source: orxonox.OLD/orxonox/branches/textEngine/src/lib/graphics/font/glfont.cc @ 3682

/* 
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...

   ***
   * This file is extended to the needs of the orxonox-project.         *
   * the Copyright of the original file is below this copyright         *
   *                                                                  ***

*/

/*
    glfont:  An example of using the SDL_ttf library with OpenGL.
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    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 GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    The SDL_GL_* functions in this file are available in the public domain.

    Sam Lantinga
    slouken@libsdl.org
*/

#include "glfont.h"



#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <SDL/SDL.h>
#include <SDL/SDL_ttf.h>

#include "glincl.h"
#include "debug.h"


#define DEFAULT_PTSIZE  18
#define DEFAULT_TEXT    "orxonox 1234567890"
#define NUM_COLORS      256



GLFont::GLFont()
{
  this->init("");

}
GLFont::GLFont(const char* fontFile)
{
  this->init(fontFile);
}
GLFont::~GLFont()
{
  
}

bool GLFont::init(const char* fontFile)
{
  // setting default values.
  renderStyle = TTF_STYLE_NORMAL;


  // Initializing lib-TTF if necesary.
  if (TTF_WasInit() && TTF_Init() < 0 ) 
    {
      PRINTF(1)("Couldn't initialize TTF: %s\n", SDL_GetError());
      return false;
    }
}

bool GLFont::ttfInitialized = false;

bool GLFont::setFont(const char* fonFile)
{

}
void GLFont::setText(const char* text)
{

}

void GLFont::setStyle(char* style)
{
  renderStyle = TTF_STYLE_NORMAL;
  
  for (int i = 0; i < strlen(style); i++)
    if (strncmp(style+i, "b", 1) == 0) 
      this->renderStyle |= TTF_STYLE_BOLD;
    else if (strncmp(style+i, "i", 1) == 0)
      this->renderStyle |= TTF_STYLE_ITALIC;
    else if (strncmp(style+i, "u", 1) == 0) 
      this->renderStyle |= TTF_STYLE_UNDERLINE;

  // TTF_SetFontStyle(font, renderstyle);

}
void GLFont::setSize(void)
{

}
void GLFont::setPosition(int x, int y)
{

}

void GLFont::renderText(void)
{

}
void GLFont::renderText(const char* text, int x, int y)
{
  // enter the 2D-Mode

  SDL_Surface *screen = SDL_GetVideoSurface();
  
  /* Note, there may be other things you need to change,
     depending on how you have your OpenGL state set up.
  */
  glPushAttrib(GL_ENABLE_BIT);
  glDisable(GL_DEPTH_TEST);
  glDisable(GL_CULL_FACE);
  glEnable(GL_TEXTURE_2D);
  
  /* This allows alpha blending of 2D textures with the scene */
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  
  glViewport(0, 0, screen->w, screen->h);
  
  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();
  
  glOrtho(0.0, (GLdouble)screen->w, (GLdouble)screen->h, 0.0, 0.0, 1.0);
  
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  glLoadIdentity();
  
  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);





  // Leave the 2D-Mode
  glMatrixMode(GL_MODELVIEW);
  glPopMatrix();
  
  glMatrixMode(GL_PROJECTION);
  glPopMatrix();
  
  glPopAttrib();
}


bool GLFont::loadTexture()
{
  int w, h;
  SDL_Surface *image;
  SDL_Rect area;
  Uint32 saved_flags;
  Uint8  saved_alpha;
  
  /* Use the surface width and height expanded to powers of 2 */
  w = powerOfTwo(surface->w);
  h = powerOfTwo(surface->h);
  texcoord[0] = 0.0f;                   /* Min X */
  texcoord[1] = 0.0f;                   /* Min Y */
  texcoord[2] = (GLfloat)surface->w / w;        /* Max X */
  texcoord[3] = (GLfloat)surface->h / h;        /* Max Y */
  
  image = SDL_CreateRGBSurface(
                               SDL_SWSURFACE,
                               w, h,
                               32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
                               0x000000FF, 
                               0x0000FF00, 
                               0x00FF0000, 
                               0xFF000000
#else
                               0xFF000000,
                               0x00FF0000, 
                               0x0000FF00, 
                               0x000000FF
#endif
                               );
  if ( image == NULL ) {
    return 0;
  }
  
  /* Save the alpha blending attributes */
  saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
  saved_alpha = surface->format->alpha;
  if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
    SDL_SetAlpha(surface, 0, 0);
  }
  
  /* Copy the surface into the GL texture image */
  area.x = 0;
  area.y = 0;
  area.w = surface->w;
  area.h = surface->h;
  SDL_BlitSurface(surface, &area, image, &area);
  
  /* Restore the alpha blending attributes */
  if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
    SDL_SetAlpha(surface, saved_flags, saved_alpha);
  }
  
  /* Create an OpenGL texture for the image */
  glGenTextures(1, &texture);
  glBindTexture(GL_TEXTURE_2D, texture);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexImage2D(GL_TEXTURE_2D,
               0,
               GL_RGBA,
               w, h,
               0,
               GL_RGBA,
               GL_UNSIGNED_BYTE,
               image->pixels);
  SDL_FreeSurface(image); /* No longer needed */
  
  //  return texture;
}

/* Quick utility function for texture creation */
int GLFont::powerOfTwo(int input)
{
  int value = 1;
  
  while ( value < input ) {
    value <<= 1;
  }
  return value;
}


/*
private:
char* fontFile;
char* text;
int positionX;
int positionY;
*/




char Usage[100] = "orxonox test" ;
void GLFont::enter2DMode()
{
  SDL_Surface *screen = SDL_GetVideoSurface();
  
  /* Note, there may be other things you need to change,
     depending on how you have your OpenGL state set up.
  */
  glPushAttrib(GL_ENABLE_BIT);
  glDisable(GL_DEPTH_TEST);
  glDisable(GL_CULL_FACE);
  glEnable(GL_TEXTURE_2D);
  
  /* This allows alpha blending of 2D textures with the scene */
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  
  glViewport(0, 0, screen->w, screen->h);
  
  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();
  
  glOrtho(0.0, (GLdouble)screen->w, (GLdouble)screen->h, 0.0, 0.0, 1.0);
  
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  glLoadIdentity();
  
  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}


void GLFont::leave2DMode()
{
        glMatrixMode(GL_MODELVIEW);
        glPopMatrix();

        glMatrixMode(GL_PROJECTION);
        glPopMatrix();

        glPopAttrib();
}


GLuint GLFont::loadTexture(SDL_Surface *surface, GLfloat *texcoord)
{
  GLuint texture;
  int w, h;
  SDL_Surface *image;
  SDL_Rect area;
  Uint32 saved_flags;
  Uint8  saved_alpha;
  
  /* Use the surface width and height expanded to powers of 2 */
  w = power_of_two(surface->w);
  h = power_of_two(surface->h);
  texcoord[0] = 0.0f;                   /* Min X */
  texcoord[1] = 0.0f;                   /* Min Y */
  texcoord[2] = (GLfloat)surface->w / w;        /* Max X */
  texcoord[3] = (GLfloat)surface->h / h;        /* Max Y */
  
  image = SDL_CreateRGBSurface(
                               SDL_SWSURFACE,
                               w, h,
                               32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
                               0x000000FF, 
                               0x0000FF00, 
                               0x00FF0000, 
                               0xFF000000
#else
                               0xFF000000,
                               0x00FF0000, 
                               0x0000FF00, 
                               0x000000FF
#endif
                               );
  if ( image == NULL ) {
    return 0;
  }
  
  /* Save the alpha blending attributes */
  saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
  saved_alpha = surface->format->alpha;
  if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
    SDL_SetAlpha(surface, 0, 0);
  }
  
  /* Copy the surface into the GL texture image */
  area.x = 0;
  area.y = 0;
  area.w = surface->w;
  area.h = surface->h;
  SDL_BlitSurface(surface, &area, image, &area);
  
  /* Restore the alpha blending attributes */
  if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
    SDL_SetAlpha(surface, saved_flags, saved_alpha);
  }
  
  /* Create an OpenGL texture for the image */
  glGenTextures(1, &texture);
  glBindTexture(GL_TEXTURE_2D, texture);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexImage2D(GL_TEXTURE_2D,
               0,
               GL_RGBA,
               w, h,
               0,
               GL_RGBA,
               GL_UNSIGNED_BYTE,
               image->pixels);
  SDL_FreeSurface(image); /* No longer needed */
  
  return texture;
}


/* Quick utility function for texture creation */
int GLFont::power_of_two(int input)
{
  int value = 1;
  
  while ( value < input ) {
    value <<= 1;
  }
  return value;
}