texelFetch - perform a lookup of a single texel within a texture

       Copyright © 2011-2014 Khronos Group

[FIXME: source]                                    11/18/2024                                     TEXELFETCH(3G)

gvec4texelFetch(gsampler1Dsampler,intP,intlod);gvec4texelFetch(gsampler2Dsampler,ivec2P,intlod);gvec4texelFetch(gsampler3Dsampler,ivec3P,intlod);gvec4texelFetch(gsampler2DRectsampler,ivec2P);gvec4texelFetch(gsampler1DArraysampler,ivec2P,intlod);gvec4texelFetch(gsampler2DArraysampler,ivec3P,intlod);gvec4texelFetch(gsamplerBuffersampler,intP);gvec4texelFetch(gsampler2DMSsampler,ivec2P,samplesample);gvec4texelFetch(gsampler2DMSArraysampler,ivec3P,samplesample);

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.

       texelFetch - perform a lookup of a single texel within a texture

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.

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

       ┌────────────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │                    │        OpenGLShadingLanguageVersion                                            │
       ├────────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │ 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) │      │      │      │      │      │      │      │      │      │      │      │      │
       └────────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘