TextureFont.cpp

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#include "GlobalParameters.h"
#include "TextureFont.h"
#include "Textures.h"

TextureFont::TextureFont( GLuint texindex ) {
  texture = texindex; // texture index for the font texture
  count = 0;
  m_size = 0;
}

TextureFont::~TextureFont(void) {
  this->killFont();
}

GLvoid TextureFont::buildFont( GLuint cpl, GLuint cpr, GLuint size, GLuint targetsize, GLuint skipspace ) {
  m_width = skipspace;
  m_size = targetsize;
  float cx;                             // character x coordinates
  float cy;                             // character y coordinates

  count = cpr  * cpl;
  base = glGenLists( count );                            // create a display list big enough for all characters
  //glBindTexture( GL_TEXTURE_2D, texture );                // select the font texture
   Textures::getTextures()->bindTexture( texture );

  for( unsigned int i=0; i < count; i++ ) {
    cx = float(i%size)/(float)cpl;           // x position of current character (left)
    cy = float(i/size)/(float)cpr;                  // y position of current character (top)    

    glNewList( base + i, GL_COMPILE );              // create a listelement

    glBegin( GL_QUADS );                    // each character is a quad
    glTexCoord2f( cx, 1-cy-(1/(float)cpr) );            // texture coordinates bottom left
    glVertex2i( 0, 0 );             // vertex coordinates bottom left
    glTexCoord2f( cx + (1/(float)cpl), 1-cy-(1/(float)cpr));    // texture coordinates bottom right
    glVertex2i( targetsize, 0 );                // vertex coordinates bottom right
    glTexCoord2f( cx + (1/(float)cpl), 1-cy);           // texture coordinates top right
    glVertex2i( targetsize, targetsize );               // vertex coordinates top right
    glTexCoord2f( cx, 1-cy );                // texture coordinates top left
    glVertex2i( 0, targetsize );                // vertex coordinates top left
    glEnd();

    glTranslated( skipspace, 0, 0 );    // each character is only 10 pixels wide, move to the right
    glEndList();                             // finish list
  }
}

unsigned int TextureFont::getSize( void ) { 
  return m_size;
}

unsigned int TextureFont::getWidth( void ) {
  return m_width;
}

GLvoid TextureFont::killFont( GLvoid ) {
  glDeleteLists( base, count );                     // delete all caracters
}


GLvoid TextureFont::print( int x, int y, const char *string, ... ) {
  char text[256];               // created string
  va_list ap;                   // pointer to list of arguments

  if( string == NULL )// quit, if there is no texst
    return;

  va_start( ap, string );                   // parse the string for variables
  vsprintf_s( text, string, ap );       // convert symbols to actual numbers
  va_end( ap );                      // store results in text

  //glBindTexture( GL_TEXTURE_2D, texture );                // select font texture
   Textures::getTextures()->bindTexture( texture );

  glPushMatrix();
  glPushAttrib( GL_LIST_BIT );              // push display list bits
  glTranslated( x, y, 0 );                          // textposition (0,0 - Bottom Left)
  glListBase( base - 32 );

  glCallLists( (int)strlen(text), GL_UNSIGNED_BYTE, text );         // print text to screen
  glPopAttrib();
  glPopMatrix();
}


void TextureFont::print( int x, int y, const std::string *text ) {
  print(x, y, text->c_str());
}