source/src/game/states/splash-state.cpp

/*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code 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 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "animation/ease.hpp"
#include "animation/screen-transition.hpp"
#include "animation/timeline.hpp"
#include "application.hpp"
#include "debug/logger.hpp"
#include "game/game-context.hpp"
#include "game/states/game-states.hpp"
#include "renderer/passes/sky-pass.hpp"
#include "scene/billboard.hpp"
#include "scene/scene.hpp"
#include <functional>

void splash_state_enter(game_context* ctx)
{
	logger* logger = ctx->logger;	
	logger->push_task("Entering splash state");
	
	// Disable sky pass
	ctx->overworld_sky_pass->set_enabled(false);
	
	// Add splash billboard to UI scene
	ctx->ui_scene->add_object(ctx->splash_billboard);
	
	// Setup timing
	const float splash_fade_in_duration = 0.5f;
	const float splash_hang_duration = 2.0f;
	const float splash_fade_out_duration = 0.5f;
	
	// Start fade in
	ctx->fade_transition->transition(splash_fade_in_duration, true, ease<float>::in_quad);
	
	// Crate fade out function
	auto fade_out = [ctx, splash_fade_out_duration]()
	{
		ctx->fade_transition->transition(splash_fade_out_duration, false, ease<float>::out_quad);
	};
	
	// Create change state function
	auto change_state = [ctx]()
	{
		ctx->app->change_state({std::bind(play_state_enter, ctx), std::bind(play_state_exit, ctx)});
	};
	
	// Schedule fade out and change state events
	timeline* timeline = ctx->timeline;
	float t = timeline->get_position();
	timeline::sequence splash_sequence =
	{
		{t + splash_fade_in_duration + splash_hang_duration, fade_out},
		{t + splash_fade_in_duration + splash_hang_duration + splash_fade_out_duration, change_state}
	};
	timeline->add_sequence(splash_sequence);
	
	logger->pop_task(EXIT_SUCCESS);
}

void splash_state_exit(game_context* ctx)
{
	logger* logger = ctx->logger;
	logger->push_task("Exiting splash state");
	
	// Remove splash billboard from UI scene
	ctx->ui_scene->remove_object(ctx->splash_billboard);
	
	logger->pop_task(EXIT_SUCCESS);
}