1 <?xml version=
"1.0" encoding=
"UTF-8"?>
2 <!DOCTYPE book PUBLIC
"-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
3 "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
4 <refentry id=
"textureProjGradOffsetGrad">
9 <holder>Khronos Group
</holder>
12 <refentrytitle>textureProjGradOffset
</refentrytitle>
13 <manvolnum>3G
</manvolnum>
16 <refname>textureProjGradOffset
</refname>
17 <refpurpose>perform a texture lookup with projection, explicit gradients and offset
</refpurpose>
19 <refsynopsisdiv><title>Declaration
</title>
22 <funcdef>gvec4
<function>textureProjGradOffset
</function></funcdef>
23 <paramdef>gsampler1D
<parameter>sampler
</parameter></paramdef>
24 <paramdef>vec2
<parameter>P
</parameter></paramdef>
25 <paramdef>float
<parameter>dPdx
</parameter></paramdef>
26 <paramdef>float
<parameter>dPdy
</parameter></paramdef>
27 <paramdef>int
<parameter>offset
</parameter></paramdef>
30 <funcdef>gvec4
<function>textureProjGradOffset
</function></funcdef>
31 <paramdef>gsampler1D
<parameter>sampler
</parameter></paramdef>
32 <paramdef>vec4
<parameter>P
</parameter></paramdef>
33 <paramdef>float
<parameter>dPdx
</parameter></paramdef>
34 <paramdef>float
<parameter>dPdy
</parameter></paramdef>
35 <paramdef>int
<parameter>offset
</parameter></paramdef>
38 <funcdef>gvec4
<function>textureProjGradOffset
</function></funcdef>
39 <paramdef>gsampler2D
<parameter>sampler
</parameter></paramdef>
40 <paramdef>vec3
<parameter>P
</parameter></paramdef>
41 <paramdef>vec2
<parameter>dPdx
</parameter></paramdef>
42 <paramdef>vec2
<parameter>dPdy
</parameter></paramdef>
43 <paramdef>ivec2
<parameter>offset
</parameter></paramdef>
46 <funcdef>gvec4
<function>textureProjGradOffset
</function></funcdef>
47 <paramdef>gsampler2D
<parameter>sampler
</parameter></paramdef>
48 <paramdef>vec4
<parameter>P
</parameter></paramdef>
49 <paramdef>vec2
<parameter>dPdx
</parameter></paramdef>
50 <paramdef>vec2
<parameter>dPdy
</parameter></paramdef>
51 <paramdef>ivec2
<parameter>offset
</parameter></paramdef>
54 <funcdef>gvec4
<function>textureProjGradOffset
</function></funcdef>
55 <paramdef>gsampler3D
<parameter>sampler
</parameter></paramdef>
56 <paramdef>vec4
<parameter>P
</parameter></paramdef>
57 <paramdef>vec3
<parameter>dPdx
</parameter></paramdef>
58 <paramdef>vec3
<parameter>dPdy
</parameter></paramdef>
59 <paramdef>ivec3
<parameter>offset
</parameter></paramdef>
62 <funcdef>float
<function>textureProjGradOffset
</function></funcdef>
63 <paramdef>sampler1DShadow
<parameter>sampler
</parameter></paramdef>
64 <paramdef>vec4
<parameter>P
</parameter></paramdef>
65 <paramdef>float
<parameter>dPdx
</parameter></paramdef>
66 <paramdef>float
<parameter>dPdy
</parameter></paramdef>
67 <paramdef>int
<parameter>offset
</parameter></paramdef>
70 <funcdef>float
<function>textureProjGradOffset
</function></funcdef>
71 <paramdef>sampler2DShadow
<parameter>sampler
</parameter></paramdef>
72 <paramdef>vec4
<parameter>P
</parameter></paramdef>
73 <paramdef>vec2
<parameter>dPdx
</parameter></paramdef>
74 <paramdef>vec2
<parameter>dPdy
</parameter></paramdef>
75 <paramdef>ivec2
<parameter>offset
</parameter></paramdef>
78 <funcdef>gvec4
<function>textureProjGradOffset
</function></funcdef>
79 <paramdef>gsampler2DRect
<parameter>sampler
</parameter></paramdef>
80 <paramdef>vec3
<parameter>P
</parameter></paramdef>
81 <paramdef>vec2
<parameter>dPdx
</parameter></paramdef>
82 <paramdef>vec2
<parameter>dPdy
</parameter></paramdef>
83 <paramdef>ivec2
<parameter>offset
</parameter></paramdef>
86 <funcdef>gvec4
<function>textureProjGradOffset
</function></funcdef>
87 <paramdef>gsampler2DRect
<parameter>sampler
</parameter></paramdef>
88 <paramdef>vec4
<parameter>P
</parameter></paramdef>
89 <paramdef>vec2
<parameter>dPdx
</parameter></paramdef>
90 <paramdef>vec2
<parameter>dPdy
</parameter></paramdef>
91 <paramdef>ivec2
<parameter>offset
</parameter></paramdef>
94 <funcdef>float
<function>textureProjGradOffset
</function></funcdef>
95 <paramdef>gsampler2DRectShadow
<parameter>sampler
</parameter></paramdef>
96 <paramdef>vec4
<parameter>P
</parameter></paramdef>
97 <paramdef>vec2
<parameter>dPdx
</parameter></paramdef>
98 <paramdef>vec2
<parameter>dPdy
</parameter></paramdef>
99 <paramdef>ivec2
<parameter>offset
</parameter></paramdef>
103 <refsect1 id=
"parameters"><title>Parameters
</title>
106 <term><parameter>sampler
</parameter></term>
109 Specifies the sampler to which the texture from which texels will be retrieved is bound.
114 <term><parameter>P
</parameter></term>
117 Specifies the texture coordinates at which texture will be sampled.
122 <term><parameter>dPdx
</parameter></term>
125 Specifies the partial derivative of
<parameter>P
</parameter> with respect to window x.
130 <term><parameter>dPdy
</parameter></term>
133 Specifies the partial derivative of
<parameter>P
</parameter> with respect to window y.
138 <term><parameter>offset
</parameter></term>
141 Specifies the offsets, in texels at which the texture will be sampled relative to the projection of
<parameter>P
</parameter>.
147 <refsect1 id=
"description"><title>Description
</title>
149 <function>textureProjGradOffset
</function> performs a texture lookup with projection and explicit gradients and offsets. The texture coordinates
150 consumed from
<parameter>P
</parameter>, not including the last component of
<parameter>P
</parameter>,
151 are divided by the last component of
<parameter>P
</parameter>. The resulting
<inlineequation><mml:math><mml:msup><mml:mn>3</mml:mn><mml:mi>rd
</mml:mi></mml:msup></mml:math></inlineequation>
152 component of
<parameter>P
</parameter> in the shadow forms is used as
153 <inlineequation><mml:math><mml:msub><mml:mi>D
</mml:mi><mml:mi>ref
</mml:mi></mml:msub></mml:math></inlineequation>.
154 After these values are computed, the texture lookup proceeds as in
<citerefentry><refentrytitle>textureGradOffset
</refentrytitle></citerefentry>,
155 passing
<parameter>dPdx
</parameter> and
<parameter>dPdy
</parameter> as gradients, and
<parameter>offset
</parameter> as the offset.
158 <refsect1 id=
"versions"><title>Version Support
</title>
159 <informaltable frame=
"topbot">
164 <entry>textureProjGradOffset
</entry>#newin13#
167 <entry>textureProjGradOffset (gsampler2DRect{Shadow})
</entry>#newin14#
173 <refsect1 id=
"seealso"><title>See Also
</title>
175 <citerefentry><refentrytitle>texelFetch
</refentrytitle></citerefentry>,
176 <citerefentry><refentrytitle>texelFetchOffset
</refentrytitle></citerefentry>,
177 <citerefentry><refentrytitle>texture
</refentrytitle></citerefentry>,
178 <citerefentry><refentrytitle>textureGather
</refentrytitle></citerefentry>,
179 <citerefentry><refentrytitle>textureGatherOffset
</refentrytitle></citerefentry>,
180 <citerefentry><refentrytitle>textureGatherOffsets
</refentrytitle></citerefentry>,
181 <citerefentry><refentrytitle>textureGrad
</refentrytitle></citerefentry>,
182 <citerefentry><refentrytitle>textureGradOffset
</refentrytitle></citerefentry>,
183 <citerefentry><refentrytitle>textureLod
</refentrytitle></citerefentry>,
184 <citerefentry><refentrytitle>textureLodOffset
</refentrytitle></citerefentry>,
185 <citerefentry><refentrytitle>textureOffset
</refentrytitle></citerefentry>,
186 <citerefentry><refentrytitle>textureProj
</refentrytitle></citerefentry>,
187 <citerefentry><refentrytitle>textureProjGrad
</refentrytitle></citerefentry>,
188 <citerefentry><refentrytitle>textureProjLod
</refentrytitle></citerefentry>,
189 <citerefentry><refentrytitle>textureProjLodOffset
</refentrytitle></citerefentry>,
190 <citerefentry><refentrytitle>textureProjOffset
</refentrytitle></citerefentry>,
191 <citerefentry><refentrytitle>textureQueryLod
</refentrytitle></citerefentry>,
192 <citerefentry><refentrytitle>textureSize
</refentrytitle></citerefentry>
195 <refsect1 id=
"Copyright"><title>Copyright
</title>
197 Copyright
<trademark class=
"copyright"></trademark> 2011 Khronos Group.
198 This material may be distributed subject to the terms and conditions set forth in
199 the Open Publication License, v
1.0,
8 June
1999.
200 <ulink url=
"http://opencontent.org/openpub/">http://opencontent.org/openpub/
</ulink>.