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243 lines
12 KiB
XML
243 lines
12 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetProgramInterface">
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<info>
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<copyright>
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<year>2012-2014</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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<refmeta>
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<refentrytitle>glGetProgramInterface</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetProgramInterface</refname>
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<refpurpose>query a property of an interface in a program</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetProgramInterfaceiv</function></funcdef>
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<paramdef>GLuint <parameter>program</parameter></paramdef>
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<paramdef>GLenum <parameter>programInterface</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 xml: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>
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The name of a program object whose interface to query.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>programInterface</parameter></term>
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<listitem>
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<para>
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A token identifying the interface within <parameter>program</parameter> to query.
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</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>
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The name of the parameter within <parameter>programInterface</parameter> to query.
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</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>
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The address of a variable to retrieve the value of <parameter>pname</parameter> for the program interface.
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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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<refsect1 xml:id="description"><title>Description</title>
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<para>
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<function>glGetProgramInterfaceiv</function> queries the property of the interface identifed
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by <parameter>programInterface</parameter> in <parameter>program</parameter>, the property name of
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which is given by <parameter>pname</parameter>.
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</para>
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<para>
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<parameter>program</parameter> must be the name of an existing program object. <parameter>programInterface</parameter>
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is the name of the interface within <parameter>program</parameter> to query and must be one of the following
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values:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_UNIFORM</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active uniforms within <parameter>program</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_UNIFORM_BLOCK</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active uniform blocks within <parameter>program</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_ATOMIC_COUNTER_BUFFER</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active atomic counter buffer binding points within <parameter>program</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PROGRAM_INPUT</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active input variables used by the first shader stage of <parameter>program</parameter>.
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If <parameter>program</parameter> contains multiple shader stages then input variables from any stage other than the first
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will not be enumerated.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PROGRAM_OUTPUT</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active output variables produced by the last shader stage of <parameter>program</parameter>.
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If <parameter>program</parameter> contains multiple shader stages then output variables from any stage other than the last
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will not be enumerated.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TRANSFORM_FEEDBACK_VARYING</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of output variables from the last non-fragment stage of <parameter>program</parameter> that would be
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captured if transform feedback were active.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_BUFFER_VARIABLE</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active buffer variables used by <parameter>program</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_SHADER_STORAGE_BLOCK</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active shader storage blocks used by <parameter>program</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant></term>
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<listitem>
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<para>
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The query is targeted at the set of active buffer binding points to which output variables in the
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<constant>GL_TRANSFORM_FEEDBACK_VARYING</constant> interface are written.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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<parameter>pname</parameter> identifies the property of <parameter>programInterface</parameter>
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to return in <parameter>params</parameter>.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_ACTIVE_RESOURCES</constant>, the value returned is the number of
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resources in the active resource list for <parameter>programInterface</parameter>. If the list
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of active resources for <parameter>programInterface</parameter> is empty, zero is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_MAX_NAME_LENGTH</constant>, the value returned is the length of the
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longest active name string for an active resource in <parameter>programInterface</parameter>.
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This length includes an extra character for the null terminator. If the
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list of active resources for <parameter>programInterface</parameter> is empty, zero is
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returned. It is an error to specify <constant>GL_MAX_NAME_LENGTH</constant> when <parameter>programInterface</parameter>
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is <constant>GL_ATOMIC_COUNTER_BUFFER</constant>, as active atomic counter buffer resources are
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not assigned name strings.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_MAX_NUM_ACTIVE_VARIABLES</constant>, the value returned is the number
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of active variables belonging to the interface block or atomic counter
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buffer resource in <parameter>programInterface</parameter> with the most active variables. If
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the list of active resources for <parameter>programInterface</parameter> is empty, zero is
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returned. When <parameter>pname</parameter> is <constant>GL_MAX_NUM_ACTIVE_VARIABLES</constant>, <parameter>programInterface</parameter>
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must be <constant>GL_UNIFORM_BLOCK</constant>, <constant>GL_ATOMIC_COUNTER_BUFFER</constant>, or <constant>GL_SHADER_STORAGE_BLOCK</constant>.
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</para>
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</refsect1>
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<refsect1 xml:id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>identifier</parameter>
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is not one of the accepted object types.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>program</parameter>
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is not the name of an existing program object.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>pname</parameter> is <constant>GL_MAX_NAME_LENGTH</constant> and
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<parameter>programInterface</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER</constant> or <constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant>,
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since active atomic counter and transform feedback buffer resources are not assigned name strings.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> error is generated if <parameter>pname</parameter> is
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<constant>GL_MAX_NUM_ACTIVE_VARIABLES</constant> and <parameter>programInterface</parameter> is not <constant>GL_UNIFORM_BLOCK</constant>,
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<constant>GL_SHADER_STORAGE_BLOCK</constant>, <constant>GL_ATOMIC_COUNTER_BUFFER</constant>, or
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<constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant>.
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</para>
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</refsect1>
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<refsect1 xml:id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_LABEL_LENGTH</constant>.
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</para>
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</refsect1>
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<refsect1 xml:id="versions">
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<title>API Version Support</title>
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<informaltable>
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<tgroup cols="4" align="left">
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
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<tbody>
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<row>
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<entry><function>glGetProgramInterfaceiv</function></entry>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es31']/*)"/>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 xml:id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glGetProgramResourceName</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetProgramResourceIndex</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetProgramResourceLocation</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetProgramResourceiv</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 2012-2014 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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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
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</para>
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</refsect1>
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</refentry>
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