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#include "Lighting.hpp"
namespace MC::World::Generation {
void Lighting::add_chunk(Chunk& chunk) {
for (U8 x = 0; x < Chunk::Width; x++) {
for (U8 z = 0; z < Chunk::Width; z++) {
U8 current_light_exposure = SunBrightness;
for (U8 y = Chunk::Height - 1; y != 0; y--) {
auto& block = chunk.at(x, y, z);
if (!block.type.is_translucent()) break;
current_light_exposure = (Real)current_light_exposure * (1 - block.type.opacity());
add_block(chunk, {x, y, z}, current_light_exposure);
}
}
}
}
void Lighting::add_block(Chunk& chunk, Position::BlockLocal position, U8 light) {
auto& block = chunk.at(position);
block.light = light;
enqueue(chunk.index(), position, light);
}
void Lighting::illuminate(Chunk& chunk) {
while (!m_queue.empty()) {
auto op = m_queue.front();
m_queue.pop();
process(chunk, op);
}
}
void Lighting::enqueue(ChunkIndex chunk, Position::BlockLocal position, U8 origin) {
m_queue.push({chunk, position, origin});
}
void Lighting::process(Chunk& chunk, Operation op) {
for (auto direction : Position::axis_directions) {
auto neighbor_pos = op.position.offset(direction);
if (!neighbor_pos.fits_within_chunk()) continue;
auto& neighbor = chunk.at(neighbor_pos);
if (!neighbor.type.is_translucent()) continue;
U8 falloff = (neighbor.type.opacity() + 1) * DefaultFalloff;
U8 target = std::max(op.origin - falloff, 0);
if (neighbor.light < target) {
neighbor.light = target;
enqueue(op.chunk, neighbor_pos, target);
}
}
}
}
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