mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-26 20:05:37 +00:00
224 lines
11 KiB
XML
224 lines
11 KiB
XML
|
<?xml version="1.0" encoding="UTF-8"?>
|
||
|
|
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
|
||
|
|
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
|
||
|
|
<refentry id="glLinkProgram">
|
||
|
|
<refmeta>
|
||
|
|
<refentrytitle>glLinkProgram</refentrytitle>
|
||
|
|
<manvolnum>3G</manvolnum>
|
||
|
|
</refmeta>
|
||
|
|
<refnamediv>
|
||
|
|
<refname>glLinkProgram</refname>
|
||
|
|
<refpurpose>Links a program object</refpurpose>
|
||
|
|
</refnamediv>
|
||
|
|
<refsynopsisdiv><title>C Specification</title>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glLinkProgram</function></funcdef>
|
||
|
|
<paramdef>GLuint <parameter>program</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
</refsynopsisdiv>
|
||
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
||
|
|
<variablelist>
|
||
|
|
<varlistentry>
|
||
|
|
<term><parameter>program</parameter></term>
|
||
|
|
<listitem>
|
||
|
|
<para>Specifies the handle of the program object to be linked.</para>
|
||
|
|
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
</variablelist>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="description"><title>Description</title>
|
||
|
|
<para><function>glLinkProgram</function> links the program
|
||
|
|
object specified by <parameter>program</parameter>. If any
|
||
|
|
shader objects of type <constant>GL_VERTEX_SHADER</constant> are
|
||
|
|
attached to <parameter>program</parameter>, they will be used to
|
||
|
|
create an executable that will run on the programmable vertex
|
||
|
|
processor. If any shader objects of type
|
||
|
|
<constant>GL_FRAGMENT_SHADER</constant> are attached to
|
||
|
|
<parameter>program</parameter>, they will be used to create an
|
||
|
|
executable that will run on the programmable fragment
|
||
|
|
processor.</para>
|
||
|
|
|
||
|
|
<para>The status of the link operation will be stored as part of
|
||
|
|
the program object's state. This value will be set to
|
||
|
|
<constant>GL_TRUE</constant> if the program object was linked
|
||
|
|
without errors and is ready for use, and
|
||
|
|
<constant>GL_FALSE</constant> otherwise. It can be queried by
|
||
|
|
calling
|
||
|
|
<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
|
||
|
|
with arguments <parameter>program</parameter> and
|
||
|
|
<constant>GL_LINK_STATUS</constant>.</para>
|
||
|
|
|
||
|
|
<para>As a result of a successful link operation, all active
|
||
|
|
user-defined uniform variables belonging to
|
||
|
|
<parameter>program</parameter> will be initialized to 0, and
|
||
|
|
each of the program object's active uniform variables will be
|
||
|
|
assigned a location that can be queried by calling
|
||
|
|
<citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>.
|
||
|
|
Also, any active user-defined attribute variables that have not
|
||
|
|
been bound to a generic vertex attribute index will be bound to
|
||
|
|
one at this time.</para>
|
||
|
|
|
||
|
|
<para>Linking of a program object can fail for a number of
|
||
|
|
reasons as specified in the <emphasis>OpenGL Shading Language
|
||
|
|
Specification</emphasis>. The following lists some of the
|
||
|
|
conditions that will cause a link error.</para>
|
||
|
|
|
||
|
|
<itemizedlist>
|
||
|
|
<listitem>
|
||
|
|
<para>The number of active attribute variables supported
|
||
|
|
by the implementation has been exceeded.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>The storage limit for uniform variables has been
|
||
|
|
exceeded.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>The number of active uniform variables supported
|
||
|
|
by the implementation has been exceeded.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>The <function>main</function> function is missing
|
||
|
|
for the vertex shader or the fragment shader.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>A varying variable actually used in the fragment
|
||
|
|
shader is not declared in the same way (or is not
|
||
|
|
declared at all) in the vertex shader.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>A reference to a function or variable name is
|
||
|
|
unresolved.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>A shared global is declared with two different
|
||
|
|
types or two different initial values.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>One or more of the attached shader objects has not
|
||
|
|
been successfully compiled.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>Binding a generic attribute matrix caused some
|
||
|
|
rows of the matrix to fall outside the allowed maximum
|
||
|
|
of <constant>GL_MAX_VERTEX_ATTRIBS</constant>.</para>
|
||
|
|
</listitem>
|
||
|
|
<listitem>
|
||
|
|
<para>Not enough contiguous vertex attribute slots could
|
||
|
|
be found to bind attribute matrices.</para>
|
||
|
|
</listitem>
|
||
|
|
</itemizedlist>
|
||
|
|
|
||
|
|
<para>When a program object has been successfully linked, the
|
||
|
|
program object can be made part of current state by calling
|
||
|
|
<citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>.
|
||
|
|
Whether or not the link operation was successful, the program
|
||
|
|
object's information log will be overwritten. The information
|
||
|
|
log can be retrieved by calling
|
||
|
|
<citerefentry><refentrytitle>glGetProgramInfoLog</refentrytitle></citerefentry>.</para>
|
||
|
|
|
||
|
|
<para><function>glLinkProgram</function> will also install the
|
||
|
|
generated executables as part of the current rendering state if
|
||
|
|
the link operation was successful and the specified program
|
||
|
|
object is already currently in use as a result of a previous
|
||
|
|
call to
|
||
|
|
<citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>.
|
||
|
|
If the program object currently in use is relinked
|
||
|
|
unsuccessfully, its link status will be set to
|
||
|
|
<constant>GL_FALSE</constant> , but the executables and
|
||
|
|
associated state will remain part of the current state until a
|
||
|
|
subsequent call to <function>glUseProgram</function> removes it
|
||
|
|
from use. After it is removed from use, it cannot be made part
|
||
|
|
of current state until it has been successfully relinked.</para>
|
||
|
|
|
||
|
|
<para>If <parameter>program</parameter> contains shader objects
|
||
|
|
of type <constant>GL_VERTEX_SHADER</constant> but does not
|
||
|
|
contain shader objects of type
|
||
|
|
<constant>GL_FRAGMENT_SHADER</constant>, the vertex shader will
|
||
|
|
be linked against the implicit interface for fixed functionality
|
||
|
|
fragment processing. Similarly, if
|
||
|
|
<parameter>program</parameter> contains shader objects of type
|
||
|
|
<constant>GL_FRAGMENT_SHADER</constant> but it does not contain
|
||
|
|
shader objects of type <constant>GL_VERTEX_SHADER</constant>,
|
||
|
|
the fragment shader will be linked against the implicit
|
||
|
|
interface for fixed functionality vertex processing.</para>
|
||
|
|
|
||
|
|
<para>The program object's information log is updated and the
|
||
|
|
program is generated at the time of the link operation. After
|
||
|
|
the link operation, applications are free to modify attached
|
||
|
|
shader objects, compile attached shader objects, detach shader
|
||
|
|
objects, delete shader objects, and attach additional shader
|
||
|
|
objects. None of these operations affects the information log or
|
||
|
|
the program that is part of the program object.</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="notes"><title>Notes</title>
|
||
|
|
<para><function>glLinkProgram</function>
|
||
|
|
is available only if the GL version is 2.0 or greater.</para>
|
||
|
|
<para>If the link operation is unsuccessful, any information about a previous link operation on <parameter>program</parameter>
|
||
|
|
is lost (i.e., a failed link does not restore the old state of <parameter>program</parameter>
|
||
|
|
). Certain information can still be retrieved from <parameter>program</parameter>
|
||
|
|
even after an unsuccessful link operation. See for instance <citerefentry><refentrytitle>glGetActiveAttrib</refentrytitle></citerefentry>
|
||
|
|
and <citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>.</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="errors"><title>Errors</title>
|
||
|
|
<para><constant>GL_INVALID_VALUE</constant>
|
||
|
|
is generated if <parameter>program</parameter>
|
||
|
|
is not a value generated by OpenGL.</para>
|
||
|
|
<para><constant>GL_INVALID_OPERATION</constant>
|
||
|
|
is generated if <parameter>program</parameter>
|
||
|
|
is not a program object.</para>
|
||
|
|
<para><constant>GL_INVALID_OPERATION</constant>
|
||
|
|
is generated if <function>glLinkProgram</function>
|
||
|
|
is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
|
||
|
|
and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
||
|
|
<para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
|
||
|
|
with the argument <constant>GL_CURRENT_PROGRAM</constant></para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetActiveAttrib</refentrytitle></citerefentry>
|
||
|
|
with argument <parameter>program</parameter>
|
||
|
|
and the index of an active attribute variable</para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>
|
||
|
|
with argument <parameter>program</parameter>
|
||
|
|
and the index of an active uniform variable<parameter></parameter></para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetAttachedShaders</refentrytitle></citerefentry>
|
||
|
|
with argument <parameter>program</parameter></para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetAttribLocation</refentrytitle></citerefentry>
|
||
|
|
with argument <parameter>program</parameter>
|
||
|
|
and an attribute variable name</para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
|
||
|
|
with arguments <parameter>program</parameter>
|
||
|
|
and <constant>GL_LINK_STATUS</constant></para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetProgramInfoLog</refentrytitle></citerefentry>
|
||
|
|
with argument <parameter>program</parameter></para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>
|
||
|
|
with argument <parameter>program</parameter>
|
||
|
|
and a uniform variable location</para>
|
||
|
|
<para><citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>
|
||
|
|
with argument <parameter>program</parameter>
|
||
|
|
and a uniform variable name</para>
|
||
|
|
<para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="seealso"><title>See Also</title>
|
||
|
|
<para><citerefentry><refentrytitle>glAttachShader</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glBindAttribLocation</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glCompileShader</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glCreateProgram</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glDetachShader</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glValidateProgram</refentrytitle></citerefentry></para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
||
|
|
<para>
|
||
|
|
Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd.
|
||
|
|
This material may be distributed subject to the terms and conditions set forth in
|
||
|
|
the Open Publication License, v 1.0, 8 June 1999.
|
||
|
|
<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
</refentry>
|