src/client/water/Water2Constants.h

   1 ////////////////////////////////////////////////////////////////////////////////
   2 //    Scorched3D (c) 2000-2009
   3 //
   4 //    This file is part of Scorched3D.
   5 //
   6 //    Scorched3D is free software; you can redistribute it and/or modify
   7 //    it under the terms of the GNU General Public License as published by
   8 //    the Free Software Foundation; either version 2 of the License, or
   9 //    (at your option) any later version.
  10 //
  11 //    Scorched3D is distributed in the hope that it will be useful,
  12 //    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //    GNU General Public License for more details.
  15 //
  16 //    You should have received a copy of the GNU General Public License
  17 //    along with Scorched3D; if not, write to the Free Software
  18 //    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 ////////////////////////////////////////////////////////////////////////////////
  20
  21 #if !defined(__INCLUDE_Water2Constantsh_INCLUDE__)
  22 #define __INCLUDE_Water2Constantsh_INCLUDE__
  23
  24 #include <common/Vector.h>
  25
  26 static inline float myfmod(float a, float b) { return a-floorf(a/b)*b; }//fmod is different for negative a/b
  27
  28 static const float wave_tidecycle_time = 10.24f;
  29 static const unsigned int wave_phases = 256;
  30 static const unsigned int wave_patch_width = 64;
  31 static const unsigned int wave_resolution = 128;
  32
  33 static const float grid_size = 512.0f / (256.0f / float(wave_patch_width));
  34 static const float half_grid_size = grid_size / 2.0f;
  35
  36 static const float wavetile_length = 256.0f;
  37 static const float wave_waterwidth = wavetile_length;
  38 static const float wavetile_length_rcp = 1.0f / wavetile_length;
  39
  40 static const float VIRTUAL_PLANE_HEIGHT = 25.0f;
  41
  42 #define REFRAC_COLOR_RES 32
  43 #define FRESNEL_FCT_RES 256
  44
  45 class Water2Points
  46 {
  47 public:
  48         Vector &getPoint(int x, int y)
  49         {
  50                 DIALOG_ASSERT(x>=0 && y>=0 && x<wave_resolution && y<wave_resolution);
  51                 return points[x][y];
  52         };
  53
  54 private:
  55         Vector points[wave_resolution][wave_resolution];
  56 };
  57
  58 static inline float exact_fresnel(float x)
  59 {
  60         // the real formula (recheck it!)
  61 /*
  62         float g = 1.333f + x*x - 1;
  63         float z1 = g-x;
  64         float z2 = g+x;
  65         return (z1*z1)*(1+((x*z2-1)*(x*z2-1))/((x*z1+1)*(x*z1+1)))/(2*z2*z2);
  66 */
  67
  68 /*
  69         // a very crude guess
  70         float tmp = 1-4*x;
  71         if (tmp < 0.0f) tmp = 0.0f;
  72         return tmp;
  73 */
  74         // a good approximation (1/(x+1)^8)
  75         float x1 = x + 1.0f;
  76         float x2 = x1*x1;
  77         float x4 = x2*x2;
  78         return 1.0f/(x4*x4);
  79 }
  80
  81
  82 #endif // __INCLUDE_Water2Constantsh_INCLUDE__