initial commit

oscar64/autotest/scrolltest.c

@@ -0,0 +1,107 @@
+#include <assert.h>
+
+#define Screen ((char *)0x0400)
+
+void scroll_left(void)
+{
+	char	*	dp = Screen;
+	for(char y=0; y<25; y++)
+	{
+		for(char x=0; x<39; x++)
+		{
+			dp[x] = dp[x + 1];
+		}
+		dp += 40;
+	}
+}
+
+void scroll_right(void)
+{
+	char	*	dp = Screen;
+	for(char y=0; y<25; y++)
+	{
+		for(char x=39; x>0; x--)
+		{
+			dp[x] = dp[x - 1];
+		}
+		dp += 40;
+	}
+}
+
+void scroll_up(void)
+{
+	char	*	dp = Screen, * sp = dp + 40;
+	for(char y=0; y<24; y++)
+	{
+		for(char x=0; x<40; x++)
+		{
+			dp[x] = sp[x];
+		}
+		dp = sp;
+		sp += 40;
+	}
+}
+
+void scroll_down(void)
+{
+	char	*	dp = Screen + 24 * 40, * sp = dp - 40;
+	for(char y=0; y<24; y++)
+	{
+		for(char x=0; x<40; x++)
+		{
+			dp[x] = sp[x];
+		}
+		dp = sp;
+		sp -= 40;
+	}
+}
+
+void fill_screen(void)
+{
+	for(char y=0; y<25; y++)
+	{
+		for(char x=0; x<40; x++)
+		{
+			Screen[40 * y + x] = 7 * y + x;
+		}
+	}
+}
+
+void check_screen(int dy, int dx)
+{
+	for(int y=0; y<25; y++)
+	{
+		for(int x=0; x<40; x++)
+		{
+			int sy = y + dy;
+			int sx = x + dx;
+
+			char	c = 7 * y + x;
+			if (sy >= 0 && sy < 25 && sx >= 0 && sx < 40)
+				c = 7 * sy + sx;
+
+			assert(Screen[40 * y + x] == c);
+		}
+	}
+}
+
+int main(void)
+{
+	fill_screen();
+	scroll_left();
+	check_screen(0, 1);
+
+	fill_screen();
+	scroll_right();
+	check_screen(0, -1);
+
+	fill_screen();
+	scroll_up();
+	check_screen(1, 0);
+
+	fill_screen();
+	scroll_down();
+	check_screen(-1, 0);
+
+	return 0;
+}