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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<!-- Converted by db4-upgrade version 1.1 -->
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glCopyTexSubImage1D">
<info>
<copyright>
<year>2014</year>
<holder>Khronos Group</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>glCopyTexSubImage1D</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glCopyTexSubImage1D</refname>
<refname>glCopyTextureSubImage1D</refname>
<refpurpose>copy a one-dimensional texture subimage</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glCopyTexSubImage1D</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLint <parameter>level</parameter></paramdef>
<paramdef>GLint <parameter>xoffset</parameter></paramdef>
<paramdef>GLint <parameter>x</parameter></paramdef>
<paramdef>GLint <parameter>y</parameter></paramdef>
<paramdef>GLsizei <parameter>width</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glCopyTextureSubImage1D</function></funcdef>
<paramdef>GLuint <parameter>texture</parameter></paramdef>
<paramdef>GLint <parameter>level</parameter></paramdef>
<paramdef>GLint <parameter>xoffset</parameter></paramdef>
<paramdef>GLint <parameter>x</parameter></paramdef>
<paramdef>GLint <parameter>y</parameter></paramdef>
<paramdef>GLsizei <parameter>width</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>Specifies the target to which the texture object is bound for
<function>glCopyTexSubImage1D</function> function. Must be
<constant>GL_TEXTURE_1D</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>texture</parameter></term>
<listitem>
<para>Specifies the texture object name for
<function>glCopyTextureSubImage1D</function> function.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>level</parameter></term>
<listitem>
<para>Specifies the level-of-detail number. Level 0 is the base
image level. Level <emphasis>n</emphasis> is the
<emphasis>n</emphasis>th mipmap reduction image.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>xoffset</parameter></term>
<listitem>
<para>Specifies the texel offset within the texture array.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>x</parameter></term>
<term><parameter>y</parameter></term>
<listitem>
<para>Specify the window coordinates of the left corner of the row
of pixels to be copied.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>width</parameter></term>
<listitem>
<para>Specifies the width of the texture subimage.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="description">
<title>Description</title>
<para><function>glCopyTexSubImage1D</function> and
<function>glCopyTextureSubImage1D</function> replace a portion of a
one-dimensional texture image with pixels from the current
<constant>GL_READ_BUFFER</constant> (rather than from main memory, as is
the case for
<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>).
For <function>glCopyTexSubImage1D</function>, the
texture object that is bound to <parameter>target</parameter> will be used
for the process. For <function>glCopyTextureSubImage1D</function>,
<parameter>texture</parameter> tells which texture object should be used
for the purpose of the call. </para>
<para>The screen-aligned pixel row with left corner at
(<parameter>x</parameter>,\ <parameter>y</parameter>), and with length
<parameter>width</parameter> replaces the portion of the texture array
with x indices <parameter>xoffset</parameter> through
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<!-- eqn: xoffset + width - 1: -->
<mml:mrow>
<mml:mi mathvariant="italic">xoffset</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">width</mml:mi>
<mml:mo>-</mml:mo>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:math>
</inlineequation>, inclusive. The destination in the texture array may
not include any texels outside the texture array as it was originally
specified.</para>
<para>The pixels in the row are processed exactly as if
<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>
had been called, but the process stops just before final
conversion. At this point, all pixel component values are clamped to the
range <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<!-- eqn: [0,1]: -->
<mml:mfenced close="]" open="[">
<mml:mn>0</mml:mn>
<mml:mn>1</mml:mn>
</mml:mfenced>
</mml:math>
</inlineequation> and then converted to the texture's internal format
for storage in the texel array.</para>
<para>It is not an error to specify a subtexture with zero width, but such
a specification has no effect. If any of the pixels within the specified
row of the current <constant>GL_READ_BUFFER</constant> are outside the
read window associated with the current rendering context, then the values
obtained for those pixels are undefined.</para>
<para>No change is made to the <emphasis>internalformat</emphasis> or
<emphasis>width</emphasis> parameters of the specified texture array or to
texel values outside the specified subregion.</para>
</refsect1>
<refsect1 xml:id="notes">
<title>Notes</title>
<para>The
<citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>
mode affects texture images.</para>
</refsect1>
<refsect1 xml:id="errors">
<title>Errors</title>
<para><constant>GL_INVALID_ENUM</constant> is generated by
<function>glCopyTexSubImage1D</function> if <parameter>target</parameter>
is not <constant>GL_TEXTURE_1D</constant>.</para>
<para><constant>GL_INVALID_FRAMEBUFFER_OPERATION</constant> is generated
if the object bound to <constant>GL_READ_FRAMEBUFFER_BINDING</constant> is
not framebuffer complete.</para>
<para><constant>GL_INVALID_OPERATION</constant> is generated by
<function>glCopyTextureSubImage1D</function> if
<parameter>texture</parameter> is not the name of an existing texture
object, or if the effective target of <parameter>texture</parameter> is
not <constant>GL_TEXTURE_1D</constant>.</para>
<para><constant>GL_INVALID_OPERATION</constant> is generated if the
texture array has not been defined by a previous
<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
or
<citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>
operation.</para>
<para><constant>GL_INVALID_VALUE</constant> is generated if
<parameter>level</parameter> is less than 0.</para>
<para><constant>GL_INVALID_VALUE</constant> may be generated if
<inlineequation>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<!-- eqn: level > log sub 2(max): -->
<mml:mrow>
<mml:mi mathvariant="italic">level</mml:mi>
<mml:mo>></mml:mo>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">log</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>⁡</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mi mathvariant="italic">max</mml:mi>
</mml:mfenced>
</mml:mrow>
</mml:mrow>
</mml:math>
</inlineequation>, where <emphasis>max</emphasis> is the returned value
of <constant>GL_MAX_TEXTURE_SIZE</constant>.</para>
<para><constant>GL_INVALID_VALUE</constant> is generated if
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<!-- eqn: xoffset < -b: -->
<mml:mrow>
<mml:mi mathvariant="italic">xoffset</mml:mi>
<mml:mo><</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math></inlineequation>,
or
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<!-- eqn: (xoffset + width) > (w-b): -->
<mml:mrow>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mi mathvariant="italic">xoffset</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">width</mml:mi>
</mml:mrow>
</mml:mfenced>
<mml:mo>></mml:mo>
<mml:mi mathvariant="italic">w</mml:mi>
</mml:mrow>
</mml:math>
</inlineequation>, where <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation> is the <constant>GL_TEXTURE_WIDTH</constant> of the
texture image being modified.</para>
<para><constant>GL_INVALID_OPERATION</constant> is generated if:</para>
<para><itemizedlist>
<listitem>
<para>the read buffer is <constant>GL_NONE</constant>, or</para>
</listitem>
<listitem>
<para>the value of <constant>GL_READ_FRAMEBUFFER_BINDING</constant>
is non-zero, and:<itemizedlist>
<listitem>
<para>the read buffer selects an attachment that has no image
attached, or</para>
</listitem>
<listitem>
<para>the effective value of
<constant>GL_SAMPLE_BUFFERS</constant> for the read
framebuffer is one.</para>
</listitem>
</itemizedlist></para>
</listitem>
</itemizedlist></para>
<para/>
</refsect1>
<refsect1 xml:id="associatedgets"><title>Associated Gets</title>
<para>
<citerefentry><refentrytitle>glGetTexImage</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry><function>glCopyTexSubImage1D</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='20']/*)"/>
</row>
<row>
<entry><function>glCopyTextureSubImage1D</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='45']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glReadBuffer</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"/> 1991-2006
Silicon Graphics, Inc.
Copyright <trademark class="copyright"/> 2012-2014 Khronos Group.
This document is licensed under the SGI
Free Software B License. For details, see
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</link>.
</para>
</refsect1>
</refentry>
|
