shithub: tinyrend

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render in a loop and gather stats about frame latency.

--- a/main.c

+++ b/main.c

@@ -57,7 +57,15 @@

 	Memimage *(*fshader)(FSparams*);

 };

+typedef struct Stats Stats;

+struct Stats

+{

+	uvlong min, avg, max, acc, n;

+};

+

+

+Stats fps;

 Memimage *screenfb, *fb, *zfb, *nfb, *curfb;

 double *zbuf;

 Lock zbuflk;

@@ -66,7 +74,6 @@

 Memimage *modeltex;

 Channel *drawc;

 int nprocs;

-int rendering;

 int shownormals;

 char winspec[32];

@@ -141,6 +148,16 @@

 		*dp = v;

 }

+void

+updatestats(Stats *s, uvlong v)

+{

+	s->n++;

+	s->acc += v;

+	s->avg = s->acc/s->n;

+	s->min = v < s->min || s->n == 1? v: s->min;

+	s->max = v > s->max || s->n == 1? v: s->max;

+}

+

 double

 step(double edge, double n)

 {

@@ -633,7 +650,7 @@

 		params->vshader = s->vshader;

 		params->fshader = s->fshader;

 		proccreate(shaderunit, params, mainstacksize);

-		fprint(2, "spawned su %d for elems [%d, %d)\n", params->id, i*nparts, i*nparts+nparts);

+//		fprint(2, "spawned su %d for elems [%d, %d)\n", params->id, i*nparts, i*nparts+nparts);

 	}

 	while(i--)

@@ -757,6 +774,7 @@

 	{ "triangle", vertshader, triangleshader },

 	{ "circle", vertshader, circleshader },

 	{ "box", vertshader, boxshader },

+	{ "sf", vertshader, sfshader },

 	{ "gouraud", vertshader, gouraudshader },

 	{ "toon", vertshader, toonshader },

 };

@@ -772,6 +790,16 @@

 }

 void

+drawstats(void)

+{

+	char buf[128];

+

+	/* fps stats hold latency, so max period is min frequency */

+	snprint(buf, sizeof buf, "FPS %g/%g/%g", !fps.max? 0: 1e9/fps.max, !fps.avg? 0: 1e9/fps.avg, !fps.min? 0: 1e9/fps.min);

+	stringbg(screen, Pt(screen->r.min.x+10,screen->r.max.y-20), display->black, ZP, font, buf, display->white, ZP);

+}

+

+void

 redraw(void)

 {

 	lockdisplay(display);

@@ -780,6 +808,7 @@

 	if(shownormals)

 		memimagedraw(screenfb, screenfb->r, nfb, ZP, nil, ZP, SoverD);

 	loadimage(screen, rectaddpt(screenfb->r, screen->r.min), byteaddr(screenfb, screenfb->r.min), bytesperline(screenfb->r, screenfb->depth)*Dy(screenfb->r));

+	drawstats();

 	flushimage(display, 1);

 	unlockdisplay(display);

 }

@@ -792,37 +821,18 @@

 	t0 = nanosec();

 	shade(fb, s);

 	t1 = nanosec();

-	fprint(2, "shader took %lludns\n", t1-t0);

+	updatestats(&fps, t1-t0);

 }

 void

 renderer(void *arg)

 {

-	Shader *s;

-

 	threadsetname("renderer");

-	s = arg;

-

-	render(s);

-	rendering = 0;

-	nbsendp(drawc, nil);

-	threadexits(nil);

-}

-

-void

-scrsync(void *)

-{

-	Ioproc *io;

-

-	threadsetname("scrsync");

-

-	io = ioproc();

-	while(rendering){

+	for(;;){

+		render((Shader*)arg);

 		nbsendp(drawc, nil);

-		iosleep(io, 2000);

 	}

-	closeioproc(io);

 	threadexits(nil);

 }

@@ -1002,9 +1012,7 @@

 	mulm3(proj, rota);

 	mulm3(view, proj);

-	rendering = 1;

 	proccreate(renderer, s, mainstacksize);

-	threadcreate(scrsync, nil, mainstacksize);

 	for(;;){

 		enum { MOUSE, RESIZE, KEYBOARD, DRAW };