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TEXTUREGATHEROFFSETS(3G) [FIXME: manual] TEXTUREGATHEROFFSETS(3G)

NAME

textureGatherOffsets - gathers four texels from a texture with an array of offsets

DECLARATION

gvec4 textureGatherOffsets(gsampler2D sampler, vec2 P, ivec2 offsets[4], [int comp]);

gvec4 textureGatherOffsets(gsampler2DArray sampler, vec3 P, ivec2 offsets[4], [int comp]);

gvec4 textureGatherOffsets(gsampler2DRect sampler, vec3 P, ivec2 offsets[4], [int comp]);

vec4 textureGatherOffsets(gsampler2DShadow sampler, vec2 P, float refZ, ivec2 offsets[4]);

vec4 textureGatherOffsets(gsampler2DArrayShadow sampler, vec3 P, float refZ, ivec2 offsets[4]);

vec4 textureGatherOffsets(gsampler2DRectShadow sampler, vec3 P, float refZ, ivec2 offsets[4]);

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.

comp

Specifies the component of the source texture that will be used to generate the resulting vector.

refZ

Specifies the reference Z value used in the comparison for shadow forms.

offsets

Specifies an array of offsets from the specified texture coordinate P from which the texels will be gathered.

DESCRIPTION

textureGatherOffsets operates identically to textureGatherOffset(), except that offsets is used to determine the location of the four texels to sample. Each of the four texels is obtained by applying the offset in offsets as a (u, v) coordinate offset to P, identifying the four-texel GL_LINEAR footprint, and then selecting the texel i0i0 of that footprint. The specified values in offsets must be set with constant integral expressions.

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
textureGatherOffsets - - - - - - ✔ ✔ ✔ ✔ ✔ ✔

SEE ALSO

texelFetch(), texelFetchOffset(), texture(), textureGather(), textureGatherOffset(), textureGrad(), textureGradOffset(), textureLod(), textureLodOffset(), textureOffset(), textureProj(), 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. http://opencontent.org/openpub/.

COPYRIGHT

Copyright © 2011-2014 Khronos Group

01/03/2018 [FIXME: source]