move chunk loading into world class

1 files changed, 98 insertions, 0 deletions

diff --git a/src/world.cpp b/src/world.cpp
new file mode 100644
index 0000000..485615d
--- /dev/null
+++ b/src/world.cpp
@@ -0,0 +1,98 @@
+#include "world.hpp"
+
+namespace app {
+
+World::World(xe::GameObject& viewer, int renderDistance, int worldSeed) 
+  : viewer{viewer}, 
+    renderDistance{renderDistance},
+    worldSeed{worldSeed},
+    chunkRenderer{Chunk::getTextures()} {
+  reloadChunks(renderDistance);
+}
+
+World::~World() {}
+
+void World::reloadChunks() {
+  int currentViewX = static_cast<int>(floor(viewer.transform.translation.x / Chunk::CHUNK_SIZE.x));
+  int currentViewZ = static_cast<int>(floor(viewer.transform.translation.z / Chunk::CHUNK_SIZE.z));
+  if(currentViewX != viewX || currentViewZ != viewZ) {
+    viewX = currentViewX;
+    viewZ = currentViewZ;
+    unloadOldChunks();
+    loadNewChunks();
+  }
+  updateChunkMeshs();
+}
+
+void World::reloadChunks(int newRenderDistance) {
+  renderDistance = newRenderDistance;
+  viewX = static_cast<int>(floor(viewer.transform.translation.x / Chunk::CHUNK_SIZE.x));
+  viewZ = static_cast<int>(floor(viewer.transform.translation.z / Chunk::CHUNK_SIZE.z));
+  resetChunks();
+  loadNewChunks();
+  updateChunkMeshs();
+}
+
+void World::resetChunks() {
+  unloadOldChunks();
+  loadedChunks.clear();
+  int width = 2*renderDistance+1;
+  for(int i = 0; i < width*width; i++) {
+    auto gameObject = xe::GameObject::createGameObject();
+    loadedChunks.push_back(std::move(gameObject));
+  }
+}
+
+void World::unloadOldChunks() {
+  int minX = viewX - renderDistance;
+  int minZ = viewZ - renderDistance;
+  int maxX = viewX + renderDistance;
+  int maxZ = viewZ + renderDistance;
+  for(auto &object : loadedChunks) {
+    int gridX = static_cast<int>(floor(object.transform.translation.x / Chunk::CHUNK_SIZE.x));
+    int gridZ = static_cast<int>(floor(object.transform.translation.z / Chunk::CHUNK_SIZE.z));
+    if(gridX < minX || gridZ < minZ || gridX > maxX || gridZ > maxZ){
+        Chunk::deleteChunk(gridX, gridZ);
+        object.model = nullptr;
+    }
+  }
+}
+
+void World::loadNewChunks() {
+  int width = 2*renderDistance+1;
+  int minX = viewX - renderDistance;
+  int minZ = viewZ - renderDistance;
+  int maxX = viewX + renderDistance;
+  int maxZ = viewZ + renderDistance;
+  int i = 0;
+  for(auto &object : loadedChunks) {
+    int gridX = minX + i % width;
+    int gridZ = minZ + i / width;
+    Chunk* chunk = Chunk::getChunk(gridX, gridZ);
+    if(chunk == nullptr) {
+      chunk = Chunk::newChunk(gridX, gridZ, worldSeed);
+      Chunk::generateAsync(chunk);
+    }
+    object.transform.translation = glm::vec3(gridX * Chunk::CHUNK_SIZE.x, 0, gridZ * Chunk::CHUNK_SIZE.z);
+    i++;
+  }
+}
+
+void World::updateChunkMeshs() {
+  for(auto &object : loadedChunks) {
+    int gridX = static_cast<int>(floor(object.transform.translation.x / Chunk::CHUNK_SIZE.x));
+    int gridZ = static_cast<int>(floor(object.transform.translation.z / Chunk::CHUNK_SIZE.z));
+    Chunk* chunk = Chunk::getChunk(gridX, gridZ);
+    if(chunk == nullptr) continue;
+    if(chunk->getMesh() == nullptr)
+      Chunk::createMeshAsync(chunk);
+    object.model = chunk->getMesh();
+  }
+}
+
+void World::render(xe::Camera& camera) {
+  camera.setViewYXZ(viewer.transform.translation, viewer.transform.rotation);
+  chunkRenderer.render(loadedChunks, camera);
+}
+
+}
\ No newline at end of file