implement structures rotation

res/generators/default.lua

@@ -77,7 +77,8 @@ function place_structures(x, z, w, d, seed, hmap)
         if py <= sea_level then
             goto continue
         end
-        table.insert(placements, {math.floor(math.random() * 3), {px-8, py, pz-8}})
+        table.insert(placements, 
+            {math.floor(math.random() * 3), {px-8, py, pz-8}, math.floor(math.random()*4)})
         ::continue::
     end
 
@@ -85,7 +86,7 @@ function place_structures(x, z, w, d, seed, hmap)
         local px = math.random() * w
         local pz = math.random() * d
         local py = hmap:at(px, pz) * 256
-        table.insert(placements, {3, {px-8, py, pz-8}})
+        table.insert(placements, {3, {px-8, py, pz-8}, 0})
     end
     return placements
 end

src/logic/scripting/scripting_world_generation.cpp

@@ -127,9 +127,13 @@ public:
                     glm::ivec3 pos = lua::tovec3(L, -1);
                     lua::pop(L);
 
+                    lua::rawgeti(L, 3);
+                    int rotation = lua::tointeger(L, -1) & 0b11;
                     lua::pop(L);
 
-                    placements.emplace_back(structIndex, pos);
+                    lua::pop(L);
+
+                    placements.emplace_back(structIndex, pos, rotation);
                 }
                 lua::pop(L);
             }

src/world/generator/StructurePlacement.hpp

@@ -1,12 +1,16 @@
 #pragma once
 
+#include <stdint.h>
 #include <glm/glm.hpp>
 
 struct StructurePlacement {
     int structure;
-
     glm::ivec3 position;
+    uint8_t rotation;
 
-    StructurePlacement(int structure, glm::ivec3 position)
+    StructurePlacement(int structure, glm::ivec3 position, uint8_t rotation)
-        : structure(structure), position(std::move(position)) {}
+        : structure(structure),
+          position(std::move(position)),
+          rotation(rotation) {
+    }
 };

src/world/generator/VoxelStructure.cpp

@@ -92,3 +92,35 @@ void VoxelStructure::prepare(const Content& content) {
         voxelsRuntime[i].state = voxels[i].state;
     }
 }
+
+std::unique_ptr<VoxelStructure> VoxelStructure::rotated(const Content& content) const {
+    std::vector<voxel> newVoxels(voxels.size());
+
+    for (int y = 0; y < size.y; y++) {
+        for (int z = 0; z < size.z; z++) {
+            for (int x = 0; x < size.x; x++) {
+                auto& voxel = newVoxels[vox_index(x, y, z, size.x, size.z)];
+                voxel = voxels[vox_index(size.z-z-1, y, x, size.z, size.x)];
+                // swap X and Z segment bits
+                voxel.state.segment = ((voxel.state.segment & 0b001) << 2)
+                                    | (voxel.state.segment & 0b010)
+                                    | ((voxel.state.segment & 0b100) >> 2);
+                auto& def = content.blocks.require(blockNames[voxel.id]);
+                if (def.rotations.name == BlockRotProfile::PANE_NAME ||
+                      def.rotations.name == BlockRotProfile::PIPE_NAME){
+                    if (voxel.state.rotation < 4) {
+                        voxel.state.rotation = (voxel.state.rotation + 3) & 0b11;
+                    }
+                }
+            }
+        }
+    }
+    auto newStructure = std::make_unique<VoxelStructure>(
+        // swap X and Z on 90 deg. rotation
+        glm::ivec3(size.z, size.y, size.x),
+        std::move(newVoxels),
+        blockNames
+    );
+    newStructure->prepare(content);
+    return newStructure;
+}

src/world/generator/VoxelStructure.hpp

@@ -40,6 +40,9 @@ public:
     /// @param content world content
     void prepare(const Content& content);
 
+    /// @brief Create structure copy rotated 90 deg. clockwise
+    std::unique_ptr<VoxelStructure> rotated(const Content& content) const;
+
     static std::unique_ptr<VoxelStructure> create(
         Level* level, const glm::ivec3& a, const glm::ivec3& b, bool entities);
 
@@ -47,6 +50,7 @@ public:
         return size;
     }
 
+    /// @return Voxels with indices valid to current world content
     const std::vector<voxel>& getRuntimeVoxels() {
         assert(!voxelsRuntime.empty());
         return voxelsRuntime;

src/world/generator/WorldGenerator.cpp

@@ -1,7 +1,6 @@
 #include "WorldGenerator.hpp"
 
 #include <cstring>
-#include <iostream>
 
 #include "maths/util.hpp"
 #include "content/Content.hpp"
@@ -50,9 +49,16 @@ WorldGenerator::WorldGenerator(
         generateStructures(requirePrototype(x, z), x, z);
     });
 
-    structures = def.script->loadStructures();
+    auto rawStructures = def.script->loadStructures();
-    for (auto& structure : structures) {
+    structures.resize(rawStructures.size());
-        structure->prepare(*content);
+
+    for (int i = 0; i < rawStructures.size(); i++) {
+        structures[i][0] = std::move(rawStructures[i]);
+        structures[i][0]->prepare(*content);
+        // pre-calculate rotated structure variants
+        for (int j = 1; j < 4; j++) {
+            structures[i][j] = structures[i][j-1]->rotated(*content);
+        }
     }
 }
 
@@ -150,7 +156,7 @@ void WorldGenerator::generateStructures(
             logger.error() << "invalid structure index " << placement.structure;
             continue;
         }
-        auto& structure = *structures[placement.structure];
+        auto& structure = *structures[placement.structure][placement.rotation];
         auto position = glm::ivec3(chunkX * CHUNK_W, 0, chunkZ * CHUNK_D)+offset;
         auto size = structure.getSize() + glm::ivec3(0, CHUNK_H, 0);
         AABB aabb(position, position + size);
@@ -167,7 +173,8 @@ void WorldGenerator::generateStructures(
                     otherPrototype.structures.emplace_back(
                         placement.structure, 
                         placement.position - 
-                            glm::ivec3(lcx * CHUNK_W, 0, lcz * CHUNK_D)
+                            glm::ivec3(lcx * CHUNK_W, 0, lcz * CHUNK_D),
+                        placement.rotation
                     );
                 }
             }
@@ -258,7 +265,7 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ) {
             logger.error() << "invalid structure index " << placement.structure;
             continue;
         }
-        auto& structure = *structures[placement.structure];
+        auto& structure = *structures[placement.structure][placement.rotation];
         auto& structVoxels = structure.getRuntimeVoxels();
         const auto& offset = placement.position;
         const auto& size = structure.getSize();

src/world/generator/WorldGenerator.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <array>
 #include <string>
 #include <memory>
 #include <vector>
@@ -46,7 +47,7 @@ class WorldGenerator {
     /// @brief Chunk prototypes loading surround map
     SurroundMap surroundMap;
 
-    std::vector<std::shared_ptr<VoxelStructure>> structures;
+    std::vector<std::array<std::shared_ptr<VoxelStructure>, 4>> structures;
 
     /// @brief Generate chunk prototype (see ChunkPrototype)
     /// @param x chunk position X divided by CHUNK_W