#version 450 core
// Fullscreen triangle from gl_VertexID; draw with 3 vertices, no buffers.
out vec2 vUV;
void main() {
    vec2 p = vec2(float((gl_VertexID << 1) & 2), float(gl_VertexID & 2));
    vUV = p;
    gl_Position = vec4(p * 2.0 - 1.0, 0.0, 1.0);
}