textureProjGrad

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Perform a texture lookup with projection and explicit gradients.

Declaration[edit]

gvec4 textureProjGrad( gsampler1D sampler, vec2 P, float pDx, float pDy );
gvec4 textureProjGrad( gsampler1D sampler, vec4 P, float pDx, float pDy );
gvec4 textureProjGrad( gsampler2D sampler, vec3 P, vec2 pDx, vec2 pDy );
gvec4 textureProjGrad( gsampler2D sampler, vec4 P, vec2 pDx, vec2 pDy );
gvec4 textureProjGrad( gsampler3D sampler, vec4 P, vec3 pDx, vec3 pDy );
float textureProjGrad( sampler1DShadow sampler, vec4 P, float pDx, float pDy );
float textureProjGrad( sampler2DShadow sampler, vec4 P, vec2 pDx, vec2 pDy );
gvec4 textureProjGrad( gsampler2DRect sampler, vec3 P, vec2 pDx, vec2 pDy );
gvec4 textureProjGrad( gsampler2DRect sampler, vec4 P, vec2 pDx, vec2 pDy );
float textureProjGrad( gsampler2DRectShadow sampler, vec4 P, vec2 pDx, vec2 pDy );


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.


Description[edit]

 textureProjGrad performs a texture lookup with projection and explicit gradients. 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 textureGrad , passing dPdx and dPdy as gradients.


Version Support[edit]

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

See Also[edit]

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