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283 lines
14 KiB
XML
283 lines
14 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="glCopyTexImage2D">
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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>glCopyTexImage2D</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glCopyTexImage2D</refname>
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<refpurpose>copy pixels into a 2D texture image</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>glCopyTexImage2D</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>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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<paramdef>GLint <parameter>border</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>target</parameter></term>
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<listitem>
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<para>
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Specifies the target texture 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>internalformat</parameter></term>
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<listitem>
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<para>
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Specifies the internal format of the texture.
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Must be one of the following symbolic constants:
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<constant>GL_ALPHA</constant>,
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<constant>GL_LUMINANCE</constant>,
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<constant>GL_LUMINANCE_ALPHA</constant>,
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<constant>GL_RGB</constant>, or
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<constant>GL_RGBA</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>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 image.
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All implementations support 2D texture images that are at least 64 texels
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wide and cube-mapped texture images that are at least 16 texels wide.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>height</parameter></term>
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<listitem>
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<para>
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Specifies the height of the texture image.
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All implementations support 2D texture images that are at least 64 texels
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high and cube-mapped texture images that are at least 16 texels high.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>border</parameter></term>
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<listitem>
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<para>
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Specifies the width of the border.
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Must be 0.
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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>glCopyTexImage2D</function> defines a two-dimensional texture image or cube-map texture image
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with pixels from the current framebuffer (rather than from
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client memory, as is the case for <citerefentry><refentrytitle>glTexImage2D</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 (<parameter>x</parameter>,
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<parameter>y</parameter>) and with a width of <parameter>width</parameter>
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and a height of <parameter>height</parameter>
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defines the texture array
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at the mipmap level specified by <parameter>level</parameter>.
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<parameter>internalformat</parameter> specifies the internal format of the texture array.
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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>glTexImage2D</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 components required for <parameter>internalformat</parameter> must be a subset of
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those present in the framebuffer's format. For example, a <constant>GL_RGBA</constant>
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framebuffer can be used to supply components for any <parameter>internalformat</parameter>.
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However, a <constant>GL_RGB</constant> framebuffer can only be used to supply components for
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<constant>GL_RGB</constant> or <constant>GL_LUMINANCE</constant> base internal format textures,
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not <constant>GL_ALPHA</constant>, <constant>GL_LUMINANCE_ALPHA</constant>, or
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<constant>GL_RGBA</constant> textures.
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</para>
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<para>
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Pixel ordering is such that lower
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
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screen coordinates correspond to
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lower
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<inlineequation><mml:math><mml:mi mathvariant="italic">s</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">t</mml:mi></mml:math></inlineequation>
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texture coordinates.
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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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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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A GL implementation may choose to store the texture
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array at any internal resolution it chooses.
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</para>
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<para>
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An image with height or width of 0 indicates a NULL texture.
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</para>
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<para>
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<function>glCopyTexImage2D</function>
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specifies a 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_ENUM</constant> is generated if <parameter>internalformat</parameter> is not an
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accepted format.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>target</parameter> is one of the six cube map 2D image targets and the width and height parameters are not equal.
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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 max:-->
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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:mi mathvariant="italic">max</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">max</mml:mi></mml:math></inlineequation>
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is the returned value of <constant>GL_MAX_TEXTURE_SIZE</constant> when <parameter>target</parameter>
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is <constant>GL_TEXTURE_2D</constant> or <constant>GL_MAX_CUBE_MAP_TEXTURE_SIZE</constant> when
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<parameter>target</parameter> is not <constant>GL_TEXTURE_2D</constant>.
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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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or greater than <constant>GL_MAX_TEXTURE_SIZE</constant> when <parameter>target</parameter>
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is <constant>GL_TEXTURE_2D</constant> or <constant>GL_MAX_CUBE_MAP_TEXTURE_SIZE</constant> when
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<parameter>target</parameter> is not <constant>GL_TEXTURE_2D</constant>.
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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
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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 base format of <parameter>internalformat</parameter>.
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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>glCompressedTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCompressedTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage2D</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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