#version 300 es
// Fullscreen triangle for the terrain raymarcher (the WebGL port of terrain.vert).
precision highp float;

out vec2 v_uv;

void main() {
    vec2 p = vec2(float((gl_VertexID << 1) & 2), float(gl_VertexID & 2));
    v_uv = p;
    gl_Position = vec4(p.x * 2.0 - 1.0, 1.0 - p.y * 2.0, 0.0, 1.0);
}