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320 lines
18 KiB
XML
320 lines
18 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glCompressedTexImage1D">
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<info>
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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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<copyright>
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<year>2011-2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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<refmeta>
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<refentrytitle>glCompressedTexImage1D</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glCompressedTexImage1D</refname>
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<refpurpose>specify a one-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>glCompressedTexImage1D</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>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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<refsect1 xml: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> or <constant>GL_PROXY_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>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 texture images that are at least 64 texels wide. The height of the 1D texture image is 1.
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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 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 xml: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>glCompressedTexImage1D</function> loads a previously defined, and retrieved, compressed
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one-dimensional texture image if <parameter>target</parameter> is <constant>GL_TEXTURE_1D</constant>
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(see <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>).
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</para>
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<para>
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If <parameter>target</parameter> is <constant>GL_PROXY_TEXTURE_1D</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, 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 <citerefentry><refentrytitle>glGetError</refentrytitle></citerefentry>). To query for an entire mipmap array, 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 an extension-specified compressed-texture format.
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When a texture is loaded with
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<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry> using a generic compressed texture format
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(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>glCompressedTexImage1D</function>, query the compressed texture image's size and
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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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<para>
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If the compressed data are arranged into fixed-size blocks of texels, the pixel
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storage modes can be used to select a sub-rectangle from a larger containing rectangle.
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These pixel storage modes operate in the same way as they do for <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>.
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In the following description, denote by
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>h</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>, and
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>d</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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the values of pixel storage modes <constant>GL_UNPACK_COMPRESSED_BLOCK_SIZE</constant>,
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<constant>GL_UNPACK_COMPRESSED_BLOCK_WIDTH</constant>, <constant>GL_UNPACK_COMPRESSED_BLOCK_HEIGHT</constant>,
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and <constant>GL_UNPACK_COMPRESSED_BLOCK_DEPTH</constant>, respectively.
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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is the compressed block size in bytes;
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>h</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>, and
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>d</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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are the compressed block width, height, and depth in pixels.
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</para>
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<para>
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By default the pixel storage modes <constant>GL_UNPACK_ROW_LENGTH</constant>,
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<constant>GL_UNPACK_SKIP_ROWS</constant>, <constant>GL_UNPACK_SKIP_PIXELS</constant>,
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<constant>GL_UNPACK_IMAGE_HEIGHT</constant> and <constant>GL_UNPACK_SKIP_IMAGES</constant>
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are ignored for compressed images. To enable <constant>GL_UNPACK_SKIP_PIXELS</constant>
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and <constant>GL_UNPACK_ROW_LENGTH</constant>,
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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and
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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must both be non-zero.
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To also enable <constant>GL_UNPACK_SKIP_ROWS</constant> and <constant>GL_UNPACK_IMAGE_HEIGHT</constant>,
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>h</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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must be non-zero.
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To also enable <constant>GL_UNPACK_SKIP_IMAGES</constant>,
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>d</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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must be non-zero. All parameters must be consistent with the compressed format to produce the desired results.
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</para>
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<para>
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When selecting a sub-rectangle from a compressed image,
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<itemizedlist>
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<listitem>
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<para>
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the value of <constant>GL_UNPACK_SKIP_PIXELS</constant> must be a multiple of
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>
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</inlineequation>
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</para>
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</listitem>
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</itemizedlist>
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</para>
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<para>
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<parameter>imageSize</parameter> must be equal to:
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</para>
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<para>
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<inlineequation>
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="block" overflow="scroll">
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<mml:mrow>
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<mml:msub>
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<mml:mi>b</mml:mi>
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<mml:mi>s</mml:mi>
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</mml:msub>
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<mml:mo lspace="2px" rspace="2px">×</mml:mo>
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<mml:mfenced open="⌈" close="⌉">
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<mml:mfrac>
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<mml:mi>width</mml:mi>
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<mml:msub>
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<mml:mi>b</mml:mi>
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<mml:mi>w</mml:mi>
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</mml:msub>
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</mml:mfrac>
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</mml:mfenced>
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</mml:mrow>
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</mml:math>
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</inlineequation>
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</para>
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</refsect1>
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<refsect1 xml: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
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a supported specific compressed internal formats, or is 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 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 xml: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_NUM_COMPRESSED_TEXTURE_FORMATS</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_COMPRESSED_TEXTURE_FORMATS</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 xml: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>glCompressedTexImage2D</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>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 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 1991-2006 Silicon Graphics, Inc.
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Copyright <trademark class="copyright"/> 2011-2013 Khronos Group.
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This document is licensed under the SGI
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Free Software B License. For details, see
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</link>.
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</para>
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</refsect1>
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</refentry>
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