337 lines
9.3 KiB
C++
337 lines
9.3 KiB
C++
#include "planet/PlanetFace.h"
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#include <time.h>
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// Correlates directly to Face enum
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const glm::vec3 FACE_NORMALS[6] = {
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glm::vec3(0.0f, -1.0f, 0.0f),
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glm::vec3(0.0f, 1.0f, 0.0f),
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glm::vec3(-1.0f, 0.0f, 0.0f),
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glm::vec3(1.0f, 0.0f, 0.0f),
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glm::vec3(0.0f, 0.0f, -1.0f),
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glm::vec3(0.0f, 0.0f, 1.0f)
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};
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PlanetFaceNode::PlanetFaceNode(Planet* planet, PlanetFace* face, glm::vec3 position, const unsigned int index, const unsigned int level) :
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m_planet(planet), m_planetFace(face), m_pos(position), m_index(index), m_level(level), m_generated(false), m_dirty(true), m_leaf(true)
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{
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glm::vec3 normal = face->getNormal();
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m_left = glm::vec3(normal.y, normal.z, normal.x);
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m_forward = glm::cross(normal, m_left);
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if (level == 0)
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{
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float radius = m_planet->getRadius() / 2.0f;
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m_pos = m_pos - (m_left * radius);
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m_pos = m_pos - (m_forward * radius);
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}
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generate();
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}
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PlanetFaceNode::~PlanetFaceNode()
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{
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if (!m_leaf)
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{
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for (int i = 0; i < 4; i++)
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{
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delete m_children[i];
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}
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return;
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}
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}
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void PlanetFaceNode::tick(Camera* camera, GLfloat dtime)
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{
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// TODO: based on planet transform
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float camToOrigin = glm::distance(camera->getPosition(), (m_planet->getPosition() + m_center));
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float divisionLevel = (float)pow(2, m_level);
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float splitDistance = m_planet->getRadius() / divisionLevel;
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if (camToOrigin < splitDistance * 1.5 && m_leaf) {
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this->subdivide();
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return;
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} else if (camToOrigin > splitDistance * 2.0 && !m_leaf) {
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this->merge();
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return;
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}
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if (!m_leaf)
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{
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for (int i = 0; i < 4; i++)
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{
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m_children[i]->tick(camera, dtime);
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}
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}
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}
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void PlanetFaceNode::setIndexBuffer(PlanetBufferIndex buf) {
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PIB* indx = m_planet->getBuffers()->getBuffer(buf);
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m_ebo = indx->ebo;
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m_indices = indx->indices.size();
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}
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void PlanetFaceNode::draw(Camera* camera, Shader* shader)
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{
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// TODO: occlusion culling
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if (!m_leaf)
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{
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for (int i = 0; i < 4; i++)
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{
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m_children[i]->draw(camera, shader);
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}
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return;
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}
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if (!m_generated)
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return;
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shader->setBuffers(m_vao, m_vbo, m_ebo);
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shader->use();
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camera->shaderViewProjection(*shader);
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shader->setUniform("modelMatrix", m_planet->getTransformation());
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glDrawElements(GL_TRIANGLES, m_indices, GL_UNSIGNED_INT, nullptr);
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}
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void PlanetFaceNode::generate()
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{
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if (m_generated)
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return;
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std::vector<Vertex> vertices;
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float divisionLevel = (float)pow(2.0, m_level);
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float radius = m_planet->getRadius();
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for (int i = 0; i < RESOLUTION; i++)
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{
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for (int j = 0; j < RESOLUTION; j++)
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{
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float iindex = i / (RESOLUTION - 1.0);
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float jindex = j / (RESOLUTION - 1.0);
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// From the left and forward vectors, we can calculate an oriented vertex
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glm::vec3 iv = ((m_left * iindex) * radius) / divisionLevel;
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glm::vec3 jv = ((m_forward * jindex) * radius) / divisionLevel;
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// Add the scaled left and forward to the centered origin
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glm::vec3 vertex = m_pos + (iv + jv);
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// Normalize and multiply by radius to create a spherical mesh
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glm::vec3 vertNormal = glm::normalize(vertex);
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glm::vec3 pos = (m_planet->getNoise().fractal(m_level + 1, vertNormal.x, vertNormal.y, vertNormal.z) + radius) * vertNormal;
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// Add vertex
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vertices.push_back({ pos, vertNormal, glm::vec2(j * (1.0 / RESOLUTION), i * (1.0 / RESOLUTION)) });
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// Set center
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if ((i == RESOLUTION / 2 && j == RESOLUTION / 2))
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m_center = pos;
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}
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}
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glGenVertexArrays(1, &m_vao);
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glBindVertexArray(m_vao);
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glGenBuffers(1, &m_vbo);
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glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(Vertex) * vertices.size(), &(vertices[0]), GL_STATIC_DRAW);
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m_generated = true;
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setIndexBuffer(PlanetBufferIndex::Base);
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}
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bool PlanetFaceNode::subdivide()
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{
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if (m_level == 8)
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return false;
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int lv = m_level + 1;
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float radius = m_planet->getRadius();
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glm::vec3 stepLeft = m_left * (radius / (float)pow(2, lv));
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glm::vec3 stepForward = m_forward * (radius / (float)pow(2, lv));
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m_children[TOP_LEFT] = new PlanetFaceNode(m_planet, m_planetFace, m_pos, TOP_LEFT, lv);
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m_children[TOP_RIGHT] = new PlanetFaceNode(m_planet, m_planetFace, m_pos + stepForward, TOP_RIGHT, lv);
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m_children[BOTTOM_RIGHT] = new PlanetFaceNode(m_planet, m_planetFace, (m_pos + stepLeft) + stepForward, BOTTOM_RIGHT, lv);
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m_children[BOTTOM_LEFT] = new PlanetFaceNode(m_planet, m_planetFace, (m_pos + stepLeft), BOTTOM_LEFT, lv);
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m_leaf = false;
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for (int i = 0; i < 4; i++)
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m_children[i]->m_parent = this;
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this->dispose();
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return true;
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}
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bool PlanetFaceNode::merge()
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{
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// Leaves don't ever need to be merged
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if (m_leaf)
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return false;
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// Merge and dispose the children
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for (int i = 0; i < 4; i++)
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{
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m_children[i]->dispose();
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delete m_children[i];
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}
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// We're a leaf now
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m_leaf = true;
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generate();
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return true;
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}
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void PlanetFaceNode::dispose()
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{
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m_generated = false;
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}
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bool PlanetFaceNode::isLeaf()
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{
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return m_leaf;
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}
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void PlanetFaceNode::getNeighbors() {
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if (m_level == 0)
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{
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// The m_neighbors of root nodes never change
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if (m_neighborTop != nullptr) return;
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std::cout << m_planet->getFace(FACE_TOP)->getLODRoot() << std::endl;
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switch (m_index)
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{
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// Front face
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case FACE_FRONT:
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m_neighborTop = m_planet->getFace(FACE_TOP)->getLODRoot();
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m_neighborLeft = m_planet->getFace(FACE_LEFT)->getLODRoot();
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m_neighborRight = m_planet->getFace(FACE_RIGHT)->getLODRoot();
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m_neighborBottom = m_planet->getFace(FACE_BOTTOM)->getLODRoot();
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break;
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// Back face
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case FACE_BACK:
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m_neighborTop = m_planet->getFace(FACE_TOP)->getLODRoot();
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m_neighborLeft = m_planet->getFace(FACE_RIGHT)->getLODRoot();
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m_neighborRight = m_planet->getFace(FACE_LEFT)->getLODRoot();
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m_neighborBottom = m_planet->getFace(FACE_BOTTOM)->getLODRoot();
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break;
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// Left face
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case FACE_LEFT:
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m_neighborTop = m_planet->getFace(FACE_TOP)->getLODRoot();
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m_neighborLeft = m_planet->getFace(FACE_BACK)->getLODRoot();
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m_neighborRight = m_planet->getFace(FACE_FRONT)->getLODRoot();
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m_neighborBottom = m_planet->getFace(FACE_BOTTOM)->getLODRoot();
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break;
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// Right face
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case FACE_RIGHT:
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m_neighborTop = m_planet->getFace(FACE_TOP)->getLODRoot();
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m_neighborLeft = m_planet->getFace(FACE_FRONT)->getLODRoot();
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m_neighborRight = m_planet->getFace(FACE_BACK)->getLODRoot();
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m_neighborBottom = m_planet->getFace(FACE_BOTTOM)->getLODRoot();
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break;
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// Top face
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case FACE_TOP:
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m_neighborTop = m_planet->getFace(FACE_BACK)->getLODRoot();
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m_neighborLeft = m_planet->getFace(FACE_LEFT)->getLODRoot();
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m_neighborRight = m_planet->getFace(FACE_RIGHT)->getLODRoot();
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m_neighborBottom = m_planet->getFace(FACE_FRONT)->getLODRoot();
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break;
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// Bottom face
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case FACE_BOTTOM:
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m_neighborTop = m_planet->getFace(FACE_FRONT)->getLODRoot();
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m_neighborLeft = m_planet->getFace(FACE_LEFT)->getLODRoot();
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m_neighborRight = m_planet->getFace(FACE_RIGHT)->getLODRoot();
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m_neighborBottom = m_planet->getFace(FACE_BACK)->getLODRoot();
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break;
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}
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return;
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}
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if (m_parent == nullptr) return;
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switch (m_index)
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{
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// Top left corner
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case TOP_LEFT:
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if (m_parent->m_neighborTop != nullptr)
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m_neighborTop = m_parent->m_neighborTop->m_children[BOTTOM_LEFT];
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if (m_parent->m_children[TOP_RIGHT] != nullptr)
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m_neighborRight = m_parent->m_children[TOP_RIGHT];
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if (m_parent->m_children[BOTTOM_LEFT] != nullptr)
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m_neighborBottom = m_parent->m_children[BOTTOM_LEFT];
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if (m_parent->m_neighborLeft != nullptr)
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m_neighborLeft = m_parent->m_neighborLeft->m_children[TOP_RIGHT];
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break;
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// Top right corner
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case TOP_RIGHT:
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if (m_parent->m_neighborTop != nullptr)
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m_neighborTop = m_parent->m_neighborTop->m_children[BOTTOM_RIGHT];
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if (m_parent->m_neighborRight != nullptr)
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m_neighborRight = m_parent->m_neighborRight->m_children[TOP_LEFT];
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if (m_parent->m_children[BOTTOM_RIGHT] != nullptr)
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m_neighborBottom = m_parent->m_children[BOTTOM_RIGHT];
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if (m_parent->m_children[TOP_LEFT] != nullptr)
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m_neighborLeft = m_parent->m_children[TOP_LEFT];
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break;
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// Bottom right corner
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case BOTTOM_RIGHT:
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if (m_parent->m_children[TOP_RIGHT] != nullptr)
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m_neighborTop = m_parent->m_children[TOP_RIGHT];
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if (m_parent->m_neighborRight != nullptr)
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m_neighborRight = m_parent->m_neighborRight->m_children[BOTTOM_LEFT];
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if (m_parent->m_neighborBottom != nullptr)
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m_neighborBottom = m_parent->m_neighborBottom->m_children[TOP_RIGHT];
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if (m_parent->m_children[BOTTOM_LEFT] != nullptr)
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m_neighborLeft = m_parent->m_children[BOTTOM_LEFT];
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break;
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// Bottom left corner
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case BOTTOM_LEFT:
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if (m_parent->m_children[TOP_RIGHT] != nullptr)
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m_neighborTop = m_parent->m_children[TOP_RIGHT];
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if (m_parent->m_children[BOTTOM_RIGHT] != nullptr)
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m_neighborRight = m_parent->m_children[BOTTOM_RIGHT];
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if (m_parent->m_neighborBottom != nullptr)
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m_neighborBottom = m_parent->m_neighborBottom->m_children[TOP_RIGHT];
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if (m_parent->m_neighborLeft != nullptr)
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m_neighborLeft = m_parent->m_neighborLeft->m_children[BOTTOM_RIGHT];
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break;
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}
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}
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PlanetFace::PlanetFace(Planet* planet, const unsigned int face) :
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m_planet(planet), m_face(face)
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{
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m_normal = FACE_NORMALS[m_face];
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m_lod = new PlanetFaceNode(planet, this, m_normal * (m_planet->getRadius() / 2.0f), face, 0);
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}
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PlanetFace::~PlanetFace()
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{
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delete m_lod;
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}
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void PlanetFace::draw(Camera* camera, Shader* shader)
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{
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m_lod->draw(camera, shader);
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}
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void PlanetFace::tick(Camera* camera, GLfloat dtime)
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{
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m_lod->tick(camera, dtime);
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}
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