Fix for errors in node line drawing on some Intel hardware (bug #29427). This seems to be caused by a driver bug that breaks GL_LINE_STRIP drawing in combination with color changes inside the begin/end block. Simply replacing by GL_LINES seems to fix the problem and should not cause trouble for this small amount of drawing.

There has been a comment on the bug tracker about similar issues with drawing in logic buttons, this should be checked as well (Note on the bf-committers ML).

1 files changed, 17 insertions, 7 deletions

diff --git a/source/blender/editors/space_node/drawnode.c b/source/blender/editors/space_node/drawnode.c
index 4e9ac08d8c8..80d1f30209e 100644
--- a/source/blender/editors/space_node/drawnode.c
+++ b/source/blender/editors/space_node/drawnode.c
@@ -2595,18 +2595,28 @@ void node_draw_link_bezier(View2D *v2d, SpaceNode *snode, bNodeLink *link, int t
 			glEnd();
 		}
 		
-		UI_ThemeColor(th_col1);
 		glLineWidth(1.5f);
-		
-		glBegin(GL_LINE_STRIP);
-		for(i=0; i<=LINK_RESOL; i++) {
-			if(do_shaded) {
+		if(do_shaded) {
+			glBegin(GL_LINES);
+			for(i=0; i<LINK_RESOL; i++) {
 				UI_ThemeColorBlend(th_col1, th_col2, spline_step);
+				glVertex2fv(coord_array[i]);
+				
+				UI_ThemeColorBlend(th_col1, th_col2, spline_step+dist);
+				glVertex2fv(coord_array[i+1]);
+				
 				spline_step += dist;
 			}
-			glVertex2fv(coord_array[i]);
+			glEnd();
+		}
+		else {
+			UI_ThemeColor(th_col1);
+			glBegin(GL_LINE_STRIP);
+			for(i=0; i<=LINK_RESOL; i++) {
+				glVertex2fv(coord_array[i]);
+			}
+			glEnd();
 		}
-		glEnd();
 		
 		glDisable(GL_LINE_SMOOTH);