Name
textureOffset — perform a texture lookup with offset
Declaration
gvec4 textureOffset( | gsampler1D | sampler, |
| float | P, |
| int | offset, |
| [float | bias]) ; |
gvec4 textureOffset( | gsampler2D | sampler, |
| vec2 | P, |
| ivec2 | offset, |
| [float | bias]) ; |
gvec4 textureOffset( | gsampler3D | sampler, |
| vec3 | P, |
| ivec3 | offset, |
| [float | bias]) ; |
gvec4 textureOffset( | gsampler2DRect | sampler, |
| vec2 | P, |
| ivec2 | offset) ; |
float textureOffset( | sampler2DRectShadow | sampler, |
| vec3 | P, |
| ivec2 | offset) ; |
float textureOffset( | sampler1DShadow | sampler, |
| vec3 | P, |
| int | offset, |
| [float | bias]) ; |
float textureOffset( | sampler2DShadow | sampler, |
| vec4 | P, |
| ivec2 | offset, |
| [float | bias]) ; |
gvec4 textureOffset( | gsampler1DArray | sampler, |
| vec2 | P, |
| int | offset, |
| [float | bias]) ; |
gvec4 textureOffset( | gsampler2DArray | sampler, |
| vec3 | P, |
| ivec2 | offset, |
| [float | bias]) ; |
float textureOffset( | sampler1DArrayShadow | sampler, |
| vec3 | P, |
| int | offset) ; |
float textureOffset( | sampler2DArrayShadow | sampler, |
| vec4 | P, |
| vec2 | offset) ; |
Parameters
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.
offset
Specifies offset, in texels that will be applied to P
before looking up the texel.
Description
textureOffset
performs a texture lookup at coordinate P
from the
texture bound to sampler
with an an additional offset, specified in texels in offset
that will be applied to the (u, v, w) texture coordinates before looking up each texel.
The offset value must be a constant expression. A limited range of offset values are supported;
the minimum and maximum offset values are implementation-dependent and may be determined
by querying GL_MIN_PROGRAM_TEXEL_OFFSET
and GL_MAX_PROGRAM_TEXEL_OFFSET
,
respectively.
Note that offset
does not apply to the layer coordinate for texture arrays. Also note
that offsets are not supported for cube maps.
See Also
texelFetch,
texelFetchOffset,
texture,
textureGather,
textureGatherOffset,
textureGatherOffsets,
textureGrad,
textureGradOffset,
textureLod,
textureLodOffset,
textureProj,
textureProjGrad,
textureProjGradOffset,
textureProjLod,
textureProjLodOffset,
textureProjOffset,
textureQueryLod,
textureSize
Copyright
Copyright © 2011-2012 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/.