Source/System/Window/Base/OSGPerspectiveCamera.cpp

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  37 \*---------------------------------------------------------------------------*/
  38
  39 //---------------------------------------------------------------------------
  40 //  Includes
  41 //---------------------------------------------------------------------------
  42
  43 #include <cstdlib>
  44 #include <cstdio>
  45 #include <cmath>
  46
  47 #include "OSGConfig.h"
  48
  49 #include "OSGBaseTypes.h"
  50 #include "OSGLog.h"
  51 #include "OSGVector.h"
  52 #include "OSGMatrix.h"
  53 #include "OSGMatrixUtility.h"
  54
  55 #include "OSGWindow.h"
  56 #include "OSGViewport.h"
  57 #include "OSGCamera.h"
  58 #include "OSGWindow.h"
  59 #include "OSGBackground.h"
  60 #include "OSGPerspectiveCamera.h"
  61
  62 OSG_USING_NAMESPACE
  63
  64 // Documentation for this class is emited in the
  65 // OSGPerspectiveCameraBase.cpp file.
  66 // To modify it, please change the .fcd file (OSGPerspectiveCamera.fcd) and
  67 // regenerate the base file.
  68
  69 /***************************************************************************\
  70  *                           Class methods                                 *
  71 \***************************************************************************/
  72
  73 /*-------------------------------------------------------------------------*\
  74  -  private                                                                -
  75 \*-------------------------------------------------------------------------*/
  76
  77 void PerspectiveCamera::initMethod(InitPhase ePhase)
  78 {
  79     Inherited::initMethod(ePhase);
  80 }
  81
  82 /***************************************************************************\
  83  *                           Instance methods                              *
  84 \***************************************************************************/
  85
  86 /*-------------------------------------------------------------------------*\
  87  -  public                                                                 -
  88 \*-------------------------------------------------------------------------*/
  89
  90
  91 /*------------- constructors & destructors --------------------------------*/
  92
  93 PerspectiveCamera::PerspectiveCamera(void) :
  94     Inherited()
  95 {
  96 }
  97
  98 PerspectiveCamera::PerspectiveCamera(const PerspectiveCamera &source) :
  99     Inherited(source)
 100 {
 101 }
 102
 103 PerspectiveCamera::~PerspectiveCamera(void)
 104 {
 105 }
 106
 107 void PerspectiveCamera::changed(ConstFieldMaskArg whichField,
 108                                 UInt32            origin,
 109                                 BitVector         details)
 110 {
 111     Inherited::changed(whichField, origin, details);
 112 }
 113
 114 /*-------------------------- your_category---------------------------------*/
 115
 116
 117
 118 void PerspectiveCamera::getProjection(Matrix &result,
 119                                       UInt32  width,
 120                                       UInt32  height)
 121 {
 122     Real32 fov = getFov();
 123
 124     // catch some illegal cases
 125
 126     if(fov < 0 || width == 0 || height == 0)
 127     {
 128         result.setIdentity();
 129         return;
 130     }
 131
 132     // try to be nice to people giving degrees...
 133
 134     if(fov > Pi)
 135         fov = osgDegree2Rad(fov);
 136
 137
 138     Real32 rNear  = getNear();
 139     Real32 rFar   = getFar ();
 140     Real32 aspect = Real32(width) / Real32(height) * getAspect();
 141     Real32 ct     = osgTan(fov / 2.f);
 142
 143     if(rNear > rFar)
 144     {
 145         SWARNING << "MatrixPerspective: near " << rNear << " > far " << rFar
 146                  << "!\n" << std::endl;
 147         result.setIdentity();
 148         return;
 149     }
 150
 151     if(fov <= TypeTraits<Real32>::getDefaultEps())
 152     {
 153         SWARNING << "MatrixPerspective: fov " << fov << " very small!\n"
 154                  << std::endl;
 155         result.setIdentity();
 156         return;
 157     }
 158
 159     if(osgAbs(rNear - rFar) < TypeTraits<Real32>::getDefaultEps())
 160     {
 161         SWARNING << "MatrixPerspective: near " << rNear << " ~= far " << rFar
 162                  << "!\n" << std::endl;
 163         result.setIdentity();
 164         return;
 165     }
 166
 167     if(aspect < TypeTraits<Real32>::getDefaultEps())
 168     {
 169         SWARNING << "MatrixPerspective: aspect ratio " << aspect
 170                  << " very small!\n" << std::endl;
 171         result.setIdentity();
 172         return;
 173     }
 174
 175     Real32 x = ct * rNear;
 176     Real32 y = ct * rNear;
 177
 178     UInt32 fovMode = getFovMode();
 179
 180     switch (fovMode)
 181     {
 182         case VerticalFoV:
 183             x *= aspect;
 184             break;
 185
 186         case HorizontalFoV:
 187             y /= aspect;
 188             break;
 189
 190         case SmallerFoV:
 191             if(width * getAspect() >= height)
 192             {
 193                 x *= aspect;
 194             }
 195             else
 196             {
 197                 y /= aspect;
 198             }
 199             break;
 200
 201         default:
 202             result.setIdentity();
 203             return;
 204     }
 205
 206     MatrixFrustum( result,
 207                   -x,
 208                    x,
 209                   -y,
 210                    y,
 211                    rNear,
 212                    rFar);
 213
 214 }
 215
 216
 217 /*------------------------------- dump ----------------------------------*/
 218
 219 void PerspectiveCamera::dump(      UInt32    OSG_CHECK_ARG(uiIndent),
 220                              const BitVector OSG_CHECK_ARG(bvFlags)) const
 221 {
 222     SLOG << "Dump PerspectiveCamera NI" << std::endl;
 223 }
 224