texelFetchOffset

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Perform a lookup of a single texel within a texture with an offset.

Declaration[edit]

gvec4 texelFetchOffset( gsampler1D sampler, int P, int lod, int offset );
gvec4 texelFetchOffset( gsampler2D sampler, ivec2 P, int lod, ivec2 offset );
gvec4 texelFetchOffset( gsampler3D sampler, ivec3 P, int lod, ivec3 offset );
gvec4 texelFetchOffset( gsampler2DRect sampler, ivec2 P, ivec2 offset );
gvec4 texelFetchOffset( gsampler1DArray sampler, ivec2 P, int lod, ivec2 offset );
gvec4 texelFetchOffset( gsampler2DArray sampler, ivec3 P, int lod, ivec3 offset );


Parameters[edit]

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.


Description[edit]

 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.


Version Support[edit]

texelFetchOffset 1.3+
texelFetchOffset (gsampler2DRect) 1.4+
texelFetchOffset (gsampler2DMS, gsampler2DMSArray) 1.5+

See Also[edit]

 texelFetch , texture , textureGather , textureGatherOffset , textureGatherOffsets , textureGrad , textureGradOffset , textureLod , textureLodOffset , textureOffset , textureProj , textureProjGrad , textureProjGradOffset , textureProjLod , textureProjLodOffset , textureProjOffset , textureQueryLod , textureSize 


Copyright[edit]

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/.