/*************************************************************************/
/*  audio_effect_reverb.cpp                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/

#include "audio_effect_reverb.h"
#include "servers/audio_server.h"
void AudioEffectReverbInstance::process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) {

	for (int i = 0; i < 2; i++) {
		Reverb &r = reverb[i];

		r.set_predelay(base->predelay);
		r.set_predelay_feedback(base->predelay_fb);
		r.set_highpass(base->hpf);
		r.set_room_size(base->room_size);
		r.set_damp(base->damping);
		r.set_extra_spread(base->spread);
		r.set_wet(base->wet);
		r.set_dry(base->dry);
	}

	int todo = p_frame_count;
	int offset = 0;

	while (todo) {

		int to_mix = MIN(todo, Reverb::INPUT_BUFFER_MAX_SIZE);

		for (int j = 0; j < to_mix; j++) {
			tmp_src[j] = p_src_frames[offset + j].l;
		}

		reverb[0].process(tmp_src, tmp_dst, to_mix);

		for (int j = 0; j < to_mix; j++) {
			p_dst_frames[offset + j].l = tmp_dst[j];
			tmp_src[j] = p_src_frames[offset + j].r;
		}

		reverb[1].process(tmp_src, tmp_dst, to_mix);

		for (int j = 0; j < to_mix; j++) {
			p_dst_frames[offset + j].r = tmp_dst[j];
		}

		offset += to_mix;
		todo -= to_mix;
	}
}

AudioEffectReverbInstance::AudioEffectReverbInstance() {

	reverb[0].set_mix_rate(AudioServer::get_singleton()->get_mix_rate());
	reverb[0].set_extra_spread_base(0);
	reverb[1].set_mix_rate(AudioServer::get_singleton()->get_mix_rate());
	reverb[1].set_extra_spread_base(0.000521); //for stereo effect
}

Ref<AudioEffectInstance> AudioEffectReverb::instance() {
	Ref<AudioEffectReverbInstance> ins;
	ins.instance();
	ins->base = Ref<AudioEffectReverb>(this);
	return ins;
}

void AudioEffectReverb::set_predelay_msec(float p_msec) {

	predelay = p_msec;
}

void AudioEffectReverb::set_predelay_feedback(float p_feedback) {

	predelay_fb = CLAMP(p_feedback, 0, 0.98);
}
void AudioEffectReverb::set_room_size(float p_size) {

	room_size = p_size;
}
void AudioEffectReverb::set_damping(float p_damping) {

	damping = p_damping;
}
void AudioEffectReverb::set_spread(float p_spread) {

	spread = p_spread;
}

void AudioEffectReverb::set_dry(float p_dry) {

	dry = p_dry;
}
void AudioEffectReverb::set_wet(float p_wet) {

	wet = p_wet;
}
void AudioEffectReverb::set_hpf(float p_hpf) {

	hpf = p_hpf;
}

float AudioEffectReverb::get_predelay_msec() const {

	return predelay;
}
float AudioEffectReverb::get_predelay_feedback() const {

	return predelay_fb;
}
float AudioEffectReverb::get_room_size() const {

	return room_size;
}
float AudioEffectReverb::get_damping() const {

	return damping;
}
float AudioEffectReverb::get_spread() const {

	return spread;
}
float AudioEffectReverb::get_dry() const {

	return dry;
}
float AudioEffectReverb::get_wet() const {

	return wet;
}
float AudioEffectReverb::get_hpf() const {

	return hpf;
}

void AudioEffectReverb::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_predelay_msec", "msec"), &AudioEffectReverb::set_predelay_msec);
	ClassDB::bind_method(D_METHOD("get_predelay_msec"), &AudioEffectReverb::get_predelay_msec);

	ClassDB::bind_method(D_METHOD("set_predelay_feedback", "feedback"), &AudioEffectReverb::set_predelay_feedback);
	ClassDB::bind_method(D_METHOD("get_predelay_feedback"), &AudioEffectReverb::get_predelay_feedback);

	ClassDB::bind_method(D_METHOD("set_room_size", "size"), &AudioEffectReverb::set_room_size);
	ClassDB::bind_method(D_METHOD("get_room_size"), &AudioEffectReverb::get_room_size);

	ClassDB::bind_method(D_METHOD("set_damping", "amount"), &AudioEffectReverb::set_damping);
	ClassDB::bind_method(D_METHOD("get_damping"), &AudioEffectReverb::get_damping);

	ClassDB::bind_method(D_METHOD("set_spread", "amount"), &AudioEffectReverb::set_spread);
	ClassDB::bind_method(D_METHOD("get_spread"), &AudioEffectReverb::get_spread);

	ClassDB::bind_method(D_METHOD("set_dry", "amount"), &AudioEffectReverb::set_dry);
	ClassDB::bind_method(D_METHOD("get_dry"), &AudioEffectReverb::get_dry);

	ClassDB::bind_method(D_METHOD("set_wet", "amount"), &AudioEffectReverb::set_wet);
	ClassDB::bind_method(D_METHOD("get_wet"), &AudioEffectReverb::get_wet);

	ClassDB::bind_method(D_METHOD("set_hpf", "amount"), &AudioEffectReverb::set_hpf);
	ClassDB::bind_method(D_METHOD("get_hpf"), &AudioEffectReverb::get_hpf);

	ADD_GROUP("Predelay", "predelay_");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "predelay_msec", PROPERTY_HINT_RANGE, "20,500,1"), "set_predelay_msec", "get_predelay_msec");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "predelay_feedback", PROPERTY_HINT_RANGE, "0,0.98,0.01"), "set_predelay_feedback", "get_predelay_feedback");
	ADD_GROUP("", "");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "room_size", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_room_size", "get_room_size");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "damping", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_damping", "get_damping");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "spread", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_spread", "get_spread");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "hipass", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_hpf", "get_hpf");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "dry", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_dry", "get_dry");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "wet", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_wet", "get_wet");
}

AudioEffectReverb::AudioEffectReverb() {
	predelay = 150;
	predelay_fb = 0.4;
	hpf = 0;
	room_size = 0.8;
	damping = 0.5;
	spread = 1.0;
	dry = 1.0;
	wet = 0.5;
}
