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#include "World.hpp"
#include "Generation/ChunkMeshing.hpp"
#include "Generation/Lighting.hpp"
#include "../Time.hpp"
namespace MC::World {
std::vector<ChunkRegistry::Data*> World::get_visible_chunks(Position::World position) {
process_chunk_updates();
if (should_reassess_priorities(position)) {
reassess_priorities(position);
}
auto visible_chunks = get_visible_chunk_indices(position);
std::vector<ChunkRegistry::Data*> chunks{};
chunks.reserve(visible_chunks.size());
for (auto index : visible_chunks) {
auto& data = m_registry.get(index);
if (data.get_status() == ChunkRegistry::Status::Empty) {
request_generation(index, calculate_priority(index, position, RequestType::Initial));
data.status = ChunkRegistry::Status::WaitingForGeneration;
continue;
}
if (data.get_status() == ChunkRegistry::Status::NeedsReification || data.get_status() == ChunkRegistry::Status::Damaged) {
auto do_all_exist = Generation::find_chunk_neighbors(index, m_registry).all_exist();
if (m_reification_queue.size() <= 50 && do_all_exist) {
auto request_type = data.get_status() == ChunkRegistry::Status::Damaged ? RequestType::Update : RequestType::Initial;
request_reification(index, calculate_priority(index, position, request_type));
data.status = ChunkRegistry::Status::WaitingForReification;
}
}
// TODO: Use a better indicator than `land_mesh.has_value()`.
if (data.land_mesh.has_value()) chunks.push_back(&data);
}
return chunks;
}
std::vector<ChunkIndex> World::get_visible_chunk_indices(const Position::World position) const {
I32 center_x = std::round(position.x() / Chunk::Width);
I32 center_y = std::round(position.z() / Chunk::Width);
std::vector<ChunkIndex> indices{};
indices.reserve(m_view_distance_radius * m_view_distance_radius * 4);
auto radius = m_view_distance_radius;
for (I32 x = -radius; x <= radius; x++) {
I32 height = std::round(std::sqrt(radius * radius - x * x) + 0.5);
for (I32 y = -height; y <= height; y++) {
// Needed so that this function and is_chunk_in_radius forcibly agree.
if (!is_chunk_in_radius(position, {x + center_x, y + center_y})) continue;
indices.emplace_back(x + center_x, y + center_y);
}
}
auto cmp = [=](const ChunkIndex& a, const ChunkIndex& b) -> bool {
return position.distance(a.middle()) > position.distance(b.middle());
};
std::sort(indices.begin(), indices.end(), cmp);
return indices;
}
void World::process_chunk_updates() {
auto generation_results = m_generation_queue.done();
for (auto& [id, res] : generation_results) {
m_registry.get(id) = {id, ChunkRegistry::Status::NeedsReification, {res.chunk}};
log_chunk_time(res.generation_duration);
}
auto reification_results = m_reification_queue.done();
for (auto& [id, res] : reification_results) {
m_registry.get(id) = {
id, ChunkRegistry::Status::Done,
{res.chunk},
res.chunk_mesh.land_mesh,
res.chunk_mesh.water_mesh
};
// TODO: Damage surrounding chunks.
}
}
void World::request_generation(ChunkIndex index, Real priority) {
m_generation_queue.add(index, priority, [=]() -> GenerationResult {
auto start = Time::now();
auto chunk = m_generator.generate(index.x, index.y);
return {chunk, Time::now() - start};
});
}
void World::request_reification(ChunkIndex index, Real priority) {
auto& data = m_registry.get(index);
auto& chunk = data.chunk.value();
auto neighbors = Generation::find_chunk_neighbors(index, m_registry);
auto meshing_context = Generation::ChunkMeshing::create_meshing_context(data.chunk.value(), neighbors);
m_reification_queue.add(index, priority, [=]() mutable -> ReificationResult {
Generation::Lighting intitial_lighting{};
intitial_lighting.add_chunk(chunk);
intitial_lighting.illuminate(chunk);
auto meshes = Generation::ChunkMeshing::mesh_chunk(chunk, meshing_context);
return {chunk, meshes};
});
}
Bool World::should_reassess_priorities(Position::World player_position) const {
return player_position.distance(m_last_priority_reassession_at) > m_priority_reassession_distance_threshold;
}
void World::reassess_priorities(Position::World player_position) {
m_last_priority_reassession_at = player_position;
// TODO: How do we know a chunk has been requested as an update?
m_generation_queue.reassess([&](ChunkIndex id) -> GenerationQueue::Reassession {
if (!is_chunk_in_radius(player_position, id)) {
m_registry.get(id).status = ChunkRegistry::Status::Empty;
return {GenerationQueue::Reassession::Cancel};
}
return {
GenerationQueue::Reassession::Reassess,
calculate_priority(id, player_position, RequestType::Initial)
};
});
m_reification_queue.reassess([&](ChunkIndex id) -> ReificationQueue::Reassession {
if (!is_chunk_in_radius(player_position, id)) {
m_registry.get(id).status = ChunkRegistry::Status::NeedsReification;
return {ReificationQueue::Reassession::Cancel};
}
return {
ReificationQueue::Reassession::Reassess,
calculate_priority(id, player_position, RequestType::Initial)
};
});
}
Real World::calculate_priority(ChunkIndex chunk, Position::World player_position, RequestType request_type) {
auto chunk_position = chunk.middle();
auto flat_distance = Position::World{player_position.x(), chunk_position.y(), player_position.z()}.distance(chunk_position);
Real request_type_penalty;
switch (request_type) {
case RequestType::Initial: request_type_penalty = 0; break;
case RequestType::Update: request_type_penalty = 500; break;
}
return flat_distance + request_type_penalty;
}
void World::log_chunk_time(U64 chunk_time_ms) {
m_statistics.chunk_time_sample_count++;
m_statistics.average_chunk_time_ms += ((Real)chunk_time_ms - m_statistics.average_chunk_time_ms) / m_statistics.chunk_time_sample_count;
}
Real World::get_average_chunk_time() const {
return m_statistics.average_chunk_time_ms;
}
Bool World::is_chunk_in_radius(Position::World position, ChunkIndex chunk) const {
Real max_distance = (m_view_distance_radius + 2) * Chunk::Width; // TODO: Tune this so that m_view_distance_radius represents the exact radius.
auto chunk_position = chunk.middle();
// TODO: Create a flat() method in Position::World for things like this. See also: priorities.
Position::World flat_position{position.x(), chunk_position.y(), position.z()};
return chunk_position.distance(flat_position) < max_distance;
}
}
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