textureGradOffset

From OpenGL Reference
Jump to navigation Jump to search

Perform a texture lookup with explicit gradients and offset.

Declaration[edit]

gvec4 textureGradOffset( gsampler1D sampler, float P, float dPdx, float dPdy, int offset );
gvec4 textureGradOffset( gsampler2D sampler, vec2 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
gvec4 textureGradOffset( gsampler3D sampler, vec3 P, vec3 dPdx, vec3 dPdy, ivec3 offset );
gvec4 textureGradOffset( gsampler2DRect sampler, vec2 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
float textureGradOffset( gsampler2DRectShadow sampler, vec3 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
float textureGradOffset( sampler1DShadow sampler, vec3 P, float dPdx, float dPdy, int offset );
float textureGradOffset( sampler2DShadow sampler, vec3 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
gvec4 textureGradOffset( gsampler1DArray sampler, vec2 P, float dPdx, float dPdy, int offset );
gvec4 textureGradOffset( gsampler2DArray sampler, vec3 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
float textureGradOffset( sampler1DArrayShadow sampler, vec3 P, float dPdx, float dPdy, int offset );
float textureGradOffset( sampler2DArrayShadow sampler, vec3 P, vec2 dPdx, vec2 dPdy, ivec2 offset );


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.
dPdx - Specifies the partial derivative of P with respect to window x.
dPdy - Specifies the partial derivative of P with respect to window y.
offset - Specifies the offset to be applied to the texture coordinates before sampling.


Description[edit]

 textureGradOffset performs a texture lookup at coordinate P from the texture bound to sampler with explicit texture coordinate gradiends as specified in dPdx and dPdy . An explicit offset is also supplied in offset . textureGradOffset consumes dPdx and dPdy as textureGrad and offset as textureOffset .


Version Support[edit]

textureGradOffset 1.3+
textureGradOffset (gsampler2DRect{Shadow}) 1.4+

See Also[edit]

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