source/graphics/Patch.cpp

   1 /* Copyright (C) 2010 Wildfire Games.
   2  * This file is part of 0 A.D.
   3  *
   4  * 0 A.D. is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * 0 A.D. is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * A patch of terrain holding NxN MiniPatch tiles
  20  */
  21
  22 #include "precompiled.h"
  23
  24 #include "Patch.h"
  25 #include "Terrain.h"
  26
  27
  28 ///////////////////////////////////////////////////////////////////////////////
  29 // CPatch constructor
  30 CPatch::CPatch()
  31 : m_Parent(0)
  32 {
  33 }
  34
  35 ///////////////////////////////////////////////////////////////////////////////
  36 // CPatch destructor
  37 CPatch::~CPatch()
  38 {
  39
  40 }
  41
  42 ///////////////////////////////////////////////////////////////////////////////
  43 // Initialize: setup patch data
  44 void CPatch::Initialize(CTerrain* parent,ssize_t x,ssize_t z)
  45 {
  46         delete m_RenderData;
  47         m_RenderData=0;
  48
  49         m_Parent=parent;
  50         m_X=x;
  51         m_Z=z;
  52
  53         InvalidateBounds();
  54 }
  55
  56 ///////////////////////////////////////////////////////////////////////////////
  57 // CalcBounds: calculating the bounds of this patch
  58 void CPatch::CalcBounds()
  59 {
  60         m_WorldBounds.SetEmpty();
  61
  62         for (ssize_t j=0;j<PATCH_SIZE+1;j++)
  63         {
  64                 for (ssize_t i=0;i<PATCH_SIZE+1;i++)
  65                 {
  66                         CVector3D pos;
  67                         m_Parent->CalcPosition(m_X*PATCH_SIZE+i,m_Z*PATCH_SIZE+j,pos);
  68                         m_WorldBounds+=pos;
  69                 }
  70         }
  71
  72         // If this a side patch, the sides go down to height 0, so add them
  73         // into the bounds
  74         if (GetSideFlags())
  75                 m_WorldBounds[0].Y = std::min(m_WorldBounds[0].Y, 0.f);
  76 }
  77
  78 int CPatch::GetSideFlags()
  79 {
  80         int flags = 0;
  81         if (m_X == 0)
  82                 flags |= CPATCH_SIDE_NEGX;
  83         if (m_Z == 0)
  84                 flags |= CPATCH_SIDE_NEGZ;
  85         if (m_X == m_Parent->GetPatchesPerSide()-1)
  86                 flags |= CPATCH_SIDE_POSX;
  87         if (m_Z == m_Parent->GetPatchesPerSide()-1)
  88                 flags |= CPATCH_SIDE_POSZ;
  89         return flags;
  90 }