textureQueryLod - OpenGL 4 Reference Pages

## Name

textureQueryLod — compute the level-of-detail that would be used to sample from a texture

## Declaration

`vec2 textureQueryLod(` | gsampler1D sampler,
| float P`)`;

`vec2 textureQueryLod(` | gsampler2D sampler,
| vec2 P`)`;

`vec2 textureQueryLod(` | gsampler3D sampler,
| vec3 P`)`;

`vec2 textureQueryLod(` | gsamplerCube sampler,
| vec3 P`)`;

`vec2 textureQueryLod(` | gsampler1DArray sampler,
| float P`)`;

`vec2 textureQueryLod(` | gsampler2DDArray sampler,
| vec2 P`)`;

`vec2 textureQueryLod(` | gsamplerCubeArray sampler,
| vec3 P`)`;

`vec2 textureQueryLod(` | gsampler1DShadow sampler,
| float P`)`;

`vec2 textureQueryLod(` | gsampler2DShadow sampler,
| vec2 P`)`;

`vec2 textureQueryLod(` | gsamplerCubeShadow sampler,
| vec3 P`)`;

`vec2 textureQueryLod(` | gsampler1DArrayShadow sampler,
| float P`)`;

`vec2 textureQueryLod(` | gsampler2DArrayShadow sampler,
| vec2 P`)`;

`vec2 textureQueryLod(` | gsamplerCubeArrayShadow sampler,
| vec3 P`)`;

## Parameters

`sampler`

  Specifies the sampler to which the texture whose level-of-detail will be queried is bound.

`P`

  Specifies the texture coordinates at which the level-of-detail will be queried.

## Description

Available only in the fragment shader, `textureQueryLod` computes the level-of-detail that would be used to sample from a texture. The mipmap array(s) that would be accessed is returned in the x component of the return value. The computed level-of-detail relative to the base level is returned in the y component of the return value.

If called on an incomplete texture, the result of the operation is undefined.

## Version Support

| OpenGL Shading Language Version
--- | ---
Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50
textureQueryLod | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## See Also

texelFetch, texelFetchOffset, texture, textureGather, textureGatherOffset, textureGatherOffsets, textureGrad, textureGradOffset, textureLod, textureLodOffset, textureOffset, textureProj, textureProjGrad, textureProjGradOffset, textureProjLod, textureProjLodOffset, textureProjOffset, textureSize

## Copyright

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.