<div class="refentry" lang="en" xml:lang="en"><a id="glDrawArrays"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glDrawArrays — render primitives from array data</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table><tr><td><code class="funcdef">void <b class="fsfunc">glDrawArrays</b>(</code></td><td>GLenum  </td><td><var class="pdparam">mode</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">first</var>, </td></tr><tr><td> </td><td>GLsizei  </td><td><var class="pdparam">count</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>mode</code></em></span></dt><dd><p>

Specifies what kind of primitives to render.

Symbolic constants

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

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

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

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

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

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

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

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

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

<code class="constant">GL_TRIANGLE_STRIP_ADJACENCY</code> and

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

are accepted.

</p></dd><dt><span class="term"><em class="parameter"><code>first</code></em></span></dt><dd><p>

Specifies the starting index in the enabled arrays.

</p></dd><dt><span class="term"><em class="parameter"><code>count</code></em></span></dt><dd><p>

Specifies the number of indices to be rendered.

</p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>

<code class="function">glDrawArrays</code> specifies multiple geometric primitives

with very few subroutine calls. Instead of calling a GL procedure

to pass each individual vertex, normal, texture coordinate, edge

flag, or color, you can prespecify

separate arrays of vertices, normals, and colors and use them to

construct a sequence of primitives with a single

call to <code class="function">glDrawArrays</code>.

</p><p>

When <code class="function">glDrawArrays</code> is called, it uses <em class="parameter"><code>count</code></em> sequential elements from each

enabled array to construct a sequence of geometric primitives,

beginning with element <em class="parameter"><code>first</code></em>. <em class="parameter"><code>mode</code></em> specifies what kind of

primitives are constructed and how the array elements

construct those primitives.

</p><p>

Vertex attributes that are modified by <code class="function">glDrawArrays</code> have an

unspecified value after <code class="function">glDrawArrays</code> returns. Attributes that aren't

modified remain well defined.

</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>

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

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

<code class="constant">GL_TRIANGLE_STRIP_ADJACENCY</code> and

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

are available only if the GL version is 3.2 or greater.

</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>

<code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>mode</code></em> is not an accepted value.

</p><p>

<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>count</code></em> is negative.

</p><p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to an

enabled array and the buffer object's data store is currently mapped.

</p><p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if a geometry shader is active and <em class="parameter"><code>mode</code></em>

is incompatible with the input primitive type of the geometry shader in the currently installed program object.

</p></div>

{$pipelinestall}{$examples}

<div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>

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

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

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

</p></div><div class="refsect1" lang="en" xml:lang="en"><div id="Copyright"><h2>Copyright</h2><p>

Copyright © 1991-2006

Silicon Graphics, Inc. This document is licensed under the SGI

Free Software B License. For details, see

<a href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.

</p></div></div></div>