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329 lines
15 KiB
XML
329 lines
15 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="glCopyTexSubImage2D">
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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>glCopyTexSubImage2D</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glCopyTexSubImage2D</refname>
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<refpurpose>copy 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>glCopyTexSubImage2D</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>GLint <parameter>x</parameter></paramdef>
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<paramdef>GLint <parameter>y</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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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<para>
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</para>
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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 of the active texture unit.
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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>, or
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<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</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>x</parameter></term>
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<term><parameter>y</parameter></term>
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<listitem>
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<para>
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Specify the window coordinates of the lower left corner
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of the rectangular region of pixels to be copied.
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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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</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
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active. Texturing is active when the current fragment shader or
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vertex shader makes use of built-in texture lookup
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functions.
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</para>
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<para>
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<function>glCopyTexSubImage2D</function> replaces a rectangular portion of a two-dimensional texture image or
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cube-map texture image with pixels from the current framebuffer
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(rather than from client memory, as is the case for <citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>).
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</para>
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<para>
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The screen-aligned pixel rectangle with lower left corner at
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<inlineequation><mml:math>
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<!-- eqn: (x, y):-->
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<mml:mfenced open="(" close=")">
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<mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">y</mml:mi>
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</mml:mfenced>
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</mml:math></inlineequation>
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and with
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width <parameter>width</parameter> and height <parameter>height</parameter> replaces the portion of the
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texture array with x indices <parameter>xoffset</parameter> through
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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, and y indices <parameter>yoffset</parameter> through
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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, at the mipmap level specified by <parameter>level</parameter>.
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</para>
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<para>
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The pixels in the rectangle are processed exactly as if
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<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry> had been called with
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<parameter>format</parameter> set to <constant>GL_RGBA</constant>, but the process stops just after
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conversion of RGBA values. Subsequent processing is identical to that
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described for <citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
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beginning with the clamping of the R, G, B, and A values to the range
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<inlineequation><mml:math>
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<!-- eqn: [0,1]:-->
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<mml:mfenced open="[" close="]">
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<mml:mn>0</mml:mn>
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<mml:mn>1</mml:mn>
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</mml:mfenced>
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</mml:math></inlineequation>
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and then conversion to the texture's internal format for storage in the texel
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array.
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</para>
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<para>
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The destination rectangle in the texture array may not include any texels
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outside the 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 any of the pixels within the specified rectangle are outside the framebuffer associated with the current
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rendering context, then the values obtained for those pixels are undefined.
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</para>
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<para>
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No change is made to the <emphasis>internalformat</emphasis>, <emphasis>width</emphasis>, or
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<emphasis>height</emphasis> parameters of the specified texture
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array or to texel values outside the specified subregion.
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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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<function>glCopyTexSubImage2D</function>
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specifies the two-dimensional or cube-map texture 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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</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>, or
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<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</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
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<inlineequation><mml:math>
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<!-- eqn: level > log sub 2(max):-->
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<mml:mrow>
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<mml:mi mathvariant="italic">level</mml:mi>
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<mml:mo>></mml:mo>
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<mml:mrow>
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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:mo>⁡</mml:mo>
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<mml:mfenced open="(" close=")">
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<mml:mi mathvariant="italic">max</mml:mi>
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</mml:mfenced>
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</mml:mrow>
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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">max</mml:mi></mml:math></inlineequation>
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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 < 0:-->
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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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0
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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:-->
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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:mi mathvariant="italic">w</mml:mi>
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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 < 0:-->
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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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0
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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:-->
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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:mi mathvariant="italic">h</mml:mi>
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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 width and
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<inlineequation><mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math></inlineequation>
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is the height of the texture image being modified.
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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 been
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defined by a previous <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry> or <citerefentry><refentrytitle>glCopyTexImage2D</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
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the currently bound framebuffer's format does not contain a superset of
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the components required by the texture's base internal format.
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</para>
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<para>
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<constant>GL_INVALID_FRAMEBUFFER_OPERATION</constant> is generated if
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the currently bound framebuffer is not framebuffer complete (i.e. the
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return value from <citerefentry><refentrytitle>glCheckFramebufferStatus</refentrytitle></citerefentry>
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is not <constant>GL_FRAMEBUFFER_COMPLETE</constant>).
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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>glGet</refentrytitle></citerefentry>
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with argument <constant>GL_MAX_TEXTURE_SIZE</constant> or
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<constant>GL_MAX_CUBE_MAP_TEXTURE_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>glCheckFramebufferStatus</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage2D</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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