'\" t
.\"     Title: texture
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 05/21/2015
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "TEXTURE" "3G" "05/21/2015" "[FIXME: source]" "[FIXME: manual]"
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.\" * MAIN CONTENT STARTS HERE *
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.SH "NAME"
texture \- retrieves texels from a texture
.SH "DECLARATION"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsampler1D\ " "sampler" ", float\ " "P" ", [float\ " "bias" "]);"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsampler2D\ " "sampler" ", vec2\ " "P" ", [float\ " "bias" "]);"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsampler3D\ " "sampler" ", vec3\ " "P" ", [float\ " "bias" "]);"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsamplerCube\ " "sampler" ", vec3\ " "P" ", [float\ " "bias" "]);"
.HP \w'float\ texture('u
.BI "float texture(sampler1DShadow\ " "sampler" ", vec3\ " "P" ", [float\ " "bias" "]);"
.HP \w'float\ texture('u
.BI "float texture(sampler2DShadow\ " "sampler" ", vec3\ " "P" ", [float\ " "bias" "]);"
.HP \w'float\ texture('u
.BI "float texture(samplerCubeShadow\ " "sampler" ", vec3\ " "P" ", [float\ " "bias" "]);"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsampler1DArray\ " "sampler" ", vec2\ " "P" ", [float\ " "bias" "]);"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsampler2DArray\ " "sampler" ", vec3\ " "P" ", [float\ " "bias" "]);"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsamplerCubeArray\ " "sampler" ", vec4\ " "P" ", [float\ " "bias" "]);"
.HP \w'float\ texture('u
.BI "float texture(sampler1DArrayShadow\ " "sampler" ", vec3\ " "P" ", [float\ " "bias" "]);"
.HP \w'float\ texture('u
.BI "float texture(gsampler2DArrayShadow\ " "sampler" ", vec4\ " "P" ", [float\ " "bias" "]);"
.HP \w'gvec4\ texture('u
.BI "gvec4 texture(gsampler2DRect\ " "sampler" ", vec2\ " "P" ");"
.HP \w'float\ texture('u
.BI "float texture(sampler2DRectShadow\ " "sampler" ", vec3\ " "P" ");"
.HP \w'float\ texture('u
.BI "float texture(gsamplerCubeArrayShadow\ " "sampler" ", vec4\ " "P" ", float\ " "compare" ");"
.SH "PARAMETERS"
.PP
\fIsampler\fR
.RS 4
Specifies the sampler to which the texture from which texels will be retrieved is bound\&.
.RE
.PP
\fIP\fR
.RS 4
Specifies the texture coordinates at which texture will be sampled\&.
.RE
.PP
\fIbias\fR
.RS 4
Specifies an optional bias to be applied during level\-of\-detail computation\&.
.RE
.PP
\fIcompare\fR
.RS 4
Specifies the value to which the fetched texel will be compared when sampling from
gsamplerCubeArrayShadow\&.
.RE
.SH "DESCRIPTION"
.PP
\fBtexture\fR
samples texels from the texture bound to
\fIsampler\fR
at texture coordinate
\fIP\fR\&. An optional bias, specified in
\fIbias\fR
is included in the level\-of\-detail computation that is used to choose mipmap(s) from which to sample\&.
.PP
For
\fIshadow\fR
forms, when
\fIcompare\fR
is present, it is used as
Dsub
and the array layer is specified in
\fIP\fR\&.w\&. When
\fIcompare\fR
is not present, the last component of
\fIP\fR
is used as
Dsub
and the array layer is specified in the second to last component of
\fIP\fR\&. (The second component of
\fIP\fR
is unused for
\fI1D\fR
shadow lookups\&.)
.PP
For non\-shadow variants, the array layer comes from the last component of
\fIP\fR\&.
.SH "VERSION SUPPORT"
.TS
allbox tab(:);
lB cB s s s s s s s s s s s
lB cB cB cB cB cB cB cB cB cB cB cB cB.
T{

T}:T{
\fBOpenGL Shading Language Version\fR
T}
T{
\fBFunction Name\fR
T}:T{
\fB1\&.10\fR
T}:T{
\fB1\&.20\fR
T}:T{
\fB1\&.30\fR
T}:T{
\fB1\&.40\fR
T}:T{
\fB1\&.50\fR
T}:T{
\fB3\&.30\fR
T}:T{
\fB4\&.00\fR
T}:T{
\fB4\&.10\fR
T}:T{
\fB4\&.20\fR
T}:T{
\fB4\&.30\fR
T}:T{
\fB4\&.40\fR
T}:T{
\fB4\&.50\fR
T}
.T&
l c c c c c c c c c c c c
l c c c c c c c c c c c c
l c c c c c c c c c c c c
l c c c c c c c c c c c c.
T{
texture
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
T{
texture (gsampler2DRect{Shadow})
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
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✔
T}
T{
texture (gsampler2DMS, gsampler2DMSArray)
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
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✔
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✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
T{
texture (gsamplerCubeArray{Shadow})
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
.TE
.sp
.SH "SEE ALSO"
.PP
\fBtexelFetch\fR(),
\fBtexelFetchOffset\fR(),
\fBtextureGather\fR(),
\fBtextureGatherOffset\fR(),
\fBtextureGatherOffsets\fR(),
\fBtextureGrad\fR(),
\fBtextureGradOffset\fR(),
\fBtextureLod\fR(),
\fBtextureLodOffset\fR(),
\fBtextureOffset\fR(),
\fBtextureProj\fR(),
\fBtextureProjGrad\fR(),
\fBtextureProjGradOffset\fR(),
\fBtextureProjLod\fR(),
\fBtextureProjLodOffset\fR(),
\fBtextureProjOffset\fR(),
\fBtextureQueryLod\fR(),
\fBtextureSize\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
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\&.
\m[blue]\fBhttp://opencontent\&.org/openpub/\fR\m[]\&.
.SH "COPYRIGHT"
.br
Copyright \(co 2011-2014 Khronos Group
.br