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Compute the level-of-detail that would be used to sample from a texture.


vec2 textureQueryLod( gsampler1D sampler, float P );
vec2 textureQueryLod( gsampler2D sampler, vec2 P );
vec2 textureQueryLod( gsampler3D sampler, vec3 P );
vec2 textureQueryLod( gsamplerCube sampler, vec3 P );
vec2 textureQueryLod( gsampler1DArray sampler, float P );
vec2 textureQueryLod( gsampler2DDArray sampler, vec2 P );
vec2 textureQueryLod( gsamplerCubeArray sampler, vec3 P );
vec2 textureQueryLod( gsampler1DShadow sampler, float P );
vec2 textureQueryLod( gsampler2DShadow sampler, vec2 P );
vec2 textureQueryLod( gsamplerCubeShadow sampler, vec3 P );
vec2 textureQueryLod( gsampler1DArrayShadow sampler, float P );
vec2 textureQueryLod( gsampler2DArrayShadow sampler, vec2 P );
vec2 textureQueryLod( gsamplerCubeArrayShadow sampler, vec3 P );


sampler - Specifies the sampler to which the texture whose level-of-detail will be queried is bound.
P - Specifies the texture coordinates at which the level-of-detail will be queried.


Available only in the fragment shader, textureQueryLod computes the level-of-detail that would be used to sample from a texture. The mipmap array(s) that would be accessed is returned in thexcomponent of the return value. The computed level-of-detail relative to the base level is returned in theycomponent of the return value.

If called on an incomplete texture, the result of the operation is undefined.

Version Support[edit]

textureQueryLod 4.0+

See Also[edit]

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


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/.