save a little memory

[blank.git] / src / chunk.cpp

diff --git a/src/chunk.cpp b/src/chunk.cpp
index 04c64f26738170a98b64345ddfc9712463ce70d5..bed947e3d5fdfff7182056313a30667ad9996edb 100644 (file)
--- a/src/chunk.cpp
+++ b/src/chunk.cpp
@@ -6,6 +6,12 @@
 #include <glm/gtx/transform.hpp>
 
 
+namespace {
+
+blank::Model::Buffer buf;
+
+}
+
 namespace blank {
 
 Chunk::Chunk(const BlockTypeRegistry &types)
@@ -117,7 +123,6 @@ void Chunk::CheckUpdate() {
        if (dirty) {
                Update();
        }
-       model.CheckUpdate();
 }
 
 void Chunk::Update() {
@@ -127,17 +132,17 @@ void Chunk::Update() {
                vtx_count += shape->VertexCount();
                idx_count += shape->VertexIndexCount();
        }
-       model.Clear();
-       model.Reserve(vtx_count, idx_count);
+       buf.Clear();
+       buf.Reserve(vtx_count, idx_count);
 
        Model::Index vtx_counter = 0;
        for (size_t i = 0; i < Size(); ++i) {
                const BlockType &type = Type(blocks[i]);
-               type.FillModel(model, ToCoords(i), vtx_counter);
+               type.FillModel(buf, ToCoords(i), vtx_counter);
                vtx_counter += type.shape->VertexCount();
        }
 
-       model.Invalidate();
+       model.Update(buf);
        dirty = false;
 }
 
@@ -161,9 +166,9 @@ struct ChunkLess {
        explicit ChunkLess(const Chunk::Pos &base)
        : base(base) { }
 
-       bool operator ()(const Chunk &a, const Chunk &b) const {
-               Chunk::Pos da(base - a.Position());
-               Chunk::Pos db(base - b.Position());
+       bool operator ()(const Chunk::Pos &a, const Chunk::Pos &b) const {
+               Chunk::Pos da(base - a);
+               Chunk::Pos db(base - b);
                return
                        da.x * da.x + da.y * da.y + da.z * da.z <
                        db.x * db.x + db.y * db.y + db.z * db.z;
@@ -187,8 +192,7 @@ void ChunkLoader::Generate(const Chunk::Pos &from, const Chunk::Pos &to) {
                                        loaded.back().Position(pos);
                                        gen(loaded.back());
                                } else {
-                                       to_generate.emplace_back(reg);
-                                       to_generate.back().Position(pos);
+                                       to_generate.emplace_back(pos);
                                }
                        }
                }
@@ -205,19 +209,17 @@ Chunk *ChunkLoader::Loaded(const Chunk::Pos &pos) {
        return nullptr;
 }
 
-Chunk *ChunkLoader::Queued(const Chunk::Pos &pos) {
-       for (Chunk &chunk : to_generate) {
-               if (chunk.Position() == pos) {
-                       return &chunk;
+bool ChunkLoader::Queued(const Chunk::Pos &pos) {
+       for (const Chunk::Pos &chunk : to_generate) {
+               if (chunk == pos) {
+                       return true;
                }
        }
        return nullptr;
 }
 
-Chunk *ChunkLoader::Known(const Chunk::Pos &pos) {
-       Chunk *chunk = Loaded(pos);
-       if (chunk) return chunk;
-
+bool ChunkLoader::Known(const Chunk::Pos &pos) {
+       if (Loaded(pos)) return true;
        return Queued(pos);
 }
 
@@ -227,10 +229,11 @@ Chunk &ChunkLoader::ForceLoad(const Chunk::Pos &pos) {
                return *chunk;
        }
 
-       chunk = Queued(pos);
-       if (chunk) {
-               gen(*chunk);
-               return *chunk;
+       for (auto iter(to_generate.begin()), end(to_generate.end()); iter != end; ++iter) {
+               if (*iter == pos) {
+                       to_generate.erase(iter);
+                       break;
+               }
        }
 
        loaded.emplace_back(reg);
@@ -259,9 +262,9 @@ void ChunkLoader::Rebase(const Chunk::Pos &new_base) {
        }
        // abort far away queued chunks
        for (auto iter(to_generate.begin()), end(to_generate.end()); iter != end;) {
-               if (std::abs(base.x - iter->Position().x) > unload_dist
-                               || std::abs(base.y - iter->Position().y) > unload_dist
-                               || std::abs(base.z - iter->Position().z) > unload_dist) {
+               if (std::abs(base.x - iter->x) > unload_dist
+                               || std::abs(base.y - iter->y) > unload_dist
+                               || std::abs(base.z - iter->z) > unload_dist) {
                        iter = to_generate.erase(iter);
                } else {
                        ++iter;
@@ -273,12 +276,32 @@ void ChunkLoader::Rebase(const Chunk::Pos &new_base) {
 }
 
 void ChunkLoader::Update() {
+       bool reused = false;
        if (!to_generate.empty()) {
-               gen(to_generate.front());
-               loaded.splice(loaded.end(), to_generate, to_generate.begin());
+               Chunk::Pos pos(to_generate.front());
+
+               for (auto iter(to_free.begin()), end(to_free.end()); iter != end; ++iter) {
+                       if (iter->Position() == pos) {
+                               loaded.splice(loaded.end(), to_free, iter);
+                               reused = true;
+                               break;
+                       }
+               }
+
+               if (!reused) {
+                       if (to_free.empty()) {
+                               loaded.emplace_back(reg);
+                       } else {
+                               loaded.splice(loaded.end(), to_free, to_free.begin());
+                               reused = true;
+                       }
+                       loaded.back().Position(pos);
+                       gen(loaded.back());
+               }
+               to_generate.pop_front();
        }
 
-       if (!to_free.empty()) {
+       if (!reused && !to_free.empty()) {
                to_free.pop_front();
        }
 }