HCoop / clinton / guile-figl.git / blame
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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
| 2 | <!-- saved from url=(0013)about:internet --> | |
| 3 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glDrawArrays</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><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 border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><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> | |
| 4 | Specifies what kind of primitives to render. | |
| 5 | Symbolic constants | |
| 6 | <code class="constant">GL_POINTS</code>, | |
| 7 | <code class="constant">GL_LINE_STRIP</code>, | |
| 8 | <code class="constant">GL_LINE_LOOP</code>, | |
| 9 | <code class="constant">GL_LINES</code>, | |
| 10 | <code class="constant">GL_TRIANGLE_STRIP</code>, | |
| 11 | <code class="constant">GL_TRIANGLE_FAN</code>, | |
| 12 | <code class="constant">GL_TRIANGLES</code>, | |
| 13 | <code class="constant">GL_QUAD_STRIP</code>, | |
| 14 | <code class="constant">GL_QUADS</code>, | |
| 15 | and <code class="constant">GL_POLYGON</code> are accepted. | |
| 16 | </p></dd><dt><span class="term"><em class="parameter"><code>first</code></em></span></dt><dd><p> | |
| 17 | Specifies the starting index in the enabled arrays. | |
| 18 | </p></dd><dt><span class="term"><em class="parameter"><code>count</code></em></span></dt><dd><p> | |
| 19 | Specifies the number of indices to be rendered. | |
| 20 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
| 21 | <code class="function">glDrawArrays</code> specifies multiple geometric primitives | |
| 22 | with very few subroutine calls. Instead of calling a GL procedure | |
| 23 | to pass each individual vertex, normal, texture coordinate, edge | |
| 24 | flag, or color, you can prespecify | |
| 25 | separate arrays of vertices, normals, and colors and use them to | |
| 26 | construct a sequence of primitives with a single | |
| 27 | call to <code class="function">glDrawArrays</code>. | |
| 28 | </p><p> | |
| 29 | When <code class="function">glDrawArrays</code> is called, it uses <em class="parameter"><code>count</code></em> sequential elements from each | |
| 30 | enabled array to construct a sequence of geometric primitives, | |
| 31 | beginning with element <em class="parameter"><code>first</code></em>. <em class="parameter"><code>mode</code></em> specifies what kind of | |
| 32 | primitives are constructed and how the array elements | |
| 33 | construct those primitives. If <code class="constant">GL_VERTEX_ARRAY</code> is not enabled, no | |
| 34 | geometric primitives are generated. | |
| 35 | </p><p> | |
| 36 | Vertex attributes that are modified by <code class="function">glDrawArrays</code> have an | |
| 37 | unspecified value after <code class="function">glDrawArrays</code> returns. For example, if | |
| 38 | <code class="constant">GL_COLOR_ARRAY</code> is enabled, the value of the current color is | |
| 39 | undefined after <code class="function">glDrawArrays</code> executes. Attributes that aren't | |
| 40 | modified remain well defined. | |
| 41 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
| 42 | <code class="function">glDrawArrays</code> is available only if the GL version is 1.1 or greater. | |
| 43 | </p><p> | |
| 44 | <code class="function">glDrawArrays</code> is included in display lists. If <code class="function">glDrawArrays</code> is entered into a | |
| 45 | display list, | |
| 46 | the necessary array data (determined by the array pointers and | |
| 47 | enables) is also | |
| 48 | entered into the display list. Because the array pointers and | |
| 49 | enables are client-side state, their values affect display lists | |
| 50 | when the lists are created, not when the lists are executed. | |
| 51 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
| 52 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>mode</code></em> is not an accepted value. | |
| 53 | </p><p> | |
| 54 | <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>count</code></em> is negative. | |
| 55 | </p><p> | |
| 56 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to an | |
| 57 | enabled array and the buffer object's data store is currently mapped. | |
| 58 | </p><p> | |
| 59 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glDrawArrays</code> is executed between | |
| 60 | the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> and the corresponding <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
| 61 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
| 62 | <a class="citerefentry" href="glArrayElement.xml"><span class="citerefentry"><span class="refentrytitle">glArrayElement</span></span></a>, | |
| 63 | <a class="citerefentry" href="glColorPointer.xml"><span class="citerefentry"><span class="refentrytitle">glColorPointer</span></span></a>, | |
| 64 | <a class="citerefentry" href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>, | |
| 65 | <a class="citerefentry" href="glDrawRangeElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawRangeElements</span></span></a>, | |
| 66 | <a class="citerefentry" href="glEdgeFlagPointer.xml"><span class="citerefentry"><span class="refentrytitle">glEdgeFlagPointer</span></span></a>, | |
| 67 | <a class="citerefentry" href="glFogCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glFogCoordPointer</span></span></a>, | |
| 68 | <a class="citerefentry" href="glGetPointerv.xml"><span class="citerefentry"><span class="refentrytitle">glGetPointerv</span></span></a>, | |
| 69 | <a class="citerefentry" href="glIndexPointer.xml"><span class="citerefentry"><span class="refentrytitle">glIndexPointer</span></span></a>, | |
| 70 | <a class="citerefentry" href="glInterleavedArrays.xml"><span class="citerefentry"><span class="refentrytitle">glInterleavedArrays</span></span></a>, | |
| 71 | <a class="citerefentry" href="glNormalPointer.xml"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>, | |
| 72 | <a class="citerefentry" href="glSecondaryColorPointer.xml"><span class="citerefentry"><span class="refentrytitle">glSecondaryColorPointer</span></span></a>, | |
| 73 | <a class="citerefentry" href="glTexCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>, | |
| 74 | <a class="citerefentry" href="glVertexPointer.xml"><span class="citerefentry"><span class="refentrytitle">glVertexPointer</span></span></a> | |
| 75 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
| 76 | Copyright <span class="trademark"></span>© 1991-2006 | |
| 77 | Silicon Graphics, Inc. This document is licensed under the SGI | |
| 78 | Free Software B License. For details, see | |
| 79 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
| 80 | </p></div></div></body></html> |