factor out resource loading into header

linux/include/polyvox_filament/resource_loader.hpp

@@ -0,0 +1,63 @@
+#ifndef POLYVOX_FILAMENT_LINUX_RESOURCE_LOADER_H
+#define POLYVOX_FILAMENT_LINUX_RESOURCE_LOADER_H
+
+#include <math.h>
+#include <iostream>
+#include <fstream>
+#include <cstring>
+#include <vector>
+#include <string> 
+#include <map>
+#include <unistd.h>
+
+#include "ResourceBuffer.hpp"
+
+using namespace std;
+
+static map<uint32_t, void*> _file_assets;
+static uint32_t _i = 0;
+
+ResourceBuffer loadResource(const char* name) {
+
+    char cwd[PATH_MAX];
+    if (getcwd(cwd, sizeof(cwd)) != NULL) {
+       std::cout << "Current working dir: " << cwd  << std::endl;
+    }
+
+    string name_str(name);
+    auto id = _i++;
+    
+    if (name_str.rfind("file://", 0) == 0) {
+      name_str = name_str.substr(7);
+    }
+
+    name_str = string(cwd) + string("/") + name_str;
+
+    std::cout << "Loading resource at " << name_str.c_str() << std::endl;
+
+    streampos length;
+    ifstream is(name_str, ios::binary);
+    if(!is) {
+      std::cout << "Failed to find resource at file path " << name_str.c_str() << std::endl;
+      return ResourceBuffer(nullptr, 0, -1);
+    }
+    is.seekg (0, ios::end);
+    length = is.tellg();
+    char * buffer;
+    buffer = new char [length];
+    is.seekg (0, ios::beg);
+    is.read (buffer, length);
+    is.close();      
+    _file_assets[id] = buffer;
+    return ResourceBuffer(buffer, length, id);
+}
+
+void freeResource(uint32_t id) {
+  std::cout << "Freeing resource " << id << std::endl;
+  auto it = _file_assets.find(id);
+  if (it != _file_assets.end()) {
+    free(it->second);
+  }
+}
+
+#endif