Formalize directional shadow runtime contracts

2026-04-13 23:11:28 +08:00
parent 4362008b39
commit 0d6b8bf7d8
15 changed files with 740 additions and 178 deletions
--- a/docs/plan/Renderer_C++层第一阶段重构计划_RenderGraph前_2026-04-13.md
+++ b/docs/plan/Renderer_C++层第一阶段重构计划_RenderGraph前_2026-04-13.md
@@ -0,0 +1,462 @@
+# Renderer C++层第一阶段重构计划（Render Graph 前）
+
+日期：`2026-04-13`
+
+## 1. 文档定位
+
+这份计划只处理 `Render Graph` 之前的那一步，也就是把当前 `Rendering` 原生主链先整理成一个可长期演进的正式架构。
+
+这一步的目标不是新增大功能，而是先把下面这些边界收口：
+
+1. `SceneRenderer / CameraRenderer / SceneRenderRequestPlanner` 的职责边界
+2. `RenderSceneExtractor / RenderSceneData / VisibleRenderItem` 的数据边界
+3. `RenderPipeline / RenderPass / BuiltinForwardPipeline` 的执行边界
+4. Runtime 主链与 Editor 注入点的边界
+
+这一步做完之后，下一阶段才适合引入真正的 `Render Graph`。
+
+---
+
+## 2. 关于 Render Graph 的结论
+
+结论很明确：
+
+1. `Render Graph` 应该先做在 `C++ native` 层
+2. 它不应该直接作为第一阶段的一部分
+3. 第一阶段的任务，是先把当前 native renderer 收口到足够清晰，避免后面只是把现有混乱机械搬进 graph
+
+后面的目标结构应该是：
+
+`RHI -> Native Render Kernel -> Render Graph -> SRP-like Contract -> Universal Renderer -> C# Custom Pipeline`
+
+其中：
+
+1. `Render Graph` 属于 `Native Render Kernel`
+2. `C#` 层以后可以编排 pass，但图资源生命周期、资源状态、barrier、跨 pass 读写依赖仍应先由 native graph 掌控
+
+---
+
+## 3. 当前代码里的真实主链
+
+当前项目并不是没有架构，而是已经形成了一条手工编排的 mini-SRP 主链：
+
+1. `SceneRenderRequestPlanner`
+   - 收集 camera
+   - 生成 `CameraRenderRequest`
+   - 负责方向光阴影规划参数
+2. `SceneRenderer`
+   - 调 planner
+   - 解析 final color policy
+   - 为 post-process / final-output 附加 fullscreen stage request
+3. `CameraRenderer`
+   - 做 shadow request resolve
+   - 提取 `RenderSceneData`
+   - 按固定 stage 顺序执行
+4. `BuiltinForwardPipeline`
+   - 负责主场景绘制
+   - 同时背着 shader 绑定、PSO 缓存、材质资源解析、skybox、splat、volumetric 等大量职责
+
+对应的当前入口主要是：
+
+1. `engine/include/XCEngine/Rendering/Execution/SceneRenderer.h`
+2. `engine/include/XCEngine/Rendering/Execution/CameraRenderer.h`
+3. `engine/include/XCEngine/Rendering/Planning/SceneRenderRequestPlanner.h`
+4. `engine/include/XCEngine/Rendering/Planning/CameraRenderRequest.h`
+5. `engine/include/XCEngine/Rendering/FrameData/RenderSceneData.h`
+6. `engine/include/XCEngine/Rendering/FrameData/VisibleRenderItem.h`
+7. `engine/include/XCEngine/Rendering/RenderPipeline.h`
+8. `engine/include/XCEngine/Rendering/RenderPipelineAsset.h`
+9. `engine/include/XCEngine/Rendering/Pipelines/BuiltinForwardPipeline.h`
+10. `engine/src/Rendering/Execution/SceneRenderer.cpp`
+11. `engine/src/Rendering/Execution/CameraRenderer.cpp`
+12. `engine/src/Rendering/Extraction/RenderSceneExtractor.cpp`
+13. `engine/src/Rendering/Pipelines/BuiltinForwardPipeline.cpp`
+14. `engine/src/Rendering/Pipelines/Internal/BuiltinForwardPipelineResources.cpp`
+
+---
+
+## 4. 当前真正的问题
+
+当前主要不是“功能太少”，而是“职责层次还不够正式”。
+
+### 4.1 request、plan、execution 混在一起
+
+`CameraRenderRequest` 现在既像外部请求，又像内部执行计划，还夹带了一部分 runtime surface / fullscreen chain 组织信息。  
+`SceneRenderer` 也同时承担了 request build、final color resolve、fullscreen intermediate surface ownership 这几类事情。
+
+这样的问题是：
+
+1. 后面很难区分“用户想渲染什么”和“引擎决定怎么执行”
+2. Editor 也会继续直接依赖底层 stage 细节
+3. Render Graph 以后很难接到一个稳定的 frame plan 输入
+
+### 4.2 extraction 数据还偏早期
+
+`RenderSceneExtractor` 现在能工作，但产物仍然偏“把可见对象收集成数组”。  
+它还没有正式长成后续 SRP / Render Graph 真正需要的那种中间层：
+
+1. `CullingResults`
+2. `RendererList`
+3. `FilteringSettings`
+4. `SortingSettings`
+5. `DrawSettings`
+
+如果这层不先正式化，后面 forward、deferred、shadow、object-id、editor overlay 都会继续各自拿 `visibleItems` 做自己的隐式解释。
+
+### 4.3 BuiltinForwardPipeline 过重
+
+当前 `BuiltinForwardPipeline` 不只是一个 renderer，它已经同时包含：
+
+1. 主场景 pass 编排
+2. 材质资源布局解析
+3. descriptor set 组织
+4. pipeline state cache
+5. lighting / shadow 绑定
+6. skybox 逻辑
+7. gaussian splat 特殊路径
+8. volumetric 特殊路径
+
+这会带来两个后果：
+
+1. 后面任何主场景新能力都会继续往这个类里堆
+2. 未来要抽 `Universal Renderer` 或切出 `Deferred` 时，拆分成本会很高
+
+### 4.4 runtime 主线和 editor 扩展点还没正式隔离
+
+现在 Editor 已经深度依赖 request stage 注入点，这个方向本身没错，但 contract 还不够正式。  
+如果不先收口，后面 graph 化时 editor 特殊路径会变成额外复杂度来源。
+
+### 4.5 pipeline contract 还不够像未来的 SRP 底座
+
+当前 `RenderPipeline` 还是：
+
+`Render(context, surface, sceneData)`
+
+这个接口对当前 builtin forward 足够，但对未来这些东西不够：
+
+1. renderer list
+2. graph resource declaration
+3. per-frame context
+4. pass feature 注入
+5. 多渲染路径共存
+
+第一阶段不要求一步到位，但至少要把它朝这个方向整理。
+
+---
+
+## 5. 本阶段明确不做的事
+
+为了保证收口不失控，这一阶段明确不做下面这些：
+
+1. 不引入真正运行时 `Render Graph`
+2. 不做完整 `Deferred Renderer`
+3. 不做 `C# SRP` 暴露
+4. 不重写 RHI
+5. 不新增大型渲染特性来打断架构收口
+
+本阶段只做一件事：
+
+`把当前 native rendering layer 整理成 Render Graph 之前的正式形态`
+
+---
+
+## 6. 第一阶段完成后应该达到什么状态
+
+本阶段完成后，native renderer 至少应满足下面这些条件：
+
+1. 外部 request、内部 frame plan、实际 execution 三层语义分开
+2. extraction / culling / draw organization 有正式中间层，不再只靠裸 `visibleItems`
+3. `BuiltinForwardPipeline` 明显瘦身，不再继续当总垃圾桶
+4. runtime pass 与 editor pass 有明确注入 contract
+5. 后续 `Render Graph` 能接一个稳定的 `Frame Plan + Renderer Lists + Resource Needs` 输入
+
+---
+
+## 7. 第一阶段的重构原则
+
+### 7.1 先 formalize，再 graphize
+
+先把 contract 和边界做清楚，再做 graph。  
+不要反过来。
+
+### 7.2 不破坏现有主链闭环
+
+当前 `Scene / Game / Editor Viewport` 已经能跑通，第一阶段不能为了“好看”把现有可运行链条打散。
+
+### 7.3 新中间层优先 native internal
+
+这一阶段新补的 `Frame Plan`、`CullingResults`、`RendererList`、`DrawSettings` 都先是 C++ 内部契约，不急着暴露给 C#。
+
+### 7.4 先解耦职责，再决定目录长相
+
+不要先做大范围目录搬家。  
+先把职责拆开，目录只是最后的外显结果。
+
+### 7.5 editor contract 正式化，但不去特殊化主链
+
+Editor 的 object-id、outline、grid、overlay 依然要保留，但它们应该依附在正式 contract 上，而不是继续共享 runtime 的隐式细节。
+
+---
+
+## 8. 工作包拆分
+
+## 工作包 A：request / frame plan 分层
+
+目标：
+
+把“用户想渲染什么”和“引擎这帧怎么执行”拆开。
+
+建议结果：
+
+1. 保留 `CameraRenderRequest` 作为外部请求描述
+2. 新增内部 `CameraFramePlan` 或等价类型，承载：
+   - 实际启用的 stage
+   - fullscreen chain
+   - resolved target/surface
+   - 阴影计划结果
+   - editor 注入点
+3. `SceneRenderer` 只负责：
+   - 请求收集
+   - 请求排序
+   - request -> frame plan 转换
+4. `CameraRenderer` 只负责：
+   - frame plan 执行
+   - 调 scene extraction
+   - 调 pipeline / standalone pass
+
+优先涉及文件：
+
+1. `engine/include/XCEngine/Rendering/Planning/CameraRenderRequest.h`
+2. `engine/include/XCEngine/Rendering/Execution/SceneRenderer.h`
+3. `engine/src/Rendering/Execution/SceneRenderer.cpp`
+4. `engine/include/XCEngine/Rendering/Execution/CameraRenderer.h`
+5. `engine/src/Rendering/Execution/CameraRenderer.cpp`
+
+完成标准：
+
+1. request 不再混入过多 runtime-owned intermediate state
+2. frame plan 成为 camera 执行的正式输入
+3. SceneRenderer 和 CameraRenderer 的边界可以一句话说清
+
+## 工作包 B：scene extraction -> culling results / renderer list
+
+目标：
+
+把当前 `RenderSceneExtractor` 的数组式输出，推进为后续 SRP/RenderGraph 可用的原生中间层。
+
+建议结果：
+
+1. 在 native 层引入等价于以下概念的类型：
+   - `CullingResults`
+   - `RendererListDesc`
+   - `RendererList`
+   - `FilteringSettings`
+   - `SortingSettings`
+   - `DrawSettings`
+2. `RenderSceneData` 不再承担过多“什么都往里塞”的职责
+3. `VisibleRenderItem` 继续保留为底层记录，但不再直接成为所有 pass 的唯一公共输入
+4. shadow、main scene、object-id 等路径逐步改为消费 `RendererList`
+
+优先涉及文件：
+
+1. `engine/include/XCEngine/Rendering/FrameData/RenderSceneData.h`
+2. `engine/include/XCEngine/Rendering/FrameData/VisibleRenderItem.h`
+3. `engine/src/Rendering/Extraction/RenderSceneExtractor.cpp`
+4. `engine/include/XCEngine/Rendering/Extraction/`
+5. `engine/include/XCEngine/Rendering/Builtin/`
+
+完成标准：
+
+1. opaque、transparent、shadow、object-id 至少能共用同一套 draw organization contract
+2. 后面新增 deferred 时，不需要再发明第二套“可见对象数组解释逻辑”
+
+## 工作包 C：pipeline contract 收口
+
+目标：
+
+把当前 `RenderPipeline / RenderPass / RenderPipelineAsset` 收口到更像未来 SRP native kernel 的形态。
+
+建议结果：
+
+1. 继续保留 `RenderPipelineAsset -> RenderPipeline` 这条总方向
+2. 明确区分：
+   - pipeline asset：配置与默认策略
+   - pipeline runtime：本帧执行
+   - standalone pass：独立功能 pass
+3. 给主场景 pipeline 引入更正式的执行输入，而不是继续只吃 `surface + sceneData`
+4. 为下一阶段 graph 化预留清晰输入面：
+   - frame context
+   - renderer lists
+   - per-frame resources
+
+优先涉及文件：
+
+1. `engine/include/XCEngine/Rendering/RenderPipeline.h`
+2. `engine/include/XCEngine/Rendering/RenderPipelineAsset.h`
+3. `engine/include/XCEngine/Rendering/RenderPass.h`
+4. `engine/include/XCEngine/Rendering/Pipelines/BuiltinForwardPipeline.h`
+
+完成标准：
+
+1. 主 pipeline 输入面能明显映射到未来 `Universal Renderer`
+2. standalone pass 与 main scene pipeline 的边界清楚
+
+## 工作包 D：BuiltinForwardPipeline 瘦身
+
+目标：
+
+把 `BuiltinForwardPipeline` 从“大一统实现类”拆成可长期维护的 renderer 内部模块。
+
+建议结果：
+
+1. 按职责切成内部模块或 helper：
+   - main scene draw
+   - skybox draw
+   - lighting binding
+   - shadow binding
+   - material binding
+   - pipeline state cache
+   - per-frame resource cache
+2. `GaussianSplat` 和 `Volumetric` 继续保留，但从“主 pipeline 杂糅逻辑”变成清晰的 feature-style 子模块
+3. `BuiltinForwardPipelineResources.cpp` 里和运行时编排无关的资源/绑定组织进一步下沉
+
+优先涉及文件：
+
+1. `engine/include/XCEngine/Rendering/Pipelines/BuiltinForwardPipeline.h`
+2. `engine/src/Rendering/Pipelines/BuiltinForwardPipeline.cpp`
+3. `engine/src/Rendering/Pipelines/Internal/BuiltinForwardPipelineResources.cpp`
+4. `engine/include/XCEngine/Rendering/Materials/RenderMaterialResolve.h`
+
+完成标准：
+
+1. `BuiltinForwardPipeline` 主类显著变薄
+2. 新增一种主场景能力时，不需要继续把所有逻辑堆回同一个 cpp
+
+## 工作包 E：editor 注入点正式化
+
+目标：
+
+保留当前 editor 渲染能力，但把它从“依赖阶段细节”变成“依赖正式 extension contract”。
+
+建议结果：
+
+1. 继续保留：
+   - object-id
+   - outline
+   - grid
+   - overlay
+2. 把这些能力明确分成：
+   - runtime stage
+   - editor-only extension stage
+3. 收口 `RenderPassSequence` 在 request 上的使用边界，避免后续 graph 化时出现“谁都能往 request 里塞东西”的状态
+
+优先涉及文件：
+
+1. `engine/include/XCEngine/Rendering/Planning/CameraRenderRequest.h`
+2. `editor/src/Viewport/SceneViewportRenderPlan.h`
+3. `editor/src/Viewport/`
+4. `engine/src/Rendering/Execution/CameraRenderer.cpp`
+
+完成标准：
+
+1. Editor 仍能完整接入当前主链
+2. 但 editor 不再直接绑死 runtime 内部实现细节
+
+## 工作包 F：测试与文档同步
+
+目标：
+
+把第一阶段重构做成可回归、可交接的正式收口，而不是一次只靠手工验证的大重排。
+
+建议结果：
+
+1. 补 `tests/Rendering/unit`
+2. 保底回归现有 `tests/Rendering/integration`
+3. 必要时补 editor viewport 级验证
+4. 更新 API 文档与后续计划入口
+
+完成标准：
+
+1. request / extractor / pipeline 边界都有对应测试覆盖
+2. 当前 forward、shadow、object-id、editor scene view 不回退
+
+---
+
+## 9. 执行顺序
+
+必须按下面的顺序推进：
+
+1. 先做工作包 A
+2. 再做工作包 B
+3. 再做工作包 C
+4. 然后做工作包 D
+5. 接着做工作包 E
+6. 最后统一做工作包 F
+
+原因：
+
+1. 不先分清 request 和 frame plan，后面所有 contract 都会悬空
+2. 不先把 extraction 推进到 `renderer list` 层，pipeline 收口只是表面整理
+3. 不先把 pipeline contract 稳住，`BuiltinForwardPipeline` 的瘦身会缺少稳定目标
+4. 不先把 native 主线收紧，editor contract 很容易继续沿着旧细节扩张
+
+---
+
+## 10. 建议新增或调整的 native 类型
+
+第一阶段不要求名字完全按这个来，但建议至少出现这些等价层：
+
+1. `CameraFramePlan`
+2. `FrameExecutionContext`
+3. `CullingResults`
+4. `RendererListDesc`
+5. `RendererList`
+6. `DrawSettings`
+7. `FilteringSettings`
+8. `SortingSettings`
+9. `EditorRenderExtensions` 或等价 editor 注入描述
+
+注意：
+
+1. 这些类型先是 `C++ internal contract`
+2. 这一阶段不急着桥接到 `managed`
+3. 下一阶段 `Render Graph` 会直接消费其中一部分
+
+---
+
+## 11. 这一阶段完成的验收标准
+
+当以下条件同时成立时，这一阶段才算完成：
+
+1. `SceneRenderer / CameraRenderer / Planner` 三者职责边界稳定
+2. native 渲染主链内部已经形成 request、frame plan、execution 三层
+3. `RenderSceneExtractor` 不再只是输出裸数组，而是能支持正式的 draw organization
+4. `BuiltinForwardPipeline` 不再承担明显超载职责
+5. editor 的注入点已经正规化，且没有破坏当前 Scene View / Game View 能力
+6. 现有 forward、shadow、post-process、final-output、object-id、overlay 主路径回归通过
+
+---
+
+## 12. 下一阶段如何接 Render Graph
+
+等本阶段完成后，下一阶段才进入真正的 `Render Graph`。
+
+那时的接法应该是：
+
+1. `CameraFramePlan` 提供本帧逻辑阶段与 feature 需求
+2. `CullingResults / RendererList` 提供 draw 输入
+3. `FrameExecutionContext` 提供本帧统一资源上下文
+4. `Render Graph` 负责：
+   - pass declaration
+   - resource creation/import
+   - read/write dependency
+   - barrier / lifetime
+   - transient resource reuse
+
+也就是说，`Render Graph` 不是来替代第一阶段，而是建立在第一阶段之上。
+
+---
+
+## 13. 一句话结论
+
+当前最佳路线不是立刻补 `Deferred`，也不是立刻补 `Render Graph`，而是先把你现有这条 native rendering 主链整理成真正的 `Render Kernel v1`；这一步做实了，后面的 `Render Graph`、`Universal Renderer`、`C# SRP` 才会接得稳。
--- a/engine/CMakeLists.txt
+++ b/engine/CMakeLists.txt
@@ -478,11 +478,17 @@ add_library(XCEngine STATIC
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Builtin/BuiltinPassTypes.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Builtin/BuiltinPassMetadataUtils.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Builtin/BuiltinPassLayoutUtils.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Builtin/BuiltinPassContract.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Execution/CameraFramePlan.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Execution/CameraRenderer.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Execution/DirectionalShadowExecutionState.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Execution/DrawSettings.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Execution/FrameExecutionContext.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Execution/ScenePhase.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Execution/SceneRenderer.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/FrameData/CullingResults.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/FrameData/RenderCameraData.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/FrameData/RenderSceneData.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/FrameData/RendererListUtils.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/FrameData/VisibleGaussianSplatItem.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/FrameData/VisibleRenderItem.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/FrameData/VisibleVolumeItem.h
@@ -500,8 +506,11 @@ add_library(XCEngine STATIC
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/RenderPipeline.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/RenderPipelineAsset.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/RenderSurface.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/SceneRenderFeaturePass.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Caches/RenderResourceCache.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Caches/DirectionalShadowSurfaceCache.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Shadow/DirectionalShadowData.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Shadow/DirectionalShadowRuntime.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Passes/BuiltinDepthStylePassBase.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Passes/BuiltinDepthOnlyPass.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/Rendering/Passes/BuiltinShadowCasterPass.h
@@ -540,6 +549,8 @@ add_library(XCEngine STATIC
    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Planning/SceneRenderRequestPlanner.cpp
    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Planning/Internal/DirectionalShadowPlanning.h
    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Planning/Internal/DirectionalShadowPlanning.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Shadow/DirectionalShadowData.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Shadow/DirectionalShadowRuntime.cpp
    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Execution/SceneRenderer.cpp
    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Pipelines/BuiltinForwardPipeline.cpp
    ${CMAKE_CURRENT_SOURCE_DIR}/src/Rendering/Pipelines/Internal/BuiltinForwardPipelineSkybox.cpp
--- a/engine/include/XCEngine/Rendering/Builtin/BuiltinPassContract.h
+++ b/engine/include/XCEngine/Rendering/Builtin/BuiltinPassContract.h
@@ -1,3 +0,0 @@
-#pragma once
-
-#include <XCEngine/Rendering/Builtin/BuiltinPassLayoutUtils.h>
--- a/engine/include/XCEngine/Rendering/Caches/DirectionalShadowSurfaceCache.h
+++ b/engine/include/XCEngine/Rendering/Caches/DirectionalShadowSurfaceCache.h
@@ -14,6 +14,16 @@ namespace Rendering {
 struct DirectionalShadowRenderPlan;
 struct RenderContext;

+struct DirectionalShadowSurfaceAllocation {
+    RenderSurface surface = {};
+    RHI::RHIResourceView* depthShaderView = nullptr;
+
+    bool IsValid() const {
+        return surface.GetDepthAttachment() != nullptr &&
+               depthShaderView != nullptr;
+    }
+};
+
 class DirectionalShadowSurfaceCache {
 public:
    DirectionalShadowSurfaceCache() = default;
@@ -21,10 +31,9 @@ public:
    DirectionalShadowSurfaceCache& operator=(const DirectionalShadowSurfaceCache&) = delete;
    ~DirectionalShadowSurfaceCache();

-    bool EnsureSurface(const RenderContext& context, const DirectionalShadowRenderPlan& plan);
-
-    const RenderSurface& GetSurface() const { return m_surface; }
-    RHI::RHIResourceView* GetDepthShaderView() const { return m_depthShaderView; }
+    const DirectionalShadowSurfaceAllocation* Resolve(
+        const RenderContext& context,
+        const DirectionalShadowRenderPlan& plan);

 private:
    bool Matches(const RenderContext& context, const DirectionalShadowRenderPlan& plan) const;
@@ -35,8 +44,7 @@ private:
    uint32_t m_height = 0;
    RHI::RHITexture* m_depthTexture = nullptr;
    RHI::RHIResourceView* m_depthView = nullptr;
-    RHI::RHIResourceView* m_depthShaderView = nullptr;
-    RenderSurface m_surface = {};
+    DirectionalShadowSurfaceAllocation m_allocation = {};
 };

 } // namespace Rendering
--- a/engine/include/XCEngine/Rendering/Execution/CameraRenderer.h
+++ b/engine/include/XCEngine/Rendering/Execution/CameraRenderer.h
@@ -20,7 +20,8 @@ class RHIResourceView;

 namespace Rendering {

-class DirectionalShadowSurfaceCache;
+struct DirectionalShadowExecutionState;
+class DirectionalShadowRuntime;
 class FullscreenPassSurfaceCache;
 class RenderSurface;
 class RenderPipelineAsset;
@@ -54,17 +55,13 @@ public:

 private:
    void ResetPipeline(std::unique_ptr<RenderPipeline> pipeline);
-    bool ResolveShadowCasterRequest(
-        const CameraFramePlan& plan,
-        ShadowCasterRenderRequest& outResolvedShadowCaster,
-        RHI::RHIResourceView*& outShadowMapView);
    bool BuildSceneDataForPlan(
        const CameraFramePlan& plan,
-        RHI::RHIResourceView* shadowMapView,
+        const DirectionalShadowExecutionState& shadowState,
        RenderSceneData& outSceneData);
    bool ExecuteRenderPlan(
        const CameraFramePlan& plan,
-        const ShadowCasterRenderRequest& resolvedShadowCaster,
+        const DirectionalShadowExecutionState& shadowState,
        const RenderSceneData& sceneData);

    RenderSceneExtractor m_sceneExtractor;
@@ -73,7 +70,7 @@ private:
    std::unique_ptr<RenderPass> m_objectIdPass;
    std::unique_ptr<RenderPass> m_depthOnlyPass;
    std::unique_ptr<RenderPass> m_shadowCasterPass;
-    std::unique_ptr<DirectionalShadowSurfaceCache> m_directionalShadowSurface;
+    std::unique_ptr<DirectionalShadowRuntime> m_directionalShadowRuntime;
    std::unique_ptr<FullscreenPassSurfaceCache> m_postProcessSurfaceCache;
    std::unique_ptr<FullscreenPassSurfaceCache> m_finalOutputSurfaceCache;
 };
--- a/engine/include/XCEngine/Rendering/Execution/DirectionalShadowExecutionState.h
+++ b/engine/include/XCEngine/Rendering/Execution/DirectionalShadowExecutionState.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <XCEngine/Rendering/Planning/CameraRenderRequest.h>
+#include <XCEngine/Rendering/Shadow/DirectionalShadowData.h>
+
+namespace XCEngine {
+namespace Rendering {
+
+struct DirectionalShadowExecutionState {
+    ShadowCasterRenderRequest shadowCasterRequest = {};
+    RenderDirectionalShadowData shadowData = {};
+
+    bool HasShadowPass() const {
+        return shadowCasterRequest.IsRequested();
+    }
+
+    bool HasShadowSampling() const {
+        return shadowData.IsValid();
+    }
+};
+
+} // namespace Rendering
+} // namespace XCEngine
--- a/engine/include/XCEngine/Rendering/FrameData/RenderSceneData.h
+++ b/engine/include/XCEngine/Rendering/FrameData/RenderSceneData.h
@@ -6,7 +6,7 @@
 #include <XCEngine/Rendering/FrameData/CullingResults.h>
 #include <XCEngine/Rendering/FrameData/RenderCameraData.h>
 #include <XCEngine/Rendering/FrameData/RenderEnvironmentData.h>
-#include <XCEngine/Rendering/Shadow/DirectionalShadowSettings.h>
+#include <XCEngine/Rendering/Shadow/DirectionalShadowData.h>
 #include <XCEngine/Rendering/FrameData/VisibleGaussianSplatItem.h>
 #include <XCEngine/Rendering/FrameData/VisibleRenderItem.h>
 #include <XCEngine/Rendering/FrameData/VisibleVolumeItem.h>
@@ -21,10 +21,6 @@ namespace Components {
 class CameraComponent;
 } // namespace Components

-namespace RHI {
-class RHIResourceView;
-} // namespace RHI
-
 namespace Rendering {

 struct RenderDirectionalLightData {
@@ -53,42 +49,6 @@ struct RenderAdditionalLightData {
    float spotAngle = 0.0f;
 };

-struct RenderDirectionalShadowMapMetrics {
-    Math::Vector2 inverseMapSize = Math::Vector2::Zero();
-    float worldTexelSize = 0.0f;
-    float padding = 0.0f;
-};
-
-static_assert(
-    sizeof(RenderDirectionalShadowMapMetrics) == sizeof(float) * 4u,
-    "RenderDirectionalShadowMapMetrics must stay float4-sized for GPU constant layout");
-
-struct RenderDirectionalShadowSamplingData {
-    float enabled = 0.0f;
-    DirectionalShadowSamplingSettings settings = {};
-};
-
-static_assert(
-    sizeof(RenderDirectionalShadowSamplingData) == sizeof(float) * 4u,
-    "RenderDirectionalShadowSamplingData must stay float4-sized for GPU constant layout");
-
-struct RenderDirectionalShadowCasterBiasData {
-    DirectionalShadowCasterBiasSettings settings = {};
-};
-
-struct RenderDirectionalShadowData {
-    bool enabled = false;
-    Math::Matrix4x4 viewProjection = Math::Matrix4x4::Identity();
-    RenderDirectionalShadowMapMetrics mapMetrics = {};
-    RenderDirectionalShadowSamplingData sampling = {};
-    RenderDirectionalShadowCasterBiasData casterBias = {};
-    RHI::RHIResourceView* shadowMap = nullptr;
-
-    bool IsValid() const {
-        return enabled && shadowMap != nullptr;
-    }
-};
-
 struct RenderLightingData {
    static constexpr uint32_t kMaxAdditionalLightCount = 8u;

--- a/engine/include/XCEngine/Rendering/Planning/CameraRenderRequest.h
+++ b/engine/include/XCEngine/Rendering/Planning/CameraRenderRequest.h
@@ -5,7 +5,7 @@
 #include <XCEngine/Rendering/RenderContext.h>
 #include <XCEngine/Rendering/RenderPass.h>
 #include <XCEngine/Rendering/RenderSurface.h>
-#include <XCEngine/Rendering/Shadow/DirectionalShadowSettings.h>
+#include <XCEngine/Rendering/Shadow/DirectionalShadowData.h>

 #include <array>
 #include <cstdint>
@@ -124,29 +124,6 @@ inline bool HasValidSingleSampleColorSource(const RenderSurface& surface) {
           surface.GetSampleQuality() == 0u;
 }

-struct DirectionalShadowRenderPlan {
-    bool enabled = false;
-    Math::Vector3 lightDirection = Math::Vector3::Back();
-    Math::Vector3 focusPoint = Math::Vector3::Zero();
-    float orthographicHalfExtent = 0.0f;
-    float texelWorldSize = 0.0f;
-    float nearClipPlane = 0.1f;
-    float farClipPlane = 0.0f;
-    DirectionalShadowSamplingSettings sampling = {};
-    DirectionalShadowCasterBiasSettings casterBias = {};
-    uint32_t mapWidth = 0;
-    uint32_t mapHeight = 0;
-    RenderCameraData cameraData = {};
-
-    bool IsValid() const {
-        return enabled &&
-               mapWidth > 0 &&
-               mapHeight > 0 &&
-               cameraData.viewportWidth == mapWidth &&
-               cameraData.viewportHeight == mapHeight;
-    }
-};
-
 struct ObjectIdRenderRequest {
    RenderSurface surface;

--- a/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowData.h
+++ b/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowData.h
@@ -0,0 +1,82 @@
+#pragma once
+
+#include <XCEngine/Core/Math/Matrix4.h>
+#include <XCEngine/Core/Math/Vector2.h>
+#include <XCEngine/Core/Math/Vector3.h>
+#include <XCEngine/Rendering/FrameData/RenderCameraData.h>
+#include <XCEngine/Rendering/Shadow/DirectionalShadowSettings.h>
+
+#include <cstdint>
+
+namespace XCEngine {
+namespace RHI {
+class RHIResourceView;
+} // namespace RHI
+
+namespace Rendering {
+
+struct DirectionalShadowRenderPlan {
+    bool enabled = false;
+    Math::Vector3 lightDirection = Math::Vector3::Back();
+    Math::Vector3 focusPoint = Math::Vector3::Zero();
+    float orthographicHalfExtent = 0.0f;
+    float texelWorldSize = 0.0f;
+    float nearClipPlane = 0.1f;
+    float farClipPlane = 0.0f;
+    DirectionalShadowSamplingSettings sampling = {};
+    DirectionalShadowCasterBiasSettings casterBias = {};
+    uint32_t mapWidth = 0;
+    uint32_t mapHeight = 0;
+    RenderCameraData cameraData = {};
+
+    bool IsValid() const {
+        return enabled &&
+               mapWidth > 0 &&
+               mapHeight > 0 &&
+               cameraData.viewportWidth == mapWidth &&
+               cameraData.viewportHeight == mapHeight;
+    }
+};
+
+struct RenderDirectionalShadowMapMetrics {
+    Math::Vector2 inverseMapSize = Math::Vector2::Zero();
+    float worldTexelSize = 0.0f;
+    float padding = 0.0f;
+};
+
+static_assert(
+    sizeof(RenderDirectionalShadowMapMetrics) == sizeof(float) * 4u,
+    "RenderDirectionalShadowMapMetrics must stay float4-sized for GPU constant layout");
+
+struct RenderDirectionalShadowSamplingData {
+    float enabled = 0.0f;
+    DirectionalShadowSamplingSettings settings = {};
+};
+
+static_assert(
+    sizeof(RenderDirectionalShadowSamplingData) == sizeof(float) * 4u,
+    "RenderDirectionalShadowSamplingData must stay float4-sized for GPU constant layout");
+
+struct RenderDirectionalShadowCasterBiasData {
+    DirectionalShadowCasterBiasSettings settings = {};
+};
+
+struct RenderDirectionalShadowData {
+    bool enabled = false;
+    Math::Matrix4x4 viewProjection = Math::Matrix4x4::Identity();
+    RenderDirectionalShadowMapMetrics mapMetrics = {};
+    RenderDirectionalShadowSamplingData sampling = {};
+    RenderDirectionalShadowCasterBiasData casterBias = {};
+    RHI::RHIResourceView* shadowMap = nullptr;
+
+    bool IsValid() const {
+        return enabled && shadowMap != nullptr;
+    }
+};
+
+RenderDirectionalShadowData BuildRenderDirectionalShadowData(
+    const DirectionalShadowRenderPlan& plan,
+    RHI::RHIResourceView* shadowMapView);
+
+} // namespace Rendering
+} // namespace XCEngine
--- a/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowRuntime.h
+++ b/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowRuntime.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <XCEngine/Rendering/Caches/DirectionalShadowSurfaceCache.h>
+#include <XCEngine/Rendering/Execution/DirectionalShadowExecutionState.h>
+
+namespace XCEngine {
+namespace Rendering {
+
+struct CameraFramePlan;
+
+class DirectionalShadowRuntime {
+public:
+    DirectionalShadowRuntime() = default;
+    DirectionalShadowRuntime(const DirectionalShadowRuntime&) = delete;
+    DirectionalShadowRuntime& operator=(const DirectionalShadowRuntime&) = delete;
+    ~DirectionalShadowRuntime() = default;
+
+    bool ResolveExecutionState(
+        const CameraFramePlan& plan,
+        DirectionalShadowExecutionState& outShadowState);
+
+private:
+    DirectionalShadowSurfaceCache m_surfaceCache;
+};
+
+} // namespace Rendering
+} // namespace XCEngine
--- a/engine/src/Rendering/Caches/DirectionalShadowSurfaceCache.cpp
+++ b/engine/src/Rendering/Caches/DirectionalShadowSurfaceCache.cpp
@@ -1,6 +1,7 @@
 #include "Rendering/Caches/DirectionalShadowSurfaceCache.h"

-#include "Rendering/Planning/CameraRenderRequest.h"
+#include "Rendering/RenderContext.h"
+#include "Rendering/Shadow/DirectionalShadowData.h"
 #include "RHI/RHIDevice.h"
 #include "RHI/RHIResourceView.h"
 #include "RHI/RHITexture.h"
@@ -18,15 +19,15 @@ DirectionalShadowSurfaceCache::~DirectionalShadowSurfaceCache() {
    Reset();
 }

-bool DirectionalShadowSurfaceCache::EnsureSurface(
+const DirectionalShadowSurfaceAllocation* DirectionalShadowSurfaceCache::Resolve(
    const RenderContext& context,
    const DirectionalShadowRenderPlan& plan) {
    if (!context.IsValid() || !plan.IsValid()) {
-        return false;
+        return nullptr;
    }

    if (Matches(context, plan)) {
-        return true;
+        return &m_allocation;
    }

    RHI::TextureDesc depthDesc = {};
@@ -43,7 +44,7 @@ bool DirectionalShadowSurfaceCache::EnsureSurface(

    RHI::RHITexture* depthTexture = context.device->CreateTexture(depthDesc);
    if (depthTexture == nullptr) {
-        return false;
+        return nullptr;
    }

    RHI::ResourceViewDesc depthViewDesc = {};
@@ -55,7 +56,7 @@ bool DirectionalShadowSurfaceCache::EnsureSurface(
    if (depthView == nullptr) {
        depthTexture->Shutdown();
        delete depthTexture;
-        return false;
+        return nullptr;
    }

    RHI::ResourceViewDesc depthShaderViewDesc = {};
@@ -68,7 +69,7 @@ bool DirectionalShadowSurfaceCache::EnsureSurface(
        delete depthView;
        depthTexture->Shutdown();
        delete depthTexture;
-        return false;
+        return nullptr;
    }

    Reset();
@@ -77,11 +78,11 @@ bool DirectionalShadowSurfaceCache::EnsureSurface(
    m_height = plan.mapHeight;
    m_depthTexture = depthTexture;
    m_depthView = depthView;
-    m_depthShaderView = depthShaderView;
-    m_surface = RenderSurface(plan.mapWidth, plan.mapHeight);
-    m_surface.SetDepthAttachment(depthView);
-    m_surface.SetSampleDesc(1u, 0u);
-    return true;
+    m_allocation.depthShaderView = depthShaderView;
+    m_allocation.surface = RenderSurface(plan.mapWidth, plan.mapHeight);
+    m_allocation.surface.SetDepthAttachment(depthView);
+    m_allocation.surface.SetSampleDesc(1u, 0u);
+    return &m_allocation;
 }

 bool DirectionalShadowSurfaceCache::Matches(
@@ -92,7 +93,7 @@ bool DirectionalShadowSurfaceCache::Matches(
           m_height == plan.mapHeight &&
           m_depthTexture != nullptr &&
           m_depthView != nullptr &&
-           m_depthShaderView != nullptr;
+           m_allocation.IsValid();
 }

 void DirectionalShadowSurfaceCache::Reset() {
@@ -102,10 +103,10 @@ void DirectionalShadowSurfaceCache::Reset() {
        m_depthView = nullptr;
    }

-    if (m_depthShaderView != nullptr) {
-        m_depthShaderView->Shutdown();
-        delete m_depthShaderView;
-        m_depthShaderView = nullptr;
+    if (m_allocation.depthShaderView != nullptr) {
+        m_allocation.depthShaderView->Shutdown();
+        delete m_allocation.depthShaderView;
+        m_allocation.depthShaderView = nullptr;
    }

    if (m_depthTexture != nullptr) {
@@ -117,7 +118,7 @@ void DirectionalShadowSurfaceCache::Reset() {
    m_device = nullptr;
    m_width = 0;
    m_height = 0;
-    m_surface = RenderSurface();
+    m_allocation = {};
 }

 } // namespace Rendering
--- a/engine/src/Rendering/Execution/CameraRenderer.cpp
+++ b/engine/src/Rendering/Execution/CameraRenderer.cpp
@@ -1,14 +1,15 @@
 #include "Rendering/Execution/CameraRenderer.h"

 #include "Components/CameraComponent.h"
-#include "Rendering/Caches/DirectionalShadowSurfaceCache.h"
 #include "Rendering/Caches/FullscreenPassSurfaceCache.h"
+#include "Rendering/Execution/DirectionalShadowExecutionState.h"
 #include "Rendering/Passes/BuiltinDepthOnlyPass.h"
 #include "Rendering/Passes/BuiltinObjectIdPass.h"
 #include "Rendering/Passes/BuiltinShadowCasterPass.h"
 #include "Rendering/Pipelines/BuiltinForwardPipeline.h"
 #include "Rendering/RenderPipelineAsset.h"
 #include "Rendering/RenderSurface.h"
+#include "Rendering/Shadow/DirectionalShadowRuntime.h"
 #include "RHI/RHIResourceView.h"
 #include "Scene/Scene.h"

@@ -305,7 +306,7 @@ RenderPassContext BuildFrameStagePassContext(
 bool ExecuteFrameStage(
    CameraFrameStage stage,
    const CameraFramePlan& plan,
-    const ShadowCasterRenderRequest& resolvedShadowCaster,
+    const DirectionalShadowExecutionState& shadowState,
    const RenderSceneData& sceneData,
    CameraFrameExecutionState& executionState) {
    const RenderPassContext passContext = BuildFrameStagePassContext(stage, plan, sceneData);
@@ -320,7 +321,7 @@ bool ExecuteFrameStage(
    case CameraFrameStage::ShadowCaster:
        return ExecuteScenePassRequest(
            executionState.shadowCasterPass,
-            resolvedShadowCaster,
+            shadowState.shadowCasterRequest,
            plan.request.context,
            sceneData);
    case CameraFrameStage::DepthOnly:
@@ -377,32 +378,6 @@ bool ExecuteFrameStage(
    }
 }

-RenderDirectionalShadowData BuildDirectionalShadowData(
-    const DirectionalShadowRenderPlan& plan,
-    RHI::RHIResourceView* shadowMapView) {
-    RenderDirectionalShadowData shadowData = {};
-    if (!plan.IsValid() || shadowMapView == nullptr) {
-        return shadowData;
-    }
-
-    shadowData.enabled = true;
-    shadowData.viewProjection = plan.cameraData.viewProjection;
-    shadowData.shadowMap = shadowMapView;
-    const float texelWorldSize = plan.texelWorldSize > Math::EPSILON
-        ? plan.texelWorldSize
-        : (plan.orthographicHalfExtent > Math::EPSILON && plan.mapWidth > 0u
-            ? (plan.orthographicHalfExtent * 2.0f) / static_cast<float>(plan.mapWidth)
-            : 0.0f);
-    shadowData.mapMetrics.inverseMapSize = Math::Vector2(
-        1.0f / static_cast<float>(plan.mapWidth),
-        1.0f / static_cast<float>(plan.mapHeight));
-    shadowData.mapMetrics.worldTexelSize = texelWorldSize;
-    shadowData.sampling.enabled = 1.0f;
-    shadowData.sampling.settings = plan.sampling;
-    shadowData.casterBias.settings = plan.casterBias;
-    return shadowData;
-}
-
 RenderEnvironmentData BuildEnvironmentData(const CameraFramePlan& plan) {
    RenderEnvironmentData environment = {};
    const RenderSurface& mainSceneSurface = plan.GetMainSceneSurface();
@@ -450,6 +425,7 @@ CameraRenderer::CameraRenderer(
    , m_objectIdPass(std::move(objectIdPass))
    , m_depthOnlyPass(std::move(depthOnlyPass))
    , m_shadowCasterPass(std::move(shadowCasterPass))
+    , m_directionalShadowRuntime(std::make_unique<DirectionalShadowRuntime>())
    , m_postProcessSurfaceCache(std::make_unique<FullscreenPassSurfaceCache>())
    , m_finalOutputSurfaceCache(std::make_unique<FullscreenPassSurfaceCache>()) {
    if (m_objectIdPass == nullptr) {
@@ -469,6 +445,7 @@ CameraRenderer::CameraRenderer(std::shared_ptr<const RenderPipelineAsset> pipeli
    , m_objectIdPass(std::make_unique<Passes::BuiltinObjectIdPass>())
    , m_depthOnlyPass(CreateDefaultDepthOnlyPass())
    , m_shadowCasterPass(CreateDefaultShadowCasterPass())
+    , m_directionalShadowRuntime(std::make_unique<DirectionalShadowRuntime>())
    , m_postProcessSurfaceCache(std::make_unique<FullscreenPassSurfaceCache>())
    , m_finalOutputSurfaceCache(std::make_unique<FullscreenPassSurfaceCache>()) {
    SetPipelineAsset(m_pipelineAsset);
@@ -544,43 +521,9 @@ void CameraRenderer::ResetPipeline(std::unique_ptr<RenderPipeline> pipeline) {
    }
 }

-bool CameraRenderer::ResolveShadowCasterRequest(
-    const CameraFramePlan& plan,
-    ShadowCasterRenderRequest& outResolvedShadowCaster,
-    RHI::RHIResourceView*& outShadowMapView) {
-    outResolvedShadowCaster = plan.shadowCaster;
-    outShadowMapView = nullptr;
-
-    if (outResolvedShadowCaster.IsRequested()) {
-        return outResolvedShadowCaster.IsValid();
-    }
-
-    if (!plan.directionalShadow.IsValid()) {
-        return true;
-    }
-
-    if (m_directionalShadowSurface == nullptr) {
-        m_directionalShadowSurface = std::make_unique<DirectionalShadowSurfaceCache>();
-    }
-
-    if (!m_directionalShadowSurface->EnsureSurface(plan.request.context, plan.directionalShadow)) {
-        return false;
-    }
-
-    outResolvedShadowCaster.surface = m_directionalShadowSurface->GetSurface();
-    outResolvedShadowCaster.clearFlags = RenderClearFlags::Depth;
-    if (!outResolvedShadowCaster.hasCameraDataOverride) {
-        outResolvedShadowCaster.hasCameraDataOverride = true;
-        outResolvedShadowCaster.cameraDataOverride = plan.directionalShadow.cameraData;
-    }
-
-    outShadowMapView = m_directionalShadowSurface->GetDepthShaderView();
-    return true;
-}
-
 bool CameraRenderer::BuildSceneDataForPlan(
    const CameraFramePlan& plan,
-    RHI::RHIResourceView* shadowMapView,
+    const DirectionalShadowExecutionState& shadowState,
    RenderSceneData& outSceneData) {
    const RenderSurface& mainSceneSurface = plan.GetMainSceneSurface();
    outSceneData = m_sceneExtractor.ExtractForCamera(
@@ -592,10 +535,7 @@ bool CameraRenderer::BuildSceneDataForPlan(
        return false;
    }

-    if (plan.directionalShadow.IsValid()) {
-        outSceneData.lighting.mainDirectionalShadow =
-            BuildDirectionalShadowData(plan.directionalShadow, shadowMapView);
-    }
+    outSceneData.lighting.mainDirectionalShadow = shadowState.shadowData;
    outSceneData.globalShaderKeywords = BuildSceneGlobalShaderKeywords(outSceneData);

    outSceneData.cameraData.clearFlags = plan.request.clearFlags;
@@ -609,7 +549,7 @@ bool CameraRenderer::BuildSceneDataForPlan(

 bool CameraRenderer::ExecuteRenderPlan(
    const CameraFramePlan& plan,
-    const ShadowCasterRenderRequest& resolvedShadowCaster,
+    const DirectionalShadowExecutionState& shadowState,
    const RenderSceneData& sceneData) {
    CameraFrameExecutionState executionState = {};
    executionState.pipeline = m_pipeline.get();
@@ -628,7 +568,7 @@ bool CameraRenderer::ExecuteRenderPlan(
        if (!ExecuteFrameStage(
                stageInfo.stage,
                plan,
-                resolvedShadowCaster,
+                shadowState,
                sceneData,
                executionState)) {
            return false;
@@ -689,24 +629,24 @@ bool CameraRenderer::Render(
        return false;
    }

-    ShadowCasterRenderRequest resolvedShadowCaster = {};
-    RHI::RHIResourceView* shadowMapView = nullptr;
-    if (!ResolveShadowCasterRequest(plan, resolvedShadowCaster, shadowMapView)) {
+    DirectionalShadowExecutionState shadowState = {};
+    if (m_directionalShadowRuntime == nullptr ||
+        !m_directionalShadowRuntime->ResolveExecutionState(plan, shadowState)) {
        Debug::Logger::Get().Error(
            Debug::LogCategory::Rendering,
-            "CameraRenderer::Render failed: ResolveShadowCasterRequest returned false");
+            "CameraRenderer::Render failed: DirectionalShadowRuntime::ResolveExecutionState returned false");
        return false;
    }

    RenderSceneData sceneData = {};
-    if (!BuildSceneDataForPlan(plan, shadowMapView, sceneData)) {
+    if (!BuildSceneDataForPlan(plan, shadowState, sceneData)) {
        Debug::Logger::Get().Error(
            Debug::LogCategory::Rendering,
            "CameraRenderer::Render failed: BuildSceneDataForPlan returned false");
        return false;
    }

-    if (!ExecuteRenderPlan(plan, resolvedShadowCaster, sceneData)) {
+    if (!ExecuteRenderPlan(plan, shadowState, sceneData)) {
        Debug::Logger::Get().Error(
            Debug::LogCategory::Rendering,
            "CameraRenderer::Render failed: ExecuteRenderPlan returned false");
--- a/engine/src/Rendering/Shadow/DirectionalShadowData.cpp
+++ b/engine/src/Rendering/Shadow/DirectionalShadowData.cpp
@@ -0,0 +1,33 @@
+#include "Rendering/Shadow/DirectionalShadowData.h"
+
+namespace XCEngine {
+namespace Rendering {
+
+RenderDirectionalShadowData BuildRenderDirectionalShadowData(
+    const DirectionalShadowRenderPlan& plan,
+    RHI::RHIResourceView* shadowMapView) {
+    RenderDirectionalShadowData shadowData = {};
+    if (!plan.IsValid() || shadowMapView == nullptr) {
+        return shadowData;
+    }
+
+    shadowData.enabled = true;
+    shadowData.viewProjection = plan.cameraData.viewProjection;
+    shadowData.shadowMap = shadowMapView;
+    const float texelWorldSize = plan.texelWorldSize > Math::EPSILON
+        ? plan.texelWorldSize
+        : (plan.orthographicHalfExtent > Math::EPSILON && plan.mapWidth > 0u
+            ? (plan.orthographicHalfExtent * 2.0f) / static_cast<float>(plan.mapWidth)
+            : 0.0f);
+    shadowData.mapMetrics.inverseMapSize = Math::Vector2(
+        1.0f / static_cast<float>(plan.mapWidth),
+        1.0f / static_cast<float>(plan.mapHeight));
+    shadowData.mapMetrics.worldTexelSize = texelWorldSize;
+    shadowData.sampling.enabled = 1.0f;
+    shadowData.sampling.settings = plan.sampling;
+    shadowData.casterBias.settings = plan.casterBias;
+    return shadowData;
+}
+
+} // namespace Rendering
+} // namespace XCEngine
--- a/engine/src/Rendering/Shadow/DirectionalShadowRuntime.cpp
+++ b/engine/src/Rendering/Shadow/DirectionalShadowRuntime.cpp
@@ -0,0 +1,44 @@
+#include "Rendering/Shadow/DirectionalShadowRuntime.h"
+
+#include "Rendering/Execution/CameraFramePlan.h"
+#include "Rendering/Shadow/DirectionalShadowData.h"
+
+namespace XCEngine {
+namespace Rendering {
+
+bool DirectionalShadowRuntime::ResolveExecutionState(
+    const CameraFramePlan& plan,
+    DirectionalShadowExecutionState& outShadowState) {
+    outShadowState = {};
+    outShadowState.shadowCasterRequest = plan.shadowCaster;
+
+    if (outShadowState.shadowCasterRequest.IsRequested()) {
+        return outShadowState.shadowCasterRequest.IsValid();
+    }
+
+    if (!plan.directionalShadow.IsValid()) {
+        return true;
+    }
+
+    const DirectionalShadowSurfaceAllocation* shadowAllocation =
+        m_surfaceCache.Resolve(plan.request.context, plan.directionalShadow);
+    if (shadowAllocation == nullptr || !shadowAllocation->IsValid()) {
+        return false;
+    }
+
+    outShadowState.shadowCasterRequest.surface = shadowAllocation->surface;
+    outShadowState.shadowCasterRequest.clearFlags = RenderClearFlags::Depth;
+    if (!outShadowState.shadowCasterRequest.hasCameraDataOverride) {
+        outShadowState.shadowCasterRequest.hasCameraDataOverride = true;
+        outShadowState.shadowCasterRequest.cameraDataOverride = plan.directionalShadow.cameraData;
+    }
+
+    outShadowState.shadowData =
+        BuildRenderDirectionalShadowData(
+            plan.directionalShadow,
+            shadowAllocation->depthShaderView);
+    return true;
+}
+
+} // namespace Rendering
+} // namespace XCEngine
--- a/tests/Rendering/unit/test_render_scene_extractor.cpp
+++ b/tests/Rendering/unit/test_render_scene_extractor.cpp
@@ -12,7 +12,7 @@
 #include <XCEngine/Core/Math/Bounds.h>
 #include <XCEngine/Core/Math/Quaternion.h>
 #include <XCEngine/Core/Math/Vector3.h>
-#include <XCEngine/Rendering/Builtin/BuiltinPassContract.h>
+#include <XCEngine/Rendering/Builtin/BuiltinPassLayoutUtils.h>
 #include <XCEngine/Rendering/Materials/RenderMaterialResolve.h>
 #include <XCEngine/Rendering/Materials/RenderMaterialStateUtils.h>
 #include <XCEngine/Rendering/Extraction/RenderSceneExtractor.h>