private void buildShader() {
final Vector2 scale = new Vector2(_canvas.getCanvasRenderer().getCamera().getWidth(), _canvas
.getCanvasRenderer().getCamera().getHeight());
_wireframeShaderState = new GLSLShaderObjectsState();
_wireframeShaderState.setVertexShader(s_vert_passthru_120);
_wireframeShaderState.setGeometryShader(s_geom_wireframe_150);
_wireframeShaderState.setFragmentShader(s_frag_wireframe_120);
_wireframeShaderState.setUniform("wireColor", new ColorRGBA(0, 0, 0, 1));
_wireframeShaderState.setUniform("faceColor", new ColorRGBA(1, 1, 1, 1));