atdunbg
b76922824c
透明来源：glTF alphaMode=BLEND（解析期读取，OBJ/FBX 恒不透明—— 资产格式定义写死）；MASK 后续演进。Material 加透明语义（入缓存键）， 程序化测试资产 CreateTransparentPlane（RGBA 纯色纹理）。 SceneRenderer：透明材质实例收集进独立 scratch（仅主视图，不投 阴影——alpha 阴影后续演进），batch 按平均距离降序排序（远→近， batchMats 同步重排），SSBO 扁平化顺序 = 排序后顺序。 ForwardPass 两段绘制：不透明（无混合 + 深度写）→ 透明（Shader Object 动态状态切 SRC_ALPHA/ONE_MINUS_SRC_ALPHA 线性 over + 深度 只测不写）；velocity 附件透明段直写（透明表面 velocity 即自身运动）。 frag alpha = albedo 贴图 a 直通，预乘在 tonemap 段（hard constraint 不变）。已知边界：TAA alpha 时域混合（透明边缘几帧渐显）；同 batch 多实例不做实例级排序。
187 lines
9.0 KiB
C++
187 lines
9.0 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/ForwardPass.h>
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#include <Engine/Renderer/Vertex.h>
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#include <Engine/Renderer/Mesh.h>
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#include <Engine/Renderer/Material.h>
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#include <array>
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#include <span>
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namespace Engine::Passes
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{
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void ForwardPass::Register(RG::RenderGraph& rg)
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{
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rg.AddPass("Forward", [this](RG::RenderGraphContext& ctx) {
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const vk::CommandBuffer cmd = ctx.cmd;
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vk::ClearValue clearValue;
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clearValue.color = vk::ClearColorValue(
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std::array<float, 4>{0.1f, 0.1f, 0.1f, 0.0f});
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vk::RenderingAttachmentInfo colorAttachments[2];
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// HDR 附件由 Skybox pass 清屏并画背景，这里 Load 在其上合成几何
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colorAttachments[0].setImageView(ctx.View(m_HDRColor))
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.setImageLayout(vk::ImageLayout::eColorAttachmentOptimal)
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.setLoadOp(vk::AttachmentLoadOp::eLoad)
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.setStoreOp(vk::AttachmentStoreOp::eStore)
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.setClearValue(clearValue);
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// velocity 附件：清 0 = 静止（背景无几何 → 历史原位采样）
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vk::ClearValue velocityClear;
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velocityClear.color = vk::ClearColorValue(std::array<float, 4>{0.f, 0.f, 0.f, 0.f});
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colorAttachments[1].setImageView(ctx.View(m_Velocity))
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.setImageLayout(vk::ImageLayout::eColorAttachmentOptimal)
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.setLoadOp(vk::AttachmentLoadOp::eClear)
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.setStoreOp(vk::AttachmentStoreOp::eStore)
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.setClearValue(velocityClear);
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vk::RenderingAttachmentInfo depthAttachment;
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depthAttachment.setImageView(ctx.View(m_Depth))
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.setImageLayout(vk::ImageLayout::eDepthAttachmentOptimal)
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.setLoadOp(vk::AttachmentLoadOp::eClear)
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.setStoreOp(vk::AttachmentStoreOp::eDontCare)
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.setClearValue(vk::ClearValue(
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vk::ClearDepthStencilValue(1.0f, 0)));
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std::array<vk::RenderingAttachmentInfo, 2> colorArray = {
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colorAttachments[0], colorAttachments[1]};
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vk::RenderingInfo renderingInfo;
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renderingInfo.setRenderArea({{0, 0}, ctx.extent})
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.setLayerCount(1)
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.setColorAttachments(colorArray)
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.setPDepthAttachment(&depthAttachment);
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cmd.beginRendering(renderingInfo);
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// 绑定 shader object
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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.forwardVert, m_Gpu.forwardFrag};
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cmd.bindShadersEXT(stages, shaders);
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// Set 0：本帧槽位的 UBO；Set 2：本帧槽位的阴影图
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cmd.bindDescriptorSets(vk::PipelineBindPoint::eGraphics,
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m_Gpu.forwardLayout, 0,
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m_Gpu.uboSets[ctx.frame.frameSlot], {});
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cmd.bindDescriptorSets(vk::PipelineBindPoint::eGraphics,
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m_Gpu.forwardLayout, 2,
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m_Gpu.shadowSets[ctx.frame.frameSlot], {});
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// ---- 动态状态 ----
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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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cmd.setDepthBiasEnable(VK_FALSE);
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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>(ctx.extent.width),
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static_cast<float>(ctx.extent.height),
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0.0f, 1.0f);
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cmd.setViewportWithCount(viewport);
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vk::Rect2D scissor({0, 0}, ctx.extent);
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cmd.setScissorWithCount(scissor);
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vk::Bool32 blendEnable = VK_FALSE;
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vk::ColorBlendEquationEXT blendEquation;
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blendEquation.setSrcColorBlendFactor(vk::BlendFactor::eOne)
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.setDstColorBlendFactor(vk::BlendFactor::eZero)
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.setColorBlendOp(vk::BlendOp::eAdd)
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.setSrcAlphaBlendFactor(vk::BlendFactor::eOne)
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.setDstAlphaBlendFactor(vk::BlendFactor::eZero)
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.setAlphaBlendOp(vk::BlendOp::eAdd);
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vk::ColorComponentFlags colorWriteMask =
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vk::ColorComponentFlagBits::eR |
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vk::ColorComponentFlagBits::eG |
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vk::ColorComponentFlagBits::eB |
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vk::ColorComponentFlagBits::eA;
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// 两个颜色附件（HDR + velocity）都是无混合直写
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cmd.setColorBlendEnableEXT(0,
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std::array<vk::Bool32, 2>{blendEnable, blendEnable});
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cmd.setColorBlendEquationEXT(0,
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std::array<vk::ColorBlendEquationEXT, 2>{blendEquation, blendEquation});
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cmd.setColorWriteMaskEXT(0,
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std::array<vk::ColorComponentFlags, 2>{colorWriteMask, colorWriteMask});
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// ---- 不透明批次：无混合直写，深度测试 + 写 ----
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for (const auto& batch : m_Frame.mainView.batches) {
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cmd.bindDescriptorSets(vk::PipelineBindPoint::eGraphics,
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m_Gpu.forwardLayout, 1,
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batch.mesh->GetMaterial()->GetDescriptorSet(), {});
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batch.mesh->Draw(cmd, batch.count, batch.first, batch.lod);
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}
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// ---- 透明批次：预乘 alpha 混合（线性空间 over），深度只测
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// 不写，远 → 近排序（SceneRenderer 侧已按 batch 平均距离排）。
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// 附件 0（HDR）混合、附件 1（velocity）直写——透明表面的
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// velocity 就是它自身的运动，覆盖自己的像素即正确。
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// alpha 语义：frag 输出未预乘线性色 + 覆盖率 alpha，
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// 预乘在 tonemap 段（rgb * a）完成 —— hard constraint。
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if (!m_Frame.translucentView.batches.empty()) {
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vk::ColorBlendEquationEXT premul;
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premul.setSrcColorBlendFactor(vk::BlendFactor::eSrcAlpha)
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.setDstColorBlendFactor(vk::BlendFactor::eOneMinusSrcAlpha)
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.setColorBlendOp(vk::BlendOp::eAdd)
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.setSrcAlphaBlendFactor(vk::BlendFactor::eOne)
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.setDstAlphaBlendFactor(vk::BlendFactor::eOneMinusSrcAlpha)
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.setAlphaBlendOp(vk::BlendOp::eAdd);
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cmd.setColorBlendEnableEXT(0,
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std::array<vk::Bool32, 2>{VK_TRUE, VK_FALSE});
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cmd.setColorBlendEquationEXT(0,
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std::array<vk::ColorBlendEquationEXT, 2>{premul, blendEquation});
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cmd.setDepthWriteEnableEXT(VK_FALSE);
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for (const auto& batch : m_Frame.translucentView.batches) {
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cmd.bindDescriptorSets(vk::PipelineBindPoint::eGraphics,
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m_Gpu.forwardLayout, 1,
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batch.mesh->GetMaterial()->GetDescriptorSet(), {});
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batch.mesh->Draw(cmd, batch.count, batch.first, batch.lod);
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}
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cmd.setDepthWriteEnableEXT(VK_TRUE); // 恢复（下帧 opaque 段也会重设）
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}
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cmd.endRendering();
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})
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.Write(m_HDRColor, RG::ResourceUse::ColorAttachment)
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.Write(m_Velocity, RG::ResourceUse::ColorAttachment)
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.Write(m_Depth, RG::ResourceUse::DepthAttachment)
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.Read(m_ShadowMaps[0], RG::ResourceUse::ShaderRead,
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vk::ShaderStageFlagBits::eFragment)
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.Read(m_ShadowMaps[1], RG::ResourceUse::ShaderRead,
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vk::ShaderStageFlagBits::eFragment)
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.Read(m_ShadowMaps[2], RG::ResourceUse::ShaderRead,
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vk::ShaderStageFlagBits::eFragment);
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}
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} // namespace Engine::Passes
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