feat: CSM 级联阴影（3 级联 × 1024²，实用分割 + 纹素对齐）
- SceneRenderer::ComputeCascades：相机视锥实用分割（λ=0.6）→ 反投影 取切片角点 → 光空间 AABB 拟合 → 纹素对齐（消除相机移动时阴影边缘 闪烁）→ [0,1] 深度重映射 - Shadow pass 单 pass 渲 3 个 region，每级联 push 各自光空间 VP - Forward：UBO lightSpace[3]+cascadeSplits（视图深度选级联），Set2 三张级联图按 binding 0/1/2 采样；vertex 输出 fragViewDepth - 光源视锥剔除用最远级联（覆盖全阴影范围）；双视锥独立剔除铁律保留 - 旧单张 2048 全场景图退役；近处级联分辨率 ~128px/unit（约 2× 提升） - 编译零错误、validation 零警告、8 秒冒烟通过（10 pass 全活跃）
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@@ -12,93 +12,101 @@ namespace Engine::Passes
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{
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void ShadowPass::Register(RG::RenderGraph& rg)
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{
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// 所有渲染体都写入，不做实体级开关——castShadow 应由材质/实体
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// 数据驱动剔除，而非 pass 逻辑特判
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// 所有渲染体都写入每个级联，不做实体级开关——castShadow 应由
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// 材质/实体数据驱动剔除，而非 pass 逻辑特判。
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// （每级联独立剔除是后续优化点：shadowView 细分为 per-cascade 列表）
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rg.AddPass("Shadow", [this](RG::RenderGraphContext& ctx) {
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const vk::CommandBuffer cmd = ctx.cmd;
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vk::RenderingAttachmentInfo depthAttachment;
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depthAttachment.setImageView(ctx.View(m_ShadowMap))
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.setImageLayout(vk::ImageLayout::eDepthAttachmentOptimal)
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.setLoadOp(vk::AttachmentLoadOp::eClear)
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.setStoreOp(vk::AttachmentStoreOp::eStore)
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.setClearValue(vk::ClearValue(
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vk::ClearDepthStencilValue(1.0f, 0)));
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for (u32 c = 0; c < kMaxCascades; ++c) {
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vk::RenderingAttachmentInfo depthAttachment;
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depthAttachment.setImageView(ctx.View(m_ShadowMaps[c]))
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.setImageLayout(vk::ImageLayout::eDepthAttachmentOptimal)
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.setLoadOp(vk::AttachmentLoadOp::eClear)
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.setStoreOp(vk::AttachmentStoreOp::eStore)
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.setClearValue(vk::ClearValue(
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vk::ClearDepthStencilValue(1.0f, 0)));
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vk::RenderingInfo renderingInfo;
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renderingInfo.setRenderArea({{0, 0}, {kShadowMapSize, kShadowMapSize}})
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.setLayerCount(1)
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.setPDepthAttachment(&depthAttachment);
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vk::RenderingInfo renderingInfo;
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renderingInfo.setRenderArea({{0, 0}, {kCascadeRes, kCascadeRes}})
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.setLayerCount(1)
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.setPDepthAttachment(&depthAttachment);
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cmd.beginRendering(renderingInfo);
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cmd.beginRendering(renderingInfo);
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std::array<vk::ShaderStageFlagBits, 2> stages = {
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vk::ShaderStageFlagBits::eVertex,
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vk::ShaderStageFlagBits::eFragment
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};
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std::array<vk::ShaderEXT, 2> shaders = {m_Gpu.shadowVert, m_Gpu.shadowFrag};
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cmd.bindShadersEXT(stages, shaders);
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std::array<vk::ShaderStageFlagBits, 2> stages = {
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vk::ShaderStageFlagBits::eVertex,
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vk::ShaderStageFlagBits::eFragment
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};
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std::array<vk::ShaderEXT, 2> shaders = {m_Gpu.shadowVert, m_Gpu.shadowFrag};
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cmd.bindShadersEXT(stages, shaders);
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// ---- 动态状态（depth-only）----
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cmd.setRasterizerDiscardEnable(VK_FALSE);
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// ---- 动态状态（depth-only）----
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cmd.setRasterizerDiscardEnable(VK_FALSE);
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cmd.setDepthTestEnable(VK_TRUE);
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cmd.setDepthWriteEnable(VK_TRUE);
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cmd.setDepthCompareOp(vk::CompareOp::eLess);
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cmd.setDepthBoundsTestEnable(VK_FALSE);
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cmd.setDepthTestEnable(VK_TRUE);
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cmd.setDepthWriteEnable(VK_TRUE);
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cmd.setDepthCompareOp(vk::CompareOp::eLess);
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cmd.setDepthBoundsTestEnable(VK_FALSE);
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cmd.setStencilTestEnable(VK_FALSE);
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// 深度 bias 压平 shadow acne（NDC 量级）
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cmd.setDepthBiasEnable(VK_TRUE);
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cmd.setDepthBias(0.0025f, 0.0f, 0.003f);
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cmd.setPolygonModeEXT(vk::PolygonMode::eFill);
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cmd.setCullMode(vk::CullModeFlagBits::eNone);
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cmd.setFrontFace(vk::FrontFace::eCounterClockwise);
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cmd.setPrimitiveTopology(vk::PrimitiveTopology::eTriangleList);
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cmd.setPrimitiveRestartEnable(VK_FALSE);
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cmd.setStencilTestEnable(VK_FALSE);
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// 深度 bias 压平 shadow acne（NDC 量级）
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cmd.setDepthBiasEnable(VK_TRUE);
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cmd.setDepthBias(0.0025f, 0.0f, 0.003f);
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cmd.setPolygonModeEXT(vk::PolygonMode::eFill);
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cmd.setCullMode(vk::CullModeFlagBits::eNone);
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cmd.setFrontFace(vk::FrontFace::eCounterClockwise);
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cmd.setPrimitiveTopology(vk::PrimitiveTopology::eTriangleList);
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cmd.setPrimitiveRestartEnable(VK_FALSE);
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auto binding = Vertex::GetBindingDescription();
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auto attributes = Vertex::GetAttributeDescriptions();
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cmd.setVertexInputEXT(binding, attributes);
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auto binding = Vertex::GetBindingDescription();
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auto attributes = Vertex::GetAttributeDescriptions();
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cmd.setVertexInputEXT(binding, attributes);
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cmd.setRasterizationSamplesEXT(vk::SampleCountFlagBits::e1);
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vk::SampleMask sampleMask = 0xFFFFFFFF;
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cmd.setSampleMaskEXT(vk::SampleCountFlagBits::e1, sampleMask);
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cmd.setAlphaToCoverageEnableEXT(VK_FALSE);
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cmd.setAlphaToOneEnableEXT(VK_FALSE);
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cmd.setRasterizationSamplesEXT(vk::SampleCountFlagBits::e1);
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vk::SampleMask sampleMask = 0xFFFFFFFF;
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cmd.setSampleMaskEXT(vk::SampleCountFlagBits::e1, sampleMask);
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cmd.setAlphaToCoverageEnableEXT(VK_FALSE);
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cmd.setAlphaToOneEnableEXT(VK_FALSE);
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vk::Viewport viewport(0.0f, 0.0f,
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static_cast<float>(kShadowMapSize),
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static_cast<float>(kShadowMapSize),
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0.0f, 1.0f);
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cmd.setViewportWithCount(viewport);
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vk::Viewport viewport(0.0f, 0.0f,
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static_cast<float>(kCascadeRes),
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static_cast<float>(kCascadeRes),
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0.0f, 1.0f);
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cmd.setViewportWithCount(viewport);
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vk::Rect2D scissor({0, 0}, {kShadowMapSize, kShadowMapSize});
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cmd.setScissorWithCount(scissor);
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vk::Rect2D scissor({0, 0}, {kCascadeRes, kCascadeRes});
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cmd.setScissorWithCount(scissor);
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// ---- 绘制：GPUDriven——与 Forward 共用实例数据，但用
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// 光源视锥剔除后的 batch（相机外实体仍投影子）----
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cmd.bindDescriptorSets(vk::PipelineBindPoint::eGraphics,
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m_Gpu.shadowLayout, 0,
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m_Gpu.uboSets[ctx.frame.frameSlot], {});
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// ---- 绘制：GPUDriven——与 Forward 共用实例数据，但用
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// 光源视锥剔除后的 batch（相机外实体仍投影子）----
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cmd.bindDescriptorSets(vk::PipelineBindPoint::eGraphics,
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m_Gpu.shadowLayout, 0,
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m_Gpu.uboSets[ctx.frame.frameSlot], {});
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// stage 必须覆盖 layout range 声明的全部 stage（VUID-01796）
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cmd.pushConstants(m_Gpu.shadowLayout,
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vk::ShaderStageFlagBits::eVertex |
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vk::ShaderStageFlagBits::eFragment,
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0, sizeof(glm::mat4), &m_Frame.ubo.lightSpace);
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// stage 必须覆盖 layout range 声明的全部 stage（VUID-01796）
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// 每级联 push 各自的光空间 VP
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cmd.pushConstants(m_Gpu.shadowLayout,
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vk::ShaderStageFlagBits::eVertex |
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vk::ShaderStageFlagBits::eFragment,
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0, sizeof(glm::mat4),
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&m_Frame.ubo.lightSpace[c]);
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for (const auto& batch : m_Frame.shadowView.batches) {
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batch.mesh->Draw(cmd, batch.count, batch.first);
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for (const auto& batch : m_Frame.shadowView.batches) {
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batch.mesh->Draw(cmd, batch.count, batch.first);
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}
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cmd.endRendering();
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}
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cmd.endRendering();
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}).Write(m_ShadowMap, RG::ResourceUse::DepthAttachment);
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})
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.Write(m_ShadowMaps[0], RG::ResourceUse::DepthAttachment)
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.Write(m_ShadowMaps[1], RG::ResourceUse::DepthAttachment)
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.Write(m_ShadowMaps[2], RG::ResourceUse::DepthAttachment);
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}
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void ShadowPass::OnTargetsRebuilt(RG::RenderGraph& rg)
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{
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m_Gpu.BindShadowMap(rg, m_ShadowMap);
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m_Gpu.BindShadowMaps(rg, m_ShadowMaps);
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}
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} // namespace Engine::Passes
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