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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 "glutint.h"
#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);
}
}
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