Renderer: rewrite render scheduling (#8683)

This rewrites renderer scheduling. Occlusion is now unified in a new Pass type.

src/render/pass/ShadowPassElement.hpp

@@ -0,0 +1,26 @@
+#pragma once
+#include "PassElement.hpp"
+
+class CHyprDropShadowDecoration;
+
+class CShadowPassElement : public IPassElement {
+  public:
+    struct SShadowData {
+        CHyprDropShadowDecoration* deco = nullptr;
+        float                      a    = 1.F;
+    };
+
+    CShadowPassElement(const SShadowData& data_);
+    virtual ~CShadowPassElement() = default;
+
+    virtual void        draw(const CRegion& damage);
+    virtual bool        needsLiveBlur();
+    virtual bool        needsPrecomputeBlur();
+
+    virtual const char* passName() {
+        return "CShadowPassElement";
+    }
+
+  private:
+    SShadowData data;
+};