extruec.c from Allegro game programming library at Krugle

Show extruec.c syntax highlighted

/*
 *    Example program for the Allegro library, by Shawn Hargreaves.
 *
 *    This program shows how to specify colors in the various different
 *    truecolor pixel formats.
 */


#include "allegro.h"



void test(int colordepth)
{
   AL_PALETTE pal;
   int x;

   /* set the al_screen mode */
   al_set_color_depth(colordepth);

   if (al_set_gfx_mode(AL_GFX_AUTODETECT, 640, 480, 0, 0) != 0)
      return;

   /* in case this is a 256 color mode, we'd better make sure that the
    * palette is set to something sensible. This function generates a
    * standard palette with a nice range of different colors...
    */
   al_generate_332_palette(pal);
   al_set_palette(pal);

   al_acquire_screen();

   al_clear_to_color(al_screen, al_make_color(0, 0, 0));

   al_text_mode(-1);
   al_printf_text(al_screen, al_font_8x8, 0, 0, al_make_color(255, 255, 255), "%d bit color...", colordepth);

   /* use the al_make_color() function to specify AL_RGB values... */
   al_put_text(al_screen, al_font_8x8, "Red",     32, 80,  al_make_color(255, 0,   0  ));
   al_put_text(al_screen, al_font_8x8, "Green",   32, 100, al_make_color(0,   255, 0  ));
   al_put_text(al_screen, al_font_8x8, "Blue",    32, 120, al_make_color(0,   0,   255));
   al_put_text(al_screen, al_font_8x8, "Yellow",  32, 140, al_make_color(255, 255, 0  ));
   al_put_text(al_screen, al_font_8x8, "Cyan",    32, 160, al_make_color(0,   255, 255));
   al_put_text(al_screen, al_font_8x8, "Magenta", 32, 180, al_make_color(255, 0,   255));
   al_put_text(al_screen, al_font_8x8, "Grey",    32, 200, al_make_color(128, 128, 128));

   /* or we could draw some nice smooth color gradients... */
   for (x=0; x<256; x++) {
      al_draw_vline(al_screen, 192+x, 112, 176, al_make_color(x, 0, 0));
      al_draw_vline(al_screen, 192+x, 208, 272, al_make_color(0, x, 0));
      al_draw_vline(al_screen, 192+x, 304, 368, al_make_color(0, 0, x));
   }

   al_put_text_centre(al_screen, al_font_8x8, "<press a al_key>", AL_SCREEN_W/2, AL_SCREEN_H-16, al_make_color(255, 255, 255));

   al_release_screen();

   al_read_key();
}



int main()
{
   allegro_init();
   al_install_keyboard(); 

   /* try each of the possible possible color depths... */
   test(8);
   test(15);
   test(16);
   test(24);
   test(32);

   return 0;
}

AL_END_OF_MAIN();
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