shithub: libgraphics

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render: clip the triangle bbox against the wr directly at the tiler.

--- a/render.c

+++ b/render.c

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

 	Vertex v;

 	Shaderparams fsp;

 	Triangle2 t;

-	Rectangle bbox;

 	Point p, dp, Δp, p0, p1;

 	Point3 bc;

 	Color c;

@@ -306,15 +305,9 @@

 		t.p0 = Pt2(prim->v[0].p.x, prim->v[0].p.y, 1);

 		t.p1 = Pt2(prim->v[1].p.x, prim->v[1].p.y, 1);

 		t.p2 = Pt2(prim->v[2].p.x, prim->v[2].p.y, 1);

-		/* find the triangle's bbox and clip it against our wr */

-		bbox.min.x = min(min(t.p0.x, t.p1.x), t.p2.x);

-		bbox.min.y = min(min(t.p0.y, t.p1.y), t.p2.y);

-		bbox.max.x = max(max(t.p0.x, t.p1.x), t.p2.x)+1;

-		bbox.max.y = max(max(t.p0.y, t.p1.y), t.p2.y)+1;

-		rectclip(&bbox, task->wr);

-		for(p.y = bbox.min.y; p.y < bbox.max.y; p.y++)

-		for(p.x = bbox.min.x; p.x < bbox.max.x; p.x++){

+		for(p.y = task->wr.min.y; p.y < task->wr.max.y; p.y++)

+		for(p.x = task->wr.min.x; p.x < task->wr.max.x; p.x++){

 			bc = _barycoords(t, Pt2(p.x+0.5,p.y+0.5,1));

 			if(bc.x < 0 || bc.y < 0 || bc.z < 0)

 				continue;

@@ -483,7 +476,6 @@

 						*newparams = *params;

 						task = emalloc(sizeof *task);

 						task->params = newparams;

-						task->wr = wr[i];

 						task->p = *p;

 						task->p.v[0] = dupvertex(&p->v[0]);

 						sendp(taskchans[i], task);

@@ -578,7 +570,8 @@

 							*newparams = *params;

 							task = emalloc(sizeof *task);

 							task->params = newparams;

-							task->wr = wr[i];

+							task->wr = bbox;

+							rectclip(&task->wr, wr[i]);

 							task->p = *p;

 							task->p.v[0] = dupvertex(&p->v[0]);

 							task->p.v[1] = dupvertex(&p->v[1]);