Light | Dark

docs.GL

texelFetch

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 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
texelFetch - - ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
texelFetch (gsampler2DRect, gsamplerBuffer) - - - ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
texelFetch (gsampler2DMS, gsampler2DMSArray) - - - - ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
Think you can improve this page? Edit this page on GitHub.