glTexImage2D.xhtml

<div class="refentry" lang="en" xml:lang="en"><a id="glTexImage2D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glTexImage2D — specify a two-dimensional texture image</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table><tr><td><code class="funcdef">void <b class="fsfunc">glTexImage2D</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">internalFormat</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>GLint  </td><td><var class="pdparam">border</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_PROXY_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>,
                    <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>, or
                    <code class="constant">GL_PROXY_TEXTURE_CUBE_MAP</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>internalFormat</code></em></span></dt><dd><p>
                    Specifies the number of color components in the texture.
                    Must be 1, 2, 3, or 4, or one of the following symbolic constants:
                    <code class="constant">GL_ALPHA</code>,
                    <code class="constant">GL_ALPHA4</code>,
                    <code class="constant">GL_ALPHA8</code>,
                    <code class="constant">GL_ALPHA12</code>,
                    <code class="constant">GL_ALPHA16</code>,
                    <code class="constant">GL_COMPRESSED_ALPHA</code>,
                    <code class="constant">GL_COMPRESSED_LUMINANCE</code>,
                    <code class="constant">GL_COMPRESSED_LUMINANCE_ALPHA</code>,
                    <code class="constant">GL_COMPRESSED_INTENSITY</code>,
                    <code class="constant">GL_COMPRESSED_RGB</code>,
                    <code class="constant">GL_COMPRESSED_RGBA</code>,
                    <code class="constant">GL_DEPTH_COMPONENT</code>,
                    <code class="constant">GL_DEPTH_COMPONENT16</code>,
                    <code class="constant">GL_DEPTH_COMPONENT24</code>,
                    <code class="constant">GL_DEPTH_COMPONENT32</code>,
                    <code class="constant">GL_LUMINANCE</code>,
                    <code class="constant">GL_LUMINANCE4</code>,
                    <code class="constant">GL_LUMINANCE8</code>,
                    <code class="constant">GL_LUMINANCE12</code>,
                    <code class="constant">GL_LUMINANCE16</code>,
                    <code class="constant">GL_LUMINANCE_ALPHA</code>,
                    <code class="constant">GL_LUMINANCE4_ALPHA4</code>,
                    <code class="constant">GL_LUMINANCE6_ALPHA2</code>,
                    <code class="constant">GL_LUMINANCE8_ALPHA8</code>,
                    <code class="constant">GL_LUMINANCE12_ALPHA4</code>,
                    <code class="constant">GL_LUMINANCE12_ALPHA12</code>,
                    <code class="constant">GL_LUMINANCE16_ALPHA16</code>,
                    <code class="constant">GL_INTENSITY</code>,
                    <code class="constant">GL_INTENSITY4</code>,
                    <code class="constant">GL_INTENSITY8</code>,
                    <code class="constant">GL_INTENSITY12</code>,
                    <code class="constant">GL_INTENSITY16</code>,
                    <code class="constant">GL_R3_G3_B2</code>,
                    <code class="constant">GL_RGB</code>,
                    <code class="constant">GL_RGB4</code>,
                    <code class="constant">GL_RGB5</code>,
                    <code class="constant">GL_RGB8</code>,
                    <code class="constant">GL_RGB10</code>,
                    <code class="constant">GL_RGB12</code>,
                    <code class="constant">GL_RGB16</code>,
                    <code class="constant">GL_RGBA</code>,
                    <code class="constant">GL_RGBA2</code>,
                    <code class="constant">GL_RGBA4</code>,
                    <code class="constant">GL_RGB5_A1</code>,
                    <code class="constant">GL_RGBA8</code>,
                    <code class="constant">GL_RGB10_A2</code>,
                    <code class="constant">GL_RGBA12</code>,
                    <code class="constant">GL_RGBA16</code>,
                    <code class="constant">GL_SLUMINANCE</code>,
                    <code class="constant">GL_SLUMINANCE8</code>,
                    <code class="constant">GL_SLUMINANCE_ALPHA</code>,
                    <code class="constant">GL_SLUMINANCE8_ALPHA8</code>,
                    <code class="constant">GL_SRGB</code>,
                    <code class="constant">GL_SRGB8</code>,
                    <code class="constant">GL_SRGB_ALPHA</code>, or
                    <code class="constant">GL_SRGB8_ALPHA8</code>.
                </p></dd><dt><span class="term"><em class="parameter"><code>width</code></em></span></dt><dd><p>
                    Specifies the width of the texture image including the border if any. If the GL version does not support non-power-of-two sizes, this value must be
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                </p></dd><dt><span class="term"><em class="parameter"><code>height</code></em></span></dt><dd><p>
                    Specifies the height of the texture image including the border if any. If the GL version does not support non-power-of-two sizes, this value must be
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                    for some integer
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                    All
                    implementations support texture images that are at least 64 texels
                    high.
                </p></dd><dt><span class="term"><em class="parameter"><code>border</code></em></span></dt><dd><p>
                    Specifies the width of the border.
                    Must be either 0 or 1.
                </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"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> and <a class="citerefentry" href="glDisable"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a> with argument <code class="constant">GL_TEXTURE_2D</code>.  To enable and disable texturing using cube-mapped texture, call <a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> and <a class="citerefentry" href="glDisable"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a> with argument <code class="constant">GL_TEXTURE_CUBE_MAP</code>.
        </p><p>
            To define texture images, call <code class="function">glTexImage2D</code>.
            The arguments describe the parameters of the texture image,
            such as height,
            width,
            width of the border,
            level-of-detail number
            (see <a class="citerefentry" href="glTexParameter"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>),
            and number of color components provided.
            The last three arguments describe how the image is represented in memory;
            they are identical to the pixel formats used for <a class="citerefentry" href="glDrawPixels"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>.
        </p><p>
            If <em class="parameter"><code>target</code></em> is <code class="constant">GL_PROXY_TEXTURE_2D</code> or <code class="constant">GL_PROXY_TEXTURE_CUBE_MAP</code>, no data is read from <em class="parameter"><code>data</code></em>, but
            all of the texture image state is recalculated, checked for
            consistency, and checked
            against the implementation's capabilities. If the implementation cannot
            handle a texture of the requested texture size, it sets
            all of the image state to 0,
            but does not generate an error (see <a class="citerefentry" href="glGetError"><span class="citerefentry"><span class="refentrytitle">glGetError</span></span></a>). To query for an
            entire mipmap array, use an image array level greater than or equal to
            1.
        </p><p>
            If <em class="parameter"><code>target</code></em> is <code class="constant">GL_TEXTURE_2D</code>, or one of the <code class="constant">GL_TEXTURE_CUBE_MAP</code>
            targets, data is read from <em class="parameter"><code>data</code></em> as a sequence of signed or unsigned
            bytes, shorts, or longs, or single-precision floating-point values,
            depending on <em class="parameter"><code>type</code></em>.  These values are grouped into sets of one, two,
            three, or four values, depending on <em class="parameter"><code>format</code></em>, to form elements.  If <em class="parameter"><code>type</code></em>
            is <code class="constant">GL_BITMAP</code>, the data is considered as a string of unsigned bytes
            (and <em class="parameter"><code>format</code></em> must be <code class="constant">GL_COLOR_INDEX</code>).
            Each data byte is treated as eight 1-bit elements,
            with bit ordering determined by <code class="constant">GL_UNPACK_LSB_FIRST</code>
            (see <a class="citerefentry" href="glPixelStore"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>).
        </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"><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><p>
            The first element corresponds to the lower left corner of the texture
            image.
            Subsequent elements progress left-to-right through the remaining texels
            in the lowest row of the texture image, and then in successively higher
            rows of the texture image.
            The final element corresponds to the upper right corner of the texture
            image.
        </p><p>
            <em class="parameter"><code>format</code></em> determines the composition of each element in <em class="parameter"><code>data</code></em>.
            It can assume one of these symbolic values:
        </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_COLOR_INDEX</code></span></dt><dd><p>
                        Each element is a single value,
                        a color index.
                        The GL converts it to fixed point
                        (with an unspecified number of zero bits to the right of the binary point),
                        shifted left or right depending on the value and sign of <code class="constant">GL_INDEX_SHIFT</code>,
                        and added to <code class="constant">GL_INDEX_OFFSET</code>
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                        The resulting index is converted to a set of color components
                        using the
                        <code class="constant">GL_PIXEL_MAP_I_TO_R</code>,
                        <code class="constant">GL_PIXEL_MAP_I_TO_G</code>,
                        <code class="constant">GL_PIXEL_MAP_I_TO_B</code>, and
                        <code class="constant">GL_PIXEL_MAP_I_TO_A</code> tables,
                        and clamped to the range [0,1].
                    </p></dd><dt><span class="term"><code class="constant">GL_RED</code></span></dt><dd><p>
                        Each element is a single red component.
                        The GL converts it to floating point and assembles it into an RGBA element
                        by attaching 0 for green and blue, and 1 for alpha.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_GREEN</code></span></dt><dd><p>
                        Each element is a single green component.
                        The GL converts it to floating point and assembles it into an RGBA element
                        by attaching 0 for red and blue, and 1 for alpha.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_BLUE</code></span></dt><dd><p>
                        Each element is a single blue component.
                        The GL converts it to floating point and assembles it into an RGBA element
                        by attaching 0 for red and green, and 1 for alpha.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_ALPHA</code></span></dt><dd><p>
                        Each element is a single alpha component.
                        The GL converts it to floating point and assembles it into an RGBA element
                        by attaching 0 for red, green, and blue.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_INTENSITY</code></span></dt><dd><p>
                        Each element is a single intensity value.
                        The GL converts it to floating point,
                        then assembles it into an RGBA element by replicating the intensity value
                        three times for red, green, blue, and alpha.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_RGB</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_BGR</code></span></dt><dd><p>
                        Each element is an RGB triple.
                        The GL converts it to floating point and assembles it into an RGBA element
                        by attaching 1 for alpha.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_RGBA</code></span></dt><dd></dd><dt><span class="term"><code class="constant">GL_BGRA</code></span></dt><dd><p>
                        Each element contains all four components.
                        Each component is multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_LUMINANCE</code></span></dt><dd><p>
                        Each element is a single luminance value.
                        The GL converts it to floating point,
                        then assembles it into an RGBA element by replicating the luminance value
                        three times for red, green, and blue and attaching 1 for alpha.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1]
                        (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_LUMINANCE_ALPHA</code></span></dt><dd><p>
                        Each element is a luminance/alpha pair.
                        The GL converts it to floating point,
                        then assembles it into an RGBA element by replicating the luminance value
                        three times for red, green, and blue.
                        Each component is then multiplied by the signed scale factor <code class="constant">GL_c_SCALE</code>,
                        added to the signed bias <code class="constant">GL_c_BIAS</code>,
                        and clamped to the range [0,1] (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd><dt><span class="term"><code class="constant">GL_DEPTH_COMPONENT</code></span></dt><dd><p>
                        Each element is a single depth value.
                        The GL converts it to floating point, multiplies by the signed scale factor
                        <code class="constant">GL_DEPTH_SCALE</code>, adds the signed bias <code class="constant">GL_DEPTH_BIAS</code>,
                        and clamps to the range [0,1] (see <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>).
                    </p></dd></dl></div><p>
            Refer to the <a class="citerefentry" href="glDrawPixels"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a> reference page for a description of
            the acceptable values for the <em class="parameter"><code>type</code></em> parameter.
        </p><p>
            If an application wants to store the texture at a certain
            resolution or in a certain format, it can request the resolution
            and format with <em class="parameter"><code>internalFormat</code></em>. The GL will choose an internal
            representation that closely approximates that requested by <em class="parameter"><code>internalFormat</code></em>, but
            it may not match exactly.
            (The representations specified by <code class="constant">GL_LUMINANCE</code>,
            <code class="constant">GL_LUMINANCE_ALPHA</code>, <code class="constant">GL_RGB</code>,
            and <code class="constant">GL_RGBA</code> must match exactly. The numeric values 1, 2, 3, and 4
            may also be used to specify the above representations.)
        </p><p>
        	If the <em class="parameter"><code>internalFormat</code></em> parameter is one of the generic compressed formats,
        	<code class="constant">GL_COMPRESSED_ALPHA</code>,
        	<code class="constant">GL_COMPRESSED_INTENSITY</code>,
        	<code class="constant">GL_COMPRESSED_LUMINANCE</code>,
        	<code class="constant">GL_COMPRESSED_LUMINANCE_ALPHA</code>,
        	<code class="constant">GL_COMPRESSED_RGB</code>, or
        	<code class="constant">GL_COMPRESSED_RGBA</code>, the GL will replace the internal format with the symbolic constant for a specific internal format and compress the texture before storage.  If no corresponding internal format is available, or the GL can not compress that image for any reason, the internal format is instead replaced with a corresponding base internal format.
        </p><p>
            If the <em class="parameter"><code>internalFormat</code></em> parameter is
            <code class="constant">GL_SRGB</code>,
			<code class="constant">GL_SRGB8</code>,
			<code class="constant">GL_SRGB_ALPHA</code>,
			<code class="constant">GL_SRGB8_ALPHA8</code>,
			<code class="constant">GL_SLUMINANCE</code>,
			<code class="constant">GL_SLUMINANCE8</code>,
			<code class="constant">GL_SLUMINANCE_ALPHA</code>, or
			<code class="constant">GL_SLUMINANCE8_ALPHA8</code>, the texture is treated as if the red, green, blue, or luminance components are encoded in the sRGB color space.    Any alpha component is left unchanged.  The conversion from the sRGB encoded component
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						</msub>
						<mo>≤</mo>
						<mn>0.04045</mn>
					  </mtd>
					</mtr>
					<mtr>
					<mtd columnalign="left">
					<msup>
					  <mrow>
						<mo>(</mo>
						<mfrac>
						  <mrow>
							<msub>
							  <mi>c</mi>
							  <mi>s</mi>
							</msub>
							<mo>+</mo>
							<mn>0.055</mn>
						  </mrow>
						  <mn>1.055</mn>
						</mfrac>
						<mo>)</mo>
					  </mrow>
					  <mn>2.4</mn>
					</msup>
					</mtd>
          			  <mtd columnalign="left">
						<mrow>
						  <mspace width="1ex"></mspace>
						  <mo>if</mo>
						  <mspace width="1ex"></mspace>
						</mrow>
						<msub>
						  <mi mathvariant="italic">c</mi>
						  <mi mathvariant="italic">s</mi>
						</msub>
						<mo>&gt;</mo>
						<mn>0.04045</mn>
					  </mtd>
					</mtr>
				  </mtable>
				</mrow>
				</mrow>
			</math>
		</p><p>
			Assume
			<math overflow="scroll">
								<msub><mi mathvariant="italic">c</mi>
								<mi mathvariant="italic">s</mi>
								</msub>
						</math>
			is the sRGB component in the range [0,1].
       </p><p>
            Use the <code class="constant">GL_PROXY_TEXTURE_2D</code> or <code class="constant">GL_PROXY_TEXTURE_CUBE_MAP</code> target to try out a resolution and
            format. The implementation will
            update and recompute its best match for the requested storage resolution
            and format. To then query this state, call <a class="citerefentry" href="glGetTexLevelParameter"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a>.
            If the texture cannot be accommodated, texture state is set to 0.
        </p><p>
            A one-component texture image uses only the red component of the RGBA
            color extracted from <em class="parameter"><code>data</code></em>.
            A two-component image uses the R and A values.
            A three-component image uses the R, G, and B values.
            A four-component image uses all of the RGBA components.
        </p><p>
			Depth textures can be treated as LUMINANCE, INTENSITY or ALPHA textures during texture filtering and application. Image-based shadowing can be enabled by comparing texture r coordinates to depth texture values to generate a boolean result.  See <a class="citerefentry" href="glTexParameter"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a> for details on texture comparison.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
            Texturing has no effect in color index mode.
        </p><p>
            If the <code class="code">ARB_imaging</code> extension is supported, RGBA elements may
            also be processed by the imaging pipeline.  The following stages may be
            applied to an RGBA color before color component clamping to the range
            <math overflow="scroll">

                <mfenced open="[" close="]">
                    <mn>0</mn>
                    <mn>1</mn>
                </mfenced>
            </math>:
        </p><div class="variablelist"><dl><dt><span class="term">1. Color component replacement by the color table specified for</span></dt><dd><p>
                        <code class="constant">GL_COLOR_TABLE</code>, if enabled. See <a class="citerefentry" href="glColorTable"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>.
                    </p></dd><dt><span class="term">2. Two-dimensional Convolution filtering, if enabled.</span></dt><dd><p>
                        See <a class="citerefentry" href="glConvolutionFilter1D"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter1D</span></span></a>.
                    </p><p>
                        If a convolution filter changes the <em class="parameter"><code>width</code></em> of the texture (by
                        processing with a <code class="constant">GL_CONVOLUTION_BORDER_MODE</code> of <code class="constant">GL_REDUCE</code>, for
                        example), and the GL does not support non-power-of-two textures, the <em class="parameter"><code>width</code></em> must
                        <math overflow="scroll">

                            <mrow>
                                <msup><mn>2</mn>
                                <mi mathvariant="italic">n</mi>
                                </msup>
                                <mo>+</mo>
                                <mrow>
                                    <mn>2</mn>
                                    <mo>⁡</mo>
                                    <mfenced open="(" close=")">
                                        <mi mathvariant="italic">border</mi>
                                    </mfenced>
                                </mrow>
                            </mrow>
                        </math>,
                        for some
                        integer
                        <math overflow="scroll"><mi mathvariant="italic">n</mi></math>,
                        and <em class="parameter"><code>height</code></em> must be
                        <math overflow="scroll">

                            <mrow>
                                <msup><mn>2</mn>
                                <mi mathvariant="italic">m</mi>
                                </msup>
                                <mo>+</mo>
                                <mrow>
                                    <mn>2</mn>
                                    <mo>⁡</mo>
                                    <mfenced open="(" close=")">
                                        <mi mathvariant="italic">border</mi>
                                    </mfenced>
                                </mrow>
                            </mrow>
                        </math>,
                        for some
                        integer
                        <math overflow="scroll"><mi mathvariant="italic">m</mi></math>,
                        after filtering.
                    </p></dd><dt><span class="term">3. RGBA components may be multiplied by <code class="constant">GL_POST_CONVOLUTION_c_SCALE</code>,</span></dt><dd><p>
                        and added to <code class="constant">GL_POST_CONVOLUTION_c_BIAS</code>, if enabled.  See
                        <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>.
                    </p></dd><dt><span class="term">4. Color component replacement by the color table specified for</span></dt><dd><p>
                        <code class="constant">GL_POST_CONVOLUTION_COLOR_TABLE</code>, if enabled.  See <a class="citerefentry" href="glColorTable"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>.
                    </p></dd><dt><span class="term">5. Transformation by the color matrix.</span></dt><dd><p>
                        See <a class="citerefentry" href="glMatrixMode"><span class="citerefentry"><span class="refentrytitle">glMatrixMode</span></span></a>.
                    </p></dd><dt><span class="term">6. RGBA components may be multiplied by <code class="constant">GL_POST_COLOR_MATRIX_c_SCALE</code>,</span></dt><dd><p>
                        and added to <code class="constant">GL_POST_COLOR_MATRIX_c_BIAS</code>, if enabled.  See
                        <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>.
                    </p></dd><dt><span class="term">7. Color component replacement by the color table specified for</span></dt><dd><p>
                        <code class="constant">GL_POST_COLOR_MATRIX_COLOR_TABLE</code>, if enabled.  See <a class="citerefentry" href="glColorTable"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>.
                    </p></dd></dl></div><p>
            The texture image can be represented by the same data formats
            as the pixels in a <a class="citerefentry" href="glDrawPixels"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a> command,
            except that <code class="constant">GL_STENCIL_INDEX</code>
            cannot be used.
            <a class="citerefentry" href="glPixelStore"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a> and <a class="citerefentry" href="glPixelTransfer"><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"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>.
        </p><p>
            <code class="function">glTexImage2D</code> and <code class="constant">GL_PROXY_TEXTURE_2D</code> are available only if the GL
            version is 1.1 or greater.
        </p><p>
            Internal formats other than 1, 2, 3, or 4 may be used only if the GL
            version is 1.1 or greater.
        </p><p>
            In GL version 1.1 or greater, <em class="parameter"><code>data</code></em> may be a null pointer.
            In this case, texture memory is
            allocated to accommodate a texture of width <em class="parameter"><code>width</code></em> and height <em class="parameter"><code>height</code></em>.
            You can then download subtextures to initialize this
            texture memory.
            The image is undefined if the user tries to apply
            an uninitialized portion of the texture image to a primitive.
        </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>
            When the <code class="code">ARB_multitexture</code> extension is supported or the GL version is 1.3 or greater, <code class="function">glTexImage2D</code>
            specifies the two-dimensional texture for the current texture unit,
            specified with <a class="citerefentry" href="glActiveTexture"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>.
        </p><p>
            <code class="constant">GL_TEXTURE_CUBE_MAP</code> and <code class="constant">GL_PROXY_TEXTURE_CUBE_MAP</code> are available only if the GL
            version is 1.3 or greater.
        </p><p>
            <code class="constant">GL_DEPTH_COMPONENT</code>, <code class="constant">GL_DEPTH_COMPONENT16</code>,
            <code class="constant">GL_DEPTH_COMPONENT24</code>, and <code class="constant">GL_DEPTH_COMPONENT32</code> are available only
            if the GL version is 1.4 or greater.
        </p><p>
			Non-power-of-two textures are supported if the GL version is 2.0 or greater, or if the implementation exports the <code class="constant">GL_ARB_texture_non_power_of_two</code> extension.
        </p><p>
            The
			<code class="constant">GL_SRGB</code>,
			<code class="constant">GL_SRGB8</code>,
			<code class="constant">GL_SRGB_ALPHA</code>,
			<code class="constant">GL_SRGB8_ALPHA8</code>,
			<code class="constant">GL_SLUMINANCE</code>,
			<code class="constant">GL_SLUMINANCE8</code>,
			<code class="constant">GL_SLUMINANCE_ALPHA</code>, and
			<code class="constant">GL_SLUMINANCE8_ALPHA8</code>
			internal formats are only available if the GL version is 2.1 or greater.
        </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_PROXY_TEXTURE_2D</code>,
            <code class="constant">GL_PROXY_TEXTURE_CUBE_MAP</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>target</code></em> is one of the six cube map 2D image targets and the width and height parameters are not equal.
        </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>width</code></em> or <em class="parameter"><code>height</code></em> is less than 0
            or greater than 2 + <code class="constant">GL_MAX_TEXTURE_SIZE</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
            <math overflow="scroll">

                <mrow>
                    <msub><mi mathvariant="italic">log</mi>
                    <mn>2</mn>
                    </msub>
                    <mo>⁡</mo>
                    <mfenced open="(" close=")">
                        <mi mathvariant="italic">max</mi>
                    </mfenced>
                </mrow>
            </math>,
            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 <em class="parameter"><code>internalFormat</code></em> is not 1, 2, 3, 4, or one of the
            accepted resolution and format symbolic constants.
        </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
            or greater than 2 + <code class="constant">GL_MAX_TEXTURE_SIZE</code>.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if non-power-of-two textures are not supported and the <em class="parameter"><code>width</code></em> or <em class="parameter"><code>height</code></em> cannot be represented as
            <math overflow="scroll">

                <mrow>
                    <msup><mn>2</mn>
                    <mi mathvariant="italic">k</mi>
                    </msup>
                    <mo>+</mo>
                    <mrow>
                        <mn>2</mn>
                        <mo>⁡</mo>
                        <mfenced open="(" close=")">
                            <mi mathvariant="italic">border</mi>
                        </mfenced>
                    </mrow>
                </mrow>
            </math>
            for some
            integer value of <span class="emphasis"><em>k</em></span>.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>border</code></em> is not 0 or 1.
        </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 <em class="parameter"><code>target</code></em> is not
            <code class="constant">GL_TEXTURE_2D</code> or <code class="constant">GL_PROXY_TEXTURE_2D</code> and <em class="parameter"><code>internalFormat</code></em> is
            <code class="constant">GL_DEPTH_COMPONENT</code>, <code class="constant">GL_DEPTH_COMPONENT16</code>,
            <code class="constant">GL_DEPTH_COMPONENT24</code>, or <code class="constant">GL_DEPTH_COMPONENT32</code>.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>format</code></em> is
            <code class="constant">GL_DEPTH_COMPONENT</code> and <em class="parameter"><code>internalFormat</code></em> is not
            <code class="constant">GL_DEPTH_COMPONENT</code>, <code class="constant">GL_DEPTH_COMPONENT16</code>,
            <code class="constant">GL_DEPTH_COMPONENT24</code>, or <code class="constant">GL_DEPTH_COMPONENT32</code>.
        </p><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>internalFormat</code></em> is
            <code class="constant">GL_DEPTH_COMPONENT</code>, <code class="constant">GL_DEPTH_COMPONENT16</code>,
            <code class="constant">GL_DEPTH_COMPONENT24</code>, or <code class="constant">GL_DEPTH_COMPONENT32</code>, and <em class="parameter"><code>format</code></em> is
            not <code class="constant">GL_DEPTH_COMPONENT</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">glTexImage2D</code>
            is executed between the execution of <a class="citerefentry" href="glBegin"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>
            and the corresponding execution of <a class="citerefentry" href="glEnd"><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"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a>
        </p><p>
            <a class="citerefentry" href="glIsEnabled"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_TEXTURE_2D</code> or <code class="constant">GL_TEXTURE_CUBE_MAP</code>
        </p><p>
            <a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_UNPACK_BUFFER_BINDING</code>
        </p></div>
        {$pipelinestall}{$examples}
        <div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glActiveTexture"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>,
            <a class="citerefentry" href="glColorTable"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>,
            <a class="citerefentry" href="glConvolutionFilter2D"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter2D</span></span></a>,
            <a class="citerefentry" href="glCopyPixels"><span class="citerefentry"><span class="refentrytitle">glCopyPixels</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage1D"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage2D"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage1D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glCopyTexSubImage3D"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glDrawPixels"><span class="citerefentry"><span class="refentrytitle">glDrawPixels</span></span></a>,
            <a class="citerefentry" href="glMatrixMode"><span class="citerefentry"><span class="refentrytitle">glMatrixMode</span></span></a>,
            <a class="citerefentry" href="glPixelStore"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>,
            <a class="citerefentry" href="glPixelTransfer"><span class="citerefentry"><span class="refentrytitle">glPixelTransfer</span></span></a>,
            <a class="citerefentry" href="glSeparableFilter2D"><span class="citerefentry"><span class="refentrytitle">glSeparableFilter2D</span></span></a>,
            <a class="citerefentry" href="glTexEnv"><span class="citerefentry"><span class="refentrytitle">glTexEnv</span></span></a>,
            <a class="citerefentry" href="glTexGen"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>,
            <a class="citerefentry" href="glTexImage1D"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>,
            <a class="citerefentry" href="glTexImage3D"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>,
            <a class="citerefentry" href="glTexSubImage3D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>,
            <a class="citerefentry" href="glTexParameter"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><div id="Copyright"><h2>Copyright</h2><p>
            Copyright © 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div></div>