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195 lines
9.3 KiB
XML
195 lines
9.3 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glBeginTransformFeedback">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>2010</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glBeginTransformFeedback</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glBeginTransformFeedback</refname>
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<refpurpose>start transform feedback operation</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glBeginTransformFeedback</function></funcdef>
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<paramdef>GLenum <parameter>primitiveMode</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>primitiveMode</parameter></term>
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<listitem>
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<para>
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Specify the output type of the primitives that will be recorded into the
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buffer objects that are bound for transform feedback.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glEndTransformFeedback</function></funcdef>
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<paramdef><parameter>void</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="description"><title>Description</title>
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<para>
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Transform feedback mode captures the values of varying variables written by the vertex shader (or, if active, the geometry shader).
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Transform feedback is said to be active after a call to <function>glBeginTransformFeedback</function>
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until a subsequent call to <citerefentry><refentrytitle>glEndTransformFeedback</refentrytitle></citerefentry>.
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Transform feedback commands must be paired.
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</para>
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<para>
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If no geometry shader is present, while transform feedback is active the <parameter>mode</parameter> parameter to
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry> must match those specified
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in the following table:
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</para>
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<informaltable frame="topbot">
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<tgroup cols="2" align="left">
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<colspec colwidth="1.1*" />
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<colspec colwidth="1*" />
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<thead>
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<row>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Transform Feedback <parameter>primitiveMode</parameter>
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</emphasis></entry>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Allowed Render Primitive <parameter>modes</parameter>
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</emphasis></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry align="left">
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<constant>GL_POINTS</constant>
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</entry>
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<entry align="left">
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<constant>GL_POINTS</constant>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_LINES</constant>
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</entry>
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<entry align="left">
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<constant>GL_LINES</constant>, <constant>GL_LINE_LOOP</constant>, <constant>GL_LINE_STRIP</constant>,
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<constant>GL_LINES_ADJACENCY</constant>, <constant>GL_LINE_STRIP_ADJACENCY</constant>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_TRIANGLES</constant>
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</entry>
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<entry align="left">
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<constant>GL_TRIANGLES</constant>, <constant>GL_TRIANGLE_STRIP</constant>, <constant>GL_TRIANGLE_FAN</constant>,
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<constant>GL_TRIANGLES_ADJACENCY</constant>, <constant>GL_TRIANGLE_STRIP_ADJACENCY</constant>
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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If a geometry shader is present, the output primitive type from the geometry shader must match those
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provided in the following table:
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<informaltable frame="topbot">
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<tgroup cols="2" align="left">
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<colspec colwidth="1.1*" />
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<colspec colwidth="1*" />
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<thead>
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<row>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Transform Feedback <parameter>primitiveMode</parameter>
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</emphasis></entry>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Allowed Geometry Shader Output Primitive Type
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</emphasis></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry align="left">
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<constant>GL_POINTS</constant>
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</entry>
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<entry align="left">
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<constant>points</constant>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_LINES</constant>
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</entry>
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<entry align="left">
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<constant>line_strip</constant>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_TRIANGLES</constant>
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</entry>
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<entry align="left">
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<constant>triangle_strip</constant>
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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Geometry shaders, and the <constant>GL_TRIANGLES_ADJACENCY</constant>, <constant>GL_TRIANGLE_STRIP_ADJACENCY</constant>,
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<constant>GL_LINES_ADJACENCY</constant> and <constant>GL_LINE_STRIP_ADJACENCY</constant> primtive modes are available
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only if the GL version is 3.2 or greater.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glBeginTransformFeedback</function> is executed
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while transform feedback is active.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glEndTransformFeedback</function> is executed
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while transform feedback is not active.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>
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if no geometry shader is present, transform feedback is active and <parameter>mode</parameter> is not one of the allowed modes.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>
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if a geometry shader is present, transform feedback is active and the output primitive type of the geometry shader does not
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match the transform feedback <parameter>primitiveMode</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <function>glEndTransformFeedback</function> if any binding
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point used in transform feedback mode does not have a buffer object bound.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <function>glEndTransformFeedback</function> if no binding
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points would be used, either because no program object is active of because the active program object has specified
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no varying variables to record.
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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