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><head><title>glCopyTexImage2D</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="glCopyTexImage1D.3G.xml" title="glCopyTexImage1D"/><link rel="next" href="glCopyTexSubImage1D.3G.xml" title="glCopyTexSubImage1D"/></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">glCopyTexImage2D</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glCopyTexImage1D.3G.xml">Prev</a> </td><th width="60%" align="center">GL</th><td width="20%" align="right"> <a accesskey="n" href="glCopyTexSubImage1D.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glCopyTexImage2D.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glCopyTexImage2D.3G-name"/><h2>Name</h2><p>glCopyTexImage2D &#8212; copy pixels into a 2D texture image</p></div><div class="refsynopsisdiv"><a name="glCopyTexImage2D.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void <tt>glCopyTexImage2D</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>, GLenum <i><tt>internalformat</tt></i>, GLint <i><tt>x</tt></i>, GLint <i><tt>y</tt></i>, GLsizei <i><tt>width</tt></i>, GLsizei <i><tt>height</tt></i>, GLint <i><tt>border</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glCopyTexImage2D.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glCopyTexImage2D</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>internalformat</tt></i>, <i><tt>x</tt></i>, <i><tt>y</tt></i>, <i><tt>width</tt></i>, <i><tt>height</tt></i>, <i><tt>border</tt></i>) &#8594; <tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glCopyTexImage2D.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 <i><tt>n</tt></i> is
						the <i><tt>n</tt></i>th mipmap reduction image.
					</dd><dt><span class="term"><i><tt>internalformat</tt></i></span></dt><dd>
						Specifies the internal of the texture. Must be one of the following symbolic constants:
						<tt>GL_ALPHA</tt>, <tt>GL_ALPHA4</tt>, <tt>GL_ALPHA8</tt>,
						<tt>GL_ALPHA12</tt>, <tt>GL_ALPHA16</tt>, <tt>GL_LUMINANCE</tt>,
						<tt>GL_LUMINANCE4</tt>, <tt>GL_LUMINANCE8</tt>,
						<tt>GL_LUMINANCE12</tt>, <tt>GL_LUMINANCE16</tt>,
						<tt>GL_LUMINANCE_ALPHA</tt>, <tt>GL_LUMINANCE4_ALPHA4</tt>,
						<tt>GL_LUMINANCE6_ALPHA2</tt>, <tt>GL_LUMINANCE8_ALPHA8</tt>,
						<tt>GL_LUMINANCE12_ALPHA4</tt>, <tt>GL_LUMINANCE12_ALPHA12</tt>,
						<tt>GL_LUMINANCE16_ALPHA16</tt>, <tt>GL_INTENSITY</tt>,
						<tt>GL_INTENSITY4</tt>, <tt>GL_INTENSITY8</tt>,
						<tt>GL_INTENSITY12</tt>, <tt>GL_INTENSITY16</tt>, <tt>GL_RGB</tt>,
						<tt>GL_R3_G3_B2</tt>, <tt>GL_RGB4</tt>, <tt>GL_RGB5</tt>,
						<tt>GL_RGB8</tt>, <tt>GL_RGB10</tt>, <tt>GL_RGB12</tt>,
						<tt>GL_RGB16</tt>, <tt>GL_RGBA</tt>, <tt>GL_RGBA2</tt>,
						<tt>GL_RGBA4</tt>, <tt>GL_RGB5_A1</tt>, <tt>GL_RGBA8</tt>,
						<tt>GL_RGB10_A2</tt>, <tt>GL_RGBA12</tt>, or <tt>GL_RGBA16</tt>.
					</dd><dt><span class="term"><i><tt>x</tt></i>, <i><tt>y</tt></i></span></dt><dd>
						Specify the window coordinates of the lower left corner of the rectangular region of pixels to be copied.
					</dd><dt><span class="term"><i><tt>width</tt></i></span></dt><dd>
						Specifies the width of the texture image. Must be 0 or <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
								<mml:msup>
									<mml:mn>2</mml:mn>
									<mml:mi>n</mml:mi>
								</mml:msup>
								<mml:mo>+</mml:mo>
								<mml:mrow>
									<mml:mn>2</mml:mn>
									<mml:mo>×</mml:mo>
									<mml:mi>border</mml:mi>
								</mml:mrow>
							</mml:math> for some integer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
								<mml:mi>n</mml:mi>
							</mml:math>.
					</dd><dt><span class="term"><i><tt>height</tt></i></span></dt><dd>
						Specifies the height of the texture image. Must be 0 or <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
								<mml:msup>
									<mml:mn>2</mml:mn>
									<mml:mi>m</mml:mi>
								</mml:msup>
								<mml:mo>+</mml:mo>
								<mml:mrow>
									<mml:mn>2</mml:mn>
									<mml:mo>×</mml:mo>
									<mml:mi>border</mml:mi>
								</mml:mrow>
							</mml:math> for some integer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
								<mml:mi>m</mml:mi>
							</mml:math>.
					</dd><dt><span class="term"><i><tt>border</tt></i></span></dt><dd>
						Specifies the width of the border. Must be either 0 or 1.
					</dd></dl></div></div><div class="refsect1" lang="en"><a name="glCopyTexImage2D.3G-description"/><h2>Description</h2><p>
			<tt>glCopyTexImage2D</tt> defines a two-dimensional texture image with pixels from the current
			<tt>GL_READ_BUFFER</tt>.
		</p><p>
			The screen-aligned pixel rectangle with lower left corner at (<i><tt>x</tt></i>, <i><tt>y</tt></i>) and
			with a width of <i><tt>width</tt></i>&#8201;+&#8201;2×<i><tt>border</tt></i> and a height of
			<i><tt>height</tt></i>&#8201;+&#8201;2×<i><tt>border</tt></i> defines the texture array at the
			mipmap level specified by <i><tt>level</tt></i>. <i><tt>internalformat</tt></i> specifies the internal of
			the texture array.
		</p><p>
			The pixels in the rectangle are processed exactly as if <a href="glCopyPixels.3G.xml"><tt>glCopyPixels</tt></a> had been
			called, but the process stops just before final conversion. At this point all pixel component values are clamped to the
			range <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mfenced separator="," open="[" close="]">
						<mml:mn>0</mml:mn>
						<mml:mn>1</mml:mn>
					</mml:mfenced>
				</mml:math> and then converted to the texture's internal for storage in the texel array.
		</p><p>
			Pixel ordering is such that lower <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>x</mml:mi>
				</mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>y</mml:mi>
				</mml:math> screen coordinates correspond to lower <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>s</mml:mi>
				</mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>t</mml:mi>
				</mml:math> texture coordinates.
		</p><p>
			If any of the pixels within the specified rectangle of the current <tt>GL_READ_BUFFER</tt> are outside the
			window associated with the current rendering context, then the values obtained for those pixels are undefined.
		</p></div><div class="refsect1" lang="en"><a name="glCopyTexImage2D.3G-notes"/><h2>Notes</h2><p>
			<tt>glCopyTexImage2D</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>
			1, 2, 3, and 4 are not accepted values for <i><tt>internalformat</tt></i>.
		</p><p>
			An image with height or width of 0 indicates a <tt>NULL</tt> texture.
		</p><p>
			When the <tt>GL_ARB_imaging</tt> extension is supported, the RGBA components read from the framebuffer 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="glCopyTexImage2D.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_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:mi>log</mml:mi>
						<mml:mn>2</mml:mn>
					</mml:msub>
					<mml:mi>max</mml:mi>
				</mml:math>, where <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>max</mml:mi>
				</mml:math> is the returned value of <tt>GL_MAX_TEXTURE_SIZE</tt>.
		</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, greater than 2&#8201;+&#8201;<tt>GL_MAX_TEXTURE_SIZE</tt>, or if
			<i><tt>width</tt></i> or <i><tt>height</tt></i> cannot be represented as <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:msup>
						<mml:mn>2</mml:mn>
						<mml:mi>k</mml:mi>
					</mml:msup>
					<mml:mo>+</mml:mo>
					<mml:mrow>
						<mml:mn>2</mml:mn>
						<mml:mo>×</mml:mo>
						<mml:mi>border</mml:mi>
					</mml:mrow>
				</mml:math> for some integer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
					<mml:mi>k</mml:mi>
				</mml:math>.
		</p><p>
			<tt>GL_INVALID_VALUE</tt> is generated if <i><tt>border</tt></i> is not 0 or 1.
		</p><p>
			<tt>GL_INVALID_VALUE</tt> is generated if <i><tt>internalformat</tt></i> is not one of the allowable
			values.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <tt>glCopyTexImage2D</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></div><div class="refsect1" lang="en"><a name="glCopyTexImage2D.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="glCopyTexImage2D.3G-see_also"/><h2>See Also</h2><p>
			<span class="simplelist"><a href="glCopyPixels.3G.xml">glCopyPixels</a>, <a href="glCopyTexImage1D.3G.xml">glCopyTexImage1D</a>, <a href="glCopyTexSubImage1D.3G.xml">glCopyTexSubImage1D</a>, <a href="glCopyTexSubImage2D.3G.xml">glCopyTexSubImage2D</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="glTexSubImage1D.3G.xml">glTexSubImage1D</a>, <a href="glTexSubImage2D.3G.xml">glTexSubImage2D</a>, <a href="glTexParameter.3G.xml">glTexParameter</a></span>
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