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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 <vfs/vfs.h>
  54. #include <async.h>
  55. #include "screen.h"
  56. #include "tetris.h"
  57. #include <io/console.h>
  58.  
  59. #define STOP  (B_COLS - 3)
  60.  
  61. static cell curscreen[B_SIZE];  /* non-zero => standout (or otherwise marked) */
  62. static int curscore;
  63. static int isset;               /* true => terminal is in game mode */
  64.  
  65. static const struct shape *lastshape;
  66.  
  67.  
  68. /*
  69.  * putstr() is for unpadded strings (either as in termcap(5) or
  70.  * simply literal strings);
  71.  */
  72. static inline void putstr(char *s)
  73. {
  74.     while (*s)
  75.         putchar(*(s++));
  76. }
  77.  
  78. static void start_standout(uint32_t color)
  79. {
  80.     console_set_rgb_color(fphone(stdout), 0xf0f0f0, color);
  81. }
  82.  
  83. static void resume_normal(void)
  84. {
  85.     console_set_rgb_color(fphone(stdout), 0, 0xf0f0f0);
  86. }
  87.  
  88. void clear_screen(void)
  89. {
  90.     console_clear(fphone(stdout));
  91.     moveto(0, 0);
  92. }
  93.  
  94. /*
  95.  * Clear the screen, forgetting the current contents in the process.
  96.  */
  97. void scr_clear(void)
  98. {
  99.     resume_normal();
  100.     console_clear(fphone(stdout));
  101.     curscore = -1;
  102.     memset(curscreen, 0, sizeof(curscreen));
  103. }
  104.  
  105. /*
  106.  * Set up screen
  107.  */
  108. void scr_init(void)
  109. {
  110.     console_cursor_visibility(fphone(stdout), 0);
  111.     resume_normal();
  112.     scr_clear();
  113. }
  114.  
  115. void moveto(int r, int c)
  116. {
  117.     console_goto(fphone(stdout), c, r);
  118. }
  119.  
  120. winsize_t winsize;
  121.  
  122. static int get_display_size(winsize_t *ws)
  123. {
  124.     return console_get_size(fphone(stdout), &ws->ws_col, &ws->ws_row);
  125. }
  126.  
  127. /*
  128.  * Set up screen mode.
  129.  */
  130. void scr_set(void)
  131. {
  132.     winsize_t ws;
  133.    
  134.     Rows = 0;
  135.     Cols = 0;
  136.    
  137.     if (get_display_size(&ws) == 0) {
  138.         Rows = ws.ws_row;
  139.         Cols = ws.ws_col;
  140.     }
  141.    
  142.     if ((Rows < MINROWS) || (Cols < MINCOLS)) {
  143.         char smallscr[55];
  144.        
  145.         snprintf(smallscr, sizeof(smallscr),
  146.             "the screen is too small (must be at least %dx%d)",
  147.             MINROWS, MINCOLS);
  148.         stop(smallscr);
  149.     }
  150.     isset = 1;
  151.    
  152.     scr_clear();
  153. }
  154.  
  155. /*
  156.  * End screen mode.
  157.  */
  158. void scr_end(void)
  159. {
  160.     console_cursor_visibility(fphone(stdout), 1);
  161. }
  162.  
  163. void stop(char *why)
  164. {
  165.     if (isset)
  166.         scr_end();
  167.    
  168.     errx(1, "aborting: %s", why);
  169. }
  170.  
  171. /*
  172.  * Update the screen.
  173.  */
  174. void scr_update(void)
  175. {
  176.     cell *bp;
  177.     cell *sp;
  178.     cell so;
  179.     cell cur_so = 0;
  180.     int i;
  181.     int j;
  182.     int ccol;
  183.    
  184.     /* Always leave cursor after last displayed point */
  185.     curscreen[D_LAST * B_COLS - 1] = -1;
  186.    
  187.     if (score != curscore) {
  188.         moveto(0, 0);
  189.         printf("Score: %d", score);
  190.         curscore = score;
  191.     }
  192.    
  193.     /* Draw preview of next pattern */
  194.     if ((showpreview) && (nextshape != lastshape)) {
  195.         int i;
  196.         static int r = 5, c = 2;
  197.         int tr, tc, t;
  198.        
  199.         lastshape = nextshape;
  200.        
  201.         /* Clean */
  202.         resume_normal();
  203.         moveto(r - 1, c - 1);
  204.         putstr("          ");
  205.         moveto(r, c - 1);
  206.         putstr("          ");
  207.         moveto(r + 1, c - 1);
  208.         putstr("          ");
  209.         moveto(r + 2, c - 1);
  210.         putstr("          ");
  211.        
  212.         moveto(r - 3, c - 2);
  213.         putstr("Next shape:");
  214.        
  215.         /* Draw */
  216.         start_standout(nextshape->color);
  217.         moveto(r, 2 * c);
  218.         putstr("  ");
  219.         for (i = 0; i < 3; i++) {
  220.             t = c + r * B_COLS;
  221.             t += nextshape->off[i];
  222.            
  223.             tr = t / B_COLS;
  224.             tc = t % B_COLS;
  225.            
  226.             moveto(tr, 2*tc);
  227.             putstr("  ");
  228.         }
  229.         resume_normal();
  230.     }
  231.    
  232.     bp = &board[D_FIRST * B_COLS];
  233.     sp = &curscreen[D_FIRST * B_COLS];
  234.     for (j = D_FIRST; j < D_LAST; j++) {
  235.         ccol = -1;
  236.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  237.             if (*sp == (so = *bp))
  238.                 continue;
  239.            
  240.             *sp = so;
  241.             if (i != ccol) {
  242.                 if (cur_so) {
  243.                     resume_normal();
  244.                     cur_so = 0;
  245.                 }
  246.                 moveto(RTOD(j), CTOD(i));
  247.             }
  248.            
  249.             if (so != cur_so) {
  250.                 if (so)
  251.                     start_standout(so);
  252.                 else
  253.                     resume_normal();
  254.                 cur_so = so;
  255.             }
  256.             putstr("  ");
  257.            
  258.             ccol = i + 1;
  259.             /*
  260.              * Look ahead a bit, to avoid extra motion if
  261.              * we will be redrawing the cell after the next.
  262.              * Motion probably takes four or more characters,
  263.              * so we save even if we rewrite two cells
  264.              * `unnecessarily'.  Skip it all, though, if
  265.              * the next cell is a different color.
  266.              */
  267.            
  268.             if ((i > STOP) || (sp[1] != bp[1]) || (so != bp[1]))
  269.                 continue;
  270.            
  271.             if (sp[2] != bp[2])
  272.                 sp[1] = -1;
  273.             else if ((i < STOP) && (so == bp[2]) && (sp[3] != bp[3])) {
  274.                 sp[2] = -1;
  275.                 sp[1] = -1;
  276.             }
  277.         }
  278.     }
  279.    
  280.     if (cur_so)
  281.         resume_normal();
  282.    
  283.     fflush(stdout);
  284. }
  285.  
  286. /*
  287.  * Write a message (set != 0), or clear the same message (set == 0).
  288.  * (We need its length in case we have to overwrite with blanks.)
  289.  */
  290. void scr_msg(char *s, int set)
  291. {
  292.     int l = str_size(s);
  293.    
  294.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  295.    
  296.     if (set)
  297.         putstr(s);
  298.     else
  299.         while (--l >= 0)
  300.             (void) putchar(' ');
  301. }
  302.  
  303. /** @}
  304.  */
  305.