💿🐜 Antkeeper source code
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321 lines
9.0 KiB
321 lines
9.0 KiB
/*
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* Copyright (C) 2017-2019 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 "terrain-system.hpp"
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#include "graphics/vertex-format.hpp"
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TerrainSystem::TerrainSystem(ComponentManager* componentManager):
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System(componentManager),
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terrainCreationGroup(componentManager),
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terrainGroup(componentManager)
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{
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terrainCreationGroup.addGroupObserver(this);
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terrainGroup.addGroupObserver(this);
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patchSize = 1.0f;
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}
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TerrainSystem::~TerrainSystem()
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{}
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void TerrainSystem::update(float t, float dt)
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{
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auto members = terrainGroup.getMembers();
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for (const TerrainGroup::Member* member: *members)
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{
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ModelComponent* model = std::get<0>(member->components);
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TerrainPatchComponent* patch = std::get<1>(member->components);
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TransformComponent* transform = std::get<2>(member->components);
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transform->transform.translation = Vector3(std::get<0>(patch->position), 0.0f, std::get<1>(patch->position)) * patchSize;
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}
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}
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void TerrainSystem::setPatchSize(float size)
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{
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patchSize = size;
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}
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void TerrainSystem::memberRegistered(const TerrainCreationGroup::Member* member)
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{
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TerrainPatchComponent* patch = std::get<0>(member->components);
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TransformComponent* transform = std::get<1>(member->components);
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// Generate a subdivided plane mesh
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TriangleMesh* patchMesh = generatePlane(patch->subdivisions);
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// Generate a model from the subdivided plane
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Model* patchModel = generateModel(patchMesh);
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// Add model component to the entity
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ModelComponent* model = new ModelComponent();
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model->model.setModel(patchModel);
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componentManager->addComponent(member->entity, model);
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// Set scale of the transform component
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transform->transform.scale = Vector3(patchSize, 1.0f, patchSize);
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transform->transform.translation = Vector3(std::get<0>(patch->position), 0.0f, std::get<1>(patch->position)) * patchSize;
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}
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void TerrainSystem::memberUnregistered(const TerrainCreationGroup::Member* member)
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{}
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void TerrainSystem::memberRegistered(const TerrainGroup::Member* member)
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{
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// Add terrain patch to the patch map
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TerrainPatchComponent* patch = std::get<1>(member->components);
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patchMap[patch->position] = member;
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}
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void TerrainSystem::memberUnregistered(const TerrainGroup::Member* member)
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{
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// Remove terrain patch from the patch map
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TerrainPatchComponent* patch = std::get<1>(member->components);
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auto it = patchMap.find(patch->position);
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if (it != patchMap.end())
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{
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patchMap.erase(it);
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}
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// TODO: free created terrain patch model
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}
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TriangleMesh* TerrainSystem::generatePlane(int subdivisions)
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{
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//std::size_t quadCount = std::pow(4, subdivisions);
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//std::size_t triangleCount = quadCount * 2;
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std::size_t columns = std::pow(2, subdivisions);
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std::size_t rows = columns;
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std::size_t vertexCount = (columns + 1) * (rows + 1);
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float vertexIncrement = 1.0f / static_cast<float>(columns);
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// Generate vertices
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std::vector<Vector3> vertices;
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Vector3 position(0.0f);
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position.z = -0.5f;
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for (std::size_t i = 0; i <= rows; ++i)
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{
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position.x = -0.5f;
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for (std::size_t j = 0; j <= columns; ++j)
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{
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vertices.push_back(position);
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position.x += vertexIncrement;
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}
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position.z += vertexIncrement;
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}
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// Generate indices
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std::vector<std::size_t> indices;
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for (std::size_t i = 0; i < rows; ++i)
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{
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for (std::size_t j = 0; j < columns; ++j)
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{
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unsigned int a = i * (columns + 1) + j;
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unsigned int b = (i + 1) * (columns + 1) + j;
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unsigned int c = i * (columns + 1) + j + 1;
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unsigned int d = (i + 1) * (columns + 1) + j + 1;
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indices.push_back(a);
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indices.push_back(b);
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indices.push_back(c);
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indices.push_back(c);
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indices.push_back(b);
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indices.push_back(d);
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}
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}
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return new TriangleMesh(vertices, indices);
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}
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Model* TerrainSystem::generateModel(TriangleMesh* mesh)
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{
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std::size_t triangleCount = mesh->getTriangles()->size();
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// Vertex position + vertex normal
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std::size_t vertexSize = 3 + 3;
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std::size_t vertexCount = triangleCount * 3;
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#if defined(DEBUG)
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const Vector3 barycentricCoordinates[3] =
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{
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Vector3(1, 0, 0),
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Vector3(0, 1, 0),
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Vector3(0, 0, 1)
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};
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vertexSize += 3;
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#endif // DEBUG
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// Generate vertex data
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float* vertexData = new float[vertexSize * vertexCount];
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float* v = vertexData;
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for (std::size_t i = 0; i < triangleCount; ++i)
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{
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const TriangleMesh::Triangle* triangle = (*mesh->getTriangles())[i];
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const TriangleMesh::Vertex* a = triangle->edge->vertex;
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const TriangleMesh::Vertex* b = triangle->edge->next->vertex;
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const TriangleMesh::Vertex* c = triangle->edge->previous->vertex;
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const TriangleMesh::Vertex* abc[] = {a, b, c};
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const Vector3& normal = triangle->normal;
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for (std::size_t j = 0; j < 3; ++j)
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{
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*(v++) = abc[j]->position[0];
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*(v++) = abc[j]->position[1];
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*(v++) = abc[j]->position[2];
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*(v++) = normal.x;
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*(v++) = normal.y;
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*(v++) = normal.z;
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#if defined(DEBUG)
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{
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*(v++) = barycentricCoordinates[j].x;
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*(v++) = barycentricCoordinates[j].y;
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*(v++) = barycentricCoordinates[j].z;
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}
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#endif // DEBUG
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}
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// Calculate smoothed vertex normal
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/*
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Vector3 normal(0.0f);
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TriangleMesh::Edge* start = vertex->edge;
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TriangleMesh::Edge* e = start;
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do
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{
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normal += e->triangle->normal;
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e = e->previous->symmetric;
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}
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while (e != start && e != nullptr);
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normal = glm::normalize(normal);
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*/
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}
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// Generate index data
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std::size_t indexCount = triangleCount * 3;
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std::uint32_t* indexData = new std::uint32_t[indexCount];
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std::uint32_t* index = indexData;
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for (std::size_t i = 0; i < triangleCount; ++i)
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{
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*(index++) = i * 3;
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*(index++) = i * 3 + 1;
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*(index++) = i * 3 + 2;
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}
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// Calculate AABB bounds
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AABB bounds;
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bounds.setMin(mesh->getVertices()->front()->position);
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bounds.setMax(mesh->getVertices()->front()->position);
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for (TriangleMesh::Vertex* vertex: *mesh->getVertices())
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{
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bounds.add(vertex->position);
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}
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GLuint vao;
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GLuint vbo;
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GLuint ibo;
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// Generate and bind VAO
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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// Generate and bind VBO, then upload vertex data
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glGenBuffers(1, &vbo);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertexSize * vertexCount, vertexData, GL_STATIC_DRAW);
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// Setup vertex attribute arrays
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std::size_t attribOffset = 0;
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std::size_t attribSize = 0;
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// Vertex position attribute
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attribSize = 3;
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glEnableVertexAttribArray(VERTEX_POSITION);
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glVertexAttribPointer(VERTEX_POSITION, attribSize, GL_FLOAT, GL_FALSE, sizeof(float) * vertexSize, (char*)0 + attribOffset * sizeof(float));
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attribOffset += attribSize;
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// Vertex normal attribute
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attribSize = 3;
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glEnableVertexAttribArray(VERTEX_NORMAL);
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glVertexAttribPointer(VERTEX_NORMAL, attribSize, GL_FLOAT, GL_FALSE, sizeof(float) * vertexSize, (char*)0 + attribOffset * sizeof(float));
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attribOffset += attribSize;
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#if defined(DEBUG)
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{
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// Vertex barycentric coordinates attribute
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attribSize = 3;
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glEnableVertexAttribArray(VERTEX_BARYCENTRIC);
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glVertexAttribPointer(VERTEX_BARYCENTRIC, attribSize, GL_FLOAT, GL_FALSE, sizeof(float) * vertexSize, (char*)0 + attribOffset * sizeof(float));
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attribOffset += attribSize;
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}
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#endif // DEBUG
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// Generate and bind IBO, then upload index data
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glGenBuffers(1, &ibo);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(std::uint32_t) * indexCount, indexData, GL_STATIC_DRAW);
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// Delete vertex and index data
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delete[] vertexData;
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delete[] indexData;
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// Create model
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Model* model = new Model();
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// Set model buffers
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model->setVAO(vao);
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model->setVBO(vbo);
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model->setIBO(ibo);
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// Set model bounds
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model->setBounds(bounds);
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// Create model material
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Material* material = new Material();
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material->setShader(nullptr);
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ShaderVariable<Vector3>* albedo = material->addVariable<Vector3>("albedo");
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ShaderVariable<float>* roughness = material->addVariable<float>("roughness");
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ShaderVariable<float>* metalness = material->addVariable<float>("metalness");
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ShaderVariable<float>* opacity = material->addVariable<float>("opacity");
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albedo->setValue(Vector3(frand(0.0f, 1.0f), frand(0.0f, 1.0f), frand(0.0, 1.0f)));
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roughness->setValue(0.5f);
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metalness->setValue(0.0f);
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opacity->setValue(1.0f);
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// Create model group
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Model::Group* group = new Model::Group();
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group->name = std::string();
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group->material = material;
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group->indexOffset = 0;
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group->triangleCount = triangleCount;
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// Add model group to the model
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model->addGroup(group);
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return model;
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}
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void TerrainSystem::projectMesh(TriangleMesh* mesh)
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{
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}
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