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