Use basic_viewport8b if antialiasing is not enabled.

1 files changed, 1 insertions, 0 deletions

diff --git a/viewport.h b/viewport.h
index b4e4e56..74bdfcd 100644
--- a/viewport.h
+++ b/viewport.h
@@ -44,6 +44,7 @@ template<typename T>
 class viewport {
 public:
     virtual bitmap<T> render(const hitlist<T> &world, vec3d viewpoint, uint16_t image_width, uint16_t image_height) = 0;
+    virtual ~viewport() = default;
 };
 
 using viewport8b = viewport<uint8_t>;