[Bf-blender-cvs] [0ee23d0f5f6] master: Fix T63452: View Port/render artifacts while camera movement in

[Antonioya]

Commit: 0ee23d0f5f613c4418a3ab2b2c67d47b936350de
Author: Antonioya
Date:   Fri Apr 12 09:09:37 2019 +0200
Branches: master
https://developer.blender.org/rB0ee23d0f5f613c4418a3ab2b2c67d47b936350de

Fix T63452: View Port/render artifacts while camera movement in

Patch provided by @matc

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M	source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl

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diff --git a/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl b/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl
index 1ebb6797f63..aa38ff26a62 100644
--- a/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl
+++ b/source/blender/draw/engines/gpencil/shaders/gpencil_stroke_geom.glsl
@@ -84,6 +84,9 @@ void main(void)
 	if (sp2.x < -area.x || sp2.x > area.x) return;
 	if (sp2.y < -area.y || sp2.y > area.y) return;
 
+	/* culling behind camera */
+	if (P1.w < 0 || P2.w < 0) return;
+
 	/* determine the direction of each of the 3 segments (previous, current, next) */
 	vec2 v0 = normalize(sp1 - sp0);
 	vec2 v1 = normalize(sp2 - sp1);