mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-25 07:55:39 +00:00
353 lines
18 KiB
XML
353 lines
18 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
|
|
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
|
|
<refentry id="glGetTexLevelParameter">
|
|
<refentryinfo>
|
|
<copyright>
|
|
<year>2013</year>
|
|
<holder>Khronos Group</holder>
|
|
</copyright>
|
|
</refentryinfo>
|
|
<refmeta>
|
|
<refentrytitle>glGetTexLevelParameter</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glGetTexLevelParameter</refname>
|
|
<refpurpose>return texture parameter values for a specific level of detail</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glGetTexLevelParameterfv</function></funcdef>
|
|
<paramdef>GLenum <parameter>target</parameter></paramdef>
|
|
<paramdef>GLint <parameter>level</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>pname</parameter></paramdef>
|
|
<paramdef>GLfloat * <parameter>params</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glGetTexLevelParameteriv</function></funcdef>
|
|
<paramdef>GLenum <parameter>target</parameter></paramdef>
|
|
<paramdef>GLint <parameter>level</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>pname</parameter></paramdef>
|
|
<paramdef>GLint * <parameter>params</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>target</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the symbolic name of the target texture,
|
|
one of
|
|
<constant>GL_TEXTURE_1D</constant>,
|
|
<constant>GL_TEXTURE_2D</constant>,
|
|
<constant>GL_TEXTURE_3D</constant>,
|
|
<constant>GL_TEXTURE_1D_ARRAY</constant>,
|
|
<constant>GL_TEXTURE_2D_ARRAY</constant>,
|
|
<constant>GL_TEXTURE_RECTANGLE</constant>,
|
|
<constant>GL_TEXTURE_2D_MULTISAMPLE</constant>,
|
|
<constant>GL_TEXTURE_2D_MULTISAMPLE_ARRAY</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_X</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_X</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_Y</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_Z</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</constant>,
|
|
<constant>GL_PROXY_TEXTURE_1D</constant>,
|
|
<constant>GL_PROXY_TEXTURE_2D</constant>,
|
|
<constant>GL_PROXY_TEXTURE_3D</constant>,
|
|
<constant>GL_PROXY_TEXTURE_1D_ARRAY</constant>,
|
|
<constant>GL_PROXY_TEXTURE_2D_ARRAY</constant>,
|
|
<constant>GL_PROXY_TEXTURE_RECTANGLE</constant>,
|
|
<constant>GL_PROXY_TEXTURE_2D_MULTISAMPLE</constant>,
|
|
<constant>GL_PROXY_TEXTURE_2D_MULTISAMPLE_ARRAY</constant>,
|
|
<constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>, or
|
|
<constant>GL_TEXTURE_BUFFER</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>level</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the level-of-detail number of the desired image.
|
|
Level 0 is the base image level.
|
|
Level
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>
|
|
is the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>th
|
|
mipmap reduction image.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>pname</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the symbolic name of a texture parameter.
|
|
<constant>GL_TEXTURE_WIDTH</constant>,
|
|
<constant>GL_TEXTURE_HEIGHT</constant>,
|
|
<constant>GL_TEXTURE_DEPTH</constant>,
|
|
<constant>GL_TEXTURE_INTERNAL_FORMAT</constant>,
|
|
<constant>GL_TEXTURE_RED_SIZE</constant>,
|
|
<constant>GL_TEXTURE_GREEN_SIZE</constant>,
|
|
<constant>GL_TEXTURE_BLUE_SIZE</constant>,
|
|
<constant>GL_TEXTURE_ALPHA_SIZE</constant>,
|
|
<constant>GL_TEXTURE_DEPTH_SIZE</constant>,
|
|
<constant>GL_TEXTURE_COMPRESSED</constant>,
|
|
<constant>GL_TEXTURE_COMPRESSED_IMAGE_SIZE</constant>, and
|
|
<constant>GL_TEXTURE_BUFFER_OFFSET</constant>
|
|
are accepted.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>params</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Returns the requested data.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glGetTexLevelParameter</function> returns in <parameter>params</parameter> texture parameter values for a specific
|
|
level-of-detail value,
|
|
specified as <parameter>level</parameter>.
|
|
<parameter>target</parameter> defines the target texture,
|
|
either <constant>GL_TEXTURE_1D</constant>, <constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_3D</constant>,
|
|
<constant>GL_PROXY_TEXTURE_1D</constant>,
|
|
<constant>GL_PROXY_TEXTURE_2D</constant>,
|
|
<constant>GL_PROXY_TEXTURE_3D</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_X</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_X</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_Y</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_POSITIVE_Z</constant>,
|
|
<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</constant>, or
|
|
<constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_TEXTURE_SIZE</constant>, and <constant>GL_MAX_3D_TEXTURE_SIZE</constant> are not really
|
|
descriptive enough.
|
|
It has to report the largest square texture image that can be
|
|
accommodated with mipmaps
|
|
but a long skinny texture, or a texture without mipmaps may
|
|
easily fit in texture memory.
|
|
The proxy targets allow the user to more accurately query
|
|
whether the GL can accommodate a texture of a given configuration.
|
|
If the texture cannot be accommodated, the texture state variables, which
|
|
may be queried with <function>glGetTexLevelParameter</function>, are set to 0. If the texture can be accommodated,
|
|
the texture state values will be set as they would be set for a
|
|
non-proxy target.
|
|
</para>
|
|
<para>
|
|
<parameter>pname</parameter> specifies the texture parameter whose value or values
|
|
will be returned.
|
|
</para>
|
|
<para>
|
|
The accepted parameter names are as follows:
|
|
</para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_WIDTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value,
|
|
the width of the texture image.
|
|
The initial value is 0.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_HEIGHT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value,
|
|
the height of the texture image.
|
|
The initial value is 0.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_DEPTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value,
|
|
the depth of the texture image.
|
|
The initial value is 0.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_INTERNAL_FORMAT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value,
|
|
the internal format of the texture image.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_RED_TYPE</constant>,
|
|
<constant>GL_TEXTURE_GREEN_TYPE</constant>,
|
|
<constant>GL_TEXTURE_BLUE_TYPE</constant>,
|
|
<constant>GL_TEXTURE_ALPHA_TYPE</constant>,
|
|
<constant>GL_TEXTURE_DEPTH_TYPE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
The data type used to store the component.
|
|
The types <constant>GL_NONE</constant>, <constant>GL_SIGNED_NORMALIZED</constant>,
|
|
<constant>GL_UNSIGNED_NORMALIZED</constant>, <constant>GL_FLOAT</constant>,
|
|
<constant>GL_INT</constant>, and <constant>GL_UNSIGNED_INT</constant> may be returned
|
|
to indicate signed normalized fixed-point, unsigned normalized fixed-point, floating-point, integer unnormalized, and
|
|
unsigned integer unnormalized components, respectively.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_RED_SIZE</constant>,
|
|
<constant>GL_TEXTURE_GREEN_SIZE</constant>,
|
|
<constant>GL_TEXTURE_BLUE_SIZE</constant>,
|
|
<constant>GL_TEXTURE_ALPHA_SIZE</constant>,
|
|
<constant>GL_TEXTURE_DEPTH_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
The internal storage resolution of an individual component.
|
|
The resolution chosen by the GL will be a close match for the resolution
|
|
requested by the user with the component argument of <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>, and
|
|
<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>. The initial value is 0.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_COMPRESSED</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating if the texture image is
|
|
stored in a compressed internal format. The initiali value is <constant>GL_FALSE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_COMPRESSED_IMAGE_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>params</parameter> returns a single integer value, the number of unsigned bytes of the
|
|
compressed texture image that would be returned from
|
|
<citerefentry><refentrytitle>glGetCompressedTexImage</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BUFFER_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>params</parameter> returns a single integer value, the offset into the
|
|
data store of the buffer bound to a buffer texture.
|
|
<citerefentry><refentrytitle>glTexBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>params</parameter> returns a single integer value, the size of the range of a
|
|
data store of the buffer bound to a buffer texture.
|
|
<citerefentry><refentrytitle>glTexBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
If an error is generated,
|
|
no change is made to the contents of <parameter>params</parameter>.
|
|
</para>
|
|
<para>
|
|
<function>glGetTexLevelParameter</function> returns the texture level parameters for the active texture unit.
|
|
</para>
|
|
<para>
|
|
<constant>GL_TEXTURE_BUFFER_OFFSET</constant> and <constant>GL_TEXTURE_BUFFER_SIZE</constant> are available only
|
|
if the GL version is 4.3 or greater.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> or <parameter>pname</parameter> is not an
|
|
accepted value.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>level</parameter> is less than 0.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> may be generated if <parameter>level</parameter> is greater
|
|
than
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: log sub 2: -->
|
|
<mml:msub><mml:mi mathvariant="italic">log</mml:mi>
|
|
<mml:mn>2</mml:mn>
|
|
</mml:msub>
|
|
</mml:math></inlineequation>
|
|
<emphasis>max</emphasis>,
|
|
where <emphasis>max</emphasis> is the returned value of <constant>GL_MAX_TEXTURE_SIZE</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>target</parameter> is <constant>GL_TEXTURE_BUFFER</constant>
|
|
and <parameter>level</parameter> is not zero.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if
|
|
<constant>GL_TEXTURE_COMPRESSED_IMAGE_SIZE</constant> is queried on texture images with an
|
|
uncompressed internal format or on proxy targets.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 1991-2006
|
|
Silicon Graphics, Inc. Copyright <trademark class="copyright"></trademark> 2010-2013
|
|
Khronos Group. This document is licensed under the SGI
|
|
Free Software B License. For details, see
|
|
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|