## Name

textureProjOffset — perform a texture lookup with projection and offset

## Declaration

`gvec4 textureProjOffset(` | gsampler1D sampler,
| vec2 P,
| int offset,
| [float bias]`)`;

`gvec4 textureProjOffset(` | gsampler1D sampler,
| vec4 P,
| int offset,
| [float bias]`)`;

`gvec4 textureProjOffset(` | gsampler2D sampler,
| vec3 P,
| ivec2 offset,
| [float bias]`)`;

`gvec4 textureProjOffset(` | gsampler2D sampler,
| vec4 P,
| ivec2 offset,
| [float bias]`)`;

`gvec4 textureProjOffset(` | gsampler3D sampler,
| vec4 P,
| ivec3 offset,
| [float bias]`)`;

`float textureProjOffset(` | sampler1DShadow sampler,
| vec4 P,
| int offset,
| [float bias]`)`;

`float textureProjOffset(` | sampler2DShadow sampler,
| vec4 P,
| ivec2 offset,
| [float bias]`)`;

`gvec4 textureProjOffset(` | gsampler2DRect sampler,
| vec3 P,
| ivec2 offset`)`;

`gvec4 textureProjOffset(` | gsampler2DRect sampler,
| vec4 P,
| ivec2 offset`)`;

`float textureProjOffset(` | gsampler2DRectShadow sampler,
| vec4 P,
| ivec2 offset`)`;

## Parameters

`sampler`

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

`P`

  Specifies the texture coordinates at which the texture will be sampled.

`offset`

  Specifies the offset that is applied to `P` before sampling occurs.

`bias`

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

## Description

`textureProjOffset` 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 textureOffset, with the `offset` used to offset the computed texture coordinates.

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

## See Also

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