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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 <io/stream.h>
  54.  
  55.  
  56. #include <async.h>
  57. #include "screen.h"
  58. #include "tetris.h"
  59. #include "../console/console.h"
  60.  
  61. static cell curscreen[B_SIZE];  /* 1 => standout (or otherwise marked) */
  62. static int curscore;
  63. static int isset;       /* true => terminal is in game mode */
  64.  
  65.  
  66. /*
  67.  * putstr() is for unpadded strings (either as in termcap(5) or
  68.  * simply literal strings);
  69.  */
  70. static inline void putstr(char *s)
  71. {
  72.     while (*s)
  73.         putchar(*(s++));
  74. }
  75.  
  76. static int con_phone;
  77.  
  78.  
  79.  
  80. static void set_style(int fgcolor, int bgcolor)
  81. {
  82.     async_msg_2(con_phone, CONSOLE_SET_STYLE, fgcolor, bgcolor);
  83. }
  84.  
  85. static void start_standout(void)
  86. {
  87.     set_style(0xf0f0f0, 0);
  88. }
  89.  
  90. static void resume_normal(void)
  91. {
  92.     set_style(0, 0xf0f0f0);
  93. }
  94.  
  95.  
  96. void clear_screen(void)
  97. {
  98.     async_msg(con_phone, CONSOLE_CLEAR, 0);
  99.     moveto(0,0);
  100. }
  101.  
  102. /*
  103.  * Clear the screen, forgetting the current contents in the process.
  104.  */
  105. void
  106. scr_clear(void)
  107. {
  108.  
  109.     resume_normal();
  110.     async_msg(con_phone, CONSOLE_CLEAR, 0);
  111.     curscore = -1;
  112.     memset((char *)curscreen, 0, sizeof(curscreen));
  113. }
  114.  
  115. /*
  116.  * Set up screen
  117.  */
  118. void
  119. scr_init(void)
  120. {
  121.     con_phone = get_fd_phone(1);
  122.     async_msg(con_phone, CONSOLE_CURSOR_VISIBILITY, 0);
  123.     resume_normal();
  124.     scr_clear();
  125. }
  126.  
  127. void moveto(int r, int c)
  128. {
  129.     async_msg_2(con_phone, CONSOLE_GOTO, r, c);
  130. }
  131.  
  132. static void fflush(void)
  133. {
  134.     async_msg(con_phone, CONSOLE_FLUSH, 0);
  135. }
  136.  
  137. winsize_t winsize;
  138.  
  139. static int get_display_size(winsize_t *ws)
  140. {
  141.     return async_req_2(con_phone, CONSOLE_GETSIZE, 0, 0, &ws->ws_row, &ws->ws_col);
  142. }
  143.  
  144. /*
  145.  * Set up screen mode.
  146.  */
  147. void
  148. scr_set(void)
  149. {
  150.     winsize_t ws;
  151.  
  152.     Rows = 0, Cols = 0;
  153.     if (get_display_size(&ws) == 0) {
  154.         Rows = ws.ws_row;
  155.         Cols = ws.ws_col;
  156.     }
  157.     if (Rows < MINROWS || Cols < MINCOLS) {
  158.         char smallscr[55];
  159.  
  160.         snprintf(smallscr, sizeof(smallscr),
  161.             "the screen is too small (must be at least %dx%d)",
  162.             MINROWS, MINCOLS);
  163.         stop(smallscr);
  164.     }
  165.     isset = 1;
  166.  
  167.     scr_clear();
  168. }
  169.  
  170. /*
  171.  * End screen mode.
  172.  */
  173. void
  174. scr_end(void)
  175. {
  176. }
  177.  
  178. void
  179. stop(char *why)
  180. {
  181.  
  182.     if (isset)
  183.         scr_end();
  184.     errx(1, "aborting: %s", why);
  185. }
  186.  
  187.  
  188. /*
  189.  * Update the screen.
  190.  */
  191. void
  192. scr_update(void)
  193. {
  194.     cell *bp, *sp;
  195.     cell so, cur_so = 0;
  196.     int i, ccol, j;
  197.     static const struct shape *lastshape;
  198.  
  199.     /* always leave cursor after last displayed point */
  200.     curscreen[D_LAST * B_COLS - 1] = -1;
  201.  
  202.     if (score != curscore) {
  203.         moveto(0, 0);
  204.         printf("Score: %d", score);
  205.         curscore = score;
  206.     }
  207.  
  208.     /* draw preview of next pattern */
  209.     if (showpreview && (nextshape != lastshape)) {
  210.         int i;
  211.         static int r=5, c=2;
  212.         int tr, tc, t;
  213.  
  214.         lastshape = nextshape;
  215.  
  216.         /* clean */
  217.         resume_normal();
  218.         moveto(r-1, c-1); putstr("          ");
  219.         moveto(r,   c-1); putstr("          ");
  220.         moveto(r+1, c-1); putstr("          ");
  221.         moveto(r+2, c-1); putstr("          ");
  222.  
  223.         moveto(r-3, c-2);
  224.         putstr("Next shape:");
  225.  
  226.         /* draw */
  227.         start_standout();
  228.         moveto(r, 2 * c);
  229.         putstr("  ");
  230.         for (i = 0; i < 3; i++) {
  231.             t = c + r * B_COLS;
  232.             t += nextshape->off[i];
  233.  
  234.             tr = t / B_COLS;
  235.             tc = t % B_COLS;
  236.  
  237.             moveto(tr, 2*tc);
  238.             putstr("  ");
  239.         }
  240.         resume_normal();
  241.     }
  242.  
  243.     bp = &board[D_FIRST * B_COLS];
  244.     sp = &curscreen[D_FIRST * B_COLS];
  245.     for (j = D_FIRST; j < D_LAST; j++) {
  246.         ccol = -1;
  247.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  248.             if (*sp == (so = *bp))
  249.                 continue;
  250.             *sp = so;
  251.             if (i != ccol) {
  252.                 if (cur_so) {
  253.                     resume_normal();
  254.                     cur_so = 0;
  255.                 }
  256.                 moveto(RTOD(j), CTOD(i));
  257.             }
  258.             if (so != cur_so) {
  259.                 if (so)
  260.                     start_standout();
  261.                 else
  262.                     resume_normal();
  263.                 cur_so = so;
  264.             }
  265.             putstr("  ");
  266.  
  267.             ccol = i + 1;
  268.             /*
  269.              * Look ahead a bit, to avoid extra motion if
  270.              * we will be redrawing the cell after the next.
  271.              * Motion probably takes four or more characters,
  272.              * so we save even if we rewrite two cells
  273.              * `unnecessarily'.  Skip it all, though, if
  274.              * the next cell is a different color.
  275.              */
  276. #define STOP (B_COLS - 3)
  277.             if (i > STOP || sp[1] != bp[1] || so != bp[1])
  278.                 continue;
  279.             if (sp[2] != bp[2])
  280.                 sp[1] = -1;
  281.             else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
  282.                 sp[2] = -1;
  283.                 sp[1] = -1;
  284.             }
  285.         }
  286.     }
  287.     if (cur_so)
  288.         resume_normal();
  289.     fflush();
  290. }
  291.  
  292. /*
  293.  * Write a message (set!=0), or clear the same message (set==0).
  294.  * (We need its length in case we have to overwrite with blanks.)
  295.  */
  296. void
  297. scr_msg(char *s, int set)
  298. {
  299.    
  300.     int l = strlen(s);
  301.    
  302.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  303.     if (set)
  304.         putstr(s);
  305.     else
  306.         while (--l >= 0)
  307.             (void) putchar(' ');
  308. }
  309.  
  310. /** @}
  311.  */
  312.  
  313.