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242 lines
8.5 KiB
XML
242 lines
8.5 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="glGetProgram">
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<refmeta>
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<refentrytitle>glGetProgram</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetProgramiv</refname>
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<refpurpose>Returns a parameter from 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>glGetProgramiv</function></funcdef>
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<paramdef>GLuint <parameter>program</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint *<parameter>params</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 program object to be
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queried.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>pname</parameter></term>
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<listitem>
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<para>Specifies the object parameter. Accepted
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symbolic names are
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<constant>GL_DELETE_STATUS</constant>,
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<constant>GL_LINK_STATUS</constant>,
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<constant>GL_VALIDATE_STATUS</constant>,
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<constant>GL_INFO_LOG_LENGTH</constant>,
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<constant>GL_ATTACHED_SHADERS</constant>,
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<constant>GL_ACTIVE_ATTRIBUTES</constant>,
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<constant>GL_ACTIVE_ATTRIBUTE_MAX_LENGTH</constant>,
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<constant>GL_ACTIVE_UNIFORMS</constant>,
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<constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>params</parameter></term>
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<listitem>
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<para>Returns the requested object parameter.</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>glGetProgram</function>
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returns in <parameter>params</parameter>
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the value of a parameter for a specific program object. The following parameters are defined:</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_DELETE_STATUS</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns
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<constant>GL_TRUE</constant> if
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<parameter>program</parameter> is currently flagged
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for deletion, and <constant>GL_FALSE</constant>
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otherwise.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_LINK_STATUS</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns
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<constant>GL_TRUE</constant> if the last link
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operation on <parameter>program</parameter> was
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successful, and <constant>GL_FALSE</constant>
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otherwise.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_VALIDATE_STATUS</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns
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<constant>GL_TRUE</constant> or if the last
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validation operation on
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<parameter>program</parameter> was successful, and
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<constant>GL_FALSE</constant>
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otherwise.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_INFO_LOG_LENGTH</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns the
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number of characters in the information log for
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<parameter>program</parameter> including the null
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termination character (i.e., the size of the
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character buffer required to store the information
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log). If <parameter>program</parameter> has no
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information log, a value of 0 is
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returned.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_ATTACHED_SHADERS</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns the
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number of shader objects attached to
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<parameter>program</parameter>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_ACTIVE_ATTRIBUTES</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns the
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number of active attribute variables for
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<parameter>program</parameter>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_ACTIVE_ATTRIBUTE_MAX_LENGTH</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns the
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length of the longest active attribute name for
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<parameter>program</parameter>, including the null
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termination character (i.e., the size of the
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character buffer required to store the longest
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attribute name). If no active attributes exist, 0 is
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returned.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_ACTIVE_UNIFORMS</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns the
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number of active uniform variables for
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<parameter>program</parameter>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant></term>
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<listitem>
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<para>
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</para>
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<para> <parameter>params</parameter> returns the
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length of the longest active uniform variable name
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for <parameter>program</parameter>, including the
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null termination character (i.e., the size of the
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character buffer required to store the longest
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uniform variable name). If no active uniform
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variables exist, 0 is returned.</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="notes"><title>Notes</title>
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<para><function>glGetProgram</function> is available only if the
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GL version is 2.0 or greater.</para>
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<para>If an error is generated, no change is made to the
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contents of <parameter>params</parameter>.</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>
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is generated if <parameter>program</parameter>
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is not a value generated by OpenGL.</para>
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<para><constant>GL_INVALID_OPERATION</constant>
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is generated if <parameter>program</parameter>
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does not refer to a program object.</para>
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<para><constant>GL_INVALID_ENUM</constant>
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is generated if <parameter>pname</parameter>
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is not an accepted value.</para>
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<para><constant>GL_INVALID_OPERATION</constant> is generated if
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<function>glGetProgram</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>glGetActiveAttrib</refentrytitle></citerefentry>
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with argument <parameter>program</parameter></para>
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<para><citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>
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with argument <parameter>program</parameter></para>
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<para><citerefentry><refentrytitle>glGetAttachedShaders</refentrytitle></citerefentry>
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with argument <parameter>program</parameter></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>
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<parameter></parameter></para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para><citerefentry><refentrytitle>glAttachShader</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCreateProgram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetShader</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glValidateProgram</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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