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242 lines
13 KiB
XML
242 lines
13 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glCompressedTexImage2D">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glCompressedTexImage2D</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glCompressedTexImage2D</refname>
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<refpurpose>specify a two-dimensional texture image in a compressed format</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glCompressedTexImage2D</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLint <parameter>level</parameter></paramdef>
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<paramdef>GLenum <parameter>internalformat</parameter></paramdef>
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<paramdef>GLsizei <parameter>width</parameter></paramdef>
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<paramdef>GLsizei <parameter>height</parameter></paramdef>
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<paramdef>GLint <parameter>border</parameter></paramdef>
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<paramdef>GLsizei <parameter>imageSize</parameter></paramdef>
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<paramdef>const GLvoid * <parameter>data</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>target</parameter></term>
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<listitem>
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<para>
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Specifies the target texture.
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Must be <constant>GL_TEXTURE_2D</constant>, <constant>GL_PROXY_TEXTURE_2D</constant>,
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<constant>GL_TEXTURE_1D_ARRAY</constant>, <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant>,
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<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_X</constant>,
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<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_X</constant>,
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<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_Y</constant>,
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<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</constant>,
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<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_Z</constant>,
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<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</constant>, or
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<constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>level</parameter></term>
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<listitem>
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<para>
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Specifies the level-of-detail number.
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Level 0 is the base image level.
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Level <emphasis>n</emphasis> is the <emphasis>n</emphasis>th mipmap reduction image.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>internalformat</parameter></term>
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<listitem>
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<para>
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Specifies the format of the compressed image data stored at address <parameter>data</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>width</parameter></term>
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<listitem>
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<para>
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Specifies the width of the texture image.
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All implementations support 2D texture images that are at least 64 texels
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wide and cube-mapped texture images that are at least 16 texels wide.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>height</parameter></term>
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<listitem>
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<para>
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Specifies the height of the texture image.
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All implementations support 2D texture images that are at least 64 texels
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high and cube-mapped texture images that are at least 16 texels high.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>border</parameter></term>
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<listitem>
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<para>
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This value must be 0.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>imageSize</parameter></term>
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<listitem>
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<para>
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Specifies the number of unsigned bytes of image data starting at the
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address specified by <parameter>data</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>data</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to the compressed image data in memory.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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Texturing allows elements of an image array to be read by shaders.
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</para>
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<para>
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<function>glCompressedTexImage2D</function> loads a previously defined, and retrieved, compressed two-dimensional
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texture image if <parameter>target</parameter> is <constant>GL_TEXTURE_2D</constant>, or one of the
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cube map faces such as <constant>GL_TEXTURE_CUBE_MAP_POSITIVE_X</constant>.
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(see <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>).
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</para>
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<para>
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If <parameter>target</parameter> is <constant>GL_TEXTURE_1D_ARRAY</constant>, <parameter>data</parameter>
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is treated as an array of compressed 1D textures.
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</para>
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<para>
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If <parameter>target</parameter> is <constant>GL_PROXY_TEXTURE_2D</constant>, <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant>
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or <constant>GL_PROXY_CUBE_MAP</constant>, no data is read from <parameter>data</parameter>, but
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all of the texture image state is recalculated, checked for consistency,
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and checked against the implementation's capabilities. If the
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implementation cannot handle a texture of the requested texture size, it
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sets all of the image state to 0, but does not generate an error (see
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<citerefentry><refentrytitle>glGetError</refentrytitle></citerefentry>). To query for an entire mipmap array,
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use an image array level greater than or equal to 1.
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</para>
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<para>
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<parameter>internalformat</parameter> must be a known compressed image format (such as <constant>GL_RGTC</constant>)
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or an extension-specified compressed-texture format.
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When a texture is loaded with <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry> using a generic compressed
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texture format (e.g., <constant>GL_COMPRESSED_RGB</constant>), the GL selects from one of
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its extensions supporting compressed textures. In order to load the
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compressed texture image using <function>glCompressedTexImage2D</function>, query the compressed texture image's
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size and format using <citerefentry><refentrytitle>glGetTexLevelParameter</refentrytitle></citerefentry>.
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</para>
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<para>
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If a non-zero named buffer object is bound to the <constant>GL_PIXEL_UNPACK_BUFFER</constant> target
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(see <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>) while a texture image is
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specified, <parameter>data</parameter> is treated as a byte offset into the buffer object's data store.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>internalformat</parameter> is not one of the generic
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compressed internal formats:
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<constant>GL_COMPRESSED_RED</constant>,
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<constant>GL_COMPRESSED_RG</constant>,
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<constant>GL_COMPRESSED_RGB</constant>,
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<constant>GL_COMPRESSED_RGBA</constant>.
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<constant>GL_COMPRESSED_SRGB</constant>, or
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<constant>GL_COMPRESSED_SRGB_ALPHA</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>imageSize</parameter> is not consistent with
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the format, dimensions, and contents of the specified compressed image
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data.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>border</parameter> is not 0.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if parameter combinations are not
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supported by the specific compressed internal format as specified in the
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specific texture compression extension.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and the buffer object's data store is currently mapped.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and the data would be unpacked from the buffer
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object such that the memory reads required would exceed the data store size.
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</para>
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<para>
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Undefined results, including abnormal program termination, are generated if
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<parameter>data</parameter> is not encoded in a manner consistent with the extension
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specification defining the internal compression format.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGetCompressedTexImage</refentrytitle></citerefentry>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_COMPRESSED</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_UNPACK_BUFFER_BINDING</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGetTexLevelParameter</refentrytitle></citerefentry> with arguments <constant>GL_TEXTURE_INTERNAL_FORMAT</constant>
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and <constant>GL_TEXTURE_COMPRESSED_IMAGE_SIZE</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCompressedTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCompressedTexImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCompressedTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCompressedTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCompressedTexSubImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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