texelFetchOffset — perform a lookup of a single texel within a texture with an offset
gvec4 texelFetchOffset( | gsampler1D sampler, |
| int P, | |
| int lod, | |
int offset); |
gvec4 texelFetchOffset( | gsampler2D sampler, |
| ivec2 P, | |
| int lod, | |
int offset); |
gvec4 texelFetchOffset( | gsampler3D sampler, |
| ivec3 P, | |
| int lod, | |
int offset); |
gvec4 texelFetchOffset( | gsampler2DRect sampler, |
| ivec2 P, | |
int offset); |
gvec4 texelFetchOffset( | gsampler1DArray sampler, |
| ivec2 P, | |
| int lod, | |
int offset); |
gvec4 texelFetchOffset( | gsampler2DArray sampler, |
| ivec3 P, | |
| int lod, | |
int offset); |
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 If present, specifies the level-of-detail within the texture from which the texel will be fetched.
offset Specifies offset, in texels that will be applied to P before looking up the texel.
texelFetchOffset performs a lookup of a single texel from texture coordinate P in the texture bound to sampler. Before fetching the texel, the offset specified in offset is added to P. offset must be a constant expression. The array layer is specified in the last component of P for array forms. The lod parameter (if present) specifies the level-of-detail from which the texel will be fetched. The sample parameter specifies which sample within the texel will be returned when reading from a multi-sample texure.
| 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 |
| texelFetchOffset | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| texelFetchOffset (gsampler2DRect) | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| texelFetchOffset (gsampler2DMS, gsampler2DMSArray) | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
texelFetch, texture, textureGather, textureGatherOffset, textureGatherOffsets, textureGrad, textureGradOffset, textureLod, textureLodOffset, textureOffset, textureProj, textureProjGrad, textureProjGradOffset, textureProjLod, textureProjLodOffset, textureProjOffset, textureQueryLod, textureSize
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/.