utexfont.hpp

/* Copyright (c) Mark J. Kilgard, 1997. */

/* This program is freely distributable without licensing fees  and is
   provided without guarantee or warrantee expressed or  implied. This
   program is -not- in the public domain.
 */
//NB: we added a "u" prefix to avoid name collisions.

#ifdef HAVE_GL

#ifndef _utexfont_hpp_
#define _utexfont_hpp_

#include <GL/gl.h>
#include <ubit/ubrick.hpp>
#include <ubit/unatgraph.hpp>
namespace ubit {

#define UTXF_FORMAT_BYTE        0
#define UTXF_FORMAT_BITMAP      1

/* ==================================================== ======== ======= */

struct UTexGlyphInfo {
  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 UTexGlyphVertexInfo {
  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 UTexFont {
  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;
  UTexGlyphInfo* tgi;
  UTexGlyphVertexInfo *tgvi;
  UTexGlyphVertexInfo **lut;
};

/* ==================================================== ======== ======= */

UTexFont* utxfLoadFont(Display*, Font fid);

void utxfUnloadFont(UTexFont*);

GLuint utxfEstablishTexture(UTexFont*, GLuint texobj, GLboolean setupMipmaps);

void utxfBindFontTexture(UTexFont*);

void utxfRenderString(UTexFont*, const char* string, int len);

void utxfGetStringMetrics(UTexFont*, const char* string, int len,
                          int* pwidth, int* pmax_ascent, int* pmax_descent);
                          
}

#endif
#endif
/* ==================================================== ======== ======= */

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