shithub: libgraphics

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render: split tiles vertically instead of horizontally.

this makes more sense memory-wise, and it also fixes a
clipping glitch that was occurring at tile boundaries.

--- a/render.c

+++ b/render.c

@@ -411,7 +411,7 @@

 	Triangle *t;				/* triangles to raster */

 	Rectangle *wr;

 	Channel **taskc;

-	ulong Δx, nproc;

+	ulong Δy, nproc;

 	int i, nt;

 	uvlong t0;

@@ -444,10 +444,10 @@

 		vsp.su = params;

 		wr[0] = params->fb->r;

-		Δx = Dx(wr[0])/nproc;

-		wr[0].max.x = wr[0].min.x + Δx;

+		Δy = Dy(wr[0])/nproc;

+		wr[0].max.y = wr[0].min.y + Δy;

 		for(i = 1; i < nproc; i++)

-			wr[i] = rectaddpt(wr[i-1], Pt(Δx,0));

+			wr[i] = rectaddpt(wr[i-1], Pt(0,Δy));

 		verts = params->entity->mdl->obj->vertdata[OBJVGeometric].verts;

 		tverts = params->entity->mdl->obj->vertdata[OBJVTexture].verts;