old_tests/linefps.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) 2009-2010 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include <math.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <SDL/SDL.h>
  30
  31 #include "GP.h"
  32
  33 /* The surface used as a display (in fact it is a software surface). */
  34 SDL_Surface *display = NULL;
  35
  36 /* Frames per second. */
  37 int fps = 0, fps_min = 1000000, fps_max = 0;
  38
  39 /*
  40  * Timer used for FPS measurement and key reactions.
  41  * SDL_USEREVENT is triggered each second.
  42  */
  43
  44 SDL_TimerID timer;
  45
  46 SDL_UserEvent timer_event;
  47
  48 Uint32 timer_callback(__attribute__((unused)) Uint32 interval,
  49                         __attribute__((unused)) void * param)
  50 {
  51         timer_event.type = SDL_USEREVENT;
  52         SDL_PushEvent((SDL_Event *) &timer_event);
  53         return 1000;
  54 }
  55
  56 /* Values for color pixels in display format. */
  57 static long colors[GP_BASIC_COLOR_COUNT];
  58
  59 void draw_frame(void)
  60 {
  61         int x0 = 0;
  62         int y0 = random() % display->h;
  63         int x1 = display->w;
  64         int y1 = random() % display->h;
  65         long color = SDL_MapRGB(display->format, random() % 255, random() % 255, random() % 255);
  66
  67         GP_Line(display, color, x0, y0, x1, y1);
  68 }
  69
  70 void event_loop(void)
  71 {
  72         SDL_Event event;
  73
  74         for (;;) {
  75                 while (SDL_PollEvent(&event) > 0) {
  76                         switch (event.type) {
  77                                 case SDL_USEREVENT:
  78                                         SDL_Flip(display);
  79                                         fprintf(stdout, "%d FPS, min = %d, max = %d\r", fps, fps_min, fps_max);
  80                                         fflush(stdout);
  81
  82                                         /* Update frames per second */
  83                                         if (fps < fps_min)
  84                                                 fps_min = fps;
  85                                         if (fps > fps_max)
  86                                                 fps_max = fps;
  87                                         fps = 0;
  88                                         break;
  89                                 case SDL_KEYDOWN:
  90                                 case SDL_QUIT:
  91                                         return;
  92                         }
  93                 }
  94                 draw_frame();
  95                 fps++;
  96         }
  97 }
  98
  99 int main(void)
 100 {
 101         /* Initialize SDL */
 102         if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0) {
 103                 fprintf(stderr, "Could not initialize SDL: %s\n", SDL_GetError());
 104                 return 1;
 105         }
 106
 107         /* Create a window with a software back surface */
 108         display = SDL_SetVideoMode(640, 480, 0, SDL_SWSURFACE);
 109         if (display == NULL) {
 110                 fprintf(stderr, "Could not open display: %s\n", SDL_GetError());
 111                 goto fail;
 112         }
 113
 114         /* Print basic information about the surface */
 115         printf("Display surface properties:\n");
 116         printf("    width: %4d, height: %4d, pitch: %4d\n",
 117                display->w, display->h, display->pitch);
 118         printf("    bits per pixel: %2d, bytes per pixel: %2d\n",
 119                display->format->BitsPerPixel, display->format->BytesPerPixel);
 120
 121         /* Get colors */
 122         GP_LoadBasicColors(display, colors);
 123
 124         /* Set up a clipping rectangle to test proper clipping of pixels */
 125         SDL_Rect clip_rect = { 10, 10, 620, 460 };
 126         SDL_SetClipRect(display, &clip_rect);
 127
 128         /* Set up the timer */
 129         timer = SDL_AddTimer(1000, timer_callback, NULL);
 130         if (timer == 0) {
 131                 fprintf(stderr, "Could not set up timer: %s\n", SDL_GetError());
 132                 goto fail;
 133         }
 134
 135         /* Enter the event loop */
 136         event_loop();
 137
 138         /* Preserve the last result by a newline */
 139         fprintf(stdout, "\n");
 140
 141         /* We're done */
 142         SDL_Quit();
 143         return 0;
 144
 145 fail:
 146         SDL_Quit();
 147         return 1;
 148 }
 149