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NAME
texelFetch - perform a lookup of a single texel within a texture
DECLARATION
gvec4 texelFetch(gsampler1D sampler, int P, int lod);
gvec4 texelFetch(gsampler2D sampler, ivec2 P, int lod);
gvec4 texelFetch(gsampler3D sampler, ivec3 P, int lod);
gvec4 texelFetch(gsampler2DRect sampler, ivec2 P);
gvec4 texelFetch(gsampler1DArray sampler, ivec2 P, int lod);
gvec4 texelFetch(gsampler2DArray sampler, ivec3 P, int lod);
gvec4 texelFetch(gsamplerBuffer sampler, int P);
gvec4 texelFetch(gsampler2DMS sampler, ivec2 P, sample sample);
gvec4 texelFetch(gsampler2DMSArray sampler, ivec3 P, sample sample);
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.
lod
If present, specifies the level-of-detail within the texture from which the texel will
be fetched.
sample
For multisampled fetches, specifies which sample within the texel from which which
will be returned.
DESCRIPTION
texelFetch performs a lookup of a single texel from texture coordinate P in the texture
bound to sampler. 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 specifies which sample within the texel will be returned when reading
from a multi-sample texure.
VERSION SUPPORT
┌───────────────────┬───────────────────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Shading Language Version │
├───────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
│Function │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├───────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
│texelFetch │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├───────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
│texelFetch │ - │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
│(gsampler2DRect, │ │ │ │ │ │ │ │ │ │ │ │ │
│gsamplerBuffer) │ │ │ │ │ │ │ │ │ │ │ │ │
├───────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
│texelFetch │ - │ - │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
│(gsampler2DMS, │ │ │ │ │ │ │ │ │ │ │ │ │
│gsampler2DMSArray) │ │ │ │ │ │ │ │ │ │ │ │ │
└───────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘
SEE ALSO
texelFetch(), texture(), textureGather(), textureGatherOffset(), textureGatherOffsets(),
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
[FIXME: source] 07/22/2015 TEXELFETCH(3G)