mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-24 13:25:28 +00:00
283 lines
15 KiB
XML
283 lines
15 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="glBufferStorage">
|
|
<refentryinfo>
|
|
<copyright>
|
|
<year>2013</year>
|
|
<holder>Khronos Group</holder>
|
|
</copyright>
|
|
</refentryinfo>
|
|
<refmeta>
|
|
<refentrytitle>glBufferStorage</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glBufferStorage</refname>
|
|
<refpurpose>creates and initializes a buffer object's immutable data store</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glBufferStorage</function></funcdef>
|
|
<paramdef>GLenum <parameter>target</parameter></paramdef>
|
|
<paramdef>GLsizeiptr <parameter>size</parameter></paramdef>
|
|
<paramdef>const GLvoid * <parameter>data</parameter></paramdef>
|
|
<paramdef>GLbitfield <parameter>flags</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>target</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the target buffer object.
|
|
The symbolic constant must be
|
|
<constant>GL_ARRAY_BUFFER</constant>,
|
|
<constant>GL_ATOMIC_COUNTER_BUFFER</constant>,
|
|
<constant>GL_COPY_READ_BUFFER</constant>,
|
|
<constant>GL_COPY_WRITE_BUFFER</constant>,
|
|
<constant>GL_DRAW_INDIRECT_BUFFER</constant>,
|
|
<constant>GL_DISPATCH_INDIRECT_BUFFER</constant>,
|
|
<constant>GL_ELEMENT_ARRAY_BUFFER</constant>,
|
|
<constant>GL_PIXEL_PACK_BUFFER</constant>,
|
|
<constant>GL_PIXEL_UNPACK_BUFFER</constant>,
|
|
<constant>GL_QUERY_BUFFER</constant>,
|
|
<constant>GL_SHADER_STORAGE_BUFFER</constant>,
|
|
<constant>GL_TEXTURE_BUFFER</constant>,
|
|
<constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant>, or
|
|
<constant>GL_UNIFORM_BUFFER</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>size</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the size in bytes of the buffer object's new data store.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>data</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies a pointer to data that will be copied into the data store for initialization,
|
|
or <constant>NULL</constant> if no data is to be copied.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>flags</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the intended usage of the buffer's data store. Must be a bitwise combination
|
|
of the following flags. <constant>GL_DYNAMIC_STORAGE_BIT</constant>, <constant>GL_MAP_READ_BIT</constant>
|
|
<constant>GL_MAP_WRITE_BIT</constant>, <constant>GL_MAP_PERSISTENT_BIT</constant>, <constant>GL_MAP_COHERENT_BIT</constant>,
|
|
and <constant>GL_CLIENT_STORAGE_BIT</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glBufferStorage</function> creates a new immutable data store for the buffer object currently bound to
|
|
<parameter>target</parameter>. The size of the data store is specified by <parameter>size</parameter>. If
|
|
an initial data is available, its address may be supplied in <parameter>data</parameter>. Otherwise, to
|
|
create an uninitialized data store, <parameter>data</parameter> should be <constant>NULL</constant>.
|
|
</para>
|
|
<para>
|
|
The <parameter>flags</parameter> parameters specifies the intended usage of the buffer's data store.
|
|
It must be a bitwise combination of a subset of the following flags:
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><constant>GL_DYNAMIC_STORAGE_BIT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
The contents of the data store may be
|
|
updated after creation through calls to <citerefentry><refentrytitle>glBufferSubData</refentrytitle></citerefentry>.
|
|
If this bit is not set, the buffer content may not be directly updated by the client. The data argument
|
|
may be used to specify the initial content of the buffer's data store regardless of the presence of
|
|
the <constant>GL_DYNAMIC_STORAGE_BIT</constant>. Regardless of the presence of this bit,
|
|
buffers may always be updated with server-side calls such as
|
|
<citerefentry><refentrytitle>glCopyBufferSubData</refentrytitle></citerefentry> and
|
|
<citerefentry><refentrytitle>glClearBufferSubData</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAP_READ_BIT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
The data store may be mapped by the client for
|
|
read access and a pointer in the client's address space obtained that may be read from.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAP_WRITE_BIT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
The data store may be mapped by the client for
|
|
write access and a pointer in the client's address space obtained that may be written through.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAP_PERSISTENT_BIT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
The client may request that the server read
|
|
from or write to the buffer while it is mapped. The client's pointer to the data store remains
|
|
valid so long as the data store is mapped, even during execution of drawing or dispatch commands.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAP_COHERENT_BIT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Shared access to buffers that are simultaneously
|
|
mapped for client access and are used by the server will be coherent, so long as that
|
|
mapping is performed using <citerefentry><refentrytitle>glMapBufferRange</refentrytitle></citerefentry>.
|
|
That is, data written to the store by either the client or server will be immediately visible to
|
|
the other with no further action taken by the application. In particular,
|
|
</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>
|
|
If <constant>GL_MAP_COHERENT_BIT</constant> is not set and the client performs a write
|
|
followed by a call to the <citerefentry><refentrytitle>glMemoryBarrier</refentrytitle></citerefentry>
|
|
command with the <constant>GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT</constant> set, then in subsequent
|
|
commands the server will see the writes.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
If <constant>GL_MAP_COHERENT_BIT</constant> is set and the client performs a write, then in
|
|
subsequent commands the server will see the writes.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
If <constant>GL_MAP_COHERENT_BIT</constant> is not set and the server performs a write, the
|
|
application must call <citerefentry><refentrytitle>glMemoryBarrier</refentrytitle></citerefentry>
|
|
with the <constant>GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT</constant> set and then call
|
|
<citerefentry><refentrytitle>glFenceSync</refentrytitle></citerefentry> with
|
|
<constant>GL_SYNC_GPU_COMMANDS_COMPLETE</constant> (or <constant>glFinish</constant>).
|
|
Then the CPU will see the writes after the sync is complete.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
If <constant>GL_MAP_COHERENT_BIT</constant> is set and the server does a write, the app must
|
|
call FenceSync with <constant>GL_SYNC_GPU_COMMANDS_COMPLETE</constant> (or <citerefentry><refentrytitle>glFinish</refentrytitle></citerefentry>).
|
|
Then the CPU will see the writes after the sync is complete.
|
|
</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_CLIENT_STORAGE_BIT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When all other criteria for the buffer storage
|
|
allocation are met, this bit may be used by an
|
|
implementation to determine whether to use
|
|
storage that is local to the server or to the
|
|
client to serve as the backing store for the
|
|
buffer.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
The allowed combinations of flags are subject to certain restrictions. They are as follows:
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>
|
|
If <parameter>flags</parameter> contains <constant>GL_MAP_PERSISTENT_BIT</constant>, it
|
|
must also contain at least one of <constant>GL_MAP_READ_BIT</constant> or <constant>GL_MAP_WRITE_BIT</constant>.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
If <parameter>flags</parameter> contains <constant>GL_MAP_COHERENT_BIT</constant>, it must
|
|
also contain <constant>GL_MAP_PERSISTENT_BIT</constant>.
|
|
</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
<function>glBufferStorage</function> is available only if the GL version is 4.4 or greater.
|
|
</para>
|
|
<para>
|
|
If <parameter>data</parameter> is <constant>NULL</constant>, a data store of the specified size is still created,
|
|
but its contents remain uninitialized and thus undefined.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not
|
|
one of the accepted buffer targets.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>size</parameter> is less than or equal to zero.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if the reserved buffer object name 0 is bound to <parameter>target</parameter>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_OUT_OF_MEMORY</constant> is generated if the GL is unable to create a
|
|
data store with the properties requested in <parameter>flags</parameter>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if flags has any bits set other than
|
|
those defined above.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> error is generated if <parameter>flags</parameter> contains <constant>GL_MAP_PERSISTENT_BIT</constant>
|
|
but does not contain at least one of <constant>GL_MAP_READ_BIT</constant> or <constant>GL_MAP_WRITE_BIT</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>flags</parameter> contains <constant>GL_MAP_COHERENT_BIT</constant>, but
|
|
does not also contain <constant>GL_MAP_PERSISTENT_BIT</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if the <constant>GL_BUFFER_IMMUTABLE_STORAGE</constant> flag of the buffer
|
|
bound to <parameter>target</parameter> is <constant>GL_TRUE</constant>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGetBufferSubData</refentrytitle></citerefentry>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGetBufferParameter</refentrytitle></citerefentry> with argument <constant>GL_BUFFER_SIZE</constant> or <constant>GL_BUFFER_USAGE</constant>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glBufferSubData</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glMapBuffer</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glUnmapBuffer</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 2013 Khronos Group.
|
|
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>
|