atdunbg
0ed7b4c5b8
- 场景剔除从 [主|阴影] 两视图扩展为 [主|级联0|级联1|级联2] 四视图： 每级联只画自己盒内的 batch，消除原先 3× 全量阴影 draw 的浪费 - 实例数组拼接为四段，batch.first 加段基址保持段内连续； ViewScratch 分桶收集复用容量，稳态零堆分配 - ComputeCascades 沿光方向扩展级联深度范围（pad=30）——切片盒外 caster（高树/城墙）投影进级联的影子不会被剔除裁掉，per-cascade 剔除正确性的前提；只扩 z 不缩 XY，分辨率不受影响 - 遥测 shadow 计数 = 各级联求和 - SunTemple 1056 mesh 全量加载，validation 零警告
113 lines
5.0 KiB
C++
113 lines
5.0 KiB
C++
//
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// Created by atdunbg on 2026/9/23.
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//
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#include <Engine/Renderer/Passes/ShadowPass.h>
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#include <Engine/Renderer/Vertex.h>
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#include <Engine/Renderer/Mesh.h>
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#include <array>
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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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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}, {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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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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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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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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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}, {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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// 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.shadowCascades[c].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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})
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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.BindShadowMaps(rg, m_ShadowMaps);
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}
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} // namespace Engine::Passes
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