1 files changed, 89 insertions, 0 deletions
diff --git a/Plugins/gol.c b/Plugins/gol.c
new file mode 100644
index 0000000..89ff284
--- /dev/null
+++ b/Plugins/gol.c
@@ -0,0 +1,89 @@
+
+//
+// Game of Life .. what a waste of time
+//
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "plugin.h"
+
+#define BORN	1
+#define DYING	2
+
+int dead = 0;
+
+int aroundme(_frame f, int x, int y)
+{
+	int i=0;
+	if(r16(scanline16(f, y-1)[x-1])>dead) i++;
+	if(r16(scanline16(f, y-1)[x])>dead) i++;
+	if(r16(scanline16(f, y-1)[x+1])>dead) i++;
+	if(r16(scanline16(f, y)[x-1])>dead) i++;
+	if(r16(scanline16(f, y)[x+1])>dead) i++;
+	if(r16(scanline16(f, y+1)[x-1])>dead) i++;
+	if(r16(scanline16(f, y+1)[x])>dead) i++;
+	if(r16(scanline16(f, y+1)[x+1])>dead) i++;
+	return i;
+}
+
+void setstate(_frame f, byte *t, int x, int y)
+{
+	int i = aroundme(f, x, y);
+
+	if(i<=1 || i>=4) t[y*f.width+x]=DYING;
+	else
+	if(i==3) t[y*f.width+x]=BORN;
+}
+
+void perform_effect(struct frame f, struct args a)
+{
+	int x,y,i,r;
+	pixel16 *p, c;
+	byte *t;
+
+	if(f.pixelformat!=16) return;
+
+	t = malloc(f.width*f.height);
+	memset(t, 0, f.width*f.height);
+
+	for(y=2; y<f.height-3; y++)
+	{
+		p = scanline16(f, y);
+		for(x=2; x<f.width-3; x++)
+		{
+			if(r16(p[x])>0)
+			{
+				setstate(f, t, x-1, y-1);
+				setstate(f, t, x, y-1);
+				setstate(f, t, x+1, y-1);
+				setstate(f, t, x-1, y);
+				setstate(f, t, x, y);
+				setstate(f, t, x+1, y);
+				setstate(f, t, x-1, y+1);
+				setstate(f, t, x, y+1);
+				setstate(f, t, x+1, y+1);
+			}
+		}
+	}
+
+	for(y=2; y<f.height-3; y++)
+	{
+		p = scanline16(f, y);
+		for(x=2; x<f.width-3; x++)
+		{
+			switch(t[y*f.width+x])
+			{
+				case BORN:
+					c = p[x];
+					r = r16(c);
+					p[x] = rgbtocolor16(r>0 ? r : 255, g16(c), b16(c));
+					break;
+				case DYING:
+					c = p[+x];
+					p[x] = rgbtocolor16(0, g16(c), b16(c));
+					break;
+			}
+		}
+	}
+	free(t);
+}