shadowRendererDirectional.h

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// SPDX-License-Identifier: Apache-2.0
// Copyright 2025-2026 Arnis Lektauers
//
// Created by Arnis Lektauers on 18.10.2025.
//
#pragma once
 
#include <memory>
#include <unordered_map>
#include <vector>
 
#include "platform/graphics/renderPass.h"
#include "scene/camera.h"
#include "scene/frameGraph.h"
#include "scene/light.h"
 
namespace visutwin::canvas
{
    class RenderPassShadowDirectional;
    class Renderer;
    class ShadowRenderer;
 
    class ShadowRendererDirectional
    {
    public:
        ShadowRendererDirectional(const std::shared_ptr<GraphicsDevice>& device, Renderer* renderer, ShadowRenderer* shadowRenderer);
 
        // Sets up the shadow camera for a directional light: positions it to cover the scene
        // camera's frustum, sets orthographic projection, and snaps to texel grid for stability.
        // lines 72-201.
        void cull(Light* light, Camera* camera);
 
        std::shared_ptr<RenderPass> getLightRenderPass(Light* light, Camera* camera, int face, bool clearRenderTarget,
            bool allCascadesRendering);
 
        void buildNonClusteredRenderPasses(FrameGraph* frameGraph,
            const std::unordered_map<Camera*, std::vector<Light*>>& cameraDirShadowLights);
 
        // Compute per-cascade split distances using linear-logarithmic blend.
        // lines 204-216.
        static void generateSplitDistances(Light* light, float nearDist, float farDist);
 
    private:
        Renderer* _renderer = nullptr;
        ShadowRenderer* _shadowRenderer = nullptr;
        std::shared_ptr<GraphicsDevice> _device;
    };
}