deltamap 0.2.2

A simple map viewer 
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#version 100
precision highp float;

attribute vec2 position;
attribute vec2 extrusion;

uniform vec2 scale;
uniform float half_width;

varying vec2 v_extrusion;

void main() {
    gl_Position = vec4(position + extrusion * scale * half_width, 0.0, 1.0);
    v_extrusion = extrusion;
}