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><head><title>glTexSubImage2D</title><link rel="stylesheet" href="style.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.59.1"/><link rel="home" href="index.xml" title="PyOpenGL 2.0.1.07 Man Pages"/><link rel="up" href="reference-GL.xml" title="GL"/><link rel="previous" href="glTexSubImage1D.3G.xml" title="glTexSubImage1D"/><link rel="next" href="glTexSubImage3D.3G.xml" title="glTexSubImage3D"/></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">glTexSubImage2D</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glTexSubImage1D.3G.xml">Prev</a> </td><th width="60%" align="center">GL</th><td width="20%" align="right"> <a accesskey="n" href="glTexSubImage3D.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glTexSubImage2D.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glTexSubImage2D.3G-name"/><h2>Name</h2><p>glTexSubImage2D, glTexSubImage2Db, glTexSubImage2Df, glTexSubImage2Di, glTexSubImage2Ds, glTexSubImage2Dub, glTexSubImage2Dui, glTexSubImage2Dus &#8212; specify a two-dimensional texture subimage</p></div><div class="refsynopsisdiv"><a name="glTexSubImage2D.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void <tt>glTexSubImage2D</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLenum <i><tt>target</tt></i>, GLint <i><tt>level</tt></i>, GLint <i><tt>xoffset</tt></i>, GLint <i><tt>yoffset</tt></i>, GLsizei <i><tt>width</tt></i>, GLsizei <i><tt>height</tt></i>, GLenum <i><tt>format</tt></i>, GLenum <i><tt>type</tt></i>, const GLvoid *<i><tt>pixels</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glTexSubImage2D.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glTexSubImage2D</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>width</tt></i>, <i><tt>height</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>) &#8594; <tt>None</tt></code></td></tr><tr><td valign="top"><code><tt>glTexSubImage2Db</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>[][][]) &#8594; <tt>None</tt></code></td></tr><tr><td valign="top"><code><tt>glTexSubImage2Df</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>[][][]) &#8594; <tt>None</tt></code></td></tr><tr><td valign="top"><code><tt>glTexSubImage2Di</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>[][][]) &#8594; <tt>None</tt></code></td></tr><tr><td valign="top"><code><tt>glTexSubImage2Ds</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>[][][]) &#8594; <tt>None</tt></code></td></tr><tr><td valign="top"><code><tt>glTexSubImage2Dub</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>[][][]) &#8594; <tt>None</tt></code></td></tr><tr><td valign="top"><code><tt>glTexSubImage2Dui</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>[][][]) &#8594; <tt>None</tt></code></td></tr><tr><td valign="top"><code><tt>glTexSubImage2Dus</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>level</tt></i>, <i><tt>xoffset</tt></i>, <i><tt>yoffset</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>pixels</tt></i>[][][]) &#8594; <tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glTexSubImage2D.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>target</tt></i></span></dt><dd>
						Specifies the target texture. Must be <tt>GL_TEXTURE_2D</tt>.
					</dd><dt><span class="term"><i><tt>level</tt></i></span></dt><dd>
						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.
					</dd><dt><span class="term"><i><tt>xoffset</tt></i></span></dt><dd>
						Specifies a texel offset in the x direction within the texture array.
					</dd><dt><span class="term"><i><tt>yoffset</tt></i></span></dt><dd>
						Specifies a texel offset in the y direction within the texture array.
					</dd><dt><span class="term"><i><tt>width</tt></i></span></dt><dd>
						Specifies the width of the texture subimage.
					</dd><dt><span class="term"><i><tt>height</tt></i></span></dt><dd>
						Specifies the height of the texture subimage.
					</dd><dt><span class="term"><i><tt>format</tt></i></span></dt><dd>
						Specifies the of the pixel data. The following symbolic values are accepted:
						<tt>GL_COLOR_INDEX</tt>, <tt>GL_RED</tt>, <tt>GL_GREEN</tt>,
						<tt>GL_BLUE</tt>, <tt>GL_ALPHA</tt>, <tt>GL_RGB</tt>,
						<tt>GL_BGR</tt>, <tt>GL_RGBA</tt>, <tt>GL_BGRA</tt>,
						<tt>GL_LUMINANCE</tt>, and <tt>GL_LUMINANCE_ALPHA</tt>.
					</dd><dt><span class="term"><i><tt>type</tt></i></span></dt><dd>
						Specifies the data type of the pixel data. The following symbolic values are accepted:
						<tt>GL_UNSIGNED_BYTE</tt>, <tt>GL_BYTE</tt>, <tt>GL_BITMAP</tt>,
						<tt>GL_UNSIGNED_SHORT</tt>, <tt>GL_SHORT</tt>,
						<tt>GL_UNSIGNED_INT</tt>, <tt>GL_INT</tt>, <tt>GL_FLOAT</tt>,
						<tt>GL_UNSIGNED_BYTE_3_3_2</tt>, <tt>GL_UNSIGNED_BYTE_2_3_3_REV</tt>,
						<tt>GL_UNSIGNED_SHORT_5_6_5</tt>, <tt>GL_UNSIGNED_SHORT_5_6_5_REV</tt>,
						<tt>GL_UNSIGNED_SHORT_4_4_4_4</tt>, <tt>GL_UNSIGNED_SHORT_4_4_4_4_REV</tt>,
						<tt>GL_UNSIGNED_SHORT_5_5_5_1</tt>, <tt>GL_UNSIGNED_SHORT_1_5_5_5_REV</tt>,
						<tt>GL_UNSIGNED_INT_8_8_8_8</tt>, <tt>GL_UNSIGNED_INT_8_8_8_8_REV</tt>,
						<tt>GL_UNSIGNED_INT_10_10_10_2</tt>, and <tt>GL_UNSIGNED_INT_2_10_10_10_REV</tt>.
					</dd><dt><span class="term"><i><tt>pixels</tt></i></span></dt><dd>
						Specifies a pointer to the image data in memory.
					</dd></dl></div></div><div class="refsect1" lang="en"><a name="glTexSubImage2D.3G-description"/><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 href="glEnable.3G.xml"><tt>glEnable</tt></a> and <a href="glEnable.3G.xml"><tt>glDisable</tt></a> with argument <tt>GL_TEXTURE_2D</tt>.
		</p><p>
			<tt>glTexSubImage2D</tt> redefines a contiguous subregion of an existing two-dimensional texture image. The
			texels referenced by <i><tt>pixels</tt></i> replace the portion of the existing texture array with x indices
			<i><tt>xoffset</tt></i> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mrow>
						<mml:mi>xoffset</mml:mi>
						<mml:mo>+</mml:mo>
						<mml:mi>width</mml:mi>
						<mml:mo>-</mml:mo>
						<mml:mn>1</mml:mn>
					</mml:mrow>
				</mml:math>, inclusive, and y indices <i><tt>yoffset</tt></i> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mrow>
						<mml:mi>yoffset</mml:mi>
						<mml:mo>+</mml:mo>
						<mml:mi>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></div><div class="refsect1" lang="en"><a name="glTexSubImage2D.3G-notes"/><h2>Notes</h2><p>
			<tt>glTexSubImage2D</tt> is available only if the GL version is 1.1 or greater.
		</p><p>
			Texturing has no effect in color index mode.
		</p><p>
			<tt>glPixelStore</tt> and <tt>glPixelTransfer</tt>
			modes affect texture images in exactly the way they affect <a href="glDrawPixels.3G.xml"><tt>glDrawPixels</tt></a>.
		</p><p>
			Formats <tt>GL_BGR</tt>, and <tt>GL_BGRA</tt> and types
			<tt>GL_UNSIGNED_BYTE_3_3_2</tt>, <tt>GL_UNSIGNED_BYTE_2_3_3_REV</tt>,
			<tt>GL_UNSIGNED_SHORT_5_6_5</tt>, <tt>GL_UNSIGNED_SHORT_5_6_5_REV</tt>,
			<tt>GL_UNSIGNED_SHORT_4_4_4_4</tt>, <tt>GL_UNSIGNED_SHORT_4_4_4_4_REV</tt>,
			<tt>GL_UNSIGNED_SHORT_5_5_5_1</tt>, <tt>GL_UNSIGNED_SHORT_1_5_5_5_REV</tt>,
			<tt>GL_UNSIGNED_INT_8_8_8_8</tt>, <tt>GL_UNSIGNED_INT_8_8_8_8_REV</tt>,
			<tt>GL_UNSIGNED_INT_10_10_10_2</tt>, and <tt>GL_UNSIGNED_INT_2_10_10_10_REV</tt> are available
			only if the GL version is 1.2 or greater.
		</p><p>
			When the <tt>GL_ARB_multitexture</tt> extension is supported, <tt>glTexSubImage2D</tt>
			specifies a two-dimensional sub texture for the current texture unit, specified with <a href="glActiveTextureARB.3G.xml"><tt>glActiveTextureARB</tt></a>.
		</p><p>
			When the <tt>GL_ARB_imaging</tt> extension is supported, the RGBA components specified in
			<i><tt>pixels</tt></i> may be processed by the imaging pipeline. See <a href="glTexImage1D.3G.xml"><tt>glTexImage1D</tt></a> for specific details.
		</p></div><div class="refsect1" lang="en"><a name="glTexSubImage2D.3G-errors"/><h2>Errors</h2><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>target</tt></i> is not
			<tt>GL_TEXTURE_2D</tt>.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if the texture array has not been defined by a previous
			<a href="glTexImage2D.3G.xml"><tt>glTexImage2D</tt></a> operation.
		</p><p>
			<tt>GL_INVALID_VALUE</tt> is generated if <i><tt>level</tt></i> is less than 0.
		</p><p>
			<tt>GL_INVALID_VALUE</tt> may be generated if <i><tt>level</tt></i> is greater than <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:msub>
						<mml:mo>log</mml:mo>
						<mml:mn>2</mml:mn>
					</mml:msub>
				</mml:math><i><tt>max</tt></i>, where <i><tt>max</tt></i> is the returned value of
			<tt>GL_MAX_TEXTURE_SIZE</tt>.
		</p><p>
			<tt>GL_INVALID_VALUE</tt> is generated if <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mrow>
						<mml:mi>xoffset</mml:mi>
						<mml:mo>&lt;</mml:mo>
						<mml:mo>-b</mml:mo>
					</mml:mrow>
				</mml:math>, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mfenced separator=",">
						<mml:mrow>
							<mml:mi>xoffset</mml:mi>
							<mml:mo>+</mml:mo>
							<mml:mi>width</mml:mi>
						</mml:mrow>
					</mml:mfenced>
					<mml:mo>&gt;</mml:mo>
					<mml:mfenced separator=",">
						<mml:mrow>
							<mml:mi>w</mml:mi>
							<mml:mo>-</mml:mo>
							<mml:mi>b</mml:mi>
						</mml:mrow>
					</mml:mfenced>
				</mml:math>, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mrow>
						<mml:mi>yoffset</mml:mi>
						<mml:mo>&lt;</mml:mo>
						<mml:mo>-b</mml:mo>
					</mml:mrow>
				</mml:math>, or <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mrow>
						<mml:mo>(</mml:mo>
						<mml:mi>yoffset</mml:mi>
						<mml:mo>+</mml:mo>
						<mml:mi>height</mml:mi>
						<mml:mo>)</mml:mo>
						<mml:mo>&gt;</mml:mo>
						<mml:mo>(</mml:mo>
						<mml:mi>h</mml:mi>
						<mml:mo>-</mml:mo>
						<mml:mi>b</mml:mi>
						<mml:mo>)</mml:mo>
					</mml:mrow>
				</mml:math>, where <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>w</mml:mi>
				</mml:math> is the <tt>GL_TEXTURE_WIDTH</tt>, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>h</mml:mi>
				</mml:math> is the <tt>GL_TEXTURE_HEIGHT</tt>, and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>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>w</mml:mi>
				</mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>h</mml:mi>
				</mml:math> include twice the border width.
		</p><p>
			<tt>GL_INVALID_VALUE</tt> is generated if <i><tt>width</tt></i> or <i><tt>height</tt></i> is
			less than 0.
		</p><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>format</tt></i> is not an accepted constant.
		</p><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>type</tt></i> is not a type constant.
		</p><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>type</tt></i> is <tt>GL_BITMAP</tt> and
			<i><tt>format</tt></i> is not <tt>GL_COLOR_INDEX</tt>.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <tt>glTexSubImage2D</tt> is executed between the
			execution of <a href="glBegin.3G.xml"><tt>glBegin</tt></a> and the corresponding execution of <a href="glBegin.3G.xml"><tt>glEnd</tt></a>.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <i><tt>type</tt></i> is one of
			<tt>GL_UNSIGNED_BYTE_3_3_2</tt>, <tt>GL_UNSIGNED_BYTE_2_3_3_REV</tt>,
			<tt>GL_UNSIGNED_SHORT_5_6_5</tt>, or <tt>GL_UNSIGNED_SHORT_5_6_5_REV</tt> and
			<i><tt>format</tt></i> is not <tt>GL_RGB</tt>.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <i><tt>type</tt></i> is one of
			<tt>GL_UNSIGNED_SHORT_4_4_4_4</tt>, <tt>GL_UNSIGNED_SHORT_4_4_4_4_REV</tt>,
			<tt>GL_UNSIGNED_SHORT_5_5_5_1</tt>, <tt>GL_UNSIGNED_SHORT_1_5_5_5_REV</tt>,
			<tt>GL_UNSIGNED_INT_8_8_8_8</tt>, <tt>GL_UNSIGNED_INT_8_8_8_8_REV</tt>,
			<tt>GL_UNSIGNED_INT_10_10_10_2</tt>, or <tt>GL_UNSIGNED_INT_2_10_10_10_REV</tt> and
			<i><tt>format</tt></i> is neither <tt>GL_RGBA</tt> nor <tt>GL_BGRA</tt>.
		</p></div><div class="refsect1" lang="en"><a name="glTexSubImage2D.3G-associated_gets"/><h2>Associated Gets</h2><p>
			<a href="glGetTexImage.3G.xml"><tt>glGetTexImage</tt></a>
		</p><p>
			<a href="glIsEnabled.3G.xml"><tt>glIsEnabled</tt></a> with argument <tt>GL_TEXTURE_2D</tt>
		</p></div><div class="refsect1" lang="en"><a name="glTexSubImage2D.3G-see_also"/><h2>See Also</h2><p>
			<span class="simplelist"><a href="glActiveTextureARB.3G.xml">glActiveTextureARB</a>, <a href="glCopyTexImage1D.3G.xml">glCopyTexImage1D</a>, <a href="glCopyTexImage2D.3G.xml">glCopyTexImage2D</a>, <a href="glCopyTexSubImage1D.3G.xml">glCopyTexSubImage1D</a>, <a href="glCopyTexSubImage2D.3G.xml">glCopyTexSubImage2D</a>, <a href="glCopyTexSubImage3D.3G.xml">glCopyTexSubImage3D</a>, <a href="glDrawPixels.3G.xml">glDrawPixels</a>, <a href="glPixelStore.3G.xml">glPixelStore</a>, <a href="glPixelTransfer.3G.xml">glPixelTransfer</a>, <a href="glTexEnv.3G.xml">glTexEnv</a>, <a href="glTexGen.3G.xml">glTexGen</a>, <a href="glTexImage1D.3G.xml">glTexImage1D</a>, <a href="glTexImage2D.3G.xml">glTexImage2D</a>, <a href="glTexImage3D.3G.xml">glTexImage3D</a>, <a href="glTexSubImage1D.3G.xml">glTexSubImage1D</a>, <a href="glTexSubImage3D.3G.xml">glTexSubImage3D</a>, <a href="glTexParameter.3G.xml">glTexParameter</a></span>
		</p></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="glTexSubImage1D.3G.xml">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference-GL.xml">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="glTexSubImage3D.3G.xml">Next</a></td></tr><tr><td width="40%" align="left" valign="top">glTexSubImage1D </td><td width="20%" align="center"><a accesskey="h" href="index.xml">Home</a></td><td width="40%" align="right" valign="top"> glTexSubImage3D</td></tr></table></div></body></html>
