Base content package + ContentLoader

src/content/ContentLoader.cpp

@@ -0,0 +1,124 @@
+#include "ContentLoader.h"
+
+#include <iostream>
+#include <string>
+#include <memory>
+
+#include "Content.h"
+#include "../voxels/Block.h"
+#include "../files/files.h"
+#include "../coders/json.h"
+#include "../typedefs.h"
+
+#include <glm/glm.hpp>
+
+using glm::vec3;
+using std::cout;
+using std::cerr;
+using std::endl;
+using std::string;
+using std::unique_ptr;
+using std::filesystem::path;
+
+ContentLoader::ContentLoader(path folder) : folder(folder) {}
+
+// TODO: add basic validation and logging
+Block* ContentLoader::loadBlock(string name, path file) {
+    string source = files::read_string(file);
+    unique_ptr<json::JObject> root = nullptr;
+    try {
+        root.reset(json::parse(file.string(), source));
+    } catch (const parsing_error& error) {
+        cerr << error.errorLog() << endl;
+        throw std::runtime_error("could not load block def");
+    }
+    unique_ptr<Block> def(new Block(name));
+
+    // block texturing
+    if (root->has("texture")) {
+        string texture;
+        root->str("texture", texture);
+        for (uint i = 0; i < 6; i++)
+            def->textureFaces[i] = texture;
+    } else if (root->has("texture-faces")) {
+        json::JArray* texarr = root->arr("texture-faces");
+        for (uint i = 0; i < 6; i++) {
+            def->textureFaces[i] = texarr->str(i);
+        }
+    }
+
+    // block model
+    string model = "block";
+    root->str("model", model);
+    if (model == "block") def->model = BlockModel::block;
+    else if (model == "aabb") def->model = BlockModel::aabb;
+    else if (model == "X") def->model = BlockModel::xsprite;
+    else if (model == "none") def->model = BlockModel::none;
+    else {
+        cerr << "unknown model " << model << endl;
+        def->model = BlockModel::none;
+    }
+    
+    // block hitbox AABB [x, y, z, width, height, depth]
+    json::JArray* hitboxobj = root->arr("hitbox");
+    if (hitboxobj) {
+        AABB& aabb = def->hitbox;
+        aabb.a = vec3(hitboxobj->num(0), hitboxobj->num(1), hitboxobj->num(2));
+        aabb.b = vec3(hitboxobj->num(3), hitboxobj->num(4), hitboxobj->num(5));
+        aabb.b += aabb.a;
+    }
+
+    // block light emission [r, g, b] where r,g,b in range [0..15]
+    json::JArray* emissionobj = root->arr("emission");
+    if (emissionobj) {
+        def->emission[0] = emissionobj->num(0);
+        def->emission[1] = emissionobj->num(1);
+        def->emission[2] = emissionobj->num(2);
+    }
+
+    // primitive properties
+    root->flag("obstacle", def->obstacle);
+    root->flag("replaceable", def->replaceable);
+    root->flag("light-passing", def->lightPassing);
+    root->flag("breakable", def->breakable);
+    root->flag("selectable", def->selectable);
+    root->flag("rotatable", def->rotatable);
+    root->flag("sky-light-passing", def->skyLightPassing);
+    root->num("draw-group", def->drawGroup);
+
+    return def.release();
+}
+
+void ContentLoader::load(ContentBuilder* builder) {
+    cout << "-- loading content " << folder << endl;
+
+    path file = folder / path("package.json");
+    string source = files::read_string(file);
+
+    unique_ptr<json::JObject> root = nullptr;
+    try {
+        root.reset(json::parse(file.filename().string(), source));
+    } catch (const parsing_error& error) {
+        cerr << error.errorLog() << endl;
+        throw std::runtime_error("could not load content package");
+    }
+
+    string id;
+    string version;
+    root->str("id", id);
+    root->str("version", version);
+
+    cout << "    id: " << id << endl;
+    cout << "    version: " << version << endl;
+
+    json::JArray* blocksarr = root->arr("blocks");
+    if (blocksarr) {
+        cout << "    blocks: " << blocksarr->size() << endl;
+        for (uint i = 0; i < blocksarr->size(); i++) {
+            string name = blocksarr->str(i); 
+            cout << "    loading block " << id << ":" << name << endl;
+            path blockfile = folder/path("blocks/"+name+".json");
+            builder->add(loadBlock(id+":"+name, blockfile));
+        }
+    }
+}