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# docs.GL

GLSL 4
GLSL ES 3

# textureLod

## Name

textureLod — perform a texture lookup with explicit level-of-detail

## Declaration

`gvec4 textureLod(` | gsampler1D sampler,
| float P,
| float lod`)`;

`gvec4 textureLod(` | gsampler2D sampler,
| vec2 P,
| float lod`)`;

`gvec4 textureLod(` | gsampler3D sampler,
| vec3 P,
| float lod`)`;

`gvec4 textureLod(` | gsamplerCube sampler,
| vec3 P,
| float lod`)`;

`float textureLod(` | sampler1DShadow sampler,
| vec3 P,
| float lod`)`;

`float textureLod(` | sampler2DShadow sampler,
| vec4 P,
| float lod`)`;

`gvec4 textureLod(` | gsampler1DArray sampler,
| vec2 P,
| float lod`)`;

`gvec4 textureLod(` | gsampler2DArray sampler,
| vec3 P,
| float lod`)`;

`float textureLod(` | sampler1DArrayShadow sampler,
| vec3 P,
| float lod`)`;

`gvec4 textureLod(` | gsamplerCubeArray sampler,
| vec4 P,
| float lod`)`;

## Parameters

`sampler`

  Specifies the sampler to which the texture from which texels will be retrieved is bound.

`P`

  Specifies the texture coordinates at which texture will be sampled.

`lod`

  Specifies the explicit level-of-detail

## Description

`textureLod` performs a texture lookup at coordinate `P` from the texture bound to `sampler` with an explicit level-of-detail as specified in `lod`. `lod` specifies λ base and sets the partial derivatives as follows:

δ u δ x = 0 , δ v δ x = 0 , δ w δ x = 0 δ u δ y = 0 , δ v δ y = 0 , δ w δ y = 0

## 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
textureLod | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
textureLod (gsampler2DRect{Shadow}) | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
textureLod (gsamplerCubeArray) | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## See Also

texelFetch, texelFetchOffset, texture, textureGather, textureGatherOffset, textureGatherOffsets, textureGrad, textureGradOffset, textureLodOffset, textureOffset, textureProj, textureProjGrad, textureProjGradOffset, textureProjLod, textureProjLodOffset, textureProjOffset, textureQueryLod, 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. https://opencontent.org/openpub/.

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