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143 lines
6.1 KiB
XML
143 lines
6.1 KiB
XML
<?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="glValidateProgram">
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<refmeta>
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<refentrytitle>glValidateProgram</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glValidateProgram</refname>
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<refpurpose>Validates a program object</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>glValidateProgram</function></funcdef>
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<paramdef>GLuint <parameter>program</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>program</parameter></term>
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<listitem>
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<para>Specifies the handle of the program object to
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be validated.</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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<refsect1 id="description"><title>Description</title>
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<para><function>glValidateProgram</function> checks to see
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whether the executables contained in
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<parameter>program</parameter> can execute given the current
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OpenGL state. The information generated by the validation
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process will be stored in <parameter>program</parameter>'s
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information log. The validation information may consist of an
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empty string, or it may be a string containing information about
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how the current program object interacts with the rest of
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current OpenGL state. This provides a way for OpenGL
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implementers to convey more information about why the current
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program is inefficient, suboptimal, failing to execute, and so
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on.</para>
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<para>The status of the validation operation will be stored as
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part of the program object's state. This value will be set to
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<constant>GL_TRUE</constant> if the validation succeeded, and
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<constant>GL_FALSE</constant> otherwise. It can be queried by
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calling
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<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
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with arguments <parameter>program</parameter> and
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<constant>GL_VALIDATE_STATUS</constant>. If validation is
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successful, <parameter>program</parameter> is guaranteed to
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execute given the current state. Otherwise,
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<parameter>program</parameter> is guaranteed to not execute.</para>
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<para>This function is typically useful only during application
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development. The informational string stored in the information
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log is completely implementation dependent; therefore, an
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application should not expect different OpenGL implementations
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to produce identical information strings.</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para><function>glValidateProgram</function> is available only
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if the GL version is 2.0 or greater.</para>
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<para>This function mimics the validation operation that OpenGL
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implementations must perform when rendering commands are issued
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while programmable shaders are part of current state. The error
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<constant>GL_INVALID_OPERATION</constant> will be generated by
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<citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glRasterPos</refentrytitle></citerefentry>,
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or any command that performs an implicit call to
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<citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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if:</para>
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<itemizedlist>
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<listitem>
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<para>any two active samplers in the current program
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object are of different types, but refer to the same
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texture image unit,</para>
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</listitem>
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<listitem>
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<para>any active sampler in the current program object
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refers to a texture image unit where fixed-function
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fragment processing accesses a texture target that does
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not match the sampler type, or</para>
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</listitem>
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<listitem>
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<para>the sum of the number of active samplers in the
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program and the number of texture image units enabled
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for fixed-function fragment processing exceeds the
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combined limit on the total number of texture image
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units allowed.</para>
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</listitem>
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</itemizedlist>
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<para>It may be difficult or cause a performance degradation for
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applications to catch these errors when rendering commands are
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issued. Therefore, applications are advised to make calls to
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<function>glValidateProgram</function> to detect these issues
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during application development.</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para><constant>GL_INVALID_VALUE</constant> is generated if
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<parameter>program</parameter> is not a value generated by
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OpenGL.</para>
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<para><constant>GL_INVALID_OPERATION</constant> is generated if
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<parameter>program</parameter> is not a program object.</para>
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<para><constant>GL_INVALID_OPERATION</constant> is generated if
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<function>glValidateProgram</function> is executed between the
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execution of
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<citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of
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<citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para><citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
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with arguments <parameter>program</parameter> and
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<constant>GL_VALIDATE_STATUS</constant></para>
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<para><citerefentry><refentrytitle>glGetProgramInfoLog</refentrytitle></citerefentry>
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with argument <parameter>program</parameter></para>
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<para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para><citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry></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> 2003-2005 3Dlabs Inc. Ltd.
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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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