textureLod

From OpenGL Reference
Jump to navigation Jump to search

Perform a texture lookup with explicit level-of-detail.

Declaration[edit]

gvec4 textureLod( gsampler1D sampler, float P, float lod );
gvec4 textureLod( gsampler2D sampler, vec2 P, float lod );
gvec4 textureLod( gsampler3D sampler, vec3 P, float lod );
gvec4 textureLod( gsamplerCube sampler, vec3 P, float lod );
float textureLod( sampler1DShadow sampler, vec3 P, float lod );
float textureLod( sampler2DShadow sampler, vec3 P, float lod );
gvec4 textureLod( gsampler1DArray sampler, vec2 P, float lod );
gvec4 textureLod( gsampler2DArray sampler, vec3 P, float lod );
float textureLod( sampler1DArrayShadow sampler, vec3 P, float lod );
gvec4 textureLod( gsamplerCubeArray sampler, vec4 P, float lod );


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 - Specifies the explicit level-of-detail


Description[edit]

 textureLod performs a texture lookup at coordinate P from the texture bound to sampler with an explicit level-of-detail as specified in lod . lod specifies [math][/math] and sets the partial derivatives as follows:

 [math][/math] 


Version Support[edit]

textureLod 1.3+
textureLod (gsampler2DRect{Shadow}) 1.4+
textureLod (gsamplerCubeArray) 4.0+

See Also[edit]

 texelFetch , texelFetchOffset , texture , textureGather , textureGatherOffset , textureGatherOffsets , textureGrad , textureGradOffset , 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/.