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# docs.GL

GLSL 4
GLSL ES 3

# textureProj

## Name

textureProj — perform a texture lookup with projection

## Declaration

`gvec4 textureProj(` | gsampler1D sampler,
| vec2 P,
| [float bias]`)`;

`gvec4 textureProj(` | gsampler1D sampler,
| vec4 P,
| [float bias]`)`;

`gvec4 textureProj(` | gsampler2D sampler,
| vec3 P,
| [float bias]`)`;

`gvec4 textureProj(` | gsampler2D sampler,
| vec4 P,
| [float bias]`)`;

`gvec4 textureProj(` | gsampler3D sampler,
| vec4 P,
| [float bias]`)`;

`float textureProj(` | sampler1DShadow sampler,
| vec4 P,
| [float bias]`)`;

`float textureProj(` | sampler2DShadow sampler,
| vec4 P,
| [float bias]`)`;

`gvec4 textureProj(` | gsampler2DRect sampler,
| vec3 P`)`;

`gvec4 textureProj(` | gsampler2DRect sampler,
| vec4 P`)`;

`float textureProj(` | gsampler2DRectShadow sampler,
| vec4 P`)`;

## 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.

`bias`

  Specifies an optional bias to be applied during level-of-detail computation.

## Description

`textureProj` performs a texture lookup with projection. The texture coordinates consumed from `P`, not including the last component of `P`, are divided by the last component of `P`. The resulting 3 rd component of `P` in the shadow forms is used as D ref. After these values are computed, the texture lookup proceeds as in texture.

## 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
textureProj | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
textureProj (gsampler2DRect{Shadow}) | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## See Also

texelFetch, texelFetchOffset, texture, textureGather, textureGatherOffset, textureGatherOffsets, textureGrad, textureGradOffset, textureLod, textureLodOffset, textureOffset, 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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