src/glut/mini/bitmap.c

   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   GLfloat swapbytes, lsbfirst, rowlength;
  16   GLfloat 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 /*     glGetFloatv(GL_UNPACK_SWAP_BYTES, &swapbytes); */
  31 /*     glGetFloatv(GL_UNPACK_LSB_FIRST, &lsbfirst); */
  32 /*     glGetFloatv(GL_UNPACK_ROW_LENGTH, &rowlength); */
  33 /*     glGetFloatv(GL_UNPACK_SKIP_ROWS, &skiprows); */
  34 /*     glGetFloatv(GL_UNPACK_SKIP_PIXELS, &skippixels); */
  35        glGetFloatv(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, (int)lsbfirst); */
  51 /*     glPixelStorei(GL_UNPACK_ROW_LENGTH, (int)rowlength); */
  52 /*     glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows); */
  53 /*     glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels); */
  54      glPixelStorei(GL_UNPACK_ALIGNMENT, (int)alignment);
  55   }
  56 }