refactor: move shadows-related code to separate module

src/graphics/core/Shadows.hpp

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <memory>
+#include <functional>
+
+#include "typedefs.hpp"
+#include "window/Camera.hpp"
+
+class Shader;
+class Level;
+class Assets;
+struct Weather;
+class DrawContext;
+struct EngineSettings;
+class ShadowMap;
+
+class Shadows {
+public:
+    Shadows(const Level& level);
+    ~Shadows();
+
+    void setup(Shader& shader, const Weather& weather);
+    void setQuality(int quality);
+    void refresh(
+        const Camera& camera,
+        const DrawContext& pctx,
+        std::function<void(Camera&)> renderShadowPass
+    );
+private:
+    const Level& level;
+    bool shadows = false;
+    Camera shadowCamera;
+    Camera wideShadowCamera;
+    std::unique_ptr<ShadowMap> shadowMap;
+    std::unique_ptr<ShadowMap> wideShadowMap;
+    int quality = 0;
+
+    void generateShadowsMap(
+        const Camera& camera,
+        const DrawContext& pctx,
+        ShadowMap& shadowMap,
+        Camera& shadowCamera,
+        float scale,
+        std::function<void(Camera&)> renderShadowPass
+    );
+};