From OpenGL Reference
Jump to navigation Jump to search

Perform a texture lookup with projection and offset.


gvec4 textureProjOffset( gsampler1D sampler, vec2 P, int offset, [float bias] );
gvec4 textureProjOffset( gsampler1D sampler, vec4 P, int offset, [float bias] );
gvec4 textureProjOffset( gsampler2D sampler, vec3 P, ivec2 offset, [float bias] );
gvec4 textureProjOffset( gsampler2D sampler, vec4 P, ivec2 offset, [float bias] );
gvec4 textureProjOffset( gsampler3D sampler, vec4 P, ivec3 offset, [float bias] );
float textureProjOffset( sampler1DShadow sampler, vec4 P, int offset, [float bias] );
float textureProjOffset( sampler2DShadow sampler, vec4 P, ivec2 offset, [float bias] );
gvec4 textureProjOffset( gsampler2DRect sampler, vec3 P, ivec2 offset );
gvec4 textureProjOffset( gsampler2DRect sampler, vec4 P, ivec2 offset );
float textureProjOffset( gsampler2DRectShadow sampler, vec4 P, ivec2 offset );


sampler - Specifies the sampler to which the texture from which texels will be retrieved is bound.
P - Specifies the texture coordinates at which the texture will be sampled.
offset - Specifies the offset that is applied to P before sampling occurs.
bias - Specifies an optional bias to be applied during level-of-detail computation.


 textureProjOffset performs a texture lookup with projection. 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 textureOffset , with the offset used to offset the computed texture coordinates.

Version Support[edit]

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

See Also[edit]

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