or altered from any source
00025                 distribution.
00026 
00027 
00028 
00029 ---------------------------------------------------------------------------------*/
00030 #ifndef TRIG_LUT_H
00031 #define TRIG_LUT_H
00032 
00033 #include <nds/ndstypes.h>
00034 
00055 #ifdef __cplusplus
00056 extern "C" {
00057 #endif
00058 
00059 #define DEGREES_IN_CIRCLE (1 << 15)
00060 
00061 #define fixedToInt(n, bits) ((int)((n)>>(bits)))
00062 #define intToFixed(n, bits) ((int)((n)<<(bits)))
00063 
00064 #define floatToFixed(n, bits) ((int)((n) * (float)(1<<(bits))))
00065 #define fixedToFloat(n, bits) (((float)(n)) / (float)(1<<(bits)))
00066 
00067 #define floorFixed(n, bits) ((int)((n) & ~(((1 << (bits)) - 1))))
00068 
00069 #define degreesToAngle(degrees) ((degrees) * DEGREES_IN_CIRCLE / 360)
00070 #define angleToDegrees(angle)   ((angle) * 360 / DEGREES_IN_CIRCLE)
00071 
00072 
00080 s16 cosLerp(s16 angle);
00088 s16 sinLerp(s16 angle);
00089 
00097 s32 tanLerp(s16 angle);
00098 
00106 s16 acosLerp(s16 par);
00114 s16 asinLerp(s16 par);
00115 
00116 
00117 
00118 #ifdef __cplusplus
00119 }
00120 #endif
00121 
00122 #endif