Setup multiple target basic shaders

shader/dualTwoD/ellipse.frag

@@ -0,0 +1,16 @@
+#version 430 core
+in vec4 gColC;
+in vec4 gColE;
+in vec3 gPos;
+in vec2 gBoundingBox;
+
+layout (location=0) out vec4 fCol;
+layout (location=1) out vec3 fPos;
+
+void main()
+{
+  float d = dot(gBoundingBox,gBoundingBox);
+  if ( d > 1) { discard; }
+  fCol = mix (gColE , gColC, d);
+  fPos = vPos;
+}