Source/System/Window/Background/OSGTextureGrabBackground.cpp

   1 /*---------------------------------------------------------------------------*\
   2  *                                OpenSG                                     *
   3  *                                                                           *
   4  *                                                                           *
   5  *               Copyright (C) 2000-2002 by the OpenSG Forum                 *
   6  *                                                                           *
   7  *                            www.opensg.org                                 *
   8  *                                                                           *
   9  *   contact: dirk@opensg.org, gerrit.voss@vossg.org, jbehr@zgdv.de          *
  10  *                                                                           *
  11 \*---------------------------------------------------------------------------*/
  12 /*---------------------------------------------------------------------------*\
  13  *                                License                                    *
  14  *                                                                           *
  15  * This library is free software; you can redistribute it and/or modify it   *
  16  * under the terms of the GNU Library General Public License as published    *
  17  * by the Free Software Foundation, version 2.                               *
  18  *                                                                           *
  19  * This library is distributed in the hope that it will be useful, but       *
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of                *
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  22  * Library General Public License for more details.                          *
  23  *                                                                           *
  24  * You should have received a copy of the GNU Library General Public         *
  25  * License along with this library; if not, write to the Free Software       *
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                 *
  27  *                                                                           *
  28 \*---------------------------------------------------------------------------*/
  29 /*---------------------------------------------------------------------------*\
  30  *                                Changes                                    *
  31  *                                                                           *
  32  *                                                                           *
  33  *                                                                           *
  34  *                                                                           *
  35  *                                                                           *
  36  *                                                                           *
  37 \*---------------------------------------------------------------------------*/
  38
  39 //---------------------------------------------------------------------------
  40 //  Includes
  41 //---------------------------------------------------------------------------
  42
  43 #include <cstdlib>
  44 #include <cstdio>
  45
  46 #include "OSGConfig.h"
  47
  48 #include "OSGGL.h"
  49 #include "OSGGLU.h"
  50
  51 #include "OSGViewport.h"
  52 #include "OSGImage.h"
  53 #include "OSGTextureObjChunk.h"
  54 #include "OSGDrawEnv.h"
  55
  56 #include "OSGTextureGrabBackground.h"
  57
  58 OSG_USING_NAMESPACE
  59
  60 // Documentation for this class is emited in the
  61 // OSGTextureGrabBackgroundBase.cpp file.
  62 // To modify it, please change the .fcd file (OSGTextureGrabBackground.fcd) and
  63 // regenerate the base file.
  64
  65 /***************************************************************************\
  66  *                           Class variables                               *
  67 \***************************************************************************/
  68
  69 /***************************************************************************\
  70  *                           Class methods                                 *
  71 \***************************************************************************/
  72
  73 void TextureGrabBackground::initMethod(InitPhase ePhase)
  74 {
  75     Inherited::initMethod(ePhase);
  76 }
  77
  78
  79 /***************************************************************************\
  80  *                           Instance methods                              *
  81 \***************************************************************************/
  82
  83 /*-------------------------------------------------------------------------*\
  84  -  private                                                                 -
  85 \*-------------------------------------------------------------------------*/
  86
  87 /*----------------------- constructors & destructors ----------------------*/
  88
  89 TextureGrabBackground::TextureGrabBackground(void) :
  90     Inherited()
  91 {
  92 }
  93
  94 TextureGrabBackground::TextureGrabBackground(
  95     const TextureGrabBackground &source) :
  96
  97     Inherited(source)
  98 {
  99 }
 100
 101 TextureGrabBackground::~TextureGrabBackground(void)
 102 {
 103 }
 104
 105 /*----------------------------- class specific ----------------------------*/
 106
 107 void TextureGrabBackground::changed(ConstFieldMaskArg whichField,
 108                                     UInt32            origin,
 109                                     BitVector         details)
 110 {
 111     Inherited::changed(whichField, origin, details);
 112 }
 113
 114 /*-------------------------- your_category---------------------------------*/
 115
 116 void TextureGrabBackground::clear(DrawEnv *pEnv)
 117 {
 118     // grab the texture
 119     TextureObjChunk *t = getTexture();
 120
 121     if(t == NULL)       // No texture, no grab.
 122     {
 123         Inherited::clear(pEnv);
 124         return;
 125     }
 126
 127     Int32  pw = pEnv->getPixelWidth ();
 128     Int32  ph = pEnv->getPixelHeight();
 129
 130     // Ignore empty viewports
 131     if(pw < 1 || ph < 1)
 132         return;
 133
 134     Image *i = t->getImage();
 135
 136     // If image is smaller than 2x2, resize it to vp size
 137     // the 2x2 is because you can't create 0x0 images
 138     if((i->getWidth() <= 1 && i->getHeight() <= 1) ||
 139        (getAutoResize() && (osgAbs(i->getWidth()  - pw) > 1 ||
 140                             osgAbs(i->getHeight() - ph) > 1 ) ) )
 141     {
 142         i->set(i->getPixelFormat(), pw, ph);
 143     }
 144
 145     UInt32 w = osgMin(Int32(i->getWidth ()),  pw);
 146     UInt32 h = osgMin(Int32(i->getHeight()), ph);
 147
 148     glErr("TextureGrabBackground::activate precheck");
 149
 150     pEnv->getWindow()->validateGLObject(t->getGLId(), pEnv);
 151
 152     glErr("TextureGrabBackground::bind precheck");
 153
 154     GLenum bindTarget = getBindTarget(), copyTarget = getCopyTarget();
 155
 156     if(bindTarget == GL_NONE)
 157     {
 158         if(i->getDepth() > 1)
 159         {
 160             FWARNING(("TextureGrabBackground:: 3D textures not "
 161                       "supported for this window!\n"));
 162             Inherited::clear(pEnv);
 163             return;
 164         }
 165         else if(h > 1)
 166         {
 167             bindTarget = GL_TEXTURE_2D;
 168         }
 169         else
 170         {
 171 #ifndef OSG_OGL_ES2
 172             bindTarget = GL_TEXTURE_1D;
 173 #else
 174             return;
 175 #endif
 176         }
 177     }
 178
 179     if(copyTarget == GL_NONE)
 180         copyTarget = bindTarget;
 181
 182     glBindTexture(bindTarget,
 183                   pEnv->getWindow()->getGLObjectId(t->getGLId()));
 184
 185     glErr("TextureGrabBackground::copy precheck");
 186
 187     if(copyTarget == GL_TEXTURE_3D)
 188     {
 189         FWARNING(("TextureGrabBackground:: grabbing to 3D textures not "
 190                   "supported yet!\n"));
 191     }
 192 #ifndef OSG_OGL_ES2
 193     else if(copyTarget == GL_TEXTURE_1D)
 194     {
 195         glCopyTexSubImage1D(copyTarget, 0, 0,
 196                             pEnv->getPixelLeft(), pEnv->getPixelBottom(),
 197                             w);
 198     }
 199 #endif
 200     else
 201     {
 202         glCopyTexSubImage2D(copyTarget, 0, 0, 0,
 203                             pEnv->getPixelLeft(), pEnv->getPixelBottom(),
 204                             w, h);
 205     }
 206
 207     glErr("TextureGrabBackground::copy postcheck");
 208
 209     glBindTexture(bindTarget, 0);
 210
 211     // now do the clearing
 212     Inherited::clear(pEnv);
 213 }
 214
 215 /*------------------------------- dump ----------------------------------*/
 216
 217 void TextureGrabBackground::dump(      UInt32    ,
 218                                  const BitVector ) const
 219 {
 220     SLOG << "Dump TextureGrabBackground NI" << std::endl;
 221 }