一、为什么从Vulkan转向D3D12中期项目基于Vulkan通过vulkan-1.dllProxy DLL注入拦截vkGetDeviceProcAddr在vkQueuePresentKHR前插入图像处理。经过评估最终项目转向D3D12方案原因维度VulkanD3D12游戏覆盖部分更广泛超分SDKFSR2较好DLSS有限DLSS/FSR/XeSS全支持开源参考较少upscalerBridge完整参考核心洞察虽然API不同但注入思想相同——在Present前插入自定义GPU处理。区别在于实现手段。二、Vulkan方案回顾中期Vulkan通过拦截vkGetDeviceProcAddr控制所有设备级函数cpp// vk_dispatch.cpp真实代码 PFN_vkVoidFunction VKAPI_CALL VkDispatch::WrappedGetDeviceProcAddr(VkDevice device, const char* pName) { if (strcmp(pName, vkQueuePresentKHR) 0) return (PFN_vkVoidFunction)VkHooks::vkQueuePresentKHR; if (strcmp(pName, vkCreateSwapchainKHR) 0) return (PFN_vkVoidFunction)VkHooks::vkCreateSwapchainKHR; return g_vkGetDeviceProcAddr(device, pName); }注入点在vkQueuePresentKHR解析VkPresentInfoKHR获取swapchain/imageIndex录制CommandBuffer清屏或Blit通过Semaphore串联同步后调用真实Present。三、D3D12核心实现3.1 多马甲注入与Vulkan仅伪装vulkan-1.dll不同D3D12支持多个系统DLL伪装cpp// dllmain.cpp CheckWorkingMode()真实代码 if (lCaseFilename dxgi.dll) { originalModule LoadSystemDLL(Ldxgi.dll); DxgiProxy::Init(originalModule); State::Instance().workingMode WorkingMode::Dxgi; } if (lCaseFilename winmm.dll) { /* 类似 */ } if (lCaseFilename version.dll) { /* 类似 */ }3.2 LoadLibrary重定向cpp// LibraryLoad_Hooks.cpp真实代码 HMODULE LibraryLoadHooks::LoadLibraryCheckW(std::wstring libName, ...) { if (CheckDllNameW(libName, nvngxNamesW)) { LOG_INFO(nvngx call, returning this dll!); return dllModule; // 游戏以为加载了nvngx.dll实际是我们 } // 其余DLL透传 return nullptr; }3.3 DXGI Factory Hookcpp// Dxgi_Hooks.cpp真实代码 VALIDATE_HOOK(hkCreateDXGIFactory2, DxgiProxy::PFN_CreateDxgiFactory2) inline static HRESULT hkCreateDXGIFactory2(UINT Flags, REFIID riid, IDXGIFactory2** ppFactory) { HRESULT result o_CreateDXGIFactory2(Flags, riid, ppFactory); if (result S_OK) { // 包装Factory拦截所有SwapChain创建 *ppFactory (IDXGIFactory2*)(new WrappedIDXGIFactory7(*ppFactory)); } return result; }3.4 Present注入cpp// wrapped_swapchain.cpp真实代码 HRESULT WrappedIDXGISwapChain4::Present(UINT SyncInterval, UINT Flags) { if ((Flags DXGI_PRESENT_TEST) 0) { // LocalPresentImGui覆盖层 帧生成 原始Present return LocalPresent(_real, SyncInterval, Flags, ...); } return _real-Present(SyncInterval, Flags); }3.5 状态恢复关键难点D3D12注入最复杂的部分插入GPU命令后必须恢复游戏原始状态否则闪退/花屏。cpp// D3D12_Hooks.cpp真实代码 void D3D12Hooks::RestoreRoot(ID3D12GraphicsCommandList* cmdList) { // 恢复描述符堆、管线状态、根签名及所有根参数 RestoreDescriptorHeaps(cmdList); RestorePipelineState(cmdList); RestoreComputeRootState(cmdList); RestoreGraphicsRootState(cmdList); }四、与Vulkan方案对比维度VulkanD3D12拦截目标vkGetDeviceProcAddrCreateDXGIFactory→Present资源跟踪VkSwapchainKHR查表IDXGISwapChain包装同步机制VkSemaphoreD3D12 Fence状态管理自动手动追踪恢复五、验证结果text[Loader] Real dxgi.dll loaded [Hook] CreateDXGIFactory2 intercepted [Hook] WrappedIDXGISwapChain4 created [Present] ImGui overlay rendered, frame120程序正常运行ImGui覆盖层显示证明注入成功。下一篇SwapChain包装与Present注入详解
