diff --git a/engine/renderer/include/shadowpass.hpp b/engine/renderer/include/shadowpass.hpp
index e4156ec..c72bda0 100755
--- a/engine/renderer/include/shadowpass.hpp
+++ b/engine/renderer/include/shadowpass.hpp
@@ -17,14 +17,14 @@ struct CameraFrustum;
 
 class ShadowPass {
 public:
-    ShadowPass(GFX* gfx);
+    explicit ShadowPass(GFX* gfx);
     
     void create_scene_resources(Scene& scene);
     
     void render(GFXCommandBuffer* command_buffer, Scene& scene);
     
 private:
-    void render_meshes(GFXCommandBuffer* command_buffer, Scene& scene, const Matrix4x4 light_matrix, const Matrix4x4 model, const prism::float3 light_position, const Light::Type type, const CameraFrustum& frustum, const int base_instance);
+    void render_meshes(GFXCommandBuffer* command_buffer, Scene& scene, Matrix4x4 light_matrix, Matrix4x4 model, prism::float3 light_position, Light::Type type, const CameraFrustum& frustum, int base_instance);
     
     void render_sun(GFXCommandBuffer* command_buffer, Scene& scene, prism::Object light_object, Light& light);
     void render_spot(GFXCommandBuffer* command_buffer, Scene& scene, prism::Object light_object, Light& light);
diff --git a/engine/renderer/include/smaapass.hpp b/engine/renderer/include/smaapass.hpp
index df29d1c..f22608f 100755
--- a/engine/renderer/include/smaapass.hpp
+++ b/engine/renderer/include/smaapass.hpp
@@ -17,7 +17,7 @@ namespace prism {
 
 class SMAAPass {
 public:
-    SMAAPass(GFX* gfx);
+    explicit SMAAPass(GFX* gfx);
     
     void create_render_target_resources(RenderTarget& target);
     
diff --git a/engine/shadercompiler/include/shadercompiler.hpp b/engine/shadercompiler/include/shadercompiler.hpp
index fec5981..e8dea63 100755
--- a/engine/shadercompiler/include/shadercompiler.hpp
+++ b/engine/shadercompiler/include/shadercompiler.hpp
@@ -44,7 +44,6 @@ public:
 class ShaderSource {
 public:
     ShaderSource() : source(std::monostate()) {}
-    ShaderSource(const ShaderSource& rhs) : source (rhs.source) {}
     explicit ShaderSource(const std::string& source_string) : source(source_string) {}
     explicit ShaderSource(const std::vector<uint32_t>& source_bytecode) : source(source_bytecode) {}
     explicit ShaderSource(const prism::path& shader_path) : source(shader_path) {}
diff --git a/tools/common/include/undostack.hpp b/tools/common/include/undostack.hpp
index 543074c..c192876 100755
--- a/tools/common/include/undostack.hpp
+++ b/tools/common/include/undostack.hpp
@@ -6,8 +6,6 @@
 
 class Command {
 public:
-    virtual ~Command() {}
-    
     std::string stored_name;
     
     std::string get_name() {