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399 lines
19 KiB
XML
399 lines
19 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="glTexSubImage2D">
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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>glTexSubImage2D</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glTexSubImage2D</refname>
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<refpurpose>specify a two-dimensional texture subimage</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>glTexSubImage2D</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>GLint <parameter>yoffset</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>GLenum <parameter>format</parameter></paramdef>
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<paramdef>GLenum <parameter>type</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_2D</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>,
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or <constant>GL_TEXTURE_1D_ARRAY</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>yoffset</parameter></term>
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<listitem>
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<para>
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Specifies a texel offset in the y 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>height</parameter></term>
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<listitem>
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<para>
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Specifies the height 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 pixel data.
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The following symbolic values are accepted:
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<constant>GL_RED</constant>,
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<constant>GL_RG</constant>,
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<constant>GL_RGB</constant>,
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<constant>GL_BGR</constant>,
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<constant>GL_RGBA</constant>,
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<constant>GL_BGRA</constant>,
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<constant>GL_DEPTH_COMPONENT</constant>, and
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<constant>GL_STENCIL_INDEX</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>type</parameter></term>
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<listitem>
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<para>
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Specifies the data type of the pixel data.
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The following symbolic values are accepted:
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<constant>GL_UNSIGNED_BYTE</constant>,
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<constant>GL_BYTE</constant>,
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<constant>GL_UNSIGNED_SHORT</constant>,
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<constant>GL_SHORT</constant>,
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<constant>GL_UNSIGNED_INT</constant>,
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<constant>GL_INT</constant>,
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<constant>GL_FLOAT</constant>,
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<constant>GL_UNSIGNED_BYTE_3_3_2</constant>,
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<constant>GL_UNSIGNED_BYTE_2_3_3_REV</constant>,
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<constant>GL_UNSIGNED_SHORT_5_6_5</constant>,
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<constant>GL_UNSIGNED_SHORT_5_6_5_REV</constant>,
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<constant>GL_UNSIGNED_SHORT_4_4_4_4</constant>,
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<constant>GL_UNSIGNED_SHORT_4_4_4_4_REV</constant>,
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<constant>GL_UNSIGNED_SHORT_5_5_5_1</constant>,
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<constant>GL_UNSIGNED_SHORT_1_5_5_5_REV</constant>,
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<constant>GL_UNSIGNED_INT_8_8_8_8</constant>,
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<constant>GL_UNSIGNED_INT_8_8_8_8_REV</constant>,
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<constant>GL_UNSIGNED_INT_10_10_10_2</constant>, and
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<constant>GL_UNSIGNED_INT_2_10_10_10_REV</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>data</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to the 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 maps a portion of a specified texture image
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onto each graphical primitive for which texturing is enabled.
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</para>
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<para>
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<function>glTexSubImage2D</function> redefines a contiguous subregion of an existing two-dimensional
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or one-dimensional arary texture image.
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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,
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and y indices <parameter>yoffset</parameter> and
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<inlineequation><mml:math>
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<!-- eqn: yoffset + height - 1: -->
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<mml:mrow>
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<mml:mi mathvariant="italic">yoffset</mml:mi>
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<mml:mo>+</mml:mo>
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<mml:mi mathvariant="italic">height</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.
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This region may not include any texels outside the range of the
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texture array as it was originally specified.
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It is not an error to specify a subtexture with zero width or height, but
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such a specification has no effect.
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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="notes"><title>Notes</title>
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<para>
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<citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry> modes affect texture images.
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</para>
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<para>
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<function>glTexSubImage2D</function> specifies a two-dimensional subtexture for the current texture unit,
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specified with <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
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</para>
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<para>
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<constant>GL_STENCIL_INDEX</constant> is accepted for <parameter>format</parameter> only if the GL version
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is 4.4 or higher.
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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>target</parameter> is not <constant>GL_TEXTURE_2D</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_TEXTURE_1D_ARRAY</constant>.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>format</parameter> is not an accepted
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format constant.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>type</parameter> is not a type constant.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>level</parameter> is less than 0.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> may be generated if <parameter>level</parameter> is greater
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than
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<inlineequation><mml:math>
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<!-- eqn: log sub 2: -->
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<mml:msub><mml:mi mathvariant="italic">log</mml:mi>
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<mml:mn>2</mml:mn>
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</mml:msub>
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</mml:math></inlineequation>
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<emphasis>max</emphasis>,
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where <emphasis>max</emphasis> is the returned value of <constant>GL_MAX_TEXTURE_SIZE</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if
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<inlineequation><mml:math>
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<!-- eqn: xoffset < -b: -->
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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:mrow>
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<mml:mo>-</mml:mo>
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<mml:mi mathvariant="italic">b</mml:mi>
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</mml:mrow>
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</mml:mrow>
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</mml:math></inlineequation>,
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<inlineequation><mml:math>
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<!-- eqn: (xoffset + width) > (w - b): -->
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<mml:mrow>
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<mml:mfenced open="(" close=")">
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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:mrow>
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</mml:mfenced>
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<mml:mo>></mml:mo>
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<mml:mfenced open="(" close=")">
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<mml:mrow>
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<mml:mi mathvariant="italic">w</mml:mi>
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<mml:mo>-</mml:mo>
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<mml:mi mathvariant="italic">b</mml:mi>
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</mml:mrow>
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</mml:mfenced>
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</mml:mrow>
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</mml:math></inlineequation>,
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<inlineequation><mml:math>
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<!-- eqn: yoffset < -b: -->
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<mml:mrow>
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<mml:mi mathvariant="italic">yoffset</mml:mi>
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<mml:mo><</mml:mo>
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<mml:mrow>
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<mml:mo>-</mml:mo>
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<mml:mi mathvariant="italic">b</mml:mi>
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</mml:mrow>
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</mml:mrow>
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</mml:math></inlineequation>,
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or
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<inlineequation><mml:math>
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<!-- eqn: (yoffset + height) > (h - b): -->
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<mml:mrow>
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<mml:mfenced open="(" close=")">
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<mml:mrow>
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<mml:mi mathvariant="italic">yoffset</mml:mi>
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<mml:mo>+</mml:mo>
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<mml:mi mathvariant="italic">height</mml:mi>
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</mml:mrow>
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</mml:mfenced>
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<mml:mo>></mml:mo>
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<mml:mfenced open="(" close=")">
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<mml:mrow>
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<mml:mi mathvariant="italic">h</mml:mi>
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<mml:mo>-</mml:mo>
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<mml:mi mathvariant="italic">b</mml:mi>
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</mml:mrow>
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</mml:mfenced>
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</mml:mrow>
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</mml:math></inlineequation>,
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where
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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is the <constant>GL_TEXTURE_WIDTH</constant>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math></inlineequation>
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is the <constant>GL_TEXTURE_HEIGHT</constant>, and
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<inlineequation><mml:math><mml:mi mathvariant="italic">b</mml:mi></mml:math></inlineequation>
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is the border width
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of the texture image being modified.
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Note that
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math></inlineequation>
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include twice the border width.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>width</parameter> or <parameter>height</parameter> is less than 0.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the texture array has not
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been defined by a previous <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry> operation.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>type</parameter> is one of
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<constant>GL_UNSIGNED_BYTE_3_3_2</constant>,
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<constant>GL_UNSIGNED_BYTE_2_3_3_REV</constant>,
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<constant>GL_UNSIGNED_SHORT_5_6_5</constant>, or
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<constant>GL_UNSIGNED_SHORT_5_6_5_REV</constant>
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and <parameter>format</parameter> is not <constant>GL_RGB</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>type</parameter> is one of
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<constant>GL_UNSIGNED_SHORT_4_4_4_4</constant>,
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<constant>GL_UNSIGNED_SHORT_4_4_4_4_REV</constant>,
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<constant>GL_UNSIGNED_SHORT_5_5_5_1</constant>,
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<constant>GL_UNSIGNED_SHORT_1_5_5_5_REV</constant>,
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<constant>GL_UNSIGNED_INT_8_8_8_8</constant>,
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<constant>GL_UNSIGNED_INT_8_8_8_8_REV</constant>,
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<constant>GL_UNSIGNED_INT_10_10_10_2</constant>, or
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<constant>GL_UNSIGNED_INT_2_10_10_10_REV</constant>
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and <parameter>format</parameter> is neither <constant>GL_RGBA</constant> nor <constant>GL_BGRA</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>format</parameter> is <constant>GL_STENCIL_INDEX</constant>
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and the base internal format is not <constant>GL_STENCIL_INDEX</constant>.
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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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<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 <parameter>data</parameter> is not evenly divisible
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into the number of bytes needed to store in memory a datum indicated by <parameter>type</parameter>.
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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>glGetTexImage</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_PIXEL_UNPACK_BUFFER_BINDING</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>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>glTexImage1D</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>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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