Minor refactor

src/frontend/BlocksPreview.cpp

@@ -18,11 +18,10 @@ BlocksPreview::BlocksPreview(Shader* shader,
                              Atlas* atlas, 
                              const ContentGfxCache* cache)
     : shader(shader), atlas(atlas), cache(cache) {
-    batch = new Batch3D(1024);
+    batch = std::make_unique<Batch3D>(1024);
 }
 
 BlocksPreview::~BlocksPreview() {
-    delete batch;
 }
 
 void BlocksPreview::begin(const Viewport* viewport) {

src/frontend/BlocksPreview.h

@@ -3,6 +3,7 @@
 
 #include "../typedefs.h"
 #include <glm/glm.hpp>
+#include <memory>
 
 class Viewport;
 class Shader;
@@ -14,7 +15,7 @@ class ContentGfxCache;
 class BlocksPreview {
     Shader* shader;
     Atlas* atlas;
-    Batch3D* batch;
+    std::unique_ptr<Batch3D> batch;
     const ContentGfxCache* const cache;
     const Viewport* viewport;
 public: