textureProjGradOffset - OpenGL ES 3.2 Reference Pages

## Name

textureProjGradOffset — perform a texture lookup with projection, explicit gradients and offset

## Declaration

`gvec4 textureProjGradOffset(` | gsampler2D sampler,
| vec3 P,
| vec2 dPdx,
| vec2 dPdy,
| ivec2 offset`)`;

`gvec4 textureProjGradOffset(` | gsampler2D sampler,
| vec4 P,
| vec2 dPdx,
| vec2 dPdy,
| ivec2 offset`)`;

`gvec4 textureProjGradOffset(` | gsampler3D sampler,
| vec4 P,
| vec3 dPdx,
| vec3 dPdy,
| ivec3 offset`)`;

`float textureProjGradOffset(` | sampler2DShadow sampler,
| vec4 P,
| vec2 dPdx,
| vec2 dPdy,
| 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 texture will be sampled.

`dPdx`

  Specifies the partial derivative of `P` with respect to window x.

`dPdy`

  Specifies the partial derivative of `P` with respect to window y.

`offset`

  Specifies the offsets, in texels at which the texture will be sampled relative to the projection of `P`.

## Description

`textureProjGradOffset` performs a texture lookup with projection and explicit gradients and offsets. 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 textureGradOffset, passing `dPdx` and `dPdy` as gradients, and `offset` as the offset.

## Version Support

| OpenGL ES Shading Language Version
--- | ---
Function Name | 1.00 | 3.00 | 3.10 | 3.20
textureProjGradOffset | - | ✔ | ✔ | ✔

## See Also

texelFetch, texelFetchOffset, texture, textureGrad, textureGradOffset, textureLod, textureLodOffset, textureOffset, textureProj, textureProjGrad, textureProjLod, textureProjLodOffset, textureProjOffset, textureSize

## Copyright

Copyright © 2011-2015 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/.