From dc69fab1565659241eb6f2f3576076872e86c45e Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 16 Dec 2018 23:46:32 +0100
Subject: Filter weird origin vertex

The same thing occurs in computicle. I suspect some initialization /
compute shader invokation problem. On the other hand: Why would that
happen for the origin vertex and not e.g. the first or last vertex
in memory? To be investigated further.
---
 src/shader/code/geometry.glsl | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'src/shader/code/geometry.glsl')

diff --git a/src/shader/code/geometry.glsl b/src/shader/code/geometry.glsl
index 6701b41..6ecfc99 100644
--- a/src/shader/code/geometry.glsl
+++ b/src/shader/code/geometry.glsl
@@ -30,8 +30,10 @@ void emitSquareAt(vec4 position) {
 }
 
 void main() {
-	color = gs_in[0].color;
-	emitSquareAt(gl_in[0].gl_Position);
-	EndPrimitive();
+	if ( gl_in[0].gl_Position.xyz != vec3(0.,0.,0.) ) {
+		color = gs_in[0].color;
+		emitSquareAt(gl_in[0].gl_Position);
+		EndPrimitive();
+	}
 }
 )";
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