HCoop / clinton / guile-figl.git / blame
| Commit | Line | Data |
|---|---|---|
| 7faf1d71 AW |
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>glBlendColor</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glBlendColor"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glBlendColor — set the blend color</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">glBlendColor</b>(</code></td><td>GLclampf </td><td><var class="pdparam">red</var>, </td></tr><tr><td> </td><td>GLclampf </td><td><var class="pdparam">green</var>, </td></tr><tr><td> </td><td>GLclampf </td><td><var class="pdparam">blue</var>, </td></tr><tr><td> </td><td>GLclampf </td><td><var class="pdparam">alpha</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>red</code></em>, </span><span class="term"><em class="parameter"><code>green</code></em>, </span><span class="term"><em class="parameter"><code>blue</code></em>, </span><span class="term"><em class="parameter"><code>alpha</code></em></span></dt><dd><p> | |
| 4 | specify the components of <code class="constant">GL_BLEND_COLOR</code> | |
| 5 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
| 6 | The <code class="constant">GL_BLEND_COLOR</code> may be used to calculate the source and destination | |
| 7 | blending factors. The color components are clamped to the range | |
| 8 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
| 9 | ||
| 10 | <mml:mfenced open="[" close="]"> | |
| 11 | <mml:mn>0</mml:mn> | |
| 12 | <mml:mn>1</mml:mn> | |
| 13 | </mml:mfenced> | |
| 14 | </mml:math> | |
| 15 | before being stored. See <a class="citerefentry" href="glBlendFunc.xml"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a> for a complete description of the | |
| 16 | blending operations. | |
| 17 | Initially the <code class="constant">GL_BLEND_COLOR</code> is set to (0, 0, 0, 0). | |
| 18 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
| 19 | <code class="function">glBlendColor</code> is part of the <code class="code">ARB_imaging</code> subset. <code class="function">glBlendColor</code> is present only | |
| 20 | if <code class="code">ARB_imaging</code> is returned when <a class="citerefentry" href="glGetString.xml"><span class="citerefentry"><span class="refentrytitle">glGetString</span></span></a> is called with | |
| 21 | <code class="constant">GL_EXTENSIONS</code> as its argument. | |
| 22 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
| 23 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glBlendColor</code> is executed | |
| 24 | between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> and the corresponding | |
| 25 | execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
| 26 | </p><p> | |
| 27 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
| 28 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with an argument of <code class="constant">GL_BLEND_COLOR</code> | |
| 29 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
| 30 | <a class="citerefentry" href="glBlendEquation.xml"><span class="citerefentry"><span class="refentrytitle">glBlendEquation</span></span></a>, | |
| 31 | <a class="citerefentry" href="glBlendFunc.xml"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>, | |
| 32 | <a class="citerefentry" href="glGetString.xml"><span class="citerefentry"><span class="refentrytitle">glGetString</span></span></a> | |
| 33 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
| 34 | Copyright <span class="trademark"></span>© 1991-2006 | |
| 35 | Silicon Graphics, Inc. This document is licensed under the SGI | |
| 36 | Free Software B License. For details, see | |
| 37 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
| 38 | </p></div></div></body></html> |