<div class="refentry" id="glGetActiveUniform">

<div class="titlepage"></div>

<div class="refnamediv">

<h2>Name</h2>

<p>glGetActiveUniform — Returns information about an active uniform variable for the specified program object</p>

</div>

<div class="refsynopsisdiv">

<h2>C Specification</h2>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetActiveUniform</strong>(</code>

</td>

<td>GLuint <var class="pdparam">program</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLuint <var class="pdparam">index</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLsizei <var class="pdparam">bufSize</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLsizei *<var class="pdparam">length</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLint *<var class="pdparam">size</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLenum *<var class="pdparam">type</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLchar *<var class="pdparam">name</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

</div>

<div class="refsect1" id="parameters">

<h2>Parameters</h2>

<div class="variablelist">

<dl class="variablelist">

<dt>

<span class="term">

<em class="parameter">

<code>program</code>

</em>

</span>

</dt>

<dd>

<p>Specifies the program object to be

queried.</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>index</code>

</em>

</span>

</dt>

<dd>

<p>Specifies the index of the uniform variable to

be queried.</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>bufSize</code>

</em>

</span>

</dt>

<dd>

<p>Specifies the maximum number of characters

OpenGL is allowed to write in the character buffer

indicated by <em class="parameter"><code>name</code></em>.</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>length</code>

</em>

</span>

</dt>

<dd>

<p>Returns the number of characters actually

written by OpenGL in the string indicated by

<em class="parameter"><code>name</code></em> (excluding the null

terminator) if a value other than

<code class="constant">NULL</code> is passed.</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>size</code>

</em>

</span>

</dt>

<dd>

<p>Returns the size of the uniform

variable.</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>type</code>

</em>

</span>

</dt>

<dd>

<p>Returns the data type of the uniform

variable.</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>name</code>

</em>

</span>

</dt>

<dd>

<p>Returns a null terminated string containing

the name of the uniform variable.</p>

</dd>

</dl>

</div>

</div>

<div class="refsect1" id="description">

<h2>Description</h2>

<p><code class="function">glGetActiveUniform</code> returns

information about an active uniform variable in the program

object specified by <em class="parameter"><code>program</code></em>. The number

of active uniform variables can be obtained by calling

<a class="citerefentry" href="glGetProgramiv"><span class="citerefentry"><span class="refentrytitle">glGetProgramiv</span></span></a>

with the value <code class="constant">GL_ACTIVE_UNIFORMS</code>. A value

of zero for <em class="parameter"><code>index</code></em> selects the first active

uniform variable. Permissible values for

<em class="parameter"><code>index</code></em> range from zero to the number of

active uniform variables minus one.</p>

<p>Shaders may use either built-in uniform variables,

user-defined uniform variables, or both. Built-in uniform

variables have a prefix of "gl_" and reference

existing OpenGL state or values derived from such state (e.g.,

<em class="parameter"><code>gl_DepthRange</code></em>, see the OpenGL

Shading Language specification for a complete list.)

User-defined uniform variables have arbitrary names and obtain

their values from the application through calls to

<a class="citerefentry" href="glUniform"><span class="citerefentry"><span class="refentrytitle">glUniform</span></span></a>.

A uniform variable (either built-in or user-defined) is

considered active if it is determined during the link operation

that it may be accessed during program execution. Therefore,

<em class="parameter"><code>program</code></em> should have previously been the

target of a call to

<a class="citerefentry" href="glLinkProgram"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,

but it is not necessary for it to have been linked

successfully.</p>

<p>The size of the character buffer required to store the

longest uniform variable name in <em class="parameter"><code>program</code></em>

can be obtained by calling

<a class="citerefentry" href="glGetProgramiv"><span class="citerefentry"><span class="refentrytitle">glGetProgramiv</span></span></a>

with the value

<code class="constant">GL_ACTIVE_UNIFORM_MAX_LENGTH</code>. This value

should be used to allocate a buffer of sufficient size to store

the returned uniform variable name. The size of this character

buffer is passed in <em class="parameter"><code>bufSize</code></em>, and a

pointer to this character buffer is passed in

<em class="parameter"><code>name.</code></em></p>

<p><code class="function">glGetActiveUniform</code> returns the name

of the uniform variable indicated by

<em class="parameter"><code>index</code></em>, storing it in the character buffer

specified by <em class="parameter"><code>name</code></em>. The string returned

will be null terminated. The actual number of characters written

into this buffer is returned in <em class="parameter"><code>length</code></em>,

and this count does not include the null termination character.

If the length of the returned string is not required, a value of

<code class="constant">NULL</code> can be passed in the

<em class="parameter"><code>length</code></em> argument.</p>

<p>The <em class="parameter"><code>type</code></em>

argument will return a pointer to the uniform variable's data

type. The symbolic constants returned for uniform types are shown in the

table below.

</p>

<div class="informaltable">

<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">

<colgroup>

<col style="text-align: left; "/>

<col style="text-align: left; "/>

</colgroup>

<thead>

<tr>

<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong> Returned Symbolic Contant </strong></span>

</th>

<th style="text-align: left; border-bottom: 2px solid ; "><span class="bold"><strong> Shader Uniform Type </strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">float</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_VEC2</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">vec2</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_VEC3</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">vec3</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_VEC4</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">vec4</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">int</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT_VEC2</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">ivec2</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT_VEC3</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">ivec3</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT_VEC4</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">ivec4</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">unsigned int</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT_VEC2</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">uvec2</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT_VEC3</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">uvec3</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT_VEC4</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">uvec4</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_BOOL</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">bool</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_BOOL_VEC2</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">bvec2</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_BOOL_VEC3</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">bvec3</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_BOOL_VEC4</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">bvec4</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT2</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat2</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT3</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat3</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT4</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat4</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT2x3</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat2x3</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT2x4</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat2x4</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT3x2</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat3x2</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT3x4</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat3x4</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT4x2</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat4x2</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_FLOAT_MAT4x3</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">mat4x3</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_SAMPLER_2D</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">sampler2D</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_SAMPLER_3D</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">sampler3D</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_SAMPLER_CUBE</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">samplerCube</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_SAMPLER_2D_SHADOW</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">sampler2DShadow</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_SAMPLER_2D_ARRAY</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">sampler2DArray</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_SAMPLER_2D_ARRAY_SHADOW</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">sampler2DArrayShadow</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_SAMPLER_CUBE_SHADOW</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">samplerCubeShadow</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT_SAMPLER_2D</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">isampler2D</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT_SAMPLER_3D</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">isampler3D</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT_SAMPLER_CUBE</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">isamplerCube</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_INT_SAMPLER_2D_ARRAY</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">isampler2DArray</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT_SAMPLER_2D</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">usampler2D</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT_SAMPLER_3D</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">usampler3D</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT_SAMPLER_CUBE</code>

</td>

<td style="text-align: left; border-bottom: 2px solid ; ">

<code class="constant">usamplerCube</code>

</td>

</tr>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">

<code class="constant">GL_UNSIGNED_INT_SAMPLER_2D_ARRAY</code>

</td>

<td style="text-align: left; ">

<code class="constant">usampler2DArray</code>

</td>

</tr>

</tbody>

</table>

</div>

<p>

</p>

<p>If one or more elements of an array are active, the name

of the array is returned in <em class="parameter"><code>name</code></em>, the

type is returned in <em class="parameter"><code>type</code></em>, and the

<em class="parameter"><code>size</code></em> parameter returns the highest array

element index used, plus one, as determined by the compiler

and/or linker. Only one active uniform variable will be reported

for a uniform array. If the active uniform is an array, the uniform

name returned in <em class="parameter"><code>name</code></em> will always

be the name of the uniform array appended with "[0]".</p>

<p>Uniform variables that are declared as structures or

arrays of structures will not be returned directly by this

function. Instead, each of these uniform variables will be

reduced to its fundamental components containing the

"." and "[]" operators such that each of the

names is valid as an argument to

<a class="citerefentry" href="glGetUniformLocation"><span class="citerefentry"><span class="refentrytitle">glGetUniformLocation</span></span></a>.

Each of these reduced uniform variables is counted as one active

uniform variable and is assigned an index. A valid name cannot

be a structure, an array of structures, or a subcomponent of a

vector or matrix.</p>

<p>The size of the uniform variable will be returned in

<em class="parameter"><code>size</code></em>. Uniform variables other than arrays

will have a size of 1. Structures and arrays of structures will

be reduced as described earlier, such that each of the names

returned will be a data type in the earlier list. If this

reduction results in an array, the size returned will be as

described for uniform arrays; otherwise, the size returned will

be 1.</p>

<p>The list of active uniform variables may include both

built-in uniform variables (which begin with the prefix

"gl_") as well as user-defined uniform variable

names.</p>

<p>This function will return as much information as it can

about the specified active uniform variable. If no information

is available, <em class="parameter"><code>length</code></em> will be 0, and

<em class="parameter"><code>name</code></em> will be an empty string. This

situation could occur if this function is called after a link

operation that failed. If an error occurs, the return values

<em class="parameter"><code>length</code></em>, <em class="parameter"><code>size</code></em>,

<em class="parameter"><code>type</code></em>, and <em class="parameter"><code>name</code></em>

will be unmodified.</p>

</div>

<div class="refsect1" id="errors">

<h2>Errors</h2>

<p><code class="constant">GL_INVALID_VALUE</code> is generated if

<em class="parameter"><code>program</code></em> is not a value generated by

OpenGL.</p>

<p><code class="constant">GL_INVALID_OPERATION</code> is generated if

<em class="parameter"><code>program</code></em> is not a program object.</p>

<p><code class="constant">GL_INVALID_VALUE</code> is generated if

<em class="parameter"><code>index</code></em> is greater than or equal to the

number of active uniform variables in

<em class="parameter"><code>program</code></em>.</p>

<p><code class="constant">GL_INVALID_VALUE</code> is generated if

<em class="parameter"><code>bufSize</code></em> is less than 0.</p>

</div>

<div class="refsect1" id="associatedgets">

<h2>Associated Gets</h2>

<p><a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>

with argument <code class="constant">GL_MAX_VERTEX_UNIFORM_COMPONENTS</code>,

<code class="constant">GL_MAX_FRAGMENT_UNIFORM_COMPONENTS</code>,

<code class="constant">GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS</code>, or

<code class="constant">GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS</code>.</p>

<p><a class="citerefentry" href="glGetProgramiv"><span class="citerefentry"><span class="refentrytitle">glGetProgramiv</span></span></a>

with argument <code class="constant">GL_ACTIVE_UNIFORMS</code> or

<code class="constant">GL_ACTIVE_UNIFORM_MAX_LENGTH</code>.</p>

<p>

<a class="citerefentry" href="glIsProgram">

<span class="citerefentry">

<span class="refentrytitle">glIsProgram</span>

</span>

</a>

</p>

</div>

{$pipelinestall}{$examples}

<div class="refsect1" id="versions">

<h2>API Version Support</h2>

<div class="informaltable">

<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">

<colgroup>

<col style="text-align: left; "/>

<col style="text-align: center; " class="firstvers"/>

<col style="text-align: center; "/>

<col style="text-align: center; " class="lastvers"/>

</colgroup>

<thead>

<tr>

<th style="text-align: left; border-right: 2px solid ; ">

</th>

<th style="text-align: center; border-bottom: 2px solid ; " colspan="3">

<span class="bold"><strong>OpenGL ES API Version</strong></span>

</th>

</tr>

<tr>

<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>Function Name</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>2.0</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.0</strong></span>

</th>

<th style="text-align: center; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.1</strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">glGetActiveUniform</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; ">✔</td>

</tr>

</tbody>

</table>

</div>

</div>

<div class="refsect1" id="seealso">

<h2>See Also</h2>

<p><a class="citerefentry" href="glGetUniform"><span class="citerefentry"><span class="refentrytitle">glGetUniform</span></span></a>,

<a class="citerefentry" href="glGetUniformLocation"><span class="citerefentry"><span class="refentrytitle">glGetUniformLocation</span></span></a>,

<a class="citerefentry" href="glLinkProgram"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,

<a class="citerefentry" href="glUniform"><span class="citerefentry"><span class="refentrytitle">glUniform</span></span></a>,

<a class="citerefentry" href="glUseProgram"><span class="citerefentry"><span class="refentrytitle">glUseProgram</span></span></a></p>

</div>

<div class="refsect1" id="Copyright">

<h2>Copyright</h2>

<p>

Copyright © 2003-2005 3Dlabs Inc. Ltd.

Copyright © 2010-2014 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.

<a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p>

</div>

</div>