
/* Copyright (c) Mark J. Kilgard, 1994. */

/* 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. */

#include <GL/glut.h>
#include "glutint.h"
#include "glutbitmap.h"

void
glutBitmapCharacter(GLUTbitmapFont font, int c)
{
  BitmapCharPtr ch;
  BitmapFontPtr fontinfo = (BitmapFontPtr) font;
  GLint swapbytes, lsbfirst, rowlength;
  GLint skiprows, skippixels, alignment;

  if (c < fontinfo->first ||
    c >= fontinfo->first + fontinfo->num_chars)
    return;
  ch = fontinfo->ch[c - fontinfo->first];
  if (ch) {
    /* save current modes */
    glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
    glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
    glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
    glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
    glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
    glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
    /* Little endian machines (DEC Alpha for example) could
       benefit from setting GL_UNPACK_LSB_FIRST to GL_TRUE
       instead of GL_FALSE, but this would require changing the
       generated bitmaps too. */
    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
    glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    glBitmap(ch->width, ch->height, ch->xorig, ch->yorig,
      ch->advance, 0, ch->bitmap);
    /* restore saved modes */
    glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
    glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
    glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
    glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
    glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
    glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
  }
}
