splash-state.cpp

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/*
 * Copyright (C) 2023  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 "game/states/splash-state.hpp"
#include "game/game.hpp"
#include "game/states/main-menu-state.hpp"
#include <engine/animation/animation.hpp>
#include <engine/animation/animator.hpp>
#include <engine/animation/ease.hpp>
#include <engine/animation/screen-transition.hpp>
#include <engine/debug/log.hpp>
#include <engine/math/vector.hpp>
#include <engine/render/material-flags.hpp>
#include <engine/resources/resource-manager.hpp>
#include <engine/gl/pipeline.hpp>
 
splash_state::splash_state(::game& ctx):
    game_state(ctx)
{
    debug::log_trace("Entering splash state...");
    
    const math::fvec2 viewport_size = math::fvec2(ctx.window->get_viewport_size());
    const math::fvec2 viewport_center = viewport_size * 0.5f;
    
    // Load splash texture
    auto splash_texture = ctx.resource_manager->load<gl::texture_2d>("splash.tex");
    
    // Get splash texture dimensions
    const auto& splash_dimensions = splash_texture->get_image_view()->get_image()->get_dimensions();
    
    // Construct splash billboard material
    splash_billboard_material = std::make_shared<render::material>();
    splash_billboard_material->set_blend_mode(render::material_blend_mode::translucent);
    splash_billboard_material->set_shader_template(ctx.resource_manager->load<gl::shader_template>("ui-element-textured.glsl"));
    splash_billboard_material->set_variable("background", std::make_shared<render::matvar_texture_2d>(1, splash_texture));
    
    auto splash_tint = std::make_shared<render::matvar_fvec4>(1, math::fvec4{1, 1, 1, 0});
    splash_billboard_material->set_variable("tint", splash_tint);
    
    // Construct splash billboard
    splash_billboard.set_material(splash_billboard_material);
    splash_billboard.set_scale({static_cast<float>(splash_dimensions[0]) * 0.5f, static_cast<float>(splash_dimensions[1]) * 0.5f, 1.0f});
    splash_billboard.set_translation({std::round(viewport_center.x()), std::round(viewport_center.y()), 0.0f});
    
    // Add splash billboard to UI scene
    ctx.ui_scene->add_object(splash_billboard);
    
    // Load animation timing configuration
    const float splash_fade_in_duration = 0.5;
    const float splash_duration = 2.0;
    const float splash_fade_out_duration = 0.5;
    
    // Construct splash fade in animation
    splash_fade_in_animation.set_interpolator(ease<float>::out_cubic);
    animation_channel<float>* splash_fade_in_opacity_channel = splash_fade_in_animation.add_channel(0);
    splash_fade_in_opacity_channel->insert_keyframe({0.0f, 0.0f});
    splash_fade_in_opacity_channel->insert_keyframe({splash_fade_in_duration, 1.0f});
    splash_fade_in_opacity_channel->insert_keyframe({splash_fade_in_duration + splash_duration, 1.0f});
    
    // Build splash fade out animation
    splash_fade_out_animation.set_interpolator(ease<float>::out_cubic);
    animation_channel<float>* splash_fade_out_opacity_channel = splash_fade_out_animation.add_channel(0);
    splash_fade_out_opacity_channel->insert_keyframe({0.0f, 1.0f});
    splash_fade_out_opacity_channel->insert_keyframe({splash_fade_out_duration, 0.0f});
    
    // Setup animation frame callbacks
    auto set_splash_opacity = [splash_tint](int channel, const float& opacity)
    {
        splash_tint->set(math::fvec4{1, 1, 1, opacity});
    };
    splash_fade_in_animation.set_frame_callback(set_splash_opacity);
    splash_fade_out_animation.set_frame_callback(set_splash_opacity);
    
    // Trigger splash fade out animation when splash fade in animation ends
    splash_fade_in_animation.set_end_callback
    (
        [this]()
        {
            this->splash_fade_out_animation.play();
        }
    );
    
    // Trigger a state change when the splash fade out animation ends
    splash_fade_out_animation.set_end_callback
    (
        [&ctx]()
        {
            // Queue change to main menu state
            ctx.function_queue.push
            (
                [&ctx]()
                {
                    ctx.state_machine.pop();
                    ctx.state_machine.emplace(std::make_unique<main_menu_state>(ctx, true));
                }
            );
        }
    );
    
    // Add splash fade animations to animator
    ctx.animator->add_animation(&splash_fade_in_animation);
    ctx.animator->add_animation(&splash_fade_out_animation);
    
    // Start splash fade in animation
    splash_fade_in_animation.play();
    
    // Setup window resized callback
    window_resized_subscription = ctx.window->get_resized_channel().subscribe
    (
        [&](const auto& event)
        {
            const math::fvec2 viewport_size = math::fvec2(event.window->get_viewport_size());
            const math::fvec2 viewport_center = viewport_size * 0.5f;
            splash_billboard.set_translation({std::round(viewport_center.x()), std::round(viewport_center.y()), 0.0f});
        }
    );
    
    // Construct splash skip function
    auto skip = [&](const auto& event)
    {
        ctx.function_queue.emplace
        (
            [&]()
            {
                // Black out screen
                ctx.window->get_graphics_pipeline().clear_attachments(gl::color_clear_bit, {{0.0f, 0.0f, 0.0f, 0.0f}});
                ctx.window->swap_buffers();
                
                // Change to main menu state
                ctx.state_machine.pop();
                ctx.state_machine.emplace(std::make_unique<main_menu_state>(ctx, true));
            }
        );
    };
    
    // Set up splash skippers
    input_mapped_subscriptions.emplace_back
    (
        ctx.input_mapper.get_gamepad_button_mapped_channel().subscribe
        (
            skip
        )
    );
    input_mapped_subscriptions.emplace_back
    (
        ctx.input_mapper.get_key_mapped_channel().subscribe
        (
            skip
        )
    );
    input_mapped_subscriptions.emplace_back
    (
        ctx.input_mapper.get_mouse_button_mapped_channel().subscribe
        (
            skip
        )
    );
    
    // Enable splash skippers next frame
    ctx.function_queue.push
    (
        [&]()
        {
            ctx.input_mapper.connect(ctx.input_manager->get_event_dispatcher());
        }
    );
    
    debug::log_trace("Entered splash state");
}
 
splash_state::~splash_state()
{
    debug::log_trace("Exiting splash state...");
    
    // Disable splash skippers
    ctx.input_mapper.disconnect();
    input_mapped_subscriptions.clear();
    
    // Remove splash fade animations from animator
    ctx.animator->remove_animation(&splash_fade_in_animation);
    ctx.animator->remove_animation(&splash_fade_out_animation);
    
    // Remove splash billboard from UI scene
    ctx.ui_scene->remove_object(splash_billboard);
    
    debug::log_trace("Exited splash state");
}