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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.     fflush(stdout);
  81.     console_set_rgb_color(fphone(stdout), 0xf0f0f0, color);
  82. }
  83.  
  84. static void resume_normal(void)
  85. {
  86.     fflush(stdout);
  87.     console_set_rgb_color(fphone(stdout), 0, 0xf0f0f0);
  88. }
  89.  
  90. void clear_screen(void)
  91. {
  92.     console_clear(fphone(stdout));
  93.     moveto(0, 0);
  94. }
  95.  
  96. /*
  97.  * Clear the screen, forgetting the current contents in the process.
  98.  */
  99. void scr_clear(void)
  100. {
  101.     resume_normal();
  102.     console_clear(fphone(stdout));
  103.     curscore = -1;
  104.     memset(curscreen, 0, sizeof(curscreen));
  105. }
  106.  
  107. /*
  108.  * Set up screen
  109.  */
  110. void scr_init(void)
  111. {
  112.     console_cursor_visibility(fphone(stdout), 0);
  113.     resume_normal();
  114.     scr_clear();
  115. }
  116.  
  117. void moveto(int r, int c)
  118. {
  119.     fflush(stdout);
  120.     console_goto(fphone(stdout), c, r);
  121. }
  122.  
  123. winsize_t winsize;
  124.  
  125. static int get_display_size(winsize_t *ws)
  126. {
  127.     return console_get_size(fphone(stdout), &ws->ws_col, &ws->ws_row);
  128. }
  129.  
  130. /*
  131.  * Set up screen mode.
  132.  */
  133. void scr_set(void)
  134. {
  135.     winsize_t ws;
  136.    
  137.     Rows = 0;
  138.     Cols = 0;
  139.    
  140.     if (get_display_size(&ws) == 0) {
  141.         Rows = ws.ws_row;
  142.         Cols = ws.ws_col;
  143.     }
  144.    
  145.     if ((Rows < MINROWS) || (Cols < MINCOLS)) {
  146.         char smallscr[55];
  147.        
  148.         snprintf(smallscr, sizeof(smallscr),
  149.             "the screen is too small (must be at least %dx%d)",
  150.             MINROWS, MINCOLS);
  151.         stop(smallscr);
  152.     }
  153.     isset = 1;
  154.    
  155.     scr_clear();
  156. }
  157.  
  158. /*
  159.  * End screen mode.
  160.  */
  161. void scr_end(void)
  162. {
  163.     console_cursor_visibility(fphone(stdout), 1);
  164. }
  165.  
  166. void stop(char *why)
  167. {
  168.     if (isset)
  169.         scr_end();
  170.    
  171.     errx(1, "aborting: %s", why);
  172. }
  173.  
  174. /*
  175.  * Update the screen.
  176.  */
  177. void scr_update(void)
  178. {
  179.     cell *bp;
  180.     cell *sp;
  181.     cell so;
  182.     cell cur_so = 0;
  183.     int i;
  184.     int j;
  185.     int ccol;
  186.    
  187.     /* Always leave cursor after last displayed point */
  188.     curscreen[D_LAST * B_COLS - 1] = -1;
  189.    
  190.     if (score != curscore) {
  191.         moveto(0, 0);
  192.         printf("Score: %d", score);
  193.         curscore = score;
  194.     }
  195.    
  196.     /* Draw preview of next pattern */
  197.     if ((showpreview) && (nextshape != lastshape)) {
  198.         int i;
  199.         static int r = 5, c = 2;
  200.         int tr, tc, t;
  201.        
  202.         lastshape = nextshape;
  203.        
  204.         /* Clean */
  205.         resume_normal();
  206.         moveto(r - 1, c - 1);
  207.         putstr("          ");
  208.         moveto(r, c - 1);
  209.         putstr("          ");
  210.         moveto(r + 1, c - 1);
  211.         putstr("          ");
  212.         moveto(r + 2, c - 1);
  213.         putstr("          ");
  214.        
  215.         moveto(r - 3, c - 2);
  216.         putstr("Next shape:");
  217.        
  218.         /* Draw */
  219.         start_standout(nextshape->color);
  220.         moveto(r, 2 * c);
  221.         putstr("  ");
  222.         for (i = 0; i < 3; i++) {
  223.             t = c + r * B_COLS;
  224.             t += nextshape->off[i];
  225.            
  226.             tr = t / B_COLS;
  227.             tc = t % B_COLS;
  228.            
  229.             moveto(tr, 2*tc);
  230.             putstr("  ");
  231.         }
  232.         resume_normal();
  233.     }
  234.    
  235.     bp = &board[D_FIRST * B_COLS];
  236.     sp = &curscreen[D_FIRST * B_COLS];
  237.     for (j = D_FIRST; j < D_LAST; j++) {
  238.         ccol = -1;
  239.         for (i = 0; i < B_COLS; bp++, sp++, i++) {
  240.             if (*sp == (so = *bp))
  241.                 continue;
  242.            
  243.             *sp = so;
  244.             if (i != ccol) {
  245.                 if (cur_so) {
  246.                     resume_normal();
  247.                     cur_so = 0;
  248.                 }
  249.                 moveto(RTOD(j), CTOD(i));
  250.             }
  251.            
  252.             if (so != cur_so) {
  253.                 if (so)
  254.                     start_standout(so);
  255.                 else
  256.                     resume_normal();
  257.                 cur_so = so;
  258.             }
  259.             putstr("  ");
  260.            
  261.             ccol = i + 1;
  262.             /*
  263.              * Look ahead a bit, to avoid extra motion if
  264.              * we will be redrawing the cell after the next.
  265.              * Motion probably takes four or more characters,
  266.              * so we save even if we rewrite two cells
  267.              * `unnecessarily'.  Skip it all, though, if
  268.              * the next cell is a different color.
  269.              */
  270.            
  271.             if ((i > STOP) || (sp[1] != bp[1]) || (so != bp[1]))
  272.                 continue;
  273.            
  274.             if (sp[2] != bp[2])
  275.                 sp[1] = -1;
  276.             else if ((i < STOP) && (so == bp[2]) && (sp[3] != bp[3])) {
  277.                 sp[2] = -1;
  278.                 sp[1] = -1;
  279.             }
  280.         }
  281.     }
  282.    
  283.     if (cur_so)
  284.         resume_normal();
  285.    
  286.     fflush(stdout);
  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 scr_msg(char *s, int set)
  294. {
  295.     int l = str_size(s);
  296.    
  297.     moveto(Rows - 2, ((Cols - l) >> 1) - 1);
  298.    
  299.     if (set)
  300.         putstr(s);
  301.     else
  302.         while (--l >= 0)
  303.             (void) putchar(' ');
  304. }
  305.  
  306. /** @}
  307.  */
  308.