#shader vertex
in vec2 in_position;
out vec2 position;
void main() {
  position = in_position;
  gl_Position = vec4(in_position + 1.0, 0.0, 3.0);
}

#shader fragment

precision mediump float;
in vec2 position;
out vec4 color;
uniform float blue;

void main() {
  color = vec4(position, 1.0, 1.0);
}