text.h

S.C.O.U.R.G.E.是一款类似Rogue的游戏

/**
 * This code was originally written by Mark Kilgard ([e-mail]) (c) 1997
 * see: http://www.opengl.org/developers/code/mjktips/TexFont/TexFont.html
 */

/***************************************************************************
                          text.h  -  description
                             -------------------
    begin                : Mon Jul 7 2003
    copyright            : (C) 2003 by Gabor Torok
    email                : [e-mail]
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef TEXT_H
#define TEXT_H

#include "constants.h"

/**
  *@author Gabor Torok
  */      

#define TXF_FORMAT_BYTE		0
#define TXF_FORMAT_BITMAP	1

struct TexGlyphInfo {
  unsigned short c;       /* Potentially support 16-bit glyphs. */
  unsigned char width;
  unsigned char height;
  signed char xoffset;
  signed char yoffset;
  signed char advance;
  char dummy;           /* Space holder for alignment reasons. */
  short x;
  short y;
};

struct TexGlyphVertexInfo {
  GLfloat t0[2];
  GLshort v0[2];
  GLfloat t1[2];
  GLshort v1[2];
  GLfloat t2[2];
  GLshort v2[2];
  GLfloat t3[2];
  GLshort v3[2];
  GLfloat advance;
};

struct TexFont {
  GLuint texobj;
  int tex_width;
  int tex_height;
  int max_ascent;
  int max_descent;
  int num_glyphs;
  int min_glyph;
  int range;
  unsigned char *teximage;
  TexGlyphInfo *tgi;
  TexGlyphVertexInfo *tgvi;
  TexGlyphVertexInfo **lut;
};

enum {
  MONO, TOP_BOTTOM, LEFT_RIGHT, FOUR
};

/* byte swap a 32-bit value */
#define SWAPL(x, n) { \
                 n = ((char *) (x))[0];\
                 ((char *) (x))[0] = ((char *) (x))[3];\
                 ((char *) (x))[3] = n;\
                 n = ((char *) (x))[1];\
                 ((char *) (x))[1] = ((char *) (x))[2];\
                 ((char *) (x))[2] = n; }

/* byte swap a short */
#define SWAPS(x, n) { \
                 n = ((char *) (x))[0];\
                 ((char *) (x))[0] = ((char *) (x))[1];\
                 ((char *) (x))[1] = n; }
        
class TexturedText  {
private:

char *lastError;
int useLuminanceAlpha;
char filename[300];
TexFont *txf;

public:
	TexturedText();
	~TexturedText();


    inline char *txfErrorString() { return lastError; }


    TexFont *txfLoadFont(char *filename);

    void txfUnloadFont();

    GLuint txfEstablishTexture(GLuint texobj,
                               GLboolean setupMipmaps);

    void txfBindFontTexture();

    void txfGetStringMetrics(char *string,                
                             int len,
                             int *width,
                             int *max_ascent,
                             int *max_descent);

    void txfRenderGlyph(int c);

    void txfRenderString(char *string,
                         int len);

    void txfRenderFancyString(char *string,
                              int len);

private:
    TexGlyphVertexInfo *getTCVI(int c);
    int txfInFont(int c);
};

#endif