noise

commit c12549a0345b8fbf781680044d79651bbbf50a02
Author: glenda <glenda@9front.local>
Date:   Fri, 20 Aug 2021 08:57:06 +0000

lets make some noise

Diffstat:
A
noise1.c
 | 
62
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
noise2.c
 | 
77
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 139 insertions(+), 0 deletions(-)
diff --git a/noise1.c b/noise1.c
@@ -0,0 +1,61 @@
+/* naive implementation */
+
+#include <u.h>
+#include <libc.h>
+
+#include <thread.h>
+#include <draw.h>
+#include <mouse.h>
+
+Image *Ibuf;
+long bn;
+u8int *buf;
+
+void
+resize(void)
+{
+	freeimage(Ibuf);
+	Ibuf = allocimage(display, screen->r, GREY8, 0, DBlack);
+	bn = Dx(Ibuf->r) * Dy(Ibuf->r);
+	buf = realloc(buf, bn);
+}
+
+void
+threadmain(int, char**)
+{
+	int rd;
+	int fps, fn;
+	long t, ot;
+	Mousectl *mctl;
+	Image *It;
+	char text[16];
+	initdraw(nil, nil, "noise");
+	mctl = initmouse(0, screen);
+	rd = open("/dev/random", OREAD);
+	It = allocimage(display, Rect(0,0,1,1), RGB24, 1, DYellow);
+	ot = time(0);
+	fn = 0;
+	fps = 0;
+	resize();
+	for(;;){
+		if (nbrecv(mctl->resizec, nil) != 0) {
+			if (getwindow(display, Refnone) < 0)
+				sysfatal("resize failed: %r");
+			resize();
+		}
+		while(nbrecv(mctl->c, nil) != 0);
+		readn(rd, buf, bn);
+		loadimage(Ibuf, Ibuf->r, buf, bn);
+		draw(screen, screen->r, Ibuf, 0, Ibuf->r.min);
+		fn++;
+		t = time(0);
+		if (t > ot) {
+			ot = t;
+			fps = fn;
+			fn = 0;
+		};
+		snprint(text, 16, "fps: %d", fps);
+		string(screen, screen->r.min, It, ZP, font, text);
+		flushimage(display, 1);
+	}
+}
+\ No newline at end of file
diff --git a/noise2.c b/noise2.c
@@ -0,0 +1,76 @@
+/* attempt at optimisation */
+
+#include <u.h>
+#include <libc.h>
+
+#include <thread.h>
+#include <draw.h>
+#include <mouse.h>
+
+Image *Ibuf;
+long bn;
+u8int *buf;
+
+void
+resize(void)
+{
+	freeimage(Ibuf);
+	Ibuf = allocimage(display, screen->r, GREY8, 0, DBlack);
+	bn = Dx(Ibuf->r) * Dy(Ibuf->r);
+	buf = realloc(buf, bn);
+}
+
+void
+procread(void *v)
+{
+	int rd;
+	Channel *c;
+	c = v;
+	rd = open("/dev/random", OREAD);
+	while(1){
+		readn(rd, buf, bn);
+		if (send(c, nil) < 0) break;
+	};
+	close(rd);
+}
+
+void
+threadmain(int, char**)
+{
+	int fps, fn;
+	long t, ot;
+	Mousectl *mctl;
+	Image *It;
+	char text[16];
+	Channel *c;
+	initdraw(nil, nil, "noise");
+	mctl = initmouse(0, screen);
+	It = allocimage(display, Rect(0,0,1,1), RGB24, 1, DYellow);
+	ot = time(0);
+	fn = 0;
+	fps = 0;
+	resize();
+	c = chancreate(sizeof(int), 0);
+	proccreate(procread, c, 8 * 1024);
+	for(;;){
+		if (nbrecv(mctl->resizec, nil) != 0) {
+			if (getwindow(display, Refnone) < 0)
+				sysfatal("resize failed: %r");
+			resize();
+		}
+		while(nbrecv(mctl->c, nil) != 0);
+		recv(c, nil);
+		loadimage(Ibuf, Ibuf->r, buf, bn);
+		draw(screen, screen->r, Ibuf, 0, Ibuf->r.min);
+		fn++;
+		t = time(0);
+		if (t > ot) {
+			ot = t;
+			fps = fn;
+			fn = 0;
+		};
+		snprint(text, 16, "fps: %d", fps);
+		string(screen, screen->r.min, It, ZP, font, text);
+		flushimage(display, 1);
+	}
+}
+\ No newline at end of file