From ad4fee68ef9aefc8aed253a49cbbabe1f23162ba Mon Sep 17 00:00:00 2001
From: Thomas Friedel <tomee6@gmail.com>
Date: Mon, 5 Feb 2018 11:11:08 +0100
Subject: [PATCH] fixed a bug with the way the stencil buffer was used

---
 paths.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/paths.go b/paths.go
index e0b4f86..27266d9 100644
--- a/paths.go
+++ b/paths.go
@@ -122,7 +122,6 @@ func (cv *Canvas) Stroke() {
 	gli.StencilFunc(gl_ALWAYS, 1, 0xFF)
 	gli.StencilOp(gl_KEEP, gl_KEEP, gl_REPLACE)
 	gli.StencilMask(0x01)
-	gli.Clear(gl_STENCIL_BUFFER_BIT)
 
 	gli.UseProgram(sr.id)
 	s := cv.state.stroke
@@ -209,8 +208,11 @@ func (cv *Canvas) Stroke() {
 
 	gli.ColorMask(true, true, true, true)
 	gli.StencilOp(gl_KEEP, gl_KEEP, gl_KEEP)
-	gli.StencilMask(0xFF)
 	gli.StencilFunc(gl_EQUAL, 0, 0xFF)
+
+	gli.StencilMask(0x01)
+	gli.Clear(gl_STENCIL_BUFFER_BIT)
+	gli.StencilMask(0xFF)
 }
 
 func (cv *Canvas) lineJoint(p pathPoint, p0, p1, p2, l0p0, l0p1, l0p2, l0p3 lm.Vec2, tris []float32) []float32 {