Question

我有一个用c ++编写的OpenGL库，它是使用C ++ / CLI适配器从C＃应用程序中使用的。我的问题是如果应用程序用于具有Nvidia Optimus技术的笔记本电脑上，应用程序将不会使用硬件加速并失败。

我尝试使用Nvidias文档http://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf中的信息关于将libs链接到我的C ++ -dll并从我的OpenGL库中导出NvOptimusEnablement但是失败了。我想我必须对.exe执行一些操作，而不是使用.dll链接到.exe

对我们来说，使用配置文件不是一个好选择，因为我们需要确保使用nvidia硬件。

C＃应用程序是否有某种方式可以强制Optimus使用Nvidia芯片组而不是集成的Intel芯片组？

Answer 1

我尝试了the swine的两个选项，但都没有自己动手。我发现我需要尝试调用导入的函数。

$sql = "INSERT INTO membre (Name, Age) VALUES (\'$Name\', \'$Age\')";
OR
$sql = "INSERT INTO membre (Name, Age) VALUES ('".$Name."', '".$Age."')";

然后在我的应用启动中：

using System.Runtime.InteropServices;

class OptimusEnabler
{
    [DllImport("nvapi.dll")]
    public static extern int NvAPI_Initialize();
};

在nVidia Optimus系统上，我得到try { ///Ignore any System.EntryPointNotFoundException ///or System.DllNotFoundException exceptions here OptimusEnabler.NvAPI_Initialize(); } catch { }，但它仍然可以使应用程序使用nVidia硬件。在带有ATI卡的系统上测试时，我得到了System.EntryPointNotFoundException。无论哪种方式，尝试调用此方法并忽略任何异常似乎都可以正常工作。

Answer 2

工作解决方案。实际上所有那些已经提到的，但我花了一些时间来了解如何让它工作......

fonts

重要 - 在创建任何窗口之前调用[System.Runtime.InteropServices.DllImport("nvapi64.dll", EntryPoint = "fake")] static extern int LoadNvApi64(); [System.Runtime.InteropServices.DllImport("nvapi.dll", EntryPoint = "fake")] static extern int LoadNvApi32(); private void InitializeDedicatedGraphics() { try { if (Environment.Is64BitProcess) LoadNvApi64(); else LoadNvApi32(); } catch { } // will always fail since 'fake' entry point doesn't exists }

Answer 3

如果您的软件在英特尔上失败，那么您将无法在50％的笔记本电脑上运行它。所以我建议修改它。

比起说，您可以通过代码完美地创建配置文件。只需使用NvAPI即可。这段代码确实如此，但要注意，您可能不应该使用全局配置文件并创建自己的配置文件：

NvAPI_Status status;
// (0) Initialize NVAPI. This must be done first of all
status = NvAPI_Initialize();
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);
// (1) Create the session handle to access driver settings
NvDRSSessionHandle hSession = 0;
status = NvAPI_DRS_CreateSession(&hSession);
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);
// (2) load all the system settings into the session
status = NvAPI_DRS_LoadSettings(hSession);
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);
// (3) Obtain the Base profile. Any setting needs to be inside
// a profile, putting a setting on the Base Profile enforces it
// for all the processes on the system
NvDRSProfileHandle hProfile = 0;
status = NvAPI_DRS_GetBaseProfile(hSession, &hProfile);
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);


NVDRS_SETTING drsSetting1 = {0};
drsSetting1.version = NVDRS_SETTING_VER;
drsSetting1.settingId = SHIM_MCCOMPAT_ID;
drsSetting1.settingType = NVDRS_DWORD_TYPE;

NVDRS_SETTING drsSetting2 = {0};
drsSetting2.version = NVDRS_SETTING_VER;
drsSetting2.settingId = SHIM_RENDERING_MODE_ID;
drsSetting2.settingType = NVDRS_DWORD_TYPE;

NVDRS_SETTING drsSetting3 = {0};
drsSetting3.version = NVDRS_SETTING_VER;
drsSetting3.settingId = SHIM_RENDERING_OPTIONS_ID;
drsSetting3.settingType = NVDRS_DWORD_TYPE;

if( ForceIntegrated ){
    drsSetting1.u32CurrentValue = SHIM_MCCOMPAT_INTEGRATED;
    drsSetting2.u32CurrentValue = SHIM_RENDERING_MODE_INTEGRATED;
    drsSetting3.u32CurrentValue = SHIM_RENDERING_OPTIONS_DEFAULT_RENDERING_MODE | SHIM_RENDERING_OPTIONS_IGPU_TRANSCODING;
}else{
    drsSetting1.u32CurrentValue = SHIM_MCCOMPAT_ENABLE;
    drsSetting2.u32CurrentValue = SHIM_RENDERING_MODE_ENABLE;
    drsSetting3.u32CurrentValue = SHIM_RENDERING_OPTIONS_DEFAULT_RENDERING_MODE;
}



status = NvAPI_DRS_SetSetting(hSession, hProfile, &drsSetting1);
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);

status = NvAPI_DRS_SetSetting(hSession, hProfile, &drsSetting2);
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);

status = NvAPI_DRS_SetSetting(hSession, hProfile, &drsSetting3);
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);

// (5) Now we apply (or save) our changes to the system
status = NvAPI_DRS_SaveSettings(hSession);
if (status != NVAPI_OK) 
    PrintError(status, __LINE__);
// (6) We clean up. This is analogous to doing a free()
NvAPI_DRS_DestroySession(hSession);
hSession = 0;

启动时，测试您的个人资料是否存在。如果没有，创建它（你可能也必须重新启动）。 NvAPI是一个静态库，可以在非NVIDIA硬件上正常返回错误代码，因此您可以安全地发送它。

编辑：看起来有一种更简单的方法。来自GLFW 3源代码：

// Applications exporting this symbol with this value will be automatically
// directed to the high-performance GPU on nVidia Optimus systems
//
GLFWAPI DWORD NvOptimusEnablement = 0x00000001;

Answer 4

我的解决方案基于导出的功能NvOptimusEnablement和AmdPowerXpressRequestHighPerformance，在没有DllExport（没有NuGet软件包UnmanagedExports）的情况下，可在NVidia和AMD上运行：

在VS2019上，上述的UnmanagedExports软件包似乎无法正常工作。我找不到另一个提供DllExport功能的.NET框架工作包。这就是为什么我在Writing IL code on Visual Studio和IL Support的大力帮助下使用直接MSIL代码开发了自己的解决方案的原因。

要遵循的步骤：

为您的exe选择x86或x64平台（不能通过AnyCPU设置来实现）

要向.csproj文件（用于exe的.csproj，不适用于任何dll），请添加以下部分，以便直接使用MSIL代码（通常可以将其放在任何位置，即）。对于高于4.6.2的.net框架，您可能需要更新ildasm.exe的路径：

<PropertyGroup>
  <CoreCompileDependsOn>
    HideILFromCoreCompile;
    $(CoreCompileDependsOn);
  </CoreCompileDependsOn>
  <CompileDependsOn>
    HideILFromCompile;
    $(CompileDependsOn);
    InitializeIL;
    CoreDecompile;
    CoreCompileIL;
  </CompileDependsOn>
</PropertyGroup>
<Target Name="HideILFromCoreCompile">
  <ItemGroup>
    <Compile Remove="@(Compile)" Condition="'%(Extension)'=='.il'" />
  </ItemGroup>
</Target>
<Target Name="HideILFromCompile">
  <ItemGroup>
    <IL Include="@(Compile)" Condition="'%(Extension)'=='.il'" />
    <Compile Remove="@(Compile)" Condition="'%(Extension)'=='.il'" />
  </ItemGroup>
</Target>
<Target Name="InitializeIL">
  <PropertyGroup>
    <ILFile>@(IntermediateAssembly->'%(RootDir)%(Directory)%(Filename).il', ' ')</ILFile>
    <ILResourceFile>@(IntermediateAssembly->'%(RootDir)%(Directory)%(Filename).res', ' ')</ILResourceFile>
  </PropertyGroup>
</Target>
<Target Name="CoreDecompile" Inputs="@(IntermediateAssembly)" Outputs="$(ILFile)" Condition=" Exists ( @(IntermediateAssembly) ) ">
  <GetFrameworkSdkPath>
    <Output TaskParameter="Path" PropertyName="FrameworkSdkPath" />
  </GetFrameworkSdkPath>
  <PropertyGroup>
    <ILDasm>"$(FrameworkSdkPath)bin\ildasm.exe" /nobar /linenum /output:"$(ILFile)" @(IntermediateAssembly->'"%(FullPath)"', ' ')</ILDasm>
  </PropertyGroup>
  <PropertyGroup Condition=" Exists ( '$(FrameworkSdkPath)bin\NETFX 4.0 Tools\ildasm.exe' ) ">
    <ILDasm>"$(FrameworkSdkPath)bin\NETFX 4.0 Tools\ildasm.exe" /nobar /linenum /output:"$(ILFile)" @(IntermediateAssembly->'"%(FullPath)"', ' ')</ILDasm>
  </PropertyGroup>
  <PropertyGroup Condition=" Exists ( '$(FrameworkSdkPath)bin\NETFX 4.5.1 Tools\ildasm.exe' ) ">
    <ILDasm>"$(FrameworkSdkPath)bin\NETFX 4.5.1 Tools\ildasm.exe" /nobar /linenum /output:"$(ILFile)" @(IntermediateAssembly->'"%(FullPath)"', ' ')</ILDasm>
  </PropertyGroup>
  <PropertyGroup Condition=" Exists ( '$(FrameworkSdkPath)bin\NETFX 4.6 Tools\ildasm.exe' ) ">
    <ILDasm>"$(FrameworkSdkPath)bin\NETFX 4.6 Tools\ildasm.exe" /nobar /linenum /output:"$(ILFile)" @(IntermediateAssembly->'"%(FullPath)"', ' ')</ILDasm>
  </PropertyGroup>
  <PropertyGroup Condition=" Exists ( '$(FrameworkSdkPath)bin\NETFX 4.6.1 Tools\ildasm.exe' ) ">
    <ILDasm>"$(FrameworkSdkPath)bin\NETFX 4.6.1 Tools\ildasm.exe" /nobar /linenum /output:"$(ILFile)" @(IntermediateAssembly->'"%(FullPath)"', ' ')</ILDasm>
  </PropertyGroup>
  <PropertyGroup Condition=" Exists ( '$(FrameworkSdkPath)bin\NETFX 4.6.2 Tools\ildasm.exe' ) ">
    <ILDasm>"$(FrameworkSdkPath)bin\NETFX 4.6.2 Tools\ildasm.exe" /nobar /linenum /output:"$(ILFile)" @(IntermediateAssembly->'"%(FullPath)"', ' ')</ILDasm>
  </PropertyGroup>
  <Exec Command="$(ILDasm)" />
  <ItemGroup>
    <FileWrites Include="$(ILFile)" />
    <FileWrites Include="$(ILResourceFile)" />
  </ItemGroup>
  <PropertyGroup>
    <ILSource>$([System.IO.File]::ReadAllText($(ILFile)))</ILSource>
    <Replacement>// method ${method} forwardref removed for IL import</Replacement>
    <Pattern>\.method [^{}]+ cil managed forwardref[^}]+} // end of method (?&lt;method&gt;[^ \r\t\n]+)</Pattern>
    <ILSource>$([System.Text.RegularExpressions.Regex]::Replace($(ILSource), $(Pattern), $(Replacement)))</ILSource>
    <Pattern>\.method [^{}]+ cil managed[^\a]+"extern was not given a DllImport attribute"[^}]+} // end of method (?&lt;method&gt;[^ \r\t\n]+)</Pattern>
    <ILSource>$([System.Text.RegularExpressions.Regex]::Replace($(ILSource), $(Pattern), $(Replacement)))</ILSource>
  </PropertyGroup>
  <WriteLinesToFile File="$(ILFile)" Lines="$(ILSource)" Overwrite="true" />
  <PropertyGroup>
    <ILSource />
  </PropertyGroup>
  <Delete Files="@(IntermediateAssembly)" />
</Target>
<Target Name="CoreCompileIL" Inputs="@(IL)" Outputs="@(IntermediateAssembly)">
  <GetFrameworkPath>
    <Output TaskParameter="Path" PropertyName="FrameworkPath" />
  </GetFrameworkPath>
  <PropertyGroup>
    <ILAsm>"$(FrameworkPath)\ilasm.exe" /nologo /quiet /output:@(IntermediateAssembly->'"%(FullPath)"', ' ')</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(FileAlignment)' != '' ">
    <ILAsm>$(ILAsm) /alignment=$(FileAlignment)</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(BaseAddress)' != '' ">
    <ILAsm>$(ILAsm) /base=$(BaseAddress)</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(OutputType)' == 'Library' ">
    <ILAsm>$(ILAsm) /dll</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(DebugType)' == 'pdbonly' ">
    <ILAsm>$(ILAsm) /pdb</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(DebugType)' == 'full' ">
    <ILAsm>$(ILAsm) /debug</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Optimize)' == 'true' ">
    <ILAsm>$(ILAsm) /optimize</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Platform)' == 'x64' ">
    <ILAsm>$(ILAsm) /pe64 /x64</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Platform)' == 'Itanium' ">
    <ILAsm>$(ILAsm) /pe64 /itanium</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(AssemblyOriginatorKeyFile)' != '' ">
    <ILAsm>$(ILAsm) /key:"$(AssemblyOriginatorKeyFile)"</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" Exists ( '$(ILResourceFile)' ) ">
    <ILAsm>$(ILAsm) /resource:"$(ILResourceFile)"</ILAsm>
  </PropertyGroup>
  <PropertyGroup Condition=" Exists ( '$(ILFile)' ) ">
    <ILAsm>$(ILAsm) "$(ILFile)"</ILAsm>
  </PropertyGroup>
  <Exec Command="$(ILAsm) @(IL->'&quot;%(FullPath)&quot;', ' ')" />
  <ItemGroup>
    <FileWrites Include="@(IntermediateAssembly->'%(RootDir)%(Directory)DesignTimeResolveAssemblyReferencesInput.cache', ' ')" />
  </ItemGroup>
  <Touch Files="$(ILFile)" />
</Target>

将扩展名为.il的文件添加到您的项目中（例如ForceDedicatedGraphicCard.il）

将以下代码粘贴到该文件中（而不是“ WindowsApplication1”，您可以输入名称空间）：

 .class public WindowsApplication1.ForceDedicatedGraphicCard
 {
     .method public static int32 NvOptimusEnablement() cil managed
     {
         .export [1]
         ldc.i4.1
         ret
     }
     .method public static uint32 AmdPowerXpressRequestHighPerformance() cil managed
     {
         .export [2]
         ldc.i4.1
         ret
     }
 }

构建项目
检查是否使用dumpbin.exe
导出了功能
```
dumpbin.exe /exports your_project.exe
```
现在应自动选择专用的图形卡。如果没有，请检查您是否具有更新的驱动程序-旧的驱动程序不支持这些导出的功能。

Answer 5

从文件中看起来似乎很简单。你有多种选择如何做到这一点。不幸的是， exe 需要这样做，而不是dll。根据{{3}}，可能会执行以下操作：

class OptimusEnabler {
    [DllExport("NvOptimusEnablement")]
    public static int NvOptimusEnablement = 1;
};

然后需要将其包含在您的C ++库接口中，以便任何使用它的C＃应用程序都将被强制导出它。或者，您可以尝试链接nvapi.dll：

class OptimusEnabler {
    [DllImport("nvapi.dll")]
    public static extern int NvAPI_Initialize();
};

根据该文件，这也足以将您的应用程序识别为启用NV。甚至不需要调用导入的函数。

强制硬件加速渲染

5 个答案: