Partilhar via

Point, Bilinear, Trilinear, and Anisotropic Texture Filtering Variants

  • Artigo

Note

This article applies to Visual Studio 2015. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

Overrides the filtering mode on appropriate texture samplers.

Interpretation

Different methods of texture sampling have different performance costs and image quality. In order of increasing cost—and increasing visual quality—the filter modes are:

  1. Point filtering (least expensive, worst visual quality)

  2. Bilinear filtering

  3. Trilinear filtering

  4. Anisotropic filtering (most expensive, best visual quality)

    If the performance cost of each variant is significant or increases with more-intensive filtering modes, you can weigh its cost against its increased image quality. Based on your assessment, you might accept additional performance costs to increase visual quality, or you might accept decreased visual quality to achieve a higher frame-rate or to reclaim performance that you can use in other ways.

    If you find that performance cost is negligible or steady regardless of the filtering mode—for example, when the GPU that you're targeting has an abundance of shader throughput and memory bandwidth—consider using anisotropic filtering to achieve the best image quality in your app.

Remarks

These variants override the sampler states on calls to ID3D11DeviceContext::PSSetSamplers in which the application-provided sampler's filter mode is one of these:

  • D3D11_FILTER_MIN_MAG_MIP_POINT

  • D3D11_FILTER_MIN_MAG_POINT_MIP_LINEAR

  • D3D11_FILTER_MIN_POINT_MAG_LINEAR_MIP_POINT

  • D3D11_FILTER_MIN_POINT_MAG_MIP_LINEAR

  • D3D11_FILTER_MIN_LINEAR_MAG_MIP_POINT

  • D3D11_FILTER_MIN_LINEAR_MAG_POINT_MIP_LINEAR

  • D3D11_FILTER_MIN_MAG_LINEAR_MIP_POINT

  • D3D11_FILTER_MIN_MAG_MIP_LINEAR

  • D3D11_FILTER_ANISOTROPIC

    In the Point Texture Filtering variant, the application-provided filter mode is replaced with D3D11_FILTER_MIN_MAG_MIP_POINT; in the Bilinear Texture Filtering variant, it's replaced with D3D11_FILTER_MIN_MAG_LINEAR_MIP_POINT; and in the Trilinear Texture Filtering variant, it's replaced with D3D11_FILTER_MIN_MAG_MIP_LINEAR.

    In the Anisotropic Texture Filtering variant, the application-provided filter mode is replaced with D3D11_FILTER_ANISOTROPIC, and the Max Anisotropy is set to 16.

Restrictions and limitations

In Direct3D, feature level 9.1 specifies a maximum anisotropy of 2x. Because the Anisotropic Texture Filtering variant attempts to use 16x anisotropy exclusively, playback fails when frame analysis is run on a feature-level 9.1 device. Contemporary devices that are affected by this limitation include the ARM-based Surface RT and Surface 2 Windows tablets. Older GPUs that might still be found in some computers can also be affected, but they're widely considered to be obsolete and are increasingly uncommon.

Example

The Point Texture Filtering variant can be reproduced by using code like this:

D3D11_SAMPLER_DESC sampler_description;  
  
// ... other sampler description setup ...  
  
sampler_description.Filter = D3D11_FILTER_MIN_MAG_MIP_POINT;  
  
d3d_device->CreateSamplerState(&sampler_desc, &sampler);  
d3d_context->PSSetSamplers(0, 1, &sampler

Example

The Bilinear Texture Filtering variant can be reproduced by using code like this:

D3D11_SAMPLER_DESC sampler_description;   
  
// ... other sampler description setup ...  
  
sampler_description.Filter = D3D11_FILTER_MIN_MAG_LINEAR_MIP_POINT;  
  
d3d_device->CreateSamplerState(&sampler_desc, &sampler);  
d3d_context->PSSetSamplers(0, 1, &sampler

Example

The Trilinear Texture Filtering variant can be reproduced by using code like this:

D3D11_SAMPLER_DESC sampler_description;   
  
// ... other sampler description setup ...  
  
sampler_description.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;  
  
d3d_device->CreateSamplerState(&sampler_desc, &sampler);  
d3d_context->PSSetSamplers(0, 1, &sampler

Example

The Anisotropic Texture Filtering variant can be reproduced by using code like this:

D3D11_SAMPLER_DESC sampler_description;   
  
// ... other sampler description setup ...  
  
sampler_description.Filter = D3D11_FILTER_ANISOTROPIC;  
sampler_description.MaxAnisotropy = 16;  
  
d3d_device->CreateSamplerState(&sampler_desc, &sampler);  
d3d_context->PSSetSamplers(0, 1, &sampler