- bug fix #304

  Wire rendering gave errors with parts.
  This due to the fact the lines are clipped exactly at the pixel
  centers of the image edge. For polys (triangles) that works fine, but
  in wireframe you see the lines ending at the edge.

  Solved by adjusting clipping routine for wires just a tinsy bit.

1 files changed, 13 insertions, 8 deletions

diff --git a/source/blender/render/intern/source/zbuf.c b/source/blender/render/intern/source/zbuf.c
index 1cbe015731a..608b274de41 100644
--- a/source/blender/render/intern/source/zbuf.c
+++ b/source/blender/render/intern/source/zbuf.c
@@ -1569,25 +1569,30 @@ static void clipp(float *v1, float *v2, int b1, int *b2, int *b3, int a)
 static int clipline(float *v1, float *v2)	/* return 0: do not draw */
 {
 	float dz,dw, u1=0.0, u2=1.0;
-	float dx, dy;
+	float dx, dy, v13;
 
 	dz= v2[2]-v1[2];
 	dw= v2[3]-v1[3];
 
+	/* this 1.01 is for clipping x and y just a tinsy larger. that way it is
+	   filled in with zbufwire correctly when rendering in parts. otherwise
+	   you see line endings at edges... */
+
 	if(cliptestf(-dz-dw, v1[3]+v1[2], &u1,&u2)) {
 		if(cliptestf(dz-dw, v1[3]-v1[2], &u1,&u2)) {
 
 			dx= v2[0]-v1[0];
-			dz= v2[3]-v1[3];
-		
-			if(cliptestf(-dx-dz, v1[0]+v1[3], &u1,&u2)) {
-				if(cliptestf(dx-dz, v1[3]-v1[0], &u1,&u2)) {
+			dz= 1.01*(v2[3]-v1[3]);
+			v13= 1.01*v1[3];
+			
+			if(cliptestf(-dx-dz, v1[0]+v13, &u1,&u2)) {
+				if(cliptestf(dx-dz, v13-v1[0], &u1,&u2)) {
 
 					dy= v2[1]-v1[1];
 				
-					if(cliptestf(-dy-dz,v1[1]+v1[3],&u1,&u2)) {
-						if(cliptestf(dy-dz,v1[3]-v1[1],&u1,&u2)) {
-						
+					if(cliptestf(-dy-dz, v1[1]+v13, &u1,&u2)) {
+						if(cliptestf(dy-dz, v13-v1[1], &u1,&u2)) {
+							
 							if(u2<1.0) {
 								v2[0]= v1[0]+u2*dx;
 								v2[1]= v1[1]+u2*dy;