Introduced Content, ContentIndices, no more integer ids hardcoded, common refactor

src/content/Content.cpp

@@ -0,0 +1,50 @@
+#include "Content.h"
+
+#include <stdexcept>
+
+#include "../voxels/Block.h"
+
+using std::vector;
+using std::string;
+using std::unordered_map;
+
+void ContentBuilder::add(Block* def) {
+    if (blockDefs.find(def->name) != blockDefs.end()) {
+        throw std::runtime_error("block name duplicate: "+def->name);
+    }
+    blockDefs[def->name] = def;
+    blockIds.push_back(def->name);
+}
+
+Content* ContentBuilder::build() {
+    vector<Block*> blockDefsIndices;
+    for (const string& name : blockIds) {
+        Block* def = blockDefs[name];
+        def->id = blockDefsIndices.size();
+        blockDefsIndices.push_back(def);
+    }
+    ContentIndices* indices = new ContentIndices(blockDefsIndices);
+    return new Content(indices, blockDefs);
+}
+
+ContentIndices::ContentIndices(vector<Block*> blockDefs)
+               : blockDefs(blockDefs) {
+}
+
+Content::Content(ContentIndices* indices,
+                 unordered_map<string, Block*> blockDefs)
+        : blockDefs(blockDefs),
+          indices(indices) {
+}
+
+Content::~Content() {
+    delete indices;
+}
+
+Block* Content::require(std::string id) const {
+    auto found = blockDefs.find(id);
+    if (found == blockDefs.end()) {
+        throw std::runtime_error("missing block "+id);
+    }
+    return found->second;
+}