godot/modules/chibi/cp_player_data_envelopes.cpp

/*************************************************************************/
/*  cp_player_data_envelopes.cpp                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "cp_player_data.h"

void CPPlayer::Voice_Control::start_envelope(CPEnvelope *p_envelope, Envelope_Control *p_envelope_ctrl, Envelope_Control *p_from_env) {

	if (p_from_env && p_envelope->is_carry_enabled() && !p_from_env->terminated) {

		*p_envelope_ctrl = *p_from_env;
	} else {
		p_envelope_ctrl->pos_index = 0;
		p_envelope_ctrl->status = 1;
		p_envelope_ctrl->sustain_looping = p_envelope->is_sustain_loop_enabled();
		p_envelope_ctrl->looping = p_envelope->is_loop_enabled();
		p_envelope_ctrl->terminated = false;
		p_envelope_ctrl->kill = false;
		p_envelope_ctrl->value = p_envelope->get_height_at_pos(p_envelope_ctrl->pos_index);
	}
}

bool CPPlayer::Voice_Control::process_envelope(CPEnvelope *p_envelope, Envelope_Control *p_envelope_ctrl) {

	if (!p_envelope_ctrl->active)
		return false;

	if (note_end_flags & END_NOTE_OFF) p_envelope_ctrl->sustain_looping = false;

	p_envelope_ctrl->value = p_envelope->get_height_at_pos(p_envelope_ctrl->pos_index);
	if (p_envelope_ctrl->value == CPEnvelope::NO_POINT)
		return false;

	p_envelope_ctrl->pos_index++;

	if (p_envelope_ctrl->sustain_looping) {

		if (p_envelope_ctrl->pos_index > p_envelope->get_node(p_envelope->get_sustain_loop_end()).tick_offset) {

			p_envelope_ctrl->pos_index = p_envelope->get_node(p_envelope->get_sustain_loop_begin()).tick_offset;
		}

	} else if (p_envelope_ctrl->looping) {

		if (p_envelope_ctrl->pos_index > p_envelope->get_node(p_envelope->get_loop_end()).tick_offset) {

			p_envelope_ctrl->pos_index = p_envelope->get_node(p_envelope->get_loop_begin()).tick_offset;
		}
	}

	if (p_envelope_ctrl->pos_index > p_envelope->get_node(p_envelope->get_node_count() - 1).tick_offset) {

		p_envelope_ctrl->terminated = true;
		p_envelope_ctrl->pos_index = p_envelope->get_node(p_envelope->get_node_count() - 1).tick_offset;
		if (p_envelope->get_node(p_envelope->get_node_count() - 1).value == 0) p_envelope_ctrl->kill = true;
	}

	return true;
}