demos/c_simple/SDL_glue.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2010 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2013 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26  /*
  27
  28    This example shows how to mix SDL with GFXprim.
  29
  30   */
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <SDL/SDL.h>
  35 #include <GP.h>
  36 #include <backends/GP_SDL_Pixmap.h>
  37
  38 #define W 320
  39 #define H 240
  40
  41 static SDL_Surface *display = NULL;
  42 static GP_Pixmap pixmap;
  43
  44 static GP_Pixel black_pixel, darkgray_pixel;
  45
  46 void redraw_screen(void)
  47 {
  48         SDL_LockSurface(display);
  49
  50         GP_Fill(&pixmap, black_pixel);
  51
  52         GP_Text(&pixmap, NULL, W/2, 20, GP_ALIGN_CENTER | GP_VALIGN_BELOW,
  53                 darkgray_pixel, black_pixel, "GFXprim SDL Demo");
  54
  55         GP_Line(&pixmap, 0, 0, W-1, H-1, darkgray_pixel);
  56         GP_Line(&pixmap, 0, H-1, W-1, 0, darkgray_pixel);
  57
  58         SDL_UnlockSurface(display);
  59 }
  60
  61 void event_loop(void)
  62 {
  63         SDL_Event event;
  64
  65         while (SDL_WaitEvent(&event) > 0) {
  66                 switch (event.type) {
  67
  68                 case SDL_VIDEOEXPOSE:
  69                         redraw_screen();
  70                         SDL_Flip(display);
  71                 break;
  72
  73                 case SDL_KEYDOWN:
  74                         switch (event.key.keysym.sym) {
  75                         case SDLK_ESCAPE:
  76                                 return;
  77                         default:
  78                         break;
  79                         }
  80                 break;
  81
  82                 case SDL_QUIT:
  83                         return;
  84                 }
  85         }
  86 }
  87
  88 int main(void)
  89 {
  90         if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0) {
  91                 fprintf(stderr, "Could not initialize SDL: %s\n", SDL_GetError());
  92                 return 1;
  93         }
  94
  95         display = SDL_SetVideoMode(W, H, 0, SDL_SWSURFACE);
  96
  97         if (display == NULL) {
  98                 fprintf(stderr, "Could not open display: %s\n", SDL_GetError());
  99                 SDL_Quit();
 100                 return 1;
 101         }
 102
 103         GP_PixmapFromSDLSurface(&pixmap, display);
 104
 105         black_pixel     = GP_RGBToPixmapPixel(0x00, 0x00, 0x00, &pixmap);
 106         darkgray_pixel  = GP_RGBToPixmapPixel(0x7f, 0x7f, 0x7f, &pixmap);
 107
 108         redraw_screen();
 109         SDL_Flip(display);
 110
 111         event_loop();
 112
 113         SDL_Quit();
 114         return 0;
 115 }
 116