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Reduce server CPU consumed by occlusion culling. (#13260)
Cache blocks already occluded at a specific distance. The RemoteClient typically visits the same distance multiple time - especially at larger distances, so this saves significant CPU from recalculating the occlusion state of blocks.
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9ef3c8ce38
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@ -328,8 +328,15 @@ void RemoteClient::GetNextBlocks (
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continue;
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}
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/*
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Check occlusion cache first.
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*/
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if (m_blocks_occ.find(p) != m_blocks_occ.end())
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continue;
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if (m_occ_cull && !block_not_found &&
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env->getMap().isBlockOccluded(block, cam_pos_nodes)) {
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m_blocks_occ.insert(p);
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continue;
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}
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}
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@ -395,8 +402,11 @@ queue_full_break:
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}
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}
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if (new_nearest_unsent_d != -1)
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if (new_nearest_unsent_d != -1 && m_nearest_unsent_d != new_nearest_unsent_d) {
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m_nearest_unsent_d = new_nearest_unsent_d;
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// if the distance has changed, clear the occlusion cache
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m_blocks_occ.clear();
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}
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}
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void RemoteClient::GotBlock(v3s16 p)
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@ -33,6 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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#include <list>
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#include <vector>
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#include <set>
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#include <unordered_set>
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#include <memory>
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#include <mutex>
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@ -379,7 +380,15 @@ private:
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List of block positions.
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No MapBlock* is stored here because the blocks can get deleted.
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*/
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std::set<v3s16> m_blocks_sent;
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std::unordered_set<v3s16> m_blocks_sent;
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/*
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Cache of blocks that have been occlusion culled at the current distance.
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As GetNextBlocks traverses the same distance multiple times, this saves
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significant CPU time.
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*/
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std::unordered_set<v3s16> m_blocks_occ;
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s16 m_nearest_unsent_d = 0;
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v3s16 m_last_center;
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v3f m_last_camera_dir;
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@ -399,7 +408,7 @@ private:
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Block is removed when GOTBLOCKS is received.
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Value is time from sending. (not used at the moment)
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*/
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std::map<v3s16, float> m_blocks_sending;
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std::unordered_map<v3s16, float> m_blocks_sending;
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/*
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Blocks that have been modified since blocks were
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@ -409,7 +418,7 @@ private:
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List of block positions.
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*/
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std::set<v3s16> m_blocks_modified;
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std::unordered_set<v3s16> m_blocks_modified;
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/*
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Count of excess GotBlocks().
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