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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="glBindImageTexture">
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<info>
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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>glBindImageTexture</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glBindImageTexture</refname>
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<refpurpose>bind a level of a texture to an image unit</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>glBindImageTexture</function></funcdef>
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<paramdef>GLuint <parameter>unit</parameter></paramdef>
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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>GLboolean <parameter>layered</parameter></paramdef>
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<paramdef>GLint <parameter>layer</parameter></paramdef>
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<paramdef>GLenum <parameter>access</parameter></paramdef>
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<paramdef>GLenum <parameter>format</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>unit</parameter></term>
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<listitem>
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<para>
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Specifies the index of the image unit to which to bind the texture
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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>texture</parameter></term>
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<listitem>
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<para>
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Specifies the name of the texture to bind to the image unit.
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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 the texture that is to be bound.
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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>layered</parameter></term>
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<listitem>
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<para>
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Specifies whether a layered texture binding is to be established.
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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>layer</parameter></term>
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<listitem>
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<para>
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If <parameter>layered</parameter> is <constant>GL_FALSE</constant>, specifies the layer of <parameter>texture</parameter> to be bound to the image unit. Ignored otherwise.
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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>access</parameter></term>
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<listitem>
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<para>
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Specifies a token indicating the type of access that will be performed on the 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>format</parameter></term>
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<listitem>
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<para>
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Specifies the format that the elements of the image will be treated as for the purposes of formatted loads and stores.
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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>glBindImageTexture</function> binds a single level of a texture to an image unit for the purpose of
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reading and writing it from shaders. <parameter>unit</parameter> specifies the zero-based index of the image
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unit to which to bind the texture level. <parameter>texture</parameter> specifies the name of an existing texture
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object to bind to the image unit. If <parameter>texture</parameter> is zero, then any existing binding to
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the image unit is broken. <parameter>level</parameter> specifies the level of the texture to bind to the image
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unit.
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</para>
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<para>
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If <parameter>texture</parameter> is the name of a two-dimensional array texture, a cube map
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texture, or a two-dimensional multisample array texture, then it is possible to bind either
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the entire array, or only a single layer of the array to the image unit. In such cases, if <parameter>layered</parameter>
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is <constant>GL_TRUE</constant>, the entire array is attached to the image unit and <parameter>layer</parameter>
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is ignored. However, if <parameter>layered</parameter> is <constant>GL_FALSE</constant> then <parameter>layer</parameter>
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specifies the layer of the array to attach to the image unit.
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</para>
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<para>
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<parameter>access</parameter> specifies the access types to be performed by shaders and may be set to
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<constant>GL_READ_ONLY</constant>, <constant>GL_WRITE_ONLY</constant>, or <constant>GL_READ_WRITE</constant>
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to indicate read-only, write-only or read-write access, respectively. Violation of the access type specified in <parameter>access</parameter>
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(for example, if a shader writes to an image bound with <parameter>access</parameter> set to <constant>GL_READ_ONLY</constant>)
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will lead to undefined results, possibly including program termination.
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</para>
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<para>
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<parameter>format</parameter> specifies the format that is to be used when performing formatted loads and stores into the
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image from shaders. <parameter>format</parameter> must be compatible with the texture's internal format and must
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be one of the formats listed in the following table.
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</para>
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<para>
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<table frame="topbot"><title>Internal Image Formats</title>
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<tgroup cols="2" align="left">
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<colspec align="left"/>
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<colspec align="left"/>
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<thead>
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<row>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Image Unit Format
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</emphasis></entry>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Format Qualifier
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</emphasis></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><constant>GL_RGBA32F</constant></entry><entry><code>rgba32f</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA16F</constant></entry><entry><code>rgba16f</code></entry>
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</row>
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<row>
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<entry><constant>GL_R32F</constant></entry><entry><code>r32f</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA32UI</constant></entry><entry><code>rgba32ui</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA16UI</constant></entry><entry><code>rgba16ui</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA8UI</constant></entry><entry><code>rgba8ui</code></entry>
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</row>
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<row>
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<entry><constant>GL_R32UI</constant></entry><entry><code>r32ui</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA32I</constant></entry><entry><code>rgba32i</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA16I</constant></entry><entry><code>rgba16i</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA8I</constant></entry><entry><code>rgba8i</code></entry>
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</row>
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<row>
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<entry><constant>GL_R32I</constant></entry><entry><code>r32i</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA8</constant></entry><entry><code>rgba8</code></entry>
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</row>
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<row>
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<entry><constant>GL_RGBA8_SNORM</constant></entry><entry><code>rgba8_snorm</code></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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<para>
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When a texture is bound to an image unit, the <parameter>format</parameter> parameter for the image
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unit need not exactly match the texture internal format as long as the formats are
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considered compatible as defined in the OpenGL ES Specification. The matching criterion used
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for a given texture may be determined by calling <citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>
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with <parameter>value</parameter>
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set to <constant>GL_IMAGE_FORMAT_COMPATIBILITY_TYPE</constant>, with return values of <constant>GL_IMAGE_FORMAT_COMPATIBILITY_BY_SIZE</constant>
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and <constant>GL_IMAGE_FORMAT_COMPATIBILITY_BY_CLASS</constant>, specifying matches by size and class, respectively.
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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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The <function>glBindImageTexture</function> can only be used with immutable textures. This is intended to guide developers towards
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immutable textures.
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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_VALUE</constant> is generated if <parameter>unit</parameter> greater than or equal to the
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value of <constant>GL_MAX_IMAGE_UNITS</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>texture</parameter> is not the name of
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an existing texture object.
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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> or <parameter>layer</parameter>
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is less than zero.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>access</parameter> or <parameter>format</parameter>
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is not one of the supported tokens.
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</para>
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</refsect1>
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<refsect1 xml:id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_IMAGE_BINDING_NAME</constant>.
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_IMAGE_BINDING_LEVEL</constant>.
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_IMAGE_BINDING_LAYERED</constant>.
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_IMAGE_BINDING_LAYER</constant>.
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_IMAGE_BINDING_ACCESS</constant>.
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_IMAGE_BINDING_FORMAT</constant>.
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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><function>glBindImageTexture</function></entry>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es31']/*)"/>
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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>glGenTextures</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>glBindTexture</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"/> 2011-2014 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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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
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</para>
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</refsect1>
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</refentry>
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