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  1. /*  $OpenBSD: screen.c,v 1.13 2006/04/20 03:25:36 ray Exp $ */
  2. /*  $NetBSD: screen.c,v 1.4 1995/04/29 01:11:36 mycroft Exp $   */
  3.  
  4. /*-
  5.  * Copyright (c) 1992, 1993
  6.  *  The Regents of the University of California.  All rights reserved.
  7.  *
  8.  * This code is derived from software contributed to Berkeley by
  9.  * Chris Torek and Darren F. Provine.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions and the following disclaimer.
  16.  * 2. Redistributions in binary form must reproduce the above copyright
  17.  *    notice, this list of conditions and the following disclaimer in the
  18.  *    documentation and/or other materials provided with the distribution.
  19.  * 3. Neither the name of the University nor the names of its contributors
  20.  *    may be used to endorse or promote products derived from this software
  21.  *    without specific prior written permission.
  22.  *
  23.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33.  * SUCH DAMAGE.
  34.  *
  35.  *  @(#)screen.c    8.1 (Berkeley) 5/31/93
  36.  */
  37.  
  38. /** @addtogroup tetris
  39.  * @{
  40.  */
  41. /** @file
  42.  */
  43.  
  44. /*
  45.  * Tetris screen control.
  46.  */
  47.  
  48. #include <err.h>
  49. #include <stdio.h>
  50. #include <stdlib.h>
  51. #include <string.h>
  52. #include <unistd.h>
  53. #include <console.h>
  54.  
  55. #include <async.h>
  56. #include "screen.h"
  57. #include "tetris.h"
  58. #include <ipc/console.h>
  59.  
  60. static cell curscreen[B_SIZE];  /* 1 => standout (or otherwise marked) */
  61. static int curscore;
  62. static int isset;       /* true => terminal is in game mode */
  63.  
  64.  
  65. /*
  66.  * putstr() is for unpadded strings (either as in termcap(5) or
  67.  * simply literal strings);
  68.  */
  69. static inline void putstr(char *s)
  70. {
  71.     while (*s)
  72.         putchar(*(s++));
  73. }
  74.  
  75. static void start_standout(void)
  76. {
  77.     console_set_rgb_color(0xf0f0f0, 0);
  78. }
  79.  
  80. static void resume_normal(void)
  81. {
  82.     console_set_rgb_color(0, 0xf0f0f0);
  83. }
  84.  
  85. void clear_screen(void)
  86. {
  87.     console_clear();
  88.     moveto(0, 0);
  89. }
  90.  
  91. /*
  92.  * Clear the screen, forgetting the current contents in the process.
  93.  */
  94. void
  95. scr_clear(void)
  96. {
  97.  
  98.     resume_normal();
  99.     console_clear();
  100.     curscore = -1;
  101.     memset((char *)curscreen, 0, sizeof(curscreen));
  102. }
  103.  
  104. /*
  105.  * Set up screen
  106.  */
  107. void
  108. scr_init(void)
  109. {
  110.     console_cursor_visibility(0);
  111.     resume_normal();
  112.     scr_clear();
  113. }
  114.  
  115. void moveto(int r, int c)
  116. {
  117.     console_goto(r, c);
  118. }
  119.  
  120. winsize_t winsize;
  121.  
  122. static int get_display_size(winsize_t *ws)
  123. {
  124.     return console_get_size(&ws->ws_row, &ws->ws_col);
  125. }
  126.  
  127. /*
  128.  * Set up screen mode.
  129.  */
  130. void
  131. scr_set(void)
  132. {
  133.     winsize_t ws;
  134.  
  135.     Rows = 0, Cols = 0;
  136.     if (get_display_size(&ws) == 0) {
  137.         Rows = ws.ws_row;
  138.         Cols = ws.ws_col;
  139.     }
  140.     if (Rows < MINROWS || Cols < MINCOLS) {
  141.         char smallscr[55];
  142.  
  143.         snprintf(smallscr, sizeof(smallscr),
  144.             "the screen is too small (must be at least %dx%d)",
  145.             MINROWS, MINCOLS);
  146.         stop(smallscr);
  147.     }
  148.     isset = 1;
  149.  
  150.     scr_clear();
  151. }
  152.  
  153. /*
  154.  * End screen mode.
  155.  */
  156. void
  157. scr_end(void)
  158. {
  159. }
  160.  
  161. void
  162. stop(char *why)
  163. {
  164.  
  165.     if (isset)
  166.         scr_end();
  167.     errx(1, "aborting: %s", why);
  168. }
  169.  
  170.  
  171. /*
  172.  * Update the screen.
  173.  */
  174. void
  175. scr_update(void)
  176. {
  177.     cell *bp, *sp;
  178.     cell so, cur_so = 0;
  179.     int i, ccol, j;
  180.     static const struct shape *lastshape;
  181.  
  182.     /* always leave cursor after last displayed point */
  183.     curscreen[D_LAST * B_COLS - 1] = -1;
  184.  
  185.     if (score != curscore) {
  186.         moveto(0, 0);
  187.         printf("Score: %d", score);
  188.         curscore = score;
  189.     }
  190.  
  191.     /* draw preview of next pattern */
  192.     if (showpreview && (nextshape != lastshape)) {
  193.         int i;
  194.         static int r=5, c=2;
  195.         int tr, tc, t;
  196.  
  197.         lastshape = nextshape;
  198.  
  199.         /* clean */
  200.         resume_normal();
  201.         moveto(r-1, c-1); putstr("          ");
  202.         moveto(r,   c-1); putstr("          ");
  203.         moveto(r+1, c-1); putstr("          ");
  204.         moveto(r+2, c-1); putstr("          ");
  205.  
  206.         moveto(r-3, c-2);
  207.         putstr("Next shape:");
  208.  
  209.         /* draw */
  210.         start_standout();
  211.         moveto(r, 2 * c);
  212.         putstr("  ");
  213.         for (i = 0; i < 3; i++) {
  214.             t = c + r * B_COLS;
  215.             t += nextshape->off[i];
  216.  
  217.             tr = t / B_COLS;
  218.             tc = t % B_COLS;
  219.  
  220.             moveto(tr, 2*tc);
  221.             putstr("  ");
  222.         }
  223.         resume_normal();
  224.     }
  225.  
  226.     bp = &board[D_FIRST * B_COLS];
  227.     sp = &curscreen[D_FIRST * B_COLS];
  228.     for (j = D_FIRST; j < D_LAST; j++) {
  229.         ccol = -1;
  230.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  231.             if (*sp == (so = *bp))
  232.                 continue;
  233.             *sp = so;
  234.             if (i != ccol) {
  235.                 if (cur_so) {
  236.                     resume_normal();
  237.                     cur_so = 0;
  238.                 }
  239.                 moveto(RTOD(j), CTOD(i));
  240.             }
  241.             if (so != cur_so) {
  242.                 if (so)
  243.                     start_standout();
  244.                 else
  245.                     resume_normal();
  246.                 cur_so = so;
  247.             }
  248.             putstr("  ");
  249.  
  250.             ccol = i + 1;
  251.             /*
  252.              * Look ahead a bit, to avoid extra motion if
  253.              * we will be redrawing the cell after the next.
  254.              * Motion probably takes four or more characters,
  255.              * so we save even if we rewrite two cells
  256.              * `unnecessarily'.  Skip it all, though, if
  257.              * the next cell is a different color.
  258.              */
  259. #define STOP (B_COLS - 3)
  260.             if (i > STOP || sp[1] != bp[1] || so != bp[1])
  261.                 continue;
  262.             if (sp[2] != bp[2])
  263.                 sp[1] = -1;
  264.             else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
  265.                 sp[2] = -1;
  266.                 sp[1] = -1;
  267.             }
  268.         }
  269.     }
  270.     if (cur_so)
  271.         resume_normal();
  272.     fflush(stdout);
  273. }
  274.  
  275. /*
  276.  * Write a message (set!=0), or clear the same message (set==0).
  277.  * (We need its length in case we have to overwrite with blanks.)
  278.  */
  279. void
  280. scr_msg(char *s, int set)
  281. {
  282.    
  283.     int l = strlen(s);
  284.    
  285.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  286.     if (set)
  287.         putstr(s);
  288.     else
  289.         while (--l >= 0)
  290.             (void) putchar(' ');
  291. }
  292.  
  293. /** @}
  294.  */
  295.  
  296.