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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. /*
  39.  * Tetris screen control.
  40.  */
  41.  
  42. #include <err.h>
  43. #include <stdio.h>
  44. #include <stdlib.h>
  45. #include <string.h>
  46. #include <unistd.h>
  47. #include <io/stream.h>
  48.  
  49.  
  50. #include <async.h>
  51. #include "screen.h"
  52. #include "tetris.h"
  53. #include "../console/console.h"
  54.  
  55. static cell curscreen[B_SIZE];  /* 1 => standout (or otherwise marked) */
  56. static int curscore;
  57. static int isset;       /* true => terminal is in game mode */
  58. static struct termios oldtt;
  59. static void (*tstp)(int);
  60.  
  61. static void scr_stop(int);
  62. static void stopset(int);
  63.  
  64. static char
  65.         *CEstr;         /* clear to end of line */
  66.  
  67.  
  68. /*
  69.  * putstr() is for unpadded strings (either as in termcap(5) or
  70.  * simply literal strings);
  71.  */
  72. #define putstr(s)   puts(s)
  73.  
  74. static int con_phone;
  75.  
  76.  
  77.  
  78. static void set_style(int fgcolor, int bgcolor)
  79. {
  80.     send_call_2(con_phone, CONSOLE_SET_STYLE, fgcolor, bgcolor);
  81. }
  82.  
  83. static void start_standout(void)
  84. {
  85.     set_style(0, 0xe0e0e0);
  86. }
  87.  
  88. static void resume_normal(void)
  89. {
  90.     set_style(0xe0e0e0, 0);
  91. }
  92.  
  93. /*
  94.  * Clear the screen, forgetting the current contents in the process.
  95.  */
  96. void
  97. scr_clear(void)
  98. {
  99.  
  100.     resume_normal();
  101.     send_call(con_phone, CONSOLE_CLEAR, 0);
  102.     curscore = -1;
  103.     memset((char *)curscreen, 0, sizeof(curscreen));
  104. }
  105.  
  106. /*
  107.  * Set up screen
  108.  */
  109. void
  110. scr_init(void)
  111. {
  112.     con_phone = get_fd_phone(1);
  113.     resume_normal();
  114.     scr_clear();
  115. }
  116.  
  117. static void moveto(int r, int c)
  118. {
  119.     send_call_2(con_phone, CONSOLE_GOTO, r, c);
  120. }
  121.  
  122. static void fflush(void)
  123. {
  124.     send_call(con_phone, CONSOLE_FLUSH, 0);
  125. }
  126.  
  127. struct winsize {
  128.     ipcarg_t ws_row;
  129.     ipcarg_t ws_col;
  130. };
  131.  
  132. static int get_display_size(struct winsize *ws)
  133. {
  134.     return sync_send_2(con_phone, CONSOLE_GETSIZE, 0, 0, &ws->ws_row, &ws->ws_col);
  135. }
  136.  
  137. static void
  138. scr_stop(int sig)
  139. {
  140.  
  141.     scr_end();
  142.     scr_set();
  143.     scr_msg(key_msg, 1);
  144. }
  145.  
  146. /*
  147.  * Set up screen mode.
  148.  */
  149. void
  150. scr_set(void)
  151. {
  152.     struct winsize ws;
  153.  
  154.     Rows = 0, Cols = 0;
  155.     if (get_display_size(&ws) == 0) {
  156.         Rows = ws.ws_row;
  157.         Cols = ws.ws_col;
  158.     }
  159.     if (Rows < MINROWS || Cols < MINCOLS) {
  160.         char smallscr[55];
  161.  
  162.         (void)snprintf(smallscr, sizeof(smallscr),
  163.             "the screen is too small (must be at least %dx%d)",
  164.             MINROWS, MINCOLS);
  165.         stop(smallscr);
  166.     }
  167.     isset = 1;
  168.  
  169.     scr_clear();
  170. }
  171.  
  172. /*
  173.  * End screen mode.
  174.  */
  175. void
  176. scr_end(void)
  177. {
  178. }
  179.  
  180. void
  181. stop(char *why)
  182. {
  183.  
  184.     if (isset)
  185.         scr_end();
  186.     errx(1, "aborting: %s", why);
  187. }
  188.  
  189.  
  190. /*
  191.  * Update the screen.
  192.  */
  193. void
  194. scr_update(void)
  195. {
  196.     cell *bp, *sp;
  197.     cell so, cur_so = 0;
  198.     int i, ccol, j;
  199.     static const struct shape *lastshape;
  200.  
  201.     /* always leave cursor after last displayed point */
  202.     curscreen[D_LAST * B_COLS - 1] = -1;
  203.  
  204.     if (score != curscore) {
  205.         moveto(0, 0);
  206.         (void) printf("Score: %d", score);
  207.         curscore = score;
  208.     }
  209.  
  210.     /* draw preview of next pattern */
  211.     if (showpreview && (nextshape != lastshape)) {
  212.         int i;
  213.         static int r=5, c=2;
  214.         int tr, tc, t;
  215.  
  216.         lastshape = nextshape;
  217.  
  218.         /* clean */
  219.         resume_normal();
  220.         moveto(r-1, c-1); putstr("          ");
  221.         moveto(r,   c-1); putstr("          ");
  222.         moveto(r+1, c-1); putstr("          ");
  223.         moveto(r+2, c-1); putstr("          ");
  224.  
  225.         moveto(r-3, c-2);
  226.         putstr("Next shape:");
  227.  
  228.         /* draw */
  229.         start_standout();
  230.         moveto(r, 2 * c);
  231.         putstr("  ");
  232.         for (i = 0; i < 3; i++) {
  233.             t = c + r * B_COLS;
  234.             t += nextshape->off[i];
  235.  
  236.             tr = t / B_COLS;
  237.             tc = t % B_COLS;
  238.  
  239.             moveto(tr, 2*tc);
  240.             putstr("  ");
  241.         }
  242.         resume_normal();
  243.     }
  244.  
  245.     bp = &board[D_FIRST * B_COLS];
  246.     sp = &curscreen[D_FIRST * B_COLS];
  247.     for (j = D_FIRST; j < D_LAST; j++) {
  248.         ccol = -1;
  249.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  250.             if (*sp == (so = *bp))
  251.                 continue;
  252.             *sp = so;
  253.             if (i != ccol) {
  254.                 moveto(RTOD(j), CTOD(i));
  255.             }
  256.             if (so != cur_so) {
  257.                 if (so)
  258.                     start_standout();
  259.                 else
  260.                     resume_normal();
  261.                 cur_so = so;
  262.             }
  263.             putstr("  ");
  264.             ccol = i + 1;
  265.             /*
  266.              * Look ahead a bit, to avoid extra motion if
  267.              * we will be redrawing the cell after the next.
  268.              * Motion probably takes four or more characters,
  269.              * so we save even if we rewrite two cells
  270.              * `unnecessarily'.  Skip it all, though, if
  271.              * the next cell is a different color.
  272.              */
  273. #define STOP (B_COLS - 3)
  274.             if (i > STOP || sp[1] != bp[1] || so != bp[1])
  275.                 continue;
  276.             if (sp[2] != bp[2])
  277.                 sp[1] = -1;
  278.             else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
  279.                 sp[2] = -1;
  280.                 sp[1] = -1;
  281.             }
  282.         }
  283.     }
  284.     resume_normal();
  285.  
  286.     fflush();
  287. }
  288.  
  289. /*
  290.  * Write a message (set!=0), or clear the same message (set==0).
  291.  * (We need its length in case we have to overwrite with blanks.)
  292.  */
  293. void
  294. scr_msg(char *s, int set)
  295. {
  296.    
  297.     int l = strlen(s);
  298.    
  299.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  300.     if (set)
  301.         putstr(s);
  302.     else
  303.         while (--l >= 0)
  304.             (void) putchar(' ');
  305. }
  306.