Source/System/Window/Background/OSGTextureBackground.cpp

   1 /*---------------------------------------------------------------------------*\
   2  *                                OpenSG                                     *
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   5  *               Copyright (C) 2000-2002 by the OpenSG Forum                 *
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  29 /*---------------------------------------------------------------------------*\
  30  *                                Changes                                    *
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  37  \*---------------------------------------------------------------------------*/
  38
  39 //---------------------------------------------------------------------------
  40 //  Includes
  41 //---------------------------------------------------------------------------
  42
  43 #include <cstdlib>
  44 #include <cstdio>
  45
  46 #include "OSGConfig.h"
  47 #include "OSGViewport.h"
  48 #include "OSGTextureObjChunk.h"
  49
  50 #include "OSGTextureBackground.h"
  51
  52 #include<iostream>
  53
  54 OSG_USING_NAMESPACE
  55
  56 // Documentation for this class is emited in the
  57 // OSGTextureBackgroundBase.cpp file.
  58 // To modify it, please change the .fcd file (OSGTextureBackground.fcd) and
  59 // regenerate the base file.
  60
  61 /***************************************************************************\
  62  *                           Class variables                               *
  63 \***************************************************************************/
  64
  65 /***************************************************************************\
  66  *                           Class methods                                 *
  67 \***************************************************************************/
  68
  69 void TextureBackground::initMethod(InitPhase ePhase)
  70 {
  71     Inherited::initMethod(ePhase);
  72 }
  73
  74
  75 /***************************************************************************\
  76  *                           Instance methods                              *
  77 \***************************************************************************/
  78
  79 /*-------------------------------------------------------------------------*\
  80   -  private                                                                 -
  81   \*-------------------------------------------------------------------------*/
  82
  83 /*----------------------- constructors & destructors ----------------------*/
  84
  85 TextureBackground::TextureBackground(void) :
  86      Inherited         (   ),
  87     _textureCoordArray (   ),
  88     _vertexCoordArray  (   ),
  89     _indexArray        (   ),
  90     _hor               (0  ),
  91     _vert              (0  ),
  92     _radialDistortion  (0.f),
  93     _centerOfDistortion(   )
  94 {
  95 }
  96
  97 TextureBackground::TextureBackground(const TextureBackground &source) :
  98      Inherited         (source                    ),
  99     _textureCoordArray (source._textureCoordArray ),
 100     _vertexCoordArray  (source._vertexCoordArray  ),
 101     _indexArray        (source._indexArray        ),
 102     _hor               (source._hor               ),
 103     _vert              (source._vert              ),
 104     _radialDistortion  (source._radialDistortion  ),
 105     _centerOfDistortion(source._centerOfDistortion)
 106 {
 107 }
 108
 109 TextureBackground::~TextureBackground(void)
 110 {
 111 }
 112
 113 /*----------------------------- class specific ----------------------------*/
 114
 115
 116
 117
 118 void TextureBackground::changed(ConstFieldMaskArg whichField,
 119                                 UInt32            origin,
 120                                 BitVector         details)
 121 {
 122     Inherited::changed(whichField, origin, details);
 123
 124     // all updates are handled in updateGrid()
 125 }
 126
 127
 128 void TextureBackground::updateGrid(void)
 129 {
 130     bool gridChanged=( (getHor() != _hor) ||
 131                        (getVert() != _vert) );
 132
 133     if(gridChanged)
 134     {
 135         //resize grid
 136             UInt32 gridCoords=(getHor()+2)*(getVert()+2);
 137
 138             _textureCoordArray.resize(gridCoords);
 139             _vertexCoordArray .resize(gridCoords);
 140
 141             int indexArraySize=(getHor()+2)*((getVert()+1)*2);
 142             _indexArray.resize(indexArraySize);
 143
 144         _hor = getHor();
 145         _vert = getVert();
 146     }
 147
 148     if(gridChanged || _radialDistortion   != getRadialDistortion() ||
 149                       _centerOfDistortion != getCenterOfDistortion() )
 150     {
 151         _radialDistortion = getRadialDistortion();
 152         _centerOfDistortion = getCenterOfDistortion();
 153
 154             // calculate grid coordinates and triangle strip indices
 155             float xStep=1.0/float(getHor()+1);
 156             float yStep=1.0/float(getVert()+1);
 157             std::vector<Vec2f>::iterator texCoord=_textureCoordArray.begin();
 158             std::vector<Vec2f>::iterator vertexCoord=_vertexCoordArray.begin();
 159             std::vector<UInt32>::iterator index=_indexArray.begin();
 160             UInt32 coord0(0),coord1(0);
 161             GLfloat x,y;
 162             Int16 xx,yy;
 163             Int16 xxmax=getHor()+2,yymax=getVert()+2;
 164             for(yy=0,y=0.0f;yy<yymax;yy++,y+=yStep)
 165             {
 166                 if(yy>0)
 167                 {
 168                         coord1=yy*xxmax;
 169                         coord0=coord1-xxmax;
 170                         *index++=coord1++;
 171                         *index++=coord0++;
 172                 }
 173                 float dy=y-getCenterOfDistortion().y();
 174                 float dy2=dy*dy;
 175                 for(xx=0,x=0.0f;xx<xxmax;xx++,x+=xStep)
 176                 {
 177                         *texCoord++=Vec2f(x,y);
 178                         float dx=(x-getCenterOfDistortion().x());
 179                         float dx2=dx*dx;
 180                         float dist2=dx2+dy2;
 181                         float deltaX=dx*getRadialDistortion()*dist2;
 182                         float deltaY=dy*getRadialDistortion()*dist2;
 183                         *vertexCoord++=Vec2f(x+deltaX,y+deltaY);
 184                         if(yy>0&&xx>0)
 185                         {
 186                             *index++=coord1++;
 187                             *index++=coord0++;
 188                         }
 189                 }
 190             }
 191     }
 192 }
 193
 194 void TextureBackground::clear(DrawEnv  *pEnv)
 195 {
 196 #if !defined(OSG_OGL_COREONLY) || defined(OSG_CHECK_COREONLY)
 197     TextureBaseChunk *tex = getTexture();
 198
 199     if(tex == NULL)
 200     {
 201         glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 202         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 203         return;
 204     }
 205
 206     glPushAttrib(GL_POLYGON_BIT | GL_DEPTH_BUFFER_BIT |
 207                  GL_LIGHTING_BIT);
 208
 209     glDisable(GL_LIGHTING);
 210
 211 #if 1
 212     // original mode
 213     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 214 #else
 215     // for testing the grid
 216     glColor3f(1.0f, 1.0f, 1.0f);
 217     glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 218 #endif
 219     glClear(GL_DEPTH_BUFFER_BIT);
 220
 221     glDisable(GL_DEPTH_TEST);
 222     glDepthFunc(GL_ALWAYS);
 223     glDepthMask(GL_FALSE);
 224
 225     glMatrixMode(GL_MODELVIEW);
 226     glPushMatrix();
 227     glLoadIdentity();
 228
 229     glMatrixMode(GL_PROJECTION);
 230     glPushMatrix();
 231
 232     glLoadIdentity();
 233     glOrtho(0, 1, 0, 1, 0, 1);
 234
 235     glColor4fv(getColor().getValuesRGBA());
 236
 237     tex->activate(pEnv);
 238
 239     if(tex->isTransparent())
 240     {
 241         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 242         glEnable(GL_BLEND);
 243     }
 244     if(osgAbs(getRadialDistortion()) < TypeTraits<Real32>::getDefaultEps())
 245     {
 246             if(getMFTexCoords()->size() < 4)
 247             {
 248                 // set some default texture coordinates.
 249                 glBegin(GL_QUADS);
 250                 glTexCoord2f(0.0f, 0.0f);
 251                 glVertex3f(0.0f, 0.0f, 0.0f);
 252                 glTexCoord2f(1.0f, 0.0f);
 253                 glVertex3f(1.0f, 0.0f, 0.0f);
 254                 glTexCoord2f(1.0f, 1.0f);
 255                 glVertex3f(1.0f, 1.0f, 0.0f);
 256                 glTexCoord2f(0.0f, 1.0f);
 257                 glVertex3f(0.0f, 1.0f, 0.0f);
 258                 glEnd();
 259             }
 260             else
 261             {
 262                 glBegin(GL_QUADS);
 263             {
 264                 glTexCoord2f(getTexCoords(0).getValues()[0],
 265                              getTexCoords(0).getValues()[1]);
 266                 glVertex3f(0.0f, 0.0f, 0.0f);
 267                 glTexCoord2f(getTexCoords(1).getValues()[0],
 268                              getTexCoords(1).getValues()[1]);
 269                 glVertex3f(1.0f, 0.0f, 0.0f);
 270                 glTexCoord2f(getTexCoords(2).getValues()[0],
 271                              getTexCoords(2).getValues()[1]);
 272                 glVertex3f(1.0f, 1.0f, 0.0f);
 273                 glTexCoord2f(getTexCoords(3).getValues()[0],
 274                              getTexCoords(3).getValues()[1]);
 275                 glVertex3f(0.0f, 1.0f, 0.0f);
 276             }
 277                 glEnd();
 278             }
 279     }
 280     else // map texture to distortion grid
 281     {
 282         updateGrid();
 283             Int16 xxmax=getHor()+2,yymax=getVert()+2;
 284
 285             UInt32 gridCoords=xxmax*yymax;
 286             UInt32 indexArraySize=xxmax*((getVert()+1)*2);
 287
 288             if(_vertexCoordArray.size()==gridCoords &&
 289                _textureCoordArray.size()==gridCoords &&
 290                _indexArray.size()==indexArraySize)
 291             {
 292                 // clear background, because possibly the distortion grid
 293             // could not cover th whole window
 294                 glClearColor(.5f, 0.5f, 0.5f, 1.0f);
 295                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 296                 UInt32 yMax=getVert()+1;
 297                 for(UInt32 y=0;y<yMax;y++)
 298                 {
 299                         glBegin(GL_TRIANGLE_STRIP);
 300                         std::vector<UInt32>::iterator begin=_indexArray.begin()+(y*2*xxmax);
 301                         std::vector<UInt32>::iterator end=begin+2*xxmax;
 302                         for(std::vector<UInt32>::iterator i=begin;i!=end;i++)
 303                         {
 304                             glTexCoord2fv(_textureCoordArray[*i].getValues());
 305                             glVertex2fv(_vertexCoordArray[*i].getValues());
 306
 307                         }
 308                         glEnd();
 309                 }
 310             }
 311     }
 312     if(tex->isTransparent())
 313     {
 314         glDisable(GL_BLEND);
 315     }
 316
 317     tex->deactivate(pEnv);
 318
 319     Int32 bit = getClearStencilBit();
 320
 321     if (bit >= 0)
 322     {
 323         glClearStencil(bit);
 324         glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 325     }
 326     else
 327     {
 328         glClear(GL_DEPTH_BUFFER_BIT);
 329     }
 330
 331     glPopMatrix();
 332     glMatrixMode(GL_MODELVIEW);
 333     glPopMatrix();
 334
 335     glPopAttrib();
 336
 337     glColor3f(1.0f, 1.0f, 1.0f);
 338 #endif
 339 }
 340
 341
 342 void TextureBackground::dump(      UInt32    ,
 343                                    const BitVector ) const
 344 {
 345     SLOG << "Dump TextureBackground NI" << std::endl;
 346 }
 347