attribute vec4 a_Position;
attribute vec4 a_Color;
uniform mat4 u_ProjMatrix;
varying vec4 v_Color;
void main(){
  gl_Position = u_ProjMatrix * a_Position;
  v_Color = a_Color;
}

#ifdef GL_ES
precision mediump float;
#endif
varying vec4 v_Color;
void main(){
  gl_FragColor = v_Color;
}