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216 lines
11 KiB
XML
216 lines
11 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="glCompressedTexSubImage1D">
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<refentryinfo>
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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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</refentryinfo>
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<refmeta>
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<refentrytitle>glCompressedTexSubImage1D</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glCompressedTexSubImage1D</refname>
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<refpurpose>specify a one-dimensional texture subimage 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>glCompressedTexSubImage1D</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>GLint <parameter>xoffset</parameter></paramdef>
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<paramdef>GLsizei <parameter>width</parameter></paramdef>
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<paramdef>GLenum <parameter>format</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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<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_1D</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>xoffset</parameter></term>
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<listitem>
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<para>
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Specifies a texel offset in the x direction within the texture array.
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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 subimage.
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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>format</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>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>glCompressedTexSubImage1D</function> redefines a contiguous subregion of an existing one-dimensional
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texture image. The texels referenced by <parameter>data</parameter> replace the portion of the
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existing texture array with x indices <parameter>xoffset</parameter> and
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<inlineequation><mml:math>
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<!-- eqn: xoffset + width - 1: -->
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<mml:mrow>
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<mml:mi mathvariant="italic">xoffset</mml:mi>
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<mml:mo>+</mml:mo>
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<mml:mi mathvariant="italic">width</mml:mi>
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<mml:mo>-</mml:mo>
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<mml:mn>1</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>,
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inclusive. This region may not include any texels
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outside the range of the texture array as it was originally specified. It
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is not an error to specify a subtexture with width of 0, but such a
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specification has no effect.
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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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The <parameter>format</parameter> of the compressed texture
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image is selected by the GL implementation that compressed it (see
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<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>), and should be queried at the time the texture was
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compressed with <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_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>glCompressedTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCompressedTexImage3D</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>glCopyTexImage2D</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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