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/* 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 "glutbitmap.h"

void APIENTRY

glutBitmapCharacter(GLUTbitmapFont font, int c)

{

  const BitmapCharRec *ch;

  BitmapFontPtr fontinfo;

  GLint swapbytes, lsbfirst, rowlength;

  GLint skiprows, skippixels, alignment;

#if defined(_WIN32)

  fontinfo = (BitmapFontPtr) __glutFont(font);

#else

  fontinfo = (BitmapFontPtr) font;

#endif

  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);

  }

}