💿🐜 Antkeeper source code
https://antkeeper.com
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175 lines
6.7 KiB
175 lines
6.7 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "vegetation-system.hpp"
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#include "game/components/model-component.hpp"
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#include "game/components/transform-component.hpp"
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#include "scene/model-instance.hpp"
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#include "scene/lod-group.hpp"
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#include "scene/collection.hpp"
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#include "renderer/material.hpp"
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#include "geometry/aabb.hpp"
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#include "utility/fundamental-types.hpp"
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#include <cmath>
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using namespace ecs;
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vegetation_system::vegetation_system(entt::registry& registry):
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entity_system(registry),
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terrain_patch_size(1.0f),
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vegetation_patch_size(1.0f),
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vegetation_patch_columns(1),
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vegetation_patch_rows(1),
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vegetation_density(1.0f),
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vegetation_model(nullptr)
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{
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registry.on_construct<terrain_component>().connect<&vegetation_system::on_terrain_construct>(this);
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registry.on_destroy<terrain_component>().connect<&vegetation_system::on_terrain_destroy>(this);
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}
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vegetation_system::~vegetation_system()
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{}
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void vegetation_system::update(double t, double dt)
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{}
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void vegetation_system::set_terrain_patch_size(float size)
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{
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terrain_patch_size = size;
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vegetation_patch_size = terrain_patch_size / static_cast<float>(vegetation_patch_columns);
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}
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void vegetation_system::set_vegetation_patch_resolution(int subdivisions)
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{
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// Determine number of vegetation patch columns and rows per terrain patch
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vegetation_patch_columns = static_cast<int>(std::pow(2, subdivisions));
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vegetation_patch_rows = vegetation_patch_columns;
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vegetation_patch_size = terrain_patch_size / static_cast<float>(vegetation_patch_columns);
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}
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void vegetation_system::set_vegetation_density(float density)
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{
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vegetation_density = density;
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}
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void vegetation_system::set_vegetation_model(::model* model)
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{
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vegetation_model = model;
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}
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void vegetation_system::set_scene(scene::collection* collection)
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{
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this->scene_collection = collection;
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}
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void vegetation_system::on_terrain_construct(entt::registry& registry, entt::entity entity, terrain_component& component)
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{
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// Find corner of terrain patch
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float terrain_patch_min_x = static_cast<float>(component.x) * terrain_patch_size - terrain_patch_size * 0.5f;
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float terrain_patch_min_z = static_cast<float>(component.z) * terrain_patch_size - terrain_patch_size * 0.5f;
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// Create vegetation patches
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for (int column = 0; column < vegetation_patch_columns; ++column)
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{
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for (int row = 0; row < vegetation_patch_rows; ++row)
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{
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/*
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// Create vegetation patch entity
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auto vegetation_patch_entity = registry.create();
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// Assign a transform component
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transform_component transform;
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transform.local = math::identity_transform<float>;
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transform.local.translation = float3{vegetation_patch_x, 0.0f, vegetation_patch_z};
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transform.warp = true;
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registry.assign_or_replace<transform_component>(vegetation_patch_entity, transform);
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// Assign a model component
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model_component model;
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model.model = vegetation_model;
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model.instance_count = 500;
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registry.assign_or_replace<model_component>(vegetation_patch_entity, model);
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*/
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// Find patch translation
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float vegetation_patch_x = terrain_patch_min_x + vegetation_patch_size * static_cast<float>(column) + vegetation_patch_size * 0.5f;
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float vegetation_patch_z = terrain_patch_min_z + vegetation_patch_size * static_cast<float>(row) + vegetation_patch_size * 0.5f;
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float3 translation = {vegetation_patch_x, 0.0f, vegetation_patch_z};
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// Generate culling mask
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aabb<float>* culling_mask = new aabb<float>(vegetation_model->get_bounds());
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culling_mask->min_point.x = std::min<float>(culling_mask->min_point.x, translation.x - vegetation_patch_size * 0.5f);
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culling_mask->min_point.z = std::min<float>(culling_mask->min_point.z, translation.z - vegetation_patch_size * 0.5f);
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culling_mask->max_point.x = std::max<float>(culling_mask->max_point.x, translation.x + vegetation_patch_size * 0.5f);
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culling_mask->max_point.z = std::max<float>(culling_mask->max_point.z, translation.z + vegetation_patch_size * 0.5f);
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std::size_t lod_count = 4;
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std::size_t instance_count_lod0 = 500;
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std::size_t instance_count_lod1 = instance_count_lod0 / 2;
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std::size_t instance_count_lod2 = instance_count_lod1 / 2;
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// Generate LOD materials
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const material* lod0_material = (*vegetation_model->get_groups())[0]->get_material();
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material* lod1_material = new material(*lod0_material);
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static_cast<material_property<int>*>(lod1_material->get_property("instance_multiplier"))->set_value(2);
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material* lod2_material = new material(*lod0_material);
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static_cast<material_property<int>*>(lod2_material->get_property("instance_multiplier"))->set_value(4);
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// Create LOD 0
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scene::model_instance* patch_lod0 = new scene::model_instance();
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patch_lod0->set_model(vegetation_model);
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patch_lod0->set_translation(translation);
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patch_lod0->set_instanced(true, instance_count_lod0);
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patch_lod0->set_culling_mask(culling_mask);
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patch_lod0->update_tweens();
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// Create LOD 1
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scene::model_instance* patch_lod1 = new scene::model_instance();
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patch_lod1->set_model(vegetation_model);
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patch_lod1->set_material(0, lod1_material);
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patch_lod1->set_translation(translation);
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patch_lod1->set_instanced(true, instance_count_lod1);
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patch_lod1->set_culling_mask(culling_mask);
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patch_lod1->update_tweens();
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// Create LOD 2
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scene::model_instance* patch_lod2 = new scene::model_instance();
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patch_lod2->set_model(vegetation_model);
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patch_lod2->set_material(0, lod2_material);
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patch_lod2->set_translation(translation);
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patch_lod2->set_instanced(true, instance_count_lod2);
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patch_lod2->set_culling_mask(culling_mask);
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patch_lod2->update_tweens();
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// Create LOD group
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scene::lod_group* lod_group = new scene::lod_group(lod_count);
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lod_group->add_object(0, patch_lod0);
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lod_group->add_object(1, patch_lod1);
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lod_group->add_object(2, patch_lod2);
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lod_group->set_translation(translation);
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lod_group->update_tweens();
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// Add LOD group to scene
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scene_collection->add_object(lod_group);
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}
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}
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}
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void vegetation_system::on_terrain_destroy(entt::registry& registry, entt::entity entity)
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{}
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