godot/modules/chibi/cp_envelope.cpp

/*************************************************************************/
/*  cp_envelope.cpp                                                      */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#include "cp_envelope.h"

CPEnvelope::CPEnvelope() {

	reset();
}

void CPEnvelope::reset() {

	on = false;
	carry = false;
	loop_on = false;
	loop_begin_node = 0;
	loop_end_node = 0;
	sustain_loop_on = false;
	sustain_loop_begin_node = 0;
	sustain_loop_end_node = 0;
	node_count = 0;
}

int CPEnvelope::get_height_at_pos(int pos) {

	if (node_count && pos > node[node_count - 1].tick_offset)
		return node[node_count - 1].value;

	int begin_x, begin_y;
	int end_x, end_y, xdif;
	int count = 0;
	int limit = -1;

	if (node_count < 2) return NO_POINT;

	while ((count < node_count) && (limit == -1)) {

		if (node[count].tick_offset >= pos) limit = count;
		count++;
	}

	if (pos == 0) return node[0].value;

	if (limit == -1) return NO_POINT;

	begin_x = node[limit - 1].tick_offset;
	end_x = node[limit].tick_offset;
	begin_y = node[limit - 1].value;
	end_y = node[limit].value;

	xdif = end_x - begin_x;
	return begin_y + ((pos - begin_x) * (end_y - begin_y)) / (xdif ? xdif : 1);
}

/*
int CPEnvelope::get_fx_height_at_pos(int pos) {

	if (node_count && pos>node[node_count-1].tick_offset)
		return node[node_count-1].value<<FX_HEIGHT_BITS;
	
	int begin_x,begin_y;
	int end_x,end_y,xdif;
	int count=0;
	int limit=-1;

	if (node_count<2) return NO_POINT;

	while ((count<node_count) && (limit==-1)) {

		if (node[count].tick_offset>=pos) limit=count;
		count++;
	}

	if (pos==0) return node[0].value<<FX_HEIGHT_BITS;

	if (limit==-1) return NO_POINT;

	begin_x=node[limit-1].tick_offset;
	end_x=node[limit].tick_offset;
	begin_y=node[limit-1].value;
	end_y=node[limit].value;

	xdif=end_x-begin_x;
	return (begin_y<<FX_HEIGHT_BITS)+((pos-begin_x)*(end_y-begin_y)*(int)(1<<FX_HEIGHT_BITS))/(xdif?xdif:1);
}
*/

float CPEnvelope::get_interp_height_at_pos(float pos) {

	if (node_count && pos > node[node_count - 1].tick_offset)
		return node[node_count - 1].value;

	int begin_x, begin_y;
	int end_x, end_y, xdif;
	int count = 0;
	int limit = -1;

	if (node_count < 2) return NO_POINT;

	while ((count < node_count) && (limit == -1)) {

		if (node[count].tick_offset >= pos) limit = count;
		count++;
	}

	if (pos == 0) return node[0].value;

	if (limit == -1) return NO_POINT;

	begin_x = node[limit - 1].tick_offset;
	end_x = node[limit].tick_offset;
	begin_y = node[limit - 1].value;
	end_y = node[limit].value;

	xdif = end_x - begin_x;
	return begin_y + ((pos - begin_x) * (end_y - begin_y)) / (xdif ? xdif : 1);
}

void CPEnvelope::set_position(int p_node, int p_x, int p_y) {

	if (p_node >= node_count) return;

	if (p_node == 0) {

		p_x = 0;

	} else if (p_x <= node[p_node - 1].tick_offset) {

		p_x = node[p_node - 1].tick_offset + 1;

	} else if ((p_node < (node_count - 1)) && (p_x >= node[p_node + 1].tick_offset)) {

		p_x = node[p_node + 1].tick_offset - 1;
	}

	if (p_x >= 9999) p_x = 9999;

	if (p_y > max_value) p_y = max_value;
	if (p_y < min_value) p_y = min_value;

	node[p_node].tick_offset = p_x;
	node[p_node].value = p_y;
}

int CPEnvelope::add_position(int p_x, int p_y, bool p_move_loops) {

	if (node_count == MAX_POINTS) return -1;

	int i, new_node;

	// if this is assigning an existing node, let's quit.
	for (i = 0; i < node_count; i++)
		if (p_x == node[i].tick_offset) return -1;

	i = 0;
	while ((i < node_count) && (p_x >= node[i].tick_offset))
		i++;

	new_node = i;
	node_count++;

	if (p_move_loops) {
		if (loop_begin_node >= new_node) loop_begin_node++;
		if (loop_end_node >= new_node) loop_end_node++;
		if (sustain_loop_begin_node >= new_node) sustain_loop_begin_node++;
		if (sustain_loop_end_node >= new_node) sustain_loop_end_node++;
	}
	for (i = node_count - 1; i > new_node; i--)
		node[i] = node[i - 1];

	set_position(new_node, p_x, p_y);

	return new_node;
}

void CPEnvelope::set_loop_begin(int pos) {

	if ((pos < 0) || (pos >= node_count)) return;

	loop_begin_node = pos;

	if (loop_end_node < loop_begin_node) loop_end_node = loop_begin_node;
}

void CPEnvelope::set_loop_end(int pos) {

	if ((pos < 0) || (pos >= node_count)) return;

	loop_end_node = pos;

	if (loop_end_node < loop_begin_node) loop_begin_node = loop_end_node;
}

void CPEnvelope::set_sustain_loop_begin(int pos) {

	if ((pos < 0) || (pos >= node_count)) return;

	sustain_loop_begin_node = pos;

	if (sustain_loop_end_node < sustain_loop_begin_node) sustain_loop_end_node = sustain_loop_begin_node;
}

void CPEnvelope::set_sustain_loop_end(int pos) {

	if ((pos < 0) || (pos >= node_count)) return;

	sustain_loop_end_node = pos;

	if (sustain_loop_end_node < sustain_loop_begin_node) sustain_loop_begin_node = sustain_loop_end_node;
}

void CPEnvelope::set_loop_enabled(bool p_enabled) {

	loop_on = p_enabled;
}
bool CPEnvelope::is_loop_enabled() {

	return loop_on;
}

void CPEnvelope::set_sustain_loop_enabled(bool p_enabled) {

	sustain_loop_on = p_enabled;
}
bool CPEnvelope::is_sustain_loop_enabled() {

	return sustain_loop_on;
}

void CPEnvelope::del_position(int p_node) {

	if ((node_count < 3) || (p_node <= 0) || (p_node >= node_count)) return;

	int i;

	if (loop_begin_node >= p_node) loop_begin_node--;
	if (loop_end_node >= p_node) loop_end_node--;
	if (sustain_loop_begin_node >= p_node) sustain_loop_begin_node--;
	if (sustain_loop_end_node >= p_node) sustain_loop_end_node--;

	for (i = p_node; i < node_count - 1; i++)
		node[i] = node[i + 1];

	node_count--;
}

uint8_t CPEnvelope::get_loop_begin() {

	return loop_begin_node;
}
uint8_t CPEnvelope::get_loop_end() {

	return loop_end_node;
}

uint8_t CPEnvelope::get_sustain_loop_begin() {

	return sustain_loop_begin_node;
}
uint8_t CPEnvelope::get_sustain_loop_end() {

	return sustain_loop_end_node;
}

void CPEnvelope::set_enabled(bool p_enabled) {

	on = p_enabled;
}

bool CPEnvelope::is_enabled() {

	return on;
}

void CPEnvelope::set_carry_enabled(bool p_enabled) {

	carry = p_enabled;
}
bool CPEnvelope::is_carry_enabled() {

	return carry;
}

uint8_t CPEnvelope::get_node_count() {

	return node_count;
}

const CPEnvelope::Point &CPEnvelope::get_node(int p_idx) {

	if (p_idx < 0 || p_idx >= node_count)
		return node[node_count - 1];

	return node[p_idx];
}