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<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glTexSubImage2D</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glTexSubImage2D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glTexSubImage2D — specify a two-dimensional texture subimage</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glTexSubImage2D</b>(</code></td><td>GLenum  </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">level</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">xoffset</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">yoffset</var>, </td></tr><tr><td> </td><td>GLsizei  </td><td><var class="pdparam">width</var>, </td></tr><tr><td> </td><td>GLsizei  </td><td><var class="pdparam">height</var>, </td></tr><tr><td> </td><td>GLenum  </td><td><var class="pdparam">format</var>, </td></tr><tr><td> </td><td>GLenum  </td><td><var class="pdparam">type</var>, </td></tr><tr><td> </td><td>const GLvoid *  </td><td><var class="pdparam">data</var><code>)</code>;</td></tr></table></div></div><p>
    </p><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>target</code></em></span></dt><dd><p>
                    Specifies the target texture.
                    Must be <code class="constant">GL_TEXTURE_2D</code>,
                    <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>,
                    <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_X</code>,
                    <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Y</code>,
                    <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</code>,
                    <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Z</code>, or
                    <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>.
                </p></dd><dt><span class="term"><em class="parameter"><code>level</code></em></span></dt><dd><p>
                    Specifies the level-of-detail number.
                    Level 0 is the base image level.
                    Level <span class="emphasis"><em>n</em></span> is the <span class="emphasis"><em>n</em></span>th mipmap reduction image.
                </p></dd><dt><span class="term"><em class="parameter"><code>xoffset</code></em></span></dt><dd><p>
                    Specifies a texel offset in the x direction within the texture array.
                </p></dd><dt><span class="term"><em class="parameter"><code>yoffset</code></em></span></dt><dd><p>
                    Specifies a texel offset in the y direction within the texture array.
                </p></dd><dt><span class="term"><em class="parameter"><code>width</code></em></span></dt><dd><p>
                    Specifies the width of the texture subimage.
                </p></dd><dt><span class="term"><em class="parameter"><code>height</code></em></span></dt><dd><p>
                    Specifies the height of the texture subimage.
                </p></dd><dt><span class="term"><em class="parameter"><code>format</code></em></span></dt><dd><p>
                    Specifies the format of the pixel data.
                    The following symbolic values are accepted:
                    <code class="constant">GL_COLOR_INDEX</code>,
                    <code class="constant">GL_RED</code>,
                    <code class="constant">GL_GREEN</code>,
                    <code class="constant">GL_BLUE</code>,
                    <code class="constant">GL_ALPHA</code>,
                    <code class="constant">GL_RGB</code>,
                    <code class="constant">GL_BGR</code>,
                    <code class="constant">GL_RGBA</code>,
                    <code class="constant">GL_BGRA</code>,
                    <code class="constant">GL_LUMINANCE</code>, and
                    <code class="constant">GL_LUMINANCE_ALPHA</code>.
                </p></dd><dt><span class="term"><em class="parameter"><code>type</code></em></span></dt><dd><p>
                    Specifies the data type of the pixel data.
                    The following symbolic values are accepted:
                    <code class="constant">GL_UNSIGNED_BYTE</code>,
                    <code class="constant">GL_BYTE</code>,
                    <code class="constant">GL_BITMAP</code>,
                    <code class="constant">GL_UNSIGNED_SHORT</code>,
                    <code class="constant">GL_SHORT</code>,
                    <code class="constant">GL_UNSIGNED_INT</code>,
                    <code class="constant">GL_INT</code>,
                    <code class="constant">GL_FLOAT</code>,
                    <code class="constant">GL_UNSIGNED_BYTE_3_3_2</code>,
                    <code class="constant">GL_UNSIGNED_BYTE_2_3_3_REV</code>,
                    <code class="constant">GL_UNSIGNED_SHORT_5_6_5</code>,
                    <code class="constant">GL_UNSIGNED_SHORT_5_6_5_REV</code>,
                    <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4</code>,
                    <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4_REV</code>,
                    <code class="constant">GL_UNSIGNED_SHORT_5_5_5_1</code>,
                    <code class="constant">GL_UNSIGNED_SHORT_1_5_5_5_REV</code>,
                    <code class="constant">GL_UNSIGNED_INT_8_8_8_8</code>,
                    <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code>,
                    <code class="constant">GL_UNSIGNED_INT_10_10_10_2</code>, and
                    <code class="constant">GL_UNSIGNED_INT_2_10_10_10_REV</code>.
                </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
                    Specifies a pointer to the image data in memory.
                </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            Texturing maps a portion of a specified texture image
            onto each graphical primitive for which texturing is enabled.
            To enable and disable two-dimensional texturing, call <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
            and <a class="citerefentry" href="glDisable.xml"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a> with argument <code class="constant">GL_TEXTURE_2D</code>.
        </p><p>
            <code class="function">glTexSubImage2D</code> redefines a contiguous subregion of an existing two-dimensional
            texture image.
            The texels referenced by <em class="parameter"><code>data</code></em> replace the portion of the
            existing texture array with x indices <em class="parameter"><code>xoffset</code></em> and 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <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>,
            inclusive,
            and y indices <em class="parameter"><code>yoffset</code></em> and 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mi mathvariant="italic">yoffset</mml:mi>
                    <mml:mo>+</mml:mo>
                    <mml:mi mathvariant="italic">height</mml:mi>
                    <mml:mo>-</mml:mo>
                    <mml:mn>1</mml:mn>
                </mml:mrow>
            </mml:math>,
            inclusive.
            This region may not include any texels outside the range of the
            texture array as it was originally specified.
            It is not an error to specify a subtexture with zero width or height, but
            such a specification has no effect.
        </p><p>
            If a non-zero named buffer object is bound to the <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target 
            (see <a class="citerefentry" href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>) while a texture image is
            specified, <em class="parameter"><code>data</code></em> is treated as a byte offset into the buffer object's data store.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
            <code class="function">glTexSubImage2D</code> is available only if the GL version is 1.1 or greater.
        </p><p>
            Texturing has no effect in color index mode.
        </p><p>
            <a class="citerefentry" href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a> and <a class="citerefentry" href="glPixelTransfer.xml"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a> modes affect texture images
            in exactly the way they affect <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>.
        </p><p>
            Formats <code class="constant">GL_BGR</code>, and <code class="constant">GL_BGRA</code> and types
            <code class="constant">GL_UNSIGNED_BYTE_3_3_2</code>,
            <code class="constant">GL_UNSIGNED_BYTE_2_3_3_REV</code>,
            <code class="constant">GL_UNSIGNED_SHORT_5_6_5</code>,
            <code class="constant">GL_UNSIGNED_SHORT_5_6_5_REV</code>,
            <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4</code>,
            <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4_REV</code>,
            <code class="constant">GL_UNSIGNED_SHORT_5_5_5_1</code>,
            <code class="constant">GL_UNSIGNED_SHORT_1_5_5_5_REV</code>,
            <code class="constant">GL_UNSIGNED_INT_8_8_8_8</code>,
            <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code>,
            <code class="constant">GL_UNSIGNED_INT_10_10_10_2</code>, and
            <code class="constant">GL_UNSIGNED_INT_2_10_10_10_REV</code> are available only if the GL version
            is 1.2 or greater.
        </p><p>
            For OpenGL versions 1.3 and greater, or when the <code class="code">ARB_multitexture</code> extension is supported, <code class="function">glTexSubImage2D</code>
            specifies a two-dimensional subtexture for the current texture unit,
            specified with <a class="citerefentry" href="glActiveTexture.xml"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>.
        </p><p>
            When the <code class="code">ARB_imaging</code> extension is supported, the RGBA components
            specified in <em class="parameter"><code>data</code></em> may be processed by the imaging pipeline.  See
            <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a> for specific details.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>target</code></em> is not <code class="constant">GL_TEXTURE_2D</code>,
            <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>,
            <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_X</code>,
            <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Y</code>,
            <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</code>,
            <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Z</code>, or
            <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>.
        </p><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>format</code></em> is not an accepted
            format constant.
        </p><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>type</code></em> is not a type constant.
        </p><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>type</code></em> is <code class="constant">GL_BITMAP</code> and
            <em class="parameter"><code>format</code></em> is not <code class="constant">GL_COLOR_INDEX</code>.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>level</code></em> is less than 0.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> may be generated if <em class="parameter"><code>level</code></em> is greater
            than 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:msub><mml:mi mathvariant="italic">log</mml:mi>
                <mml:mn>2</mml:mn>
                </mml:msub>
            </mml:math>
            <span class="emphasis"><em>max</em></span>,
            where <span class="emphasis"><em>max</em></span> is the returned value of <code class="constant">GL_MAX_TEXTURE_SIZE</code>.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mi mathvariant="italic">xoffset</mml:mi>
                    <mml:mo>&lt;</mml:mo>
                    <mml:mrow>
                        <mml:mo>-</mml:mo>
                        <mml:mi mathvariant="italic">b</mml:mi>
                    </mml:mrow>
                </mml:mrow>
            </mml:math>,
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <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>&gt;</mml:mo>
                    <mml:mfenced open="(" close=")">
                        <mml:mrow>
                            <mml:mi mathvariant="italic">w</mml:mi>
                            <mml:mo>-</mml:mo>
                            <mml:mi mathvariant="italic">b</mml:mi>
                        </mml:mrow>
                    </mml:mfenced>
                </mml:mrow>
            </mml:math>,
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mi mathvariant="italic">yoffset</mml:mi>
                    <mml:mo>&lt;</mml:mo>
                    <mml:mrow>
                        <mml:mo>-</mml:mo>
                        <mml:mi mathvariant="italic">b</mml:mi>
                    </mml:mrow>
                </mml:mrow>
            </mml:math>,
            or 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                
                <mml:mrow>
                    <mml:mfenced open="(" close=")">
                        <mml:mrow>
                            <mml:mi mathvariant="italic">yoffset</mml:mi>
                            <mml:mo>+</mml:mo>
                            <mml:mi mathvariant="italic">height</mml:mi>
                        </mml:mrow>
                    </mml:mfenced>
                    <mml:mo>&gt;</mml:mo>
                    <mml:mfenced open="(" close=")">
                        <mml:mrow>
                            <mml:mi mathvariant="italic">h</mml:mi>
                            <mml:mo>-</mml:mo>
                            <mml:mi mathvariant="italic">b</mml:mi>
                        </mml:mrow>
                    </mml:mfenced>
                </mml:mrow>
            </mml:math>,
            where 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">w</mml:mi></mml:math>
            is the <code class="constant">GL_TEXTURE_WIDTH</code>,
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">h</mml:mi></mml:math>
            is the <code class="constant">GL_TEXTURE_HEIGHT</code>, and 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">b</mml:mi></mml:math>
            is the border width
            of the texture image being modified.
            Note that 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">w</mml:mi></mml:math>
            and 
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">h</mml:mi></mml:math>
            include twice the border width.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>width</code></em> or <em class="parameter"><code>height</code></em> is less than 0.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if the texture array has not
            been defined by a previous <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a> operation.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>type</code></em> is one of
            <code class="constant">GL_UNSIGNED_BYTE_3_3_2</code>,
            <code class="constant">GL_UNSIGNED_BYTE_2_3_3_REV</code>,
            <code class="constant">GL_UNSIGNED_SHORT_5_6_5</code>, or
            <code class="constant">GL_UNSIGNED_SHORT_5_6_5_REV</code>
            and <em class="parameter"><code>format</code></em> is not <code class="constant">GL_RGB</code>.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>type</code></em> is one of
            <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4</code>,
            <code class="constant">GL_UNSIGNED_SHORT_4_4_4_4_REV</code>,
            <code class="constant">GL_UNSIGNED_SHORT_5_5_5_1</code>,
            <code class="constant">GL_UNSIGNED_SHORT_1_5_5_5_REV</code>,
            <code class="constant">GL_UNSIGNED_INT_8_8_8_8</code>,
            <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code>,
            <code class="constant">GL_UNSIGNED_INT_10_10_10_2</code>, or
            <code class="constant">GL_UNSIGNED_INT_2_10_10_10_REV</code>
            and <em class="parameter"><code>format</code></em> is neither <code class="constant">GL_RGBA</code> nor <code class="constant">GL_BGRA</code>.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the
            <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the buffer object's data store is currently mapped.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the
            <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the data would be unpacked from the buffer 
            object such that the memory reads required would exceed the data store size.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the
            <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and <em class="parameter"><code>data</code></em> is not evenly divisible 
            into the number of bytes needed to store in memory a datum indicated by <em class="parameter"><code>type</code></em>.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glTexSubImage2D</code> is executed
            between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> and the corresponding
            execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a class="citerefentry" href="glGetTexImage.xml"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a>
        </p><p>
            <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_TEXTURE_2D</code>
        </p><p>
            <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_UNPACK_BUFFER_BINDING</code>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glActiveTexture.xml"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage1D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glDrawPixels.xml"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>,
            <a class="citerefentry" href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>,
            <a class="citerefentry" href="glPixelTransfer.xml"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>,
            <a class="citerefentry" href="glTexEnv.xml"><span class="citerefentry"><span class="refentrytitle">glTexEnv</span></span></a>,
            <a class="citerefentry" href="glTexGen.xml"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>,
            <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>,
            <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,
            <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glTexParameter.xml"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div></body></html>
