| 1 | <?xml version="1.0" encoding="UTF-8"?>\r |
| 2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"\r |
| 3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">\r |
| 4 | <refentry id="gl_FragDepth">\r |
| 5 | <refmeta>\r |
| 6 | <refmetainfo>\r |
| 7 | <copyright>\r |
| 8 | <year>2011</year>\r |
| 9 | <holder>Khronos Group</holder>\r |
| 10 | </copyright>\r |
| 11 | </refmetainfo>\r |
| 12 | <refentrytitle>gl_FragDepth</refentrytitle>\r |
| 13 | <manvolnum>3G</manvolnum>\r |
| 14 | </refmeta>\r |
| 15 | <refnamediv>\r |
| 16 | <refname>gl_FragDepth</refname>\r |
| 17 | <refpurpose>establishes a depth value for the current fragment</refpurpose>\r |
| 18 | </refnamediv>\r |
| 19 | <refsynopsisdiv><title>Declaration</title>\r |
| 20 | <funcsynopsis>\r |
| 21 | <function>out float gl_FragDepth;</function>\r |
| 22 | </funcsynopsis>\r |
| 23 | </refsynopsisdiv>\r |
| 24 | <refsect1 id="description"><title>Description</title>\r |
| 25 | <para>\r |
| 26 | Available only in the fragment language, <function>gl_FragDepth</function> is an output variable\r |
| 27 | that is used to establish the depth value for the current fragment. If depth buffering is enabled\r |
| 28 | and no shader writes to <function>gl_FragDepth</function>, then the fixed function value for\r |
| 29 | depth will be used (this value is contained in the z component of <citerefentry><refentrytitle>gl_FragCoord</refentrytitle></citerefentry>)\r |
| 30 | otherwise, the value written to <function>gl_FragDepth</function> is used.\r |
| 31 | If a shader statically assigns to <function>gl_FragDepth</function>, then the value of the fragment's depth\r |
| 32 | may be undefined for executions of the shader that take that path. That is, if the set of linked fragment\r |
| 33 | shaders statically contain a write to <function>gl_FragDepth</function>, then it is responsible for always\r |
| 34 | writing it.\r |
| 35 | </para>\r |
| 36 | </refsect1>\r |
| 37 | <refsect1 id="versions"><title>Version Support</title>\r |
| 38 | <informaltable frame="topbot">\r |
| 39 | #VARTABLECOLS#\r |
| 40 | <thead>\r |
| 41 | #VARTABLEHEADER#\r |
| 42 | <row>\r |
| 43 | <entry>gl_FragDepth</entry>#newin11#\r |
| 44 | </row>\r |
| 45 | </thead>\r |
| 46 | </tgroup>\r |
| 47 | </informaltable>\r |
| 48 | </refsect1>\r |
| 49 | <refsect1 id="seealso"><title>See Also</title>\r |
| 50 | <para>\r |
| 51 | <citerefentry><refentrytitle>gl_FragCoord</refentrytitle></citerefentry>\r |
| 52 | </para>\r |
| 53 | </refsect1>\r |
| 54 | <refsect1 id="Copyright"><title>Copyright</title>\r |
| 55 | <para>\r |
| 56 | Copyright <trademark class="copyright"></trademark> 2011 Khronos Group. \r |
| 57 | This material may be distributed subject to the terms and conditions set forth in \r |
| 58 | the Open Publication License, v 1.0, 8 June 1999.\r |
| 59 | <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.\r |
| 60 | </para>\r |
| 61 | </refsect1>\r |
| 62 | </refentry>\r |