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/collide.glsl  | 2 +-
 src/shader/code/geometry.glsl | 8 +++++---
 src/shader/code/vertex.glsl   | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/shader/code/collide.glsl b/src/shader/code/collide.glsl
index 936ca89..3982ad8 100644
--- a/src/shader/code/collide.glsl
+++ b/src/shader/code/collide.glsl
@@ -13,7 +13,7 @@ uniform uint nY;
 const uint  q     = 9;
 const float omega = 0.6;
 
-const float displayAmplifier = 50.;
+const float displayAmplifier = 1000.;
 
 float get(uint x, uint y, int i, int j) {
 	return collideCells[q*nX*y + q*x + (i+1)*3 + j+1];
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();
+	}
 }
 )";
diff --git a/src/shader/code/vertex.glsl b/src/shader/code/vertex.glsl
index 0727708..453b6fa 100644
--- a/src/shader/code/vertex.glsl
+++ b/src/shader/code/vertex.glsl
@@ -4,7 +4,7 @@ static const std::string VERTEX_SHADER_CODE = R"(
 layout (location=0) in vec3 VertexPosition;
 
 out VS_OUT {
-    vec3 color;
+	vec3 color;
 } vs_out;
 
 void main() {
-- 
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