Dogcows Code - chaz/yoink/blob - src/Moof/Ray.hh

   1
   2 /*******************************************************************************
   3
   4  Copyright (c) 2009, Charles McGarvey
   5  All rights reserved.
   6
   7  Redistribution   and   use  in  source  and  binary  forms,  with  or  without
   8  modification, are permitted provided that the following conditions are met:
   9
  10    * Redistributions  of  source  code  must retain the above copyright notice,
  11      this list of conditions and the following disclaimer.
  12    * Redistributions  in binary form must reproduce the above copyright notice,
  13      this  list of conditions and the following disclaimer in the documentation
  14      and/or other materials provided with the distribution.
  15
  16  THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  20  FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  23  CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26
  27 *******************************************************************************/
  28
  29 #ifndef _MOOF_RAY_HH_
  30 #define _MOOF_RAY_HH_
  31
  32 #include <Moof/Drawable.hh>
  33 #include <Moof/Math.hh>
  34 #include <Moof/OpenGL.hh>
  35 #include <Moof/Texture.hh>
  36
  37
  38 namespace Mf {
  39
  40
  41 /**
  42  * A line that goes to infinity.
  43  */
  44
  45 template <int D>
  46 struct Ray : public Drawable
  47 {
  48         typedef cml::vector< Scalar, cml::fixed<D> >    Vector;
  49
  50         // solution = point + t*direction
  51         Vector  point;
  52         Vector  direction;
  53
  54         struct Intersection
  55         {
  56                 Scalar  distance;       // distance from the origin to the nearest point
  57                 Vector  normal;         // surface normal at intersection point
  58
  59                 bool operator < (const Intersection& rhs)
  60                 {
  61                         return distance < rhs.distance;
  62                 }
  63         };
  64
  65         void solve(Vector& p, Scalar t) const
  66         {
  67                 p = point + t*direction;
  68         }
  69
  70         void draw(Scalar alpha = 0.0) const
  71         {
  72                 Vector end = point + 1000.0 * direction;
  73                 // TODO this is kinda cheesy
  74
  75                 Mf::Texture::resetBind();
  76                 glBegin(GL_LINES);
  77                         glVertex(point);
  78                         glVertex(end);
  79                 glEnd();
  80         }
  81
  82         void normalize()
  83         {
  84                 direction.normalize();
  85         }
  86 };
  87
  88
  89 } // namespace Mf
  90
  91 #endif // _MOOF_RAY_HH_
  92
  93 /** vim: set ts=4 sw=4 tw=80: *************************************************/
  94