refactor: add override specifiers to virtual functions for clarity and safety

Author: revmischa

src/libprojectM/Renderer/Backend/OpenGL/OpenGLCopyTexture.hpp

@@ -16,7 +16,11 @@ class OpenGLCopyTexture : public CopyTexture, public OpenGLRenderItem
     OpenGLCopyTexture();
     ~OpenGLCopyTexture() = default;
 
-    void InitVertexAttrib();
+    // Mark override for clarity and to avoid hiding warnings
+    void InitVertexAttrib() override;
+
+    // Mark override for clarity and to avoid hiding warnings
+    void Init() override { OpenGLRenderItem::Init(); }
 
     void Draw(const std::shared_ptr<class Texture>& originalTexture,
               bool flipVertical = false, bool flipHorizontal = false) override;

src/libprojectM/Renderer/Backend/OpenGL/OpenGLPresetTransition.hpp

@@ -18,8 +18,12 @@ class OpenGLPresetTransition : public PresetTransition, public OpenGLRenderItem
                            double durationSeconds,
                            double transitionStartTime);
 
+    // Mark override for clarity and to avoid hiding warnings
     void InitVertexAttrib() override;
 
+    // Mark override for clarity and to avoid hiding warnings
+    void Init() override { OpenGLRenderItem::Init(); }
+
     void Draw(const Preset& oldPreset,
               const Preset& newPreset,
               const RenderContext& context,

src/libprojectM/Renderer/Backend/OpenGL/OpenGLRenderItem.hpp

@@ -18,10 +18,11 @@ class OpenGLRenderItem : public ::libprojectM::Renderer::RenderItem
     OpenGLRenderItem();
     virtual ~OpenGLRenderItem();
 
-    virtual void InitVertexAttrib();
+    // Mark override for clarity and to avoid hiding warnings
+    void InitVertexAttrib() override;
 
-    // Override Init to provide OpenGL-specific initialization
-    virtual void Init();
+    // Mark override for clarity and to avoid hiding warnings
+    void Init() override;
 
 protected:
     GLuint m_vboID{0};