Subversion Repositories shark

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
55 pj 1
 
2
/* Copyright (c) Mark J. Kilgard, 1994. */
3
 
4
/* This program is freely distributable without licensing fees
5
   and is provided without guarantee or warrantee expressed or
6
   implied. This program is -not- in the public domain. */
7
 
8
#include "glutbitmap.h"
9
 
10
void APIENTRY
11
glutBitmapCharacter(GLUTbitmapFont font, int c)
12
{
13
  const BitmapCharRec *ch;
14
  BitmapFontPtr fontinfo;
15
  GLint swapbytes, lsbfirst, rowlength;
16
  GLint skiprows, skippixels, alignment;
17
 
18
#if defined(_WIN32)
19
  fontinfo = (BitmapFontPtr) __glutFont(font);
20
#else
21
  fontinfo = (BitmapFontPtr) font;
22
#endif
23
 
24
  if (c < fontinfo->first ||
25
    c >= fontinfo->first + fontinfo->num_chars)
26
    return;
27
  ch = fontinfo->ch[c - fontinfo->first];
28
  if (ch) {
29
    /* Save current modes. */
30
    glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
31
    glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
32
    glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
33
    glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
34
    glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
35
    glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
36
    /* Little endian machines (DEC Alpha for example) could
37
       benefit from setting GL_UNPACK_LSB_FIRST to GL_TRUE
38
       instead of GL_FALSE, but this would require changing the
39
       generated bitmaps too. */
40
    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
41
    glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
42
    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
43
    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
44
    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
45
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
46
    glBitmap(ch->width, ch->height, ch->xorig, ch->yorig,
47
      ch->advance, 0, ch->bitmap);
48
    /* Restore saved modes. */
49
    glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
50
    glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
51
    glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
52
    glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
53
    glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
54
    glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
55
  }
56
}