* README:

+ Added a note about dos cross-compilation.
  * configure.ac:
    + Added a check for ScreenUpdate in <pc.h>.
  * libee/graphics.c libee/ee.c:
    + Improved the conio port thanks to ScreenUpdate().

README

@@ -6,6 +6,10 @@ Building ttyvaders
 
     --enable-slang: use the SLang library (default)
     --enable-ncurses: use the ncurses library
+    --enable-conio: use MS-DOS conio.h
+
+   Cross-compilation example:
+    ./configure --enable-conio --host=i386-pc-msdosdjgpp
 
 
 History of textmode games

configure.ac

@@ -14,6 +14,10 @@ AM_PROG_CC_C_O
 AC_PROG_CPP
 AC_PROG_RANLIB
 
+dnl AC_PROG_EGREP only exists in autoconf 2.54+, so we use AC_EGREP_CPP right
+dnl now otherwise it might be set in an obscure if statement.
+AC_EGREP_CPP(foo,foo)
+
 AC_ARG_ENABLE(slang,
   [  --enable-slang          slang graphics support (default enabled)])
 AC_ARG_ENABLE(ncurses,
@@ -26,6 +30,12 @@ USE_NCURSES=false
 USE_CONIO=false
 if test "${enable_conio}" = "yes"; then
   AC_CHECK_HEADER(conio.h,:,AC_MSG_ERROR([cannot find conio.h header]))
+  AC_MSG_CHECKING(for ScreenUpdate in pc.h)
+  AC_EGREP_HEADER(ScreenUpdate,pc.h,[
+    AC_MSG_RESULT(yes)
+    AC_DEFINE(SCREENUPDATE_IN_PC_H, 1,
+              Define if <pc.h> defines ScreenUpdate.)],[
+    AC_MSG_RESULT(no)])
   AC_DEFINE(USE_CONIO, 1, Define if the backend driver is conio.h)
   USE_CONIO=:
 elif test "${enable_ncurses}" = "yes"; then

libee/ee.c

@@ -22,12 +22,16 @@
 
 #include "config.h"
 
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
 #   include <slang.h>
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
 #   include <curses.h>
-#elif USE_CONIO
+#elif defined(USE_CONIO)
+#   include <dos.h>
 #   include <conio.h>
+#   if defined(SCREENUPDATE_IN_PC_H)
+#       include <pc.h>
+#   endif
 #else
 #   error "no graphics library detected"
 #endif
@@ -41,13 +45,14 @@
 #include "ee.h"
 
 static int _ee_delay;
-#ifdef USE_CONIO
+#if defined(USE_CONIO)
 static struct text_info ti;
+char *_screen_buffer;
 #endif
 
 int ee_init(void)
 {
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
     static char * colors[] = { "black", "green", "yellow", "white",
         "red", "gray", "lightgray", "blue", "cyan", "magenta", NULL };
     int i;
@@ -81,7 +86,7 @@ int ee_init(void)
         SLtt_set_color(i + 1, NULL, colors[i], "black");
     }
 
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     /* Initialize ncurses library */
     initscr();
     keypad(stdscr, TRUE);
@@ -104,12 +109,13 @@ int ee_init(void)
     init_pair(EE_CYAN, COLOR_CYAN, COLOR_BLACK);
     init_pair(EE_MAGENTA, COLOR_MAGENTA, COLOR_BLACK);
 
-#elif USE_CONIO
+#elif defined(USE_CONIO)
     _wscroll = 0;
     _setcursortype(_NOCURSOR);
     clrscr();
     gettextinfo(&ti);
-//window(2, 2, 20, 20);
+    _screen_buffer = malloc(ee_get_width() * ee_get_height() * 2);
+    ScreenRetrieve(_screen_buffer);
 
 #endif
     _ee_delay = 0;
@@ -117,34 +123,34 @@ int ee_init(void)
     return 0;
 }
 
-void ee_set_delay(int delay)
+void ee_set_delay(int usec)
 {
-    _ee_delay = delay;
+    _ee_delay = usec;
 }
 
 int ee_get_width(void)
 {
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
     return SLtt_Screen_Cols;
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     return COLS;
-#elif USE_CONIO
+#elif defined(USE_CONIO)
     return ti.screenwidth;
 #endif
 }
 
 int ee_get_height(void)
 {
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
     return SLtt_Screen_Rows;
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     return LINES;
 #else
     return ti.screenheight;
 #endif
 }
 
-#ifndef USE_CONIO
+#if !defined(USE_CONIO)
 static int64_t local_time(void)
 {
     struct timeval tv;
@@ -160,7 +166,7 @@ static int64_t local_time(void)
 
 void ee_refresh(void)
 {
-#ifndef USE_CONIO
+#if !defined(USE_CONIO)
     static int64_t local_clock = 0;
     int64_t now;
 
@@ -176,15 +182,15 @@ void ee_refresh(void)
     }
 #endif
 
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
     SLsmg_refresh();
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     refresh();
-#elif USE_CONIO
-    /* Do nothing? */
+#elif defined(USE_CONIO)
+    ScreenUpdate(_screen_buffer);
 #endif
 
-#ifndef USE_CONIO
+#if !defined(USE_CONIO)
     now = local_time();
 
     if(now < local_clock + _ee_delay - 10000)
@@ -193,22 +199,27 @@ void ee_refresh(void)
     }
 
     local_clock += _ee_delay;
+#else
+    delay(5);
 #endif
 }
 
 void ee_end(void)
 {
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
     SLtt_set_cursor_visibility(1);
     SLang_reset_tty();
     SLsmg_reset_smg();
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     curs_set(1);
     endwin();
-#elif USE_CONIO
+#elif defined(USE_CONIO)
+    ScreenUpdate(_screen_buffer);
     _wscroll = 1;
-    ee_set_color(EE_WHITE);
-    ee_putstr(ee_get_width(), ee_get_height()-1, "\r\n");
+    textcolor((enum COLORS)WHITE);
+    textbackground((enum COLORS)BLACK);
+    gotoxy(ee_get_width(), ee_get_height());
+    cputs("\r\n");
     _setcursortype(_NORMALCURSOR);
 #endif
 }

libee/graphics.c

@@ -22,11 +22,11 @@
 
 #include "config.h"
 
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
 #   include <slang.h>
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
 #   include <curses.h>
-#elif USE_CONIO
+#elif defined(USE_CONIO)
 #   include <conio.h>
 #else
 #   error "no graphics library detected"
@@ -38,7 +38,7 @@
 #include "ee.h"
 
 static int ee_color = 0;
-#ifdef USE_CONIO
+#if defined(USE_CONIO)
 static enum COLORS dos_colors[] = {
     0,
     BLACK,
@@ -57,11 +57,11 @@ static enum COLORS dos_colors[] = {
 void ee_set_color(int color)
 {
     ee_color = color;
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
     SLsmg_set_color(color);
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     attrset(COLOR_PAIR(color));
-#elif USE_CONIO
+#elif defined(USE_CONIO)
     if(color >= 1 && color <= 10)
         textcolor(dos_colors[color]);
 #endif
@@ -72,31 +72,45 @@ int ee_get_color(void)
     return ee_color;
 }
 
+extern char *_screen_buffer;
+
 void ee_putchar(int x, int y, char c)
 {
-#ifdef USE_SLANG
+#if defined(USE_SLANG)
     SLsmg_gotorc(y,x);
     SLsmg_write_char(c);
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     move(y,x);
     addch(c);
-#elif USE_CONIO
-    gotoxy(x+1,y+1);
-    putch(c);
+#elif defined(USE_CONIO)
+    if(x<0 || x>=ee_get_width() || y<0 || y>=ee_get_height())
+        return;
+    _screen_buffer[2 * (x + y * ee_get_width())] = c;
+    _screen_buffer[2 * (x + y * ee_get_width()) + 1] = dos_colors[ee_color];
+//    gotoxy(x+1,y+1);
+//    putch(c);
 #endif
 }
 
 void ee_putstr(int x, int y, char *s)
 {
-#ifdef USE_SLANG
+    if(y<0 || y>=ee_get_height())
+        return;
+#if defined(USE_SLANG)
     SLsmg_gotorc(y,x);
     SLsmg_write_string(s);
-#elif USE_NCURSES
+#elif defined(USE_NCURSES)
     move(y,x);
     addstr(s);
-#elif USE_CONIO
-    gotoxy(x+1,y+1);
-    cputs(s);
+#elif defined(USE_CONIO)
+    char *buf = _screen_buffer + 2 * (x + y * ee_get_width());
+    while(*s)
+    {
+        *buf++ = *s++;
+        *buf++ = dos_colors[ee_color];
+    }
+//    gotoxy(x+1,y+1);
+//    cputs(s);
 #endif
 }