shithub: libgraphics

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render: improve line raster (not fixed yet). also tag jobs with an id.

--- a/graphics.h

+++ b/graphics.h

@@ -195,6 +195,7 @@

 struct Renderjob

 {

 	Ref;

+	uvlong id;

 	Framebuf *fb;

 	Scene *scene;

 	Shadertab *shaders;

@@ -248,7 +249,7 @@

 	struct {

 		double n, f;	/* near and far clipping planes */

 	} clip;

-	Matrix3 proj;		/* VCS to NDC xform */

+	Matrix3 proj;		/* VCS to clip space xform */

 	Projection projtype;

 	struct {

--- a/render.c

+++ b/render.c

@@ -226,19 +226,16 @@

 		e = 0;

 		Δy = p1.y > p0.y? 1: -1;

-		/* TODO find out why sometimes lines go invisible depending on their location */

-

 		for(p = p0; p.x <= p1.x; p.x++){

 			Δp = subpt(p, p0);

 			dplen = hypot(dp.x, dp.y);

 			perc = dplen == 0? 0: hypot(Δp.x, Δp.y)/dplen;

-			if(steep) swapi(&p.x, &p.y);

-

+			/* TODO it seems depth testing messes with the output. find out why */

 			z = flerp(prim.v[0].p.z, prim.v[1].p.z, perc);

 			depth = fclamp(z, 0, 1);

 			if(depth <= params->fb->zb[p.x + p.y*Dx(params->fb->r)])

-				break;

+				continue;

 			params->fb->zb[p.x + p.y*Dx(params->fb->r)] = depth;

 			/* interpolate z⁻¹ and get actual z */

@@ -249,6 +246,8 @@

 			perc *= prim.v[0].p.w * z;

 			lerpvertex(&fsp.v, &prim.v[0], &prim.v[1], perc);

+			if(steep) swapi(&p.x, &p.y);

+

 			fsp.p = p;

 			c = params->fshader(&fsp);

 			memfillcolor(params->frag, col2ul(c));

@@ -639,11 +638,12 @@

 	Entity *ent;

 	SUparams *params;

 	Channel *paramsc;

-	uvlong time;

+	uvlong time, lastid;

 	threadsetname("renderer");

 	jobc = arg;

+	lastid = 0;

 	paramsc = chancreate(sizeof(SUparams*), 8);

 	proccreate(entityproc, paramsc, mainstacksize);

@@ -651,6 +651,7 @@

 	while((job = recvp(jobc)) != nil){

 		time = nanosec();

 		job->times.R.t0 = time;

+		job->id = lastid++;

 		sc = job->scene;

 		if(sc->nents < 1){

 			nbsend(job->donec, nil);