D3D12¶

Early Z-Test¶

由图形驱动控制，不能用 D3D API 控制。如果像素着色器会修改深度（SV_Depth），就不能应用 Early Z-Test。参考 DX12 龙书第 400 页。

Shader 中越界访问¶

D3D11 中，Shader 越界读写没有问题，越界读会返回 0。¹ 但在 D3D12 中，如果资源使用的是 Root Descriptor，由于只提供了 D3D12_GPU_VIRTUAL_ADDRESS 而没有 Size，GPU 无法做越界检查，越界读写可能崩溃。如果是在 Descriptor Table 中的 Descriptor，由于创建对应 View 时在 Desc 中指定了 Size，所以越界读写行为和 D3D11 一致。²

RHI 封装¶

ring buffer¶

• ring buffer，一篇文章讲透它？在任务间的通信、串口数据收发、log缓存、网卡处理网络数据包、音频/视频流处理 - 掘金 (juejin.cn)

root signature hash¶

FNV-1a hash

• DirectX-Graphics-Samples/MiniEngine/Core/Hash.h at master · microsoft/DirectX-Graphics-Samples (github.com)
• Collision handling of PSO hash value · Issue #82 · microsoft/DirectX-Graphics-Samples (github.com)
• cpp-algorithms/src/algo/hash.cpp at master · SRombauts/cpp-algorithms (github.com)
• performance - Fast hash function with collision possibility near SHA-1 - Stack Overflow
• security - Which hashing algorithm is best for uniqueness and speed? - Software Engineering Stack Exchange

dxil 签名¶

需要把 WindowsSDK 的 dxil.dll 放到 exe 执行目录，ShaderCompiler 需要加载它然后对 dxil 签名。

• Signing DXIL Post-Compile | Graham Wihlidal

cbuffer packing¶

• Packing rules for constant variables - Win32 apps | Microsoft Learn

资源管理¶

• DX12封装杂记：Descriptor及DescriptorHeap - 知乎 (zhihu.com)
• buddy allocator
• linear allocator
• directx - DX12 Descriptor Heaps management - Stack Overflow
• 尽量少切换 DescriptorHeap
• ID3D12GraphicsCommandList::SetDescriptorHeaps (d3d12.h) - Win32 apps | Microsoft Learn
• call SetDescriptorHeaps for secondary viewport in UserCallback · Issue #7336 · ocornut/imgui (github.com)
• Descriptor Heaps Overview - Win32 apps | Microsoft Learn

debug message¶

• D3D12 ID3D12InfoQueue1 APIs | DirectX-Specs (microsoft.github.io)
• D3D12 Debug Layer Message Callback - DirectX Developer Blog (microsoft.com)

windows 上 resize 窗口不会绘制的问题¶

• c++ - Window message WM_SIZING sending incessantly when window resizing - Stack Overflow
• direct3d12 - Why are the D3D12 samples using WM_PAINT? - Stack Overflow
• WM_PAINT message (Winuser.h) - Win32 apps | Microsoft Learn
• Resizing windows on Windows 10 shows jumpy behaviour · Issue #1231 · glfw/glfw (github.com)
• Win32 API: PeekMessage blocks main loop on window resize : r/C_Programming (reddit.com)
• WM_SIZE 消息 (Winuser.h) - Win32 apps | Microsoft Learn