textureProjGradOffset

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Perform a texture lookup with projection, explicit gradients and offset.

Declaration[edit]

gvec4 textureProjGradOffset( gsampler1D sampler, vec2 P, float dPdx, float dPdy, int offset );
gvec4 textureProjGradOffset( gsampler1D sampler, vec4 P, float dPdx, float dPdy, int offset );
gvec4 textureProjGradOffset( gsampler2D sampler, vec3 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
gvec4 textureProjGradOffset( gsampler2D sampler, vec4 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
gvec4 textureProjGradOffset( gsampler3D sampler, vec4 P, vec3 dPdx, vec3 dPdy, ivec3 offset );
float textureProjGradOffset( sampler1DShadow sampler, vec4 P, float dPdx, float dPdy, int offset );
float textureProjGradOffset( sampler2DShadow sampler, vec4 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
gvec4 textureProjGradOffset( gsampler2DRect sampler, vec3 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
gvec4 textureProjGradOffset( gsampler2DRect sampler, vec4 P, vec2 dPdx, vec2 dPdy, ivec2 offset );
float textureProjGradOffset( gsampler2DRectShadow sampler, vec4 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 offsets, in texels at which the texture will be sampled relative to the projection of P .


Description[edit]

 textureProjGradOffset performs a texture lookup with projection and explicit gradients and offsets. The texture coordinates consumed from P , not including the last component of P , are divided by the last component of P . The resulting [math][/math] component of P in the shadow forms is used as [math][/math] . After these values are computed, the texture lookup proceeds as in textureGradOffset , passing dPdx and dPdy as gradients, and offset as the offset.


Version Support[edit]

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

See Also[edit]

 texelFetch , texelFetchOffset , texture , textureGather , textureGatherOffset , textureGatherOffsets , textureGrad , textureGradOffset , textureLod , textureLodOffset , textureOffset , textureProj , textureProjGrad , 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/.