From 26ff8d1fb2ea8b2eea3828616f0175dac02c3307 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Sun, 15 Mar 2020 22:42:55 +0000
Subject: Added simple timing to get 50 frames a second, hopefully.

---
 src/Makefile |  6 +++++-
 src/czx81.c  | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 55 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/Makefile b/src/Makefile
index a9a835d..8ed3914 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -15,7 +15,11 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 TARGET=czx81
-CURSES=-lcursesw
+
+# This library may need to be set to one of these:
+#	cursesw
+#	ncursesw
+CURSES=-lncurses
 
 OBJS=	czx81.o		\
 	zx81rom.o
diff --git a/src/czx81.c b/src/czx81.c
index 57d3525..ccdceba 100644
--- a/src/czx81.c
+++ b/src/czx81.c
@@ -18,17 +18,63 @@
 #include "wide_curses.h"
 
 #include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
 #include <locale.h>
 
+static long TimeDiff(const struct timespec *start,
+		     const struct timespec *end)
+{
+    long diff;
+
+    diff = (end->tv_nsec - start->tv_nsec) +
+    		(end->tv_sec - start->tv_sec) * 1000000000L;
+
+    return diff;
+}
+
 int main(void)
 {
+    struct timespec start;
+    int quit = FALSE;
+
     setlocale(LC_ALL, "");
+
     initscr();
-    printw("Euro\n");
-    printw("\u20ac\n");
-    addwstr(L"\u20AC\n");
+    raw();
+    noecho();
+    keypad(stdscr, TRUE);
+    nodelay(stdscr, TRUE);
+
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    while(!quit)
+    {
+	struct timespec end;
+	struct timespec pause = {0};
+	int ch;
+
+	clear();
+
+	ch = getch();
+
+	if (ch == 3)
+	{
+	    quit = TRUE;
+	}
+
+	refresh();
+
+	clock_gettime(CLOCK_MONOTONIC, &end);
+	start = end;
+	pause.tv_nsec = 20000000 - TimeDiff(&start, &end);
+
+	if (pause.tv_nsec > 0)
+	{
+	    nanosleep(&pause, NULL);
+	}
+    }
 
-    getch();
     endwin();
 
     return EXIT_SUCCESS;
-- 
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