osg for android (四) osgText显示文字以及显示中文的问题

       前提：很悲催的是，昨晚编译了一个晚上的osg3.2.1 for android 由于忘记将3rdParty扔到源码目录，所以虽然编译能够正常完成，但是实际中还是无法使用。今天将继续osg3.0.1，在osg论坛已经有人报告了这个问题：原因是因为GLES2并不支持标准的MipMap，并在这里给出了修改源码的文件，但是将 Glyph.cpp 这个文件覆盖源文件，再编译，出现如下的问题，这个问题比较好解决。

 C++ Code 

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In member function  'virtual void osgText::GlyphTexture::apply(osg::State&) const' error: 'requiresGenrateMipmapCall' was  not declared in  this scop

      下面给出修改好的Glyph.cpp文件

 C++ Code 

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield   *  * This library is open source and may be redistributed and/or modified under    * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or   * (at your option) any later version.  The full license is in LICENSE file  * included with this distribution, and on the openscenegraph.org website.  *   * This library is distributed in the hope that it will be useful,  * but WITHOUT ANY WARRANTY; without even the implied warranty of  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   * OpenSceneGraph Public License for more details. */ #include  #include  #include  #include  #include  #include  #include  #include  #include  "GlyphGeometry.h" using  namespace osgText; using  namespace std; GlyphTexture::GlyphTexture():     _margin( 1),     _marginRatio( 0.02f),     _usedY( 0),     _partUsedX( 0),     _partUsedY( 0) {     setWrap(WRAP_S, CLAMP_TO_EDGE);     setWrap(WRAP_T, CLAMP_TO_EDGE); } GlyphTexture::~GlyphTexture()  { } // return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. int GlyphTexture::compare( const osg::StateAttribute& rhs)  const {      if ( this<&rhs)  return - 1;      else  if ( this>&rhs)  return  1;      return  0; } bool GlyphTexture::getSpaceForGlyph(Glyph* glyph,  int& posX,  int& posY) {      int maxAxis = std::max(glyph->s(), glyph->t());      int margin = _margin + ( int)(( float)maxAxis * _marginRatio);           int width = glyph->s()+ 2*margin;      int height = glyph->t()+ 2*margin;      // first check box (_partUsedX,_usedY) to (width,height)      if (width <= (getTextureWidth()-_partUsedX) &&         height <= (getTextureHeight()-_usedY))     {          // can fit in existing row.          // record the position in which the texture will be stored.         posX = _partUsedX+margin;         posY = _usedY+margin;                  // move used markers on.         _partUsedX += width;          if (_usedY+height>_partUsedY) _partUsedY = _usedY+height;          return  true;     }           // start an new row.      if (width <= getTextureWidth() &&         height <= (getTextureHeight()-_partUsedY))     {          // can fit next row.         _partUsedX =  0;         _usedY = _partUsedY;         posX = _partUsedX+margin;         posY = _usedY+margin;                  // move used markers on.         _partUsedX += width;          if (_usedY+height>_partUsedY) _partUsedY = _usedY+height;          return  true;     }      // doesn't fit into glyph.      return  false; } void GlyphTexture::addGlyph(Glyph* glyph,  int posX,  int posY) {     OpenThreads::ScopedLock lock(_mutex);     _glyphs.push_back(glyph);      for( unsigned  int i= 0;i<_glyphsToSubload.size();++i)     {         _glyphsToSubload[i].push_back(glyph);     }      // set up the details of where to place glyph's image in the texture.     glyph->setTexture( this);     glyph->setTexturePosition(posX,posY);     glyph->setMinTexCoord( osg::Vec2(  static_cast< float>(posX)/ static_cast< float>(getTextureWidth()),                                        static_cast< float>(posY)/ static_cast< float>(getTextureHeight()) ) );     glyph->setMaxTexCoord( osg::Vec2(  static_cast< float>(posX+glyph->s())/ static_cast< float>(getTextureWidth()),                                        static_cast< float>(posY+glyph->t())/ static_cast< float>(getTextureHeight()) ) ); } void GlyphTexture::apply(osg::State& state)  const {       #if defined(OSG_GLES2_AVAILABLE)          bool requiresGenerateMipmapCall =  false;      #endif      // get the contextID (user defined ID of 0 upwards) for the       // current OpenGL context.      const  unsigned  int contextID = state.getContextID();      if (contextID>=_glyphsToSubload.size())     {         OpenThreads::ScopedLock lock(_mutex);          // graphics context is beyond the number of glyphsToSubloads, so          // we must now copy the glyph list across, this is a potential          // threading issue though is multiple applies are happening the          // same time on this object - to avoid this condition number of          // graphics contexts should be set before create text.          for( unsigned  int i=_glyphsToSubload.size();i<=contextID;++i)         {             GlyphPtrList& glyphPtrs = _glyphsToSubload[i];              for(GlyphRefList::const_iterator itr=_glyphs.begin();                 itr!=_glyphs.end();                 ++itr)             {                 glyphPtrs.push_back(itr->get());             }         }     }      const Extensions* extensions = getExtensions(contextID, true);      bool generateMipMapSupported = extensions->isGenerateMipMapSupported();      // get the texture object for the current contextID.     TextureObject* textureObject = getTextureObject(contextID);           bool newTextureObject = (textureObject ==  0);      if (newTextureObject)     {         GLint maxTextureSize =  256;         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);          if (maxTextureSize < getTextureWidth() || maxTextureSize < getTextureHeight())         {             OSG_WARN<< "Warning: osgText::Font texture size of ("<", "<") too large, unable to create font texture."<             OSG_WARN<< "         Maximum supported by hardward by native OpenGL implementation is ("<","<")."<             OSG_WARN<< "         Please set OSG_MAX_TEXTURE_SIZE lenvironment variable to "<" and re-run application."<              return;         }                   // being bound for the first time, need to allocate the texture         _textureObjectBuffer[contextID] = textureObject = osg::Texture::generateTextureObject(                  this, contextID,GL_TEXTURE_2D, 1,GL_ALPHA,getTextureWidth(), getTextureHeight(), 1, 0);         textureObject->bind();         applyTexParameters(GL_TEXTURE_2D,state);                   // need to look at generate mip map extension if mip mapping required.          switch(_min_filter)         {          case NEAREST_MIPMAP_NEAREST:          case NEAREST_MIPMAP_LINEAR:          case LINEAR_MIPMAP_NEAREST:          case LINEAR_MIPMAP_LINEAR:              if (generateMipMapSupported)             {                  #if defined(OSG_GLES2_AVAILABLE)                 requiresGenerateMipmapCall =  true;                  #else                 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS,GL_TRUE);                  #endif                       }              else glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, LINEAR);              break;          default:              // not mip mapping so no problems.              break;         }                   unsigned  int imageDataSize = getTextureHeight()*getTextureWidth();          unsigned  char* imageData =  new  unsigned  char[imageDataSize];          for( unsigned  int i= 0; i         {             imageData[i] =  0;         }                   // allocate the texture memory.         glTexImage2D( GL_TEXTURE_2D,  0, GL_ALPHA,                 getTextureWidth(), getTextureHeight(),  0,                 GL_ALPHA,                 GL_UNSIGNED_BYTE,                 imageData );                           delete [] imageData;          }      else     {          // reuse texture by binding.         textureObject->bind();                   if (getTextureParameterDirty(contextID))         {             applyTexParameters(GL_TEXTURE_2D,state);         }     }           static  const GLubyte* s_renderer =  0;      static  bool s_subloadAllGlyphsTogether =  false;      if (!s_renderer)     {         OpenThreads::ScopedLock lock(_mutex);         s_renderer = glGetString(GL_RENDERER);         OSG_INFO<< "glGetString(GL_RENDERER)=="<          if (s_renderer && strstr(( const  char*)s_renderer, "IMPACT")!= 0)         {              // we're running on an Octane, so need to work around its              // subloading bugs by loading all at once.             s_subloadAllGlyphsTogether =  true;         }                   if (s_renderer &&              ((strstr(( const  char*)s_renderer, "Radeon")!= 0) ||              (strstr(( const  char*)s_renderer, "RADEON")!= 0) ||             (strstr(( const  char*)s_renderer, "ALL-IN-WONDER")!= 0)))         {              // we're running on an ATI, so need to work around its              // subloading bugs by loading all at once.             s_subloadAllGlyphsTogether =  true;         }          if (s_renderer && strstr(( const  char*)s_renderer, "Sun")!= 0)         {              // we're running on an solaris x server, so need to work around its              // subloading bugs by loading all at once.             s_subloadAllGlyphsTogether =  true;         }          const  char* str = getenv( "OSG_TEXT_INCREMENTAL_SUBLOADING");          if (str)         {             s_subloadAllGlyphsTogether = strcmp(str, "OFF")== 0 || strcmp(str, "Off")== 0 || strcmp(str, "off")== 0;         }     }      // now subload the glyphs that are outstanding for this graphics context.     GlyphPtrList& glyphsWereSubloading = _glyphsToSubload[contextID];      if (!glyphsWereSubloading.empty() || newTextureObject)     {         OpenThreads::ScopedLock lock(_mutex);          bool subloadAllGlyphsTogether = s_subloadAllGlyphsTogether;          #if defined(OSG_GLES2_AVAILABLE)          if (requiresGenerateMipmapCall) subloadAllGlyphsTogether =  true;          #endif          if (!subloadAllGlyphsTogether)         {              if (newTextureObject)             {                  for(GlyphRefList::const_iterator itr=_glyphs.begin();                     itr!=_glyphs.end();                     ++itr)                 {                     (*itr)->subload();                 }             }              else  // just subload the new entries.             {                              // default way of subloading as required.                  //std::cout<<"subloading"<                 for(GlyphPtrList::iterator itr=glyphsWereSubloading.begin();                     itr!=glyphsWereSubloading.end();                     ++itr)                 {                     (*itr)->subload();                 }             }                           // clear the list since we have now subloaded them.             glyphsWereSubloading.clear();                      }          else         {             OSG_INFO<< "osgText::Font loading all glyphs as a single subload."<              // Octane has bugs in OGL driver which mean that subloads smaller              // than 32x32 produce errors, and also cannot handle general alignment,              // so to get round this copy all glyphs into a temporary image and              // then subload the whole lot in one go.              int tsize = getTextureHeight() * getTextureWidth();              unsigned  char *local_data =  new  unsigned  char[tsize];             memset( local_data, 0L, tsize);              for(GlyphRefList::const_iterator itr=_glyphs.begin();                 itr!=_glyphs.end();                 ++itr)             {                  //(*itr)->subload();                  // Rather than subloading to graphics, we'll write the values                  // of the glyphs into some intermediate data and subload the                  // whole thing at the end                  for(  int t =  0; t < (*itr)->t(); t++ )                 {                      for(  int s =  0; s < (*itr)->s(); s++ )                     {                          int sindex = (t*(*itr)->s()+s);                          int dindex =                               ((((*itr)->getTexturePositionY()+t) * getTextureWidth()) +                             ((*itr)->getTexturePositionX()+s));                          const  unsigned  char *sptr = &(*itr)->data()[sindex];                          unsigned  char *dptr       = &local_data[dindex];                         (*dptr)   = (*sptr);                     }                 }             }              // clear the list since we have now subloaded them.             glyphsWereSubloading.clear();              // Subload the image once             glTexSubImage2D( GL_TEXTURE_2D,  0,  0,  0,                      getTextureWidth(),                     getTextureHeight(),                     GL_ALPHA, GL_UNSIGNED_BYTE, local_data );              #if defined(OSG_GLES2_AVAILABLE)              if (requiresGenerateMipmapCall) glGenerateMipmap(GL_TEXTURE_2D);              #endif              delete [] local_data;         }     }      else     { //        OSG_INFO << "no need to subload "<    } //     if (generateMipMapTurnedOn) //     { //         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS,GL_FALSE); //     } } void GlyphTexture::setThreadSafeRefUnref( bool threadSafe) {     osg::Texture2D::setThreadSafeRefUnref(threadSafe); } void GlyphTexture::resizeGLObjectBuffers( unsigned  int maxSize) {     osg::Texture2D::resizeGLObjectBuffers(maxSize);      unsigned  int initialSize = _glyphsToSubload.size();     _glyphsToSubload.resize(maxSize);           for( unsigned i=initialSize; i<_glyphsToSubload.size(); ++i)     {          for(GlyphRefList::iterator itr = _glyphs.begin();             itr != _glyphs.end();             ++itr)         {             _glyphsToSubload[i].push_back(itr->get());         }     } } osg::Image* GlyphTexture::createImage() {     osg::ref_ptr image =  new osg::Image;     image->allocateImage(getTextureWidth(), getTextureHeight(),  1, GL_ALPHA, GL_UNSIGNED_BYTE);     memset(image->data(),  0, image->getTotalSizeInBytes());      for(GlyphRefList::iterator itr = _glyphs.begin();         itr != _glyphs.end();         ++itr)     {         Glyph* glyph = itr->get();         image->copySubImage(glyph->getTexturePositionX(), glyph->getTexturePositionY(),  0, glyph);     }      return image.release(); } // all the methods in Font::Glyph have been made non inline because VisualStudio6.0 is STUPID, STUPID, STUPID PILE OF JUNK. Glyph::Glyph(Font* font,  unsigned  int glyphCode):     _font(font),     _glyphCode(glyphCode),     _width( 1.0f),     _height( 1.0f),     _horizontalBearing( 0.0f, 0.f),     _horizontalAdvance( 0.f),     _verticalBearing( 0.0f, 0.f),     _verticalAdvance( 0.f),     _texture( 0),     _texturePosX( 0),     _texturePosY( 0),     _minTexCoord( 0.0f, 0.0f),     _maxTexCoord( 0.0f, 0.0f) {     setThreadSafeRefUnref( true); } Glyph::~Glyph() { } void Glyph::setHorizontalBearing( const osg::Vec2& bearing) {  _horizontalBearing=bearing; } const osg::Vec2& Glyph::getHorizontalBearing()  const {  return _horizontalBearing; } void Glyph::setHorizontalAdvance( float advance) { _horizontalAdvance=advance; } float Glyph::getHorizontalAdvance()  const {  return _horizontalAdvance; } void Glyph::setVerticalBearing( const osg::Vec2& bearing) {  _verticalBearing=bearing; } const osg::Vec2& Glyph::getVerticalBearing()  const {  return _verticalBearing; } void Glyph::setVerticalAdvance( float advance) {  _verticalAdvance=advance; } float Glyph::getVerticalAdvance()  const {  return _verticalAdvance; } void Glyph::setTexture(GlyphTexture* texture) { _texture = texture; } GlyphTexture* Glyph::getTexture() {  return _texture; } const GlyphTexture* Glyph::getTexture()  const {  return _texture; } void Glyph::setTexturePosition( int posX, int posY) { _texturePosX = posX; _texturePosY = posY; } int Glyph::getTexturePositionX()  const {  return _texturePosX; } int Glyph::getTexturePositionY()  const {  return _texturePosY; } void Glyph::setMinTexCoord( const osg::Vec2& coord) { _minTexCoord=coord; } const osg::Vec2& Glyph::getMinTexCoord()  const {  return _minTexCoord; } void Glyph::setMaxTexCoord( const osg::Vec2& coord) { _maxTexCoord=coord; } const osg::Vec2& Glyph::getMaxTexCoord()  const {  return _maxTexCoord; } void Glyph::subload()  const {     GLenum errorNo = glGetError();      if (errorNo!=GL_NO_ERROR)     {          const GLubyte* msg = osg::gluErrorString(errorNo);          if (msg) { OSG_WARN<< "before Glyph::subload(): detected OpenGL error: "<          else  { OSG_WARN<< "before Glyph::subload(): detected OpenGL error number: "<     }      if(s() <=  0 || t() <=  0)     {         OSG_INFO<< "Glyph::subload(): texture sub-image width and/or height of 0, ignoring operation."<          return;     }     glPixelStorei(GL_UNPACK_ALIGNMENT,getPacking());           #if !defined(OSG_GLES1_AVAILABLE) && !defined(OSG_GLES2_AVAILABLE)     glPixelStorei(GL_UNPACK_ROW_LENGTH,getRowLength());      #endif     glTexSubImage2D(GL_TEXTURE_2D, 0,                     _texturePosX,_texturePosY,                     s(),t(),                     (GLenum)getPixelFormat(),                     (GLenum)getDataType(),                     data());                          errorNo = glGetError();      if (errorNo!=GL_NO_ERROR)     {          const GLubyte* msg = osg::gluErrorString(errorNo);          if (msg) { OSG_WARN<< "after Glyph::subload() : detected OpenGL error: "<          else { OSG_WARN<< "after Glyph::subload() : detected OpenGL error number: "<         OSG_WARN<<  "\tglTexSubImage2D(0x"<" ,"<< 0<< "\t"<                                   "\t                "<<_texturePosX<< " ,"<<_texturePosY<                                   "\t                "<" ,"<                                   "\t                0x"<<(GLenum)getPixelFormat()<                                   "\t                0x"<<(GLenum)getDataType()<                                   "\t                0x"<<( unsigned  long)data()<< ");"<     }                     } Glyph3D::Glyph3D(Font* font,  unsigned  int glyphCode):     osg::Referenced( true),     _font(font),     _glyphCode(glyphCode),     _width( 1.0f),     _height( 1.0f),     _horizontalBearing( 0, 0),     _horizontalAdvance( 0),     _verticalBearing( 0, 0),     _verticalAdvance( 0)     {} void Glyph3D::setThreadSafeRefUnref( bool threadSafe) {      for(GlyphGeometries::iterator itr = _glyphGeometries.begin();         itr != _glyphGeometries.end();         ++itr)     {         (*itr)->setThreadSafeRefUnref(threadSafe);     } } GlyphGeometry* Glyph3D::getGlyphGeometry( const Style* style) {      for(GlyphGeometries::iterator itr = _glyphGeometries.begin();         itr != _glyphGeometries.end();         ++itr)     {         GlyphGeometry* glyphGeometry = itr->get();          if (glyphGeometry->match(style))         {             OSG_INFO<< "Glyph3D::getGlyphGeometry(Style* style) found matching GlyphGeometry."<              return glyphGeometry;         }     }     OSG_INFO<< "Glyph3D::getGlyphGeometry(Style* style) could not find matching GlyphGeometry, creating a new one."<     osg::ref_ptr glyphGeometry =  new GlyphGeometry();     glyphGeometry->setup( this, style);     _glyphGeometries.push_back(glyphGeometry);      return glyphGeometry.get(); } GlyphGeometry::GlyphGeometry() { } void GlyphGeometry::setThreadSafeRefUnref( bool threadSafe) {      if (_geode.valid()) _geode->setThreadSafeRefUnref(threadSafe); } void GlyphGeometry::setup( const Glyph3D* glyph,  const Style* style) {      float creaseAngle =  30.0f;      bool smooth =  true;     osg::ref_ptr shellGeometry;      if (!style)     {         OSG_INFO<< "GlyphGeometry::setup(const Glyph* glyph, NULL) creating default glyph geometry."<          float width =  0.1f;         _geometry = osgText::computeTextGeometry(glyph, width);     }      else     {         OSG_INFO<< "GlyphGeometry::setup(const Glyph* glyph, NULL) create glyph geometry with custom Style."<          // record the style         _style =  dynamic_cast(style->clone(osg::CopyOp::DEEP_COPY_ALL));          const Bevel* bevel = style ? style->getBevel() :  0;          bool outline = style ? style->getOutlineRatio()> 0.0f :  false;          float width = style->getThicknessRatio();          if (bevel)         {              float thickness = bevel->getBevelThickness();             osg::ref_ptr glyphGeometry = osgText::computeGlyphGeometry(glyph, thickness, width);             _geometry = osgText::computeTextGeometry(glyphGeometry.get(), *bevel, width);             shellGeometry = outline ? osgText::computeShellGeometry(glyphGeometry.get(), *bevel, width) :  0;         }          else         {             _geometry = osgText::computeTextGeometry(glyph, width);         }     }      if (!_geometry)     {         OSG_INFO<< "Warning: GlyphGeometry::setup(const Glyph* glyph, const Style* style) failed."<          return;     }     _geode =  new osg::Geode;     _geode->addDrawable(_geometry.get());      if (shellGeometry.valid()) _geode->addDrawable(shellGeometry.get());      // create the normals      if (smooth)     {         osgUtil::SmoothingVisitor::smooth(*_geometry, osg::DegreesToRadians(creaseAngle));     }     _vertices =  dynamic_cast(_geometry->getVertexArray());     _normals =  dynamic_cast(_geometry->getNormalArray());      for(osg::Geometry::PrimitiveSetList::iterator itr = _geometry->getPrimitiveSetList().begin();         itr != _geometry->getPrimitiveSetList().end();         ++itr)     {         osg::PrimitiveSet* prim = itr->get();          if (prim->getName()== "front") _frontPrimitiveSetList.push_back(prim);          else  if (prim->getName()== "back") _backPrimitiveSetList.push_back(prim);          else  if (prim->getName()== "wall") _wallPrimitiveSetList.push_back(prim);     } } bool GlyphGeometry::match( const Style* style)  const {      if (_style == style)  return  true;      if (!_style || !style)  return  false;      return (*_style==*style); }

         接着又是漫长的编译过程~

         现在osg for android应该能够正确显示文字了，下面给出osg创建文字代码

 C++ Code 

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osg::ref_ptr OsgMainApp::createTextNode() {     setlocale(LC_ALL, "chs");     std::string textConvert =  "osg for android 中文显示示例";     osgText::Font* fontHei = osgText::readFontFile( "/sdcard/osg/simfang.ttf");     osg::ref_ptr text =  new osgText::Text;     text->setFont(fontHei);     text->setText(textConvert, osgText::String::ENCODING_UTF8);     text->setCharacterSize(40.0f);  //字体大小     text->setPosition(osg::Vec3( 0. 0,  0. 0, - 80.0f));     text->setAutoRotateToScreen( true);     osg::ref_ptr geode =  new osg::Geode;     geode->addDrawable(             osg::createTexturedQuadGeometry(osg::Vec3(- 150. 0,  1. 0, - 130. 0),                     osg::Vec3( 300. 0,  0. 0,  0. 0), osg::Vec3( 0. 0,  0. 0,  200. 0),  1. 0,                      1. 0));      geode->addDrawable(text.get());     osg::Drawable* geom = geode->getDrawable( 1);     osg::Uniform* samUniform =  new osg::Uniform(osg::Uniform::SAMPLER_2D,              "GlyphTexture");     samUniform->set( 0);  //设置纹理单元     osg::StateSet * ss = geom->getOrCreateStateSet();  //->getStateSet();     ss->addUniform(samUniform);     osg::Program * program =  new osg::Program;     program->addShader( new osg::Shader(osg::Shader::FRAGMENT, fragShader));     program->addShader( new osg::Shader(osg::Shader::VERTEX, vertexShader));     ss->setAttribute(program);      return geode;

  

          shader代码

 C++ Code 

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static  const  char vertexShader[] =          "varying vec2 texcoord1;                                \n"          "void main(void ){                                      \n"          "texcoord1 = gl_MultiTexCoord0.st;                      \n"          "gl_Position = ftransform();                            \n"          "}                                                      \n"; static  const  char fragShader[] =          "varying mediump vec2 texcoord1;                        \n"          "uniform sampler2D GlyphTexture;                        \n"          "void main(void){                                       \n"          " gl_FragColor = texture2D(GlyphTexture, texcoord1);    \n"          "}                                                      \n";

         这个时候还不能显示中文，必须在android.mk文件加入freetype库的支持，很奇怪的是加入-losgdb_freetype，然后在OsgMainApp.h加入USE_OSGPLUGIN(freetype)这两句代码，这个时候报错：

 C++ Code 

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D:/NDK/android-ndk-r10b/toolchains/arm-linux-androideabi- 4. 6/prebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/ 4. 6/../../../../arm-linux-androideabi/bin/ld.exe: C:/Develop/osggles2/obj/local/armeabi/libosgdb_freetype.a(FreeTypeLibrary.o): in function FreeTypeLibrary::verifyCharacterMap(FT_FaceRec_*):D:/NDK/OSG/OpenSceneGraph- 3. 0. 1/src/osgPlugins/freetype/FreeTypeLibrary.cpp: 198: error: undefined reference to  'FT_Set_Charmap' D:/NDK/android-ndk-r10b/toolchains/arm-linux-androideabi- 4. 6/prebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/ 4. 6/../../../../arm-linux-androideabi/bin/ld.exe: C:/Develop/osggles2/obj/local/armeabi/libosgdb_freetype.a(FreeTypeLibrary.o): in function FreeTypeLibrary::getFace(std::string  const&,  unsigned  int, FT_FaceRec_*&):D:/NDK/OSG/OpenSceneGraph- 3. 0. 1/src/osgPlugins/freetype/FreeTypeLibrary.cpp: 65: error: undefined reference to  'FT_New_Face' *********

        还好在这里找到了解决的方法，非常感谢，毕竟中文显示上国外论坛也找不到解决的方法:) 在这里需要注意的一点是：添加的-lft2 \ 这句代码必须放到-losgdb_freetype \的后面，否则仍旧会出现上面的错误。接下来是很顺利的显示中文了