00001 /*--License: 00002 Kyra Sprite Engine 00003 Copyright Lee Thomason (Grinning Lizard Software) 2001-2002 00004 www.grinninglizard.com/kyra 00005 www.sourceforge.net/projects/kyra 00006 00007 Kyra is provided under 2 licenses: 00008 00009 - The GPL, with no additional restrictions. 00010 - The LGPL, provided you display the Kyra splash screen, described below. 00011 00012 00013 --- GPL License -- 00014 This program is free software; you can redistribute it and/or 00015 modify it under the terms of the GNU General Public License 00016 as published by the Free Software Foundation; either version 2 00017 of the License, or (at your option) any later version. 00018 00019 This program is distributed in the hope that it will be useful, 00020 but WITHOUT ANY WARRANTY; without even the implied warranty of 00021 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00022 GNU General Public License for more details. 00023 00024 You should have received a copy of the GNU General Public License 00025 along with this program; if not, write to the Free Software 00026 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00027 00028 The full text of the license can be found in license.txt 00029 00030 00031 --- LGPL License -- 00032 **Provided you kindly display the Kyra splash screen (details below), 00033 you may use the LGPL license:** 00034 00035 This library is free software; you can redistribute it and/or 00036 modify it under the terms of the GNU Lesser General Public 00037 License as published by the Free Software Foundation; either 00038 version 2.1 of the License, or (at your option) any later version. 00039 00040 This library is distributed in the hope that it will be useful, 00041 but WITHOUT ANY WARRANTY; without even the implied warranty of 00042 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00043 Lesser General Public License for more details. 00044 00045 You should have received a copy of the GNU Lesser General Public 00046 License along with this library; if not, write to the Free Software 00047 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00048 00049 The full text of the license can be found in lgpl.txt 00050 00051 00052 --- Kyra Splash Screen. 00053 00054 It would be appreciate if you display the Kyra splash screen when using 00055 either license, however it is only required for the LGPL. All the 00056 resources for the splash are compiled into the library, and it can be 00057 accessed through the following API: 00058 00059 KrEngine::StartSplash 00060 KrEngine::UpdateSplash 00061 KrEngine::EndSplash 00062 00063 Full documentation is provided with the KrEngine class. The splash screen 00064 should be displayed for 2 seconds. 00065 00066 Thank you. 00067 */ 00068 00069 #ifndef GL_RANDOM_INCLUDED 00070 #define GL_RANDOM_INCLUDED 00071 00072 #include "gltypes.h" 00073 #include "gldebug.h" 00074 #include <stdlib.h> 00075 00081 class GlRandom 00082 { 00083 public: 00085 GlRandom( U32 _seed = 0 ); 00086 00092 void SetSeed( U32 _seed ); 00093 00095 U16 Rand() { return Randomize(); } 00099 U16 Rand( U16 upperBound ) { return Randomize() % upperBound; } 00100 00104 U16 RandD2( U16 upperBound ) { U16 d1 = upperBound / 2 + 1; 00105 U16 d2 = upperBound - d1 + 1; 00106 U16 r = Rand( d1 ) + Rand( d2 ); 00107 GLASSERT( r < upperBound ); 00108 return r; 00109 } 00110 00114 U16 RandD3( U16 upperBound ) { U16 d1 = upperBound / 3 + 2; 00115 U16 d2 = upperBound / 3 + 2; 00116 U16 d3 = upperBound - d1 - d2 + 2; 00117 U16 r = Rand( d1 ) + Rand( d2 ) + Rand( d3 ); 00118 GLASSERT( r < upperBound ); 00119 return r; 00120 } 00121 00123 double DRand( double upper ) { return upper * double( Randomize() ) / 65535.0; } 00124 00126 float FRand( float upper ) { return upper * float( Randomize() ) / 65535.0f; } 00127 00129 bool Boolean() { return Rand( 100 ) >= 50; } 00130 00131 private: 00132 U32 seed; 00133 inline void CalcSeed() { seed = seed * 39421 + 1; } 00134 U16 Randomize(); 00135 00136 enum { 00137 TABLESIZE = 16, 00138 SLOTWIDTH = 0x10000 / TABLESIZE 00139 }; 00140 00141 U16 seedTable[ TABLESIZE ]; 00142 }; 00143 00144 00145 #endif