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407 lines
20 KiB
XML
407 lines
20 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="glClearTexSubImage">
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<refentryinfo>
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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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</refentryinfo>
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<refmeta>
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<refentrytitle>glClearTexSubImage</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glClearTexSubImage</refname>
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<refpurpose>fills all or part of a texture image with a constant value</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>glClearTexSubImage</function></funcdef>
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<paramdef>GLuint <parameter>texture</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>zoffset</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>GLsizei <parameter>depth</parameter></paramdef>
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<paramdef>GLenum <parameter>format</parameter></paramdef>
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<paramdef>GLenum <parameter>type</parameter></paramdef>
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<paramdef>const void * <parameter>data</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>texture</parameter></term>
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<listitem>
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<para>
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The name of an existing texture object containing the image to be cleared.
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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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The level of <parameter>texture</parameter> containing the region to be cleared.
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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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The coordinate of the left edge of the region to be cleared.
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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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The coordinate of the lower edge of the region to be cleared.
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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>zoffset</parameter></term>
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<listitem>
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<para>
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The coordinate of the front of the region to be cleared.
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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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The width of the region to be cleared.
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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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The height of the region to be cleared.
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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>depth</parameter></term>
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<listitem>
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<para>
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The depth of the region to be cleared.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>format</parameter></term>
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<listitem>
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<para>
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The format of the data whose address in memory is given by <parameter>data</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>type</parameter></term>
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<listitem>
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<para>
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The type of the data whose address in memory is given by <parameter>data</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>data</parameter></term>
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<listitem>
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<para>
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The address in memory of the data to be used to clear the specified region.
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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>glClearTexSubImage</function> fills all or part of an image contained in a
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texture with an application supplied value. <parameter>texture</parameter> must be
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the name of an existing texture. Further, <parameter>texture</parameter> may not be
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the name of a buffer texture, nor may its internal format be compressed.
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</para>
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<para>
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Arguments <parameter>xoffset</parameter>, <parameter>yoffset</parameter>, and
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<parameter>zoffset</parameter> specify the lower left texel coordinates of
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a width-wide by height-high by depth-deep rectangular subregion of the texel array.
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</para>
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<para>
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For one-dimensional array textures, <parameter>yoffset</parameter> is interpreted as the first layer to
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be cleared and <parameter>height</parameter> is the number of layers to clear. For two-dimensional array
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textures, <parameter>zoffset</parameter> is interpreted as the first layer to be cleared and <parameter>depth</parameter> is the number
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of layers to clear. Cube map textures are treated as an array of six slices in the z-dimension,
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where the value of <parameter>zoffset</parameter> is interpreted as specifying the cube map face
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for the corresponding layer and <parameter>depth</parameter> is the number of faces to clear.
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For cube map array textures, <parameter>zoffset</parameter> is the first layer-face to clear,
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and <parameter>depth</parameter> is the number of layer-faces to clear. Each layer-face is
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translated into an array layer and a cube map face as described in the OpenGL Specification.
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</para>
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<para>
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Negative values of <parameter>xoffset</parameter>, <parameter>yoffset</parameter>, and <parameter>zoffset</parameter> correspond to the coordinates of
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border texels. Taking
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">ws</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">hs</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">ds</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">wb</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">hb</mml:mi></mml:math>
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</inlineequation>, and
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">db</mml:mi></mml:math>
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</inlineequation> to be
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the specified <parameter>width</parameter>, <parameter>height</parameter>, <parameter>depth</parameter>, and the border width, border height, and border
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depth of the texel array and taking
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math>
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</inlineequation>,
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math>
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</inlineequation>, and
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<inlineequation>
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<mml:math><mml:mi mathvariant="italic">d</mml:mi></mml:math>
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</inlineequation>
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to be the <parameter>xoffset</parameter>, <parameter>yoffset</parameter>,
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<parameter>zoffset</parameter>, <parameter>width</parameter>, <parameter>height</parameter>, and <parameter>depth</parameter> argument values,
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any of the following relationships generates a <constant>GL_INVALID_OPERATION</constant> error:
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<itemizedlist>
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<listitem>
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<informalequation>
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<mml:math>
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<mml:mrow>
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<mml:mtext>x</mml:mtext>
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<mml:mo><</mml:mo>
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<mml:msub>
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<mml:mtext>w</mml:mtext>
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<mml:mtext>b</mml:mtext>
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</mml:msub>
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</mml:mrow>
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</mml:math>
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</informalequation>
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</listitem>
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<listitem>
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<informalequation>
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<mml:math>
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<mml:mrow>
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<mml:mtext mathvariant="italic">x</mml:mtext>
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<mml:mo>+</mml:mo>
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<mml:mtext mathvariant="italic">w</mml:mtext>
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<mml:mo>></mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">w</mml:mtext>
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<mml:mtext mathvariant="italic">s</mml:mtext>
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</mml:msub>
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<mml:mo>-</mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">w</mml:mtext>
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<mml:mtext mathvariant="italic">b</mml:mtext>
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</mml:msub>
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</mml:mrow>
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</mml:math>
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</informalequation>
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</listitem>
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<listitem>
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<informalequation>
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<mml:math>
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<mml:mrow>
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<mml:mtext mathvariant="italic">y</mml:mtext>
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<mml:mo><</mml:mo>
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<mml:mo>-</mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">h</mml:mtext>
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<mml:mtext mathvariant="italic">b</mml:mtext>
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</mml:msub>
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</mml:mrow>
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</mml:math>
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</informalequation>
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</listitem>
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<listitem>
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<informalequation>
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<mml:math>
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<mml:mrow>
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<mml:mtext mathvariant="italic">y</mml:mtext>
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<mml:mo>+</mml:mo>
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<mml:mtext mathvariant="italic">h</mml:mtext>
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<mml:mo>></mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">h</mml:mtext>
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<mml:mtext mathvariant="italic">s</mml:mtext>
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</mml:msub>
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<mml:mo>-</mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">h</mml:mtext>
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<mml:mtext mathvariant="italic">b</mml:mtext>
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</mml:msub>
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</mml:mrow>
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</mml:math>
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</informalequation>
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</listitem>
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<listitem>
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<informalequation>
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<mml:math>
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<mml:mrow>
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<mml:mtext mathvariant="italic">z</mml:mtext>
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<mml:mo><</mml:mo>
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<mml:mo>-</mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">d</mml:mtext>
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<mml:mtext mathvariant="italic">b</mml:mtext>
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</mml:msub>
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</mml:mrow>
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</mml:math>
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</informalequation>
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</listitem>
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<listitem>
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<informalequation>
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<mml:math>
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<mml:mrow>
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<mml:mtext mathvariant="italic">z</mml:mtext>
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<mml:mo>+</mml:mo>
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<mml:mtext mathvariant="italic">d</mml:mtext>
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<mml:mo>></mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">d</mml:mtext>
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<mml:mtext mathvariant="italic">s</mml:mtext>
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</mml:msub>
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<mml:mo>-</mml:mo>
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<mml:msub>
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<mml:mtext mathvariant="italic">d</mml:mtext>
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<mml:mtext mathvariant="italic">b</mml:mtext>
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</mml:msub>
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</mml:mrow>
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</mml:math>
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</informalequation>
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</listitem>
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</itemizedlist>
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</para>
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<para>
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For texture types that do not have certain dimensions, this command treats those
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dimensions as having a size of 1. For example, to clear a portion of a two-dimensional
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texture, use <parameter>zoffset</parameter> equal to zero and <parameter>depth</parameter> equal to one.
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</para>
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<para>
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<parameter>format</parameter> and <parameter>type</parameter> specify the format and type of the
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source data and are interpreted as they are for <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>.
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Textures with a base internal format of <constant>GL_DEPTH_COMPONENT</constant>, <constant>GL_STENCIL_INDEX</constant>, or <constant>GL_DEPTH_STENCIL</constant>
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require depth component, stencil, or depth-stencil component data respectively.
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Textures with other base internal formats require RGBA formats. Textures with integer
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internal formats require integer data.
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</para>
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<para>
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<parameter>data</parameter> is a pointer to an array of between one and four components of texel
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data that will be used as the source for the constant fill value. The elements of
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data are converted by the GL into the internal format of the texture image (that
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was specified when the level was defined by any of the <function>glTexImage*</function>, <function>glTexStorage*</function>
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or <function>glCopyTexImage*</function> commands), and then
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used to fill the specified range of the destination texture level. If <parameter>data</parameter> is <constant>NULL</constant>, then
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the pointer is ignored and the sub-range of the texture image is filled with zeros. If
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texture is a multisample texture, all the samples in a texel are cleared to the value
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specified by data.
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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>glClearTexSubImage</function> is available only if the GL version is 4.4 or greater.
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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_OPERATION</constant> is generated if <parameter>texture</parameter> is zero or not the
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name of an existing texture object.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>texture</parameter> is a buffer texture.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>texture</parameter> has a compressed
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internal format.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the base internal format is
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<constant>GL_DEPTH_COMPONENT</constant> and <parameter>format</parameter> is not <constant>GL_DEPTH_COMPONENT</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the base internal format is
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<constant>GL_DEPTH_STENCIL</constant> and <parameter>format</parameter> is not <constant>GL_DEPTH_STENCIL</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the base internal format is
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<constant>GL_STENCIL_INDEX</constant> and <parameter>format</parameter> is not <constant>GL_STENCIL_INDEX</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the base internal format is
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<constant>GL_RGBA</constant> and <parameter>format</parameter> is <constant>GL_DEPTH_COMPONENT</constant>, <constant>GL_STENCIL_INDEX</constant>, or <constant>GL_DEPTH_STENCIL</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the internal format is integer and <parameter>format</parameter> does not specify integer data.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the internal format is not
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integer and <parameter>format</parameter> specifies integer data.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> error is generated if the <parameter>xoffset</parameter>, <parameter>yoffset</parameter>, <parameter>zoffset</parameter>,
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<parameter>width</parameter>, <parameter>height</parameter>, and <parameter>depth</parameter> parameters (or combinations thereof) specify a region that falls outside the
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defined texture image array (including border, if any).
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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>, <citerefentry><refentrytitle>glGetInternalformat</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>glClearTexImage</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>
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</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> 2013 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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