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268 lines
13 KiB
XML
268 lines
13 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glCopyTexImage2D">
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<info>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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<copyright>
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<year>2010-2014</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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<refmeta>
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<refentrytitle>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>
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<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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<refsect1 xml:id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>target</parameter></term>
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<listitem>
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<para>
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Specifies the target texture.
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Must be <constant>GL_TEXTURE_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>,
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<constant>GL_RGBA</constant>,
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<constant>GL_R8</constant>,
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<constant>GL_RG8</constant>,
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<constant>GL_RGB565</constant>,
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<constant>GL_RGB8</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_SRGB8</constant>,
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<constant>GL_SRGB8_ALPHA8</constant>,
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<constant>GL_R8I</constant>,
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<constant>GL_R8UI</constant>,
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<constant>GL_R16I</constant>,
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<constant>GL_R16UI</constant>,
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<constant>GL_R32I</constant>,
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<constant>GL_R32UI</constant>,
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<constant>GL_RG8I</constant>,
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<constant>GL_RG8UI</constant>,
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<constant>GL_RG16I</constant>,
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<constant>GL_RG16UI</constant>,
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<constant>GL_RG32I</constant>,
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<constant>GL_RG32UI</constant>,
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<constant>GL_RGBA8I</constant>,
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<constant>GL_RGBA8UI</constant>,
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<constant>GL_RGB10_A2UI</constant>,
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<constant>GL_RGBA16I</constant>,
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<constant>GL_RGBA16UI</constant>,
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<constant>GL_RGBA32I</constant>,
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<constant>GL_RGBA32UI</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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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 xml: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 <parameter>width</parameter>
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and a height of <parameter>height</parameter> 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 after
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conversion to RGBA values. The error <constant>GL_INVALID_OPERATION</constant> is generated if integer RGBA data is
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required and the format of the current color buffer is not integer; or if floating- or fixed-point RGBA
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data is required and the format of the current color buffer is integer.
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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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><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.
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</para>
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</refsect1>
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<refsect1 xml:id="notes"><title>Notes</title>
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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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</refsect1>
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<refsect1 xml:id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
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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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><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> or
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<parameter>height</parameter> is less than 0 or greater than <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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</refsect1>
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<refsect1 xml:id="versions">
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<title>API Version Support</title>
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<informaltable>
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<tgroup cols="4" align="left">
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
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<tbody>
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<row>
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<entry>glCopyTexImage2D</entry>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 xml:id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPixelStorei</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</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 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 1991-2006 Silicon Graphics, Inc.
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Copyright <trademark class="copyright"/> 2010-2014 Khronos Group.
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This document is licensed under the SGI Free Software B License.
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For details, see
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</link>.
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</para>
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</refsect1>
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</refentry>
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