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Web Audio API based Impulse Response Generator

This is an example source code, enables the use of the ConvolverNode of the Web Audio API. The convolution based reverb is a really powerful tool, but one might not know where to get started. Typically, there is an elaborate process of recording an impulse response with real equipment in a real room, or using a program to capture a certain filter as described in this video, but if you come from OpenAL, or if you want to start from scratch real quick, you'll need a simpler

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// Public domain.
#include <glm/mat4x4.hpp>
#include <glm/gtc/matrix_transform.hpp>

  /*
	Adjustment matrix, that transforms coordinates from OpenGL NDC to Vulkan NDC.
	*/
	inline glm::mat4 gl2vk_matrix()
	{
		/*

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// see also https://www.youtube.com/watch?v=LAxHQZ8RjQ4
#include <entt/entt.hpp>
#include <glm/vec3.hpp>
#include <glm/common.hpp>
#include <tuple>

template<int O, int...V>
constexpr uint64_t qstretch(uint64_t src)
{
    return (

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// https://stackoverflow.com/questions/21520015/pdfbox-converting-inches-or-centimeters-into-the-coordinate-system

private static final int DEFAULT_USER_SPACE_UNIT_DPI = 72;

private static final float MM_TO_UNITS = 1/(10*2.54f)*DEFAULT_USER_SPACE_UNIT_DPI;

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/*
Copyright (C) 2019 Simon Schmidt

Usage of the works is permitted provided that this instrument is retained with
the works, so that any entity that uses the works is notified of this instrument.

DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY.
*/

const hyperswarm = require('hyperswarm');

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/*
Copyright (C) 2019 Simon Schmidt

Usage of the works is permitted provided that this instrument is retained with
the works, so that any entity that uses the works is notified of this instrument.

DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY.
*/

const EventEmitter = require('events');

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// Public Domain!
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.IntFunction;
import java.util.function.IntPredicate;
import org.jparsec.Parser;
import org.jparsec.Parsers;
import org.jparsec.pattern.CharPredicate;
import org.jparsec.pattern.Pattern;
import org.jparsec.pattern.Patterns;

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// Public Domain!
import io.netty.bootstrap.Bootstrap;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.ServerChannel;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

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/*
Copyright (c) 2019 Simon Schmidt

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

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package main


import "context"
import "github.com/paulmach/osm"
import "github.com/paulmach/osm/osmpbf"
import "github.com/paulmach/osm/osmxml"

import "encoding/xml"
import "fmt"