added asset loading class, zoom factor, vbo switch, shader version

engine/image.cpp

@@ -1,12 +1,20 @@
 #include "pch.h"
 #include "image.h"
+#include "asset.h"
 
 #include <stb/stb_image.h>
 
 bool Image::load(std::string filename)
 {
     //stbi_set_flip_vertically_on_load(true);
-    uint8_t* buffer = stbi_load(filename.c_str(), &width, &height, nullptr, 4);
+    Asset file;
+    if (!(file.open(filename.c_str()) && file.read_all()))
+    {
+        file.close();
+        return false;
+    }
+    uint8_t* buffer = stbi_load_from_memory(file.m_data, file.m_len, &width, &height, nullptr, 4);
+    file.close();
     comp = 4;
     m_data = std::unique_ptr<uint8_t[]>(buffer);
     return true;