wesnoth/src/soundsource.cpp

/* $Id$ */
/*
   Copyright (C) 2006 - 2011 by Karol Nowak <grzywacz@sul.uni.lodz.pl>
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.

   See the COPYING file for more details.
*/

#include "global.hpp"


#include "display.hpp"
#include "foreach.hpp"
#include "log.hpp"
#include "serialization/string_utils.hpp"
#include "sound.hpp"
#include "soundsource.hpp"

namespace soundsource {

const unsigned DEFAULT_CHANCE           = 100;
const unsigned DEFAULT_DELAY            = 1000;
const unsigned DEFAULT_FULL_RANGE       = 3;
const unsigned DEFAULT_FADE_RANGE       = 14;

unsigned int positional_source::last_id = 0;

manager::manager(const display &disp) :
	observer(),
	savegame_config(),
	sources_(),
	disp_(disp)
{
	disp_.scroll_event().attach_handler(this);
	update_positions();
}

manager::~manager()
{
	for(positional_source_iterator it = sources_.begin(); it != sources_.end(); ++it) {
		delete (*it).second;
	}

	sources_.clear();
}

void manager::handle_generic_event(const std::string &event_name)
{
	if(event_name == "scrolled")
		update_positions();
}

void manager::add(const sourcespec &spec)
{
	positional_source_iterator it;

	if((it = sources_.find(spec.id())) == sources_.end()) {
		sources_[spec.id()] = new positional_source(spec);
	} else {
		delete (*it).second;
		(*it).second = new positional_source(spec);
	}
}

void manager::remove(const std::string &id)
{
	positional_source_iterator it;

	if((it = sources_.find(id)) == sources_.end())
		return;
	else {
		delete (*it).second;
		sources_.erase(it);
	}
}

void manager::update()
{
	unsigned int time = SDL_GetTicks();

	for(positional_source_iterator it = sources_.begin(); it != sources_.end(); ++it) {
		(*it).second->update(time, disp_);
	}
}

void manager::update_positions()
{
	unsigned int time = SDL_GetTicks();

	for(positional_source_iterator it = sources_.begin(); it != sources_.end(); ++it) {
		(*it).second->update_positions(time, disp_);
	}
}

void manager::write_sourcespecs(config& cfg) const
{
	for(positional_source_const_iterator i = sources_.begin(); i != sources_.end(); ++i) {
		assert(i->second);

		config& child = cfg.add_child("sound_source");
		child["id"] = i->first;
		i->second->write_config(child);
	}
}

config manager::to_config() const
{
	config cfg;
	write_sourcespecs(cfg);
	return cfg.child("sound_source");
}

positional_source::positional_source(const sourcespec &spec) :
	last_played_(0),
	min_delay_(spec.minimum_delay()),
	chance_(spec.chance()),
	loops_(spec.loops()),
	id_(last_id++),
	range_(spec.full_range()),
	faderange_(spec.fade_range()),
	check_fogged_(spec.check_fogged()),
	check_shrouded_(spec.check_shrouded()),
	files_(spec.files()),
	locations_(spec.get_locations())
{
	assert(range_ > 0);
	assert(faderange_ > 0);
}

positional_source::~positional_source()
{
	sound::reposition_sound(id_, DISTANCE_SILENT);
}

bool positional_source::is_global()
{
	return locations_.empty();
}

void positional_source::update(unsigned int time, const display &disp)
{
	if (time - last_played_ < unsigned(min_delay_) || sound::is_sound_playing(id_))
		return;

	int i = rand() % 100 + 1;

	if(i <= chance_) {
		last_played_ = time;

		// If no locations have been specified, treat the source as if
		// it was present everywhere on the map
		if(locations_.empty()) {
			sound::play_sound_positioned(files_, id_, loops_, 0);	// max volume
			return;
		}

		int distance_volume = DISTANCE_SILENT;
		for(std::vector<map_location>::iterator i = locations_.begin(); i != locations_.end(); ++i) {
			int v = calculate_volume(*i, disp);
			if(v < distance_volume) {
				distance_volume = v;
			}
		}

		if(distance_volume >= DISTANCE_SILENT)
			return;

		sound::play_sound_positioned(files_, id_, loops_, distance_volume);
	}
}

void positional_source::update_positions(unsigned int time, const display &disp)
{
	if(is_global()) {
		return;
	}

	int distance_volume = DISTANCE_SILENT;
	for(std::vector<map_location>::iterator i = locations_.begin(); i != locations_.end(); ++i) {
		int v = calculate_volume(*i, disp);
		if(v < distance_volume) {
			distance_volume = v;
		}
	}

	if(sound::is_sound_playing(id_)) {
		sound::reposition_sound(id_, distance_volume);
	} else {
		update(time, disp);
	}
}

int positional_source::calculate_volume(const map_location &loc, const display &disp)
{
	assert(range_ > 0);
	assert(faderange_ > 0);

	if((check_shrouded_ && disp.shrouded(loc)) || (check_fogged_ && disp.fogged(loc)))
		return DISTANCE_SILENT;

	SDL_Rect area = disp.map_area();
	map_location center = disp.hex_clicked_on(area.x + area.w / 2, area.y + area.h / 2);
	int distance = distance_between(loc, center);

	if(distance <= range_) {
		return 0;
	}

	return static_cast<int>((((distance - range_)
			/ static_cast<double>(faderange_)) * DISTANCE_SILENT));
}

void positional_source::write_config(config& cfg) const
{
	cfg["sounds"] = files_;
	cfg["delay"] = min_delay_;
	cfg["chance"] = chance_;
	cfg["check_fogged"] = check_fogged_;
	cfg["check_shrouded"] = check_shrouded_;
	cfg["loop"] = loops_;
	cfg["full_range"] = range_;
	cfg["fade_range"] = faderange_;
	write_locations(locations_, cfg);
}

sourcespec::sourcespec(const config& cfg) :
	id_(cfg["id"]),
	files_(cfg["sounds"]),
	min_delay_(cfg["delay"].to_int(DEFAULT_DELAY)),
	chance_(cfg["chance"].to_int(DEFAULT_CHANCE)),
	loops_(cfg["loop"]),
	range_(cfg["full_range"].to_int(3)),
	faderange_(cfg["fade_range"].to_int(14)),
	check_fogged_(cfg["check_fogged"].to_bool(true)),
	check_shrouded_(cfg["check_shrouded"].to_bool(true)),
	locations_()
{
	read_locations(cfg, locations_);
}

} // namespace soundsource