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flightgear/3rdparty/fonts/fntTXF.cxx

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/*
PLIB - A Suite of Portable Game Libraries
Copyright (C) 1998,2002 Steve Baker
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 Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For further information visit http://plib.sourceforge.net
$Id: fntTXF.cxx 1735 2002-12-01 18:21:48Z sjbaker $
*/
#include "fntLocal.h"
#include <simgear/debug/logstream.hxx>
#include <simgear/misc/sg_path.hxx>
FILE *_fntCurrImageFd ;
int _fntIsSwapped = FALSE ;
static void tex_make_mip_maps ( GLubyte *image, int xsize,
int ysize, int zsize )
{
GLubyte *texels [ 20 ] ; /* One element per level of MIPmap */
for ( int l = 0 ; l < 20 ; l++ )
texels [ l ] = NULL ;
texels [ 0 ] = image ;
int lev ;
for ( lev = 0 ; (( xsize >> (lev+1) ) != 0 ||
( ysize >> (lev+1) ) != 0 ) ; lev++ )
{
/* Suffix '1' is the higher level map, suffix '2' is the lower level. */
int l1 = lev ;
int l2 = lev+1 ;
int w1 = xsize >> l1 ;
int h1 = ysize >> l1 ;
int w2 = xsize >> l2 ;
int h2 = ysize >> l2 ;
if ( w1 <= 0 ) w1 = 1 ;
if ( h1 <= 0 ) h1 = 1 ;
if ( w2 <= 0 ) w2 = 1 ;
if ( h2 <= 0 ) h2 = 1 ;
texels [ l2 ] = new GLubyte [ w2 * h2 * zsize ] ;
for ( int x2 = 0 ; x2 < w2 ; x2++ )
for ( int y2 = 0 ; y2 < h2 ; y2++ )
for ( int c = 0 ; c < zsize ; c++ )
{
int x1 = x2 + x2 ;
int x1_1 = ( x1 + 1 ) % w1 ;
int y1 = y2 + y2 ;
int y1_1 = ( y1 + 1 ) % h1 ;
int t1 = texels [ l1 ] [ (y1 * w1 + x1 ) * zsize + c ] ;
int t2 = texels [ l1 ] [ (y1_1 * w1 + x1 ) * zsize + c ] ;
int t3 = texels [ l1 ] [ (y1 * w1 + x1_1) * zsize + c ] ;
int t4 = texels [ l1 ] [ (y1_1 * w1 + x1_1) * zsize + c ] ;
texels [ l2 ] [ (y2 * w2 + x2) * zsize + c ] =
( t1 + t2 + t3 + t4 ) / 4 ;
}
}
texels [ lev+1 ] = NULL ;
if ( ! ((xsize & (xsize-1))==0) ||
! ((ysize & (ysize-1))==0) )
{
fntSetError ( SG_ALERT,
"TXFloader: TXF Map is not a power-of-two in size!" ) ;
}
glPixelStorei ( GL_UNPACK_ALIGNMENT, 1 ) ;
int map_level = 0 ;
#ifdef PROXY_TEXTURES_ARE_NOT_BROKEN
int ww ;
do
{
glTexImage2D ( GL_PROXY_TEXTURE_2D,
map_level, zsize, xsize, ysize, FALSE /* Border */,
(zsize==1)?GL_LUMINANCE:
(zsize==2)?GL_LUMINANCE_ALPHA:
(zsize==3)?GL_RGB:
GL_RGBA,
GL_UNSIGNED_BYTE, NULL ) ;
glGetTexLevelParameteriv ( GL_PROXY_TEXTURE_2D, 0,GL_TEXTURE_WIDTH, &ww ) ;
if ( ww == 0 )
{
delete [] texels [ 0 ] ;
xsize >>= 1 ;
ysize >>= 1 ;
for ( int l = 0 ; texels [ l ] != NULL ; l++ )
texels [ l ] = texels [ l+1 ] ;
if ( xsize < 64 && ysize < 64 )
{
fntSetError ( SG_ALERT,
"FNT: OpenGL will not accept a font texture?!?" ) ;
}
}
} while ( ww == 0 ) ;
#endif
for ( int i = 0 ; texels [ i ] != NULL ; i++ )
{
int w = xsize>>i ;
int h = ysize>>i ;
if ( w <= 0 ) w = 1 ;
if ( h <= 0 ) h = 1 ;
glTexImage2D ( GL_TEXTURE_2D,
map_level, zsize, w, h, FALSE /* Border */,
(zsize==1)?GL_LUMINANCE:
(zsize==2)?GL_LUMINANCE_ALPHA:
(zsize==3)?GL_RGB:
GL_RGBA,
GL_UNSIGNED_BYTE, (GLvoid *) texels[i] ) ;
map_level++ ;
delete [] texels [ i ] ;
}
}
int fntTexFont::loadTXF ( const SGPath& path, GLenum mag, GLenum min )
{
FILE *fd ;
const auto ps = path.utf8Str();
#if defined(SG_WINDOWS)
std::wstring fp = path.wstr();
fd = _wfopen(fp.c_str(), L"rb");
#else
fd = fopen(ps.c_str(), "rb");
#endif
if ( fd == nullptr )
{
fntSetError ( SG_WARN,
"fntLoadTXF: Failed to open '%s' for reading.", ps.c_str() ) ;
return FNT_FALSE ;
}
_fntCurrImageFd = fd ;
unsigned char magic [ 4 ] ;
if ( (int)fread ( &magic, sizeof (unsigned int), 1, fd ) != 1 )
{
fntSetError ( SG_WARN,
"fntLoadTXF: '%s' an empty file!", ps.c_str() ) ;
return FNT_FALSE ;
}
if ( magic [ 0 ] != 0xFF || magic [ 1 ] != 't' ||
magic [ 2 ] != 'x' || magic [ 3 ] != 'f' )
{
fntSetError ( SG_WARN,
"fntLoadTXF: '%s' is not a 'txf' font file.", ps.c_str() ) ;
return FNT_FALSE ;
}
_fntIsSwapped = FALSE ;
int endianness = _fnt_readInt () ;
_fntIsSwapped = ( endianness != 0x12345678 ) ;
int format = _fnt_readInt () ;
int tex_width = _fnt_readInt () ;
int tex_height = _fnt_readInt () ;
int max_height = _fnt_readInt () ;
_fnt_readInt () ;
int num_glyphs = _fnt_readInt () ;
int w = tex_width ;
int h = tex_height ;
float xstep = 0.5f / (float) w ;
float ystep = 0.5f / (float) h ;
int i, j ;
/*
Load the TXF_Glyph array
*/
TXF_Glyph glyph ;
for ( i = 0 ; i < num_glyphs ; i++ )
{
glyph . ch = _fnt_readShort () ;
glyph . w = _fnt_readByte () ;
glyph . h = _fnt_readByte () ;
glyph . x_off = _fnt_readByte () ;
glyph . y_off = _fnt_readByte () ;
glyph . step = _fnt_readByte () ;
glyph . unknown = _fnt_readByte () ;
glyph . x = _fnt_readShort () ;
glyph . y = _fnt_readShort () ;
setGlyph ( (char) glyph.ch,
(float) glyph.step / (float) max_height,
(float) glyph.x / (float) w + xstep,
(float)( glyph.x + glyph.w ) / (float) w + xstep,
(float) glyph.y / (float) h + ystep,
(float)( glyph.y + glyph.h ) / (float) h + ystep,
(float) glyph.x_off / (float) max_height,
(float)( glyph.x_off + glyph.w ) / (float) max_height,
(float) glyph.y_off / (float) max_height,
(float)( glyph.y_off + glyph.h ) / (float) max_height ) ;
}
exists [ static_cast<int>(' ') ] = FALSE ;
/*
Load the image part of the file
*/
int ntexels = w * h ;
unsigned char *teximage ;
unsigned char *texbitmap ;
switch ( format )
{
case FNT_BYTE_FORMAT:
{
unsigned char *orig = new unsigned char [ ntexels ] ;
if ( (int)fread ( orig, 1, ntexels, fd ) != ntexels )
{
fntSetError ( SG_WARN,
"fntLoadTXF: Premature EOF in '%s'.", ps.c_str() ) ;
return FNT_FALSE ;
}
teximage = new unsigned char [ 2 * ntexels ] ;
for ( i = 0 ; i < ntexels ; i++ )
{
teximage [ i*2 ] = orig [ i ] ;
teximage [ i*2 + 1 ] = orig [ i ] ;
}
delete [] orig ;
}
break ;
case FNT_BITMAP_FORMAT:
{
int stride = (w + 7) >> 3;
texbitmap = new unsigned char [ stride * h ] ;
if ( (int)fread ( texbitmap, 1, stride * h, fd ) != stride * h )
{
delete [] texbitmap ;
fntSetError ( SG_WARN,
"fntLoadTXF: Premature EOF in '%s'.", ps.c_str() ) ;
return FNT_FALSE ;
}
teximage = new unsigned char [ 2 * ntexels ] ;
for ( i = 0 ; i < 2 * ntexels ; i++ )
teximage [ i ] = 0 ;
for (i = 0; i < h; i++)
for (j = 0; j < w; j++)
if (texbitmap[i * stride + (j >> 3)] & (1 << (j & 7)))
{
teximage[(i * w + j) * 2 ] = 255;
teximage[(i * w + j) * 2 + 1] = 255;
}
delete [] texbitmap ;
}
break ;
default:
fntSetError ( SG_WARN,
"fntLoadTXF: Unrecognised format type in '%s'.", ps.c_str() ) ;
return FNT_FALSE ;
}
fclose ( fd ) ;
fixed_pitch = FALSE ;
#ifdef GL_VERSION_1_1
glGenTextures ( 1, & texture ) ;
glBindTexture ( GL_TEXTURE_2D, texture ) ;
#else
/* This is only useful on some ancient SGI hardware */
glGenTexturesEXT ( 1, & texture ) ;
glBindTextureEXT ( GL_TEXTURE_2D, texture ) ;
#endif
tex_make_mip_maps ( teximage, w, h, 2 ) ;
glTexEnvi ( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag ) ;
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min ) ;
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP ) ;
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP ) ;
#ifdef GL_VERSION_1_1
glBindTexture ( GL_TEXTURE_2D, 0 ) ;
#else
glBindTextureEXT ( GL_TEXTURE_2D, 0 ) ;
#endif
return FNT_TRUE ;
}
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