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286 lines
13 KiB
XML
286 lines
13 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>2013</year>
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<holder>Khronos Group</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.
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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_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>,
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<constant>GL_COMPRESSED_SRGB_ALPHA</constant>.
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<constant>GL_DEPTH_COMPONENT</constant>,
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<constant>GL_DEPTH_COMPONENT16</constant>,
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<constant>GL_DEPTH_COMPONENT24</constant>,
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<constant>GL_DEPTH_COMPONENT32</constant>,
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<constant>GL_STENCIL_INDEX8</constant>,
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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_R3_G3_B2</constant>,
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<constant>GL_RGB4</constant>,
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<constant>GL_RGB5</constant>,
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<constant>GL_RGB8</constant>,
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<constant>GL_RGB10</constant>,
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<constant>GL_RGB12</constant>,
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<constant>GL_RGB16</constant>,
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<constant>GL_RGBA</constant>,
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<constant>GL_RGBA2</constant>,
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<constant>GL_RGBA4</constant>,
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<constant>GL_RGB5_A1</constant>,
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<constant>GL_RGBA8</constant>,
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<constant>GL_RGB10_A2</constant>,
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<constant>GL_RGBA12</constant>,
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<constant>GL_RGBA16</constant>,
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<constant>GL_SRGB</constant>,
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<constant>GL_SRGB8</constant>,
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<constant>GL_SRGB_ALPHA</constant>, or
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<constant>GL_SRGB8_ALPHA8</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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</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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</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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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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<function>glCopyTexImage2D</function> defines a two-dimensional texture image, or cube-map texture image
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with pixels from the current
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<constant>GL_READ_BUFFER</constant>.
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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
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<inlineequation><mml:math>
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<mml:mi mathvariant="italic">width</mml:mi>
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</mml:math></inlineequation>
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and a height of
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<inlineequation><mml:math>
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<mml:mi mathvariant="italic">height</mml:mi>
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</mml:math></inlineequation>
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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, but the process stops just before
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final conversion.
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At this point all pixel component values are clamped 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 converted 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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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 of the current
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<constant>GL_READ_BUFFER</constant> are outside the window 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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When <parameter>internalformat</parameter> is one of the sRGB types, the GL does not automatically convert the source pixels to the sRGB color space. In this case, the <function>glPixelMap</function> function can be used to accomplish the conversion.
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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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1, 2, 3, and 4 are not accepted values for <parameter>internalformat</parameter>.
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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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<constant>GL_STENCIL_INDEX8</constant> is accepted for <parameter>internalformat</parameter> only
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if the GL version 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>, 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 <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>.
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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> is less than 0
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or greater than
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<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 <parameter>border</parameter> is not 0.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</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_OPERATION</constant> is generated if <parameter>internalformat</parameter> is
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<constant>GL_DEPTH_COMPONENT</constant>, <constant>GL_DEPTH_COMPONENT16</constant>,
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<constant>GL_DEPTH_COMPONENT24</constant>, or <constant>GL_DEPTH_COMPONENT32</constant> and there is no depth
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buffer.
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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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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glCopyTexImage1D</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>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>glTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage2D</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.
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Copyright <trademark class="copyright"></trademark> 2012-2013 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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<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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