mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-26 17:25:37 +00:00
272 lines
12 KiB
XML
272 lines
12 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="glGetHistogram">
|
|
<refmeta>
|
|
<refmetainfo>
|
|
<copyright>
|
|
<year>1991-2006</year>
|
|
<holder>Silicon Graphics, Inc.</holder>
|
|
</copyright>
|
|
</refmetainfo>
|
|
<refentrytitle>glGetHistogram</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glGetHistogram</refname>
|
|
<refpurpose>get histogram table</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glGetHistogram</function></funcdef>
|
|
<paramdef>GLenum <parameter>target</parameter></paramdef>
|
|
<paramdef>GLboolean <parameter>reset</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>format</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>type</parameter></paramdef>
|
|
<paramdef>GLvoid * <parameter>values</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>target</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Must be
|
|
<constant>GL_HISTOGRAM</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>reset</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
If <constant>GL_TRUE</constant>, each component counter that is actually returned
|
|
is reset to zero. (Other counters are unaffected.)
|
|
If <constant>GL_FALSE</constant>, none of the counters in the histogram table is modified.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>format</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
The format of values to be returned in <parameter>values</parameter>.
|
|
Must be one of
|
|
<constant>GL_RED</constant>,
|
|
<constant>GL_GREEN</constant>,
|
|
<constant>GL_BLUE</constant>,
|
|
<constant>GL_ALPHA</constant>,
|
|
<constant>GL_RGB</constant>,
|
|
<constant>GL_BGR</constant>,
|
|
<constant>GL_RGBA</constant>,
|
|
<constant>GL_BGRA</constant>,
|
|
<constant>GL_LUMINANCE</constant>, or
|
|
<constant>GL_LUMINANCE_ALPHA</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>type</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
The type of values to be returned in <parameter>values</parameter>.
|
|
Symbolic constants
|
|
<constant>GL_UNSIGNED_BYTE</constant>,
|
|
<constant>GL_BYTE</constant>,
|
|
<constant>GL_BITMAP</constant>,
|
|
<constant>GL_UNSIGNED_SHORT</constant>,
|
|
<constant>GL_SHORT</constant>,
|
|
<constant>GL_UNSIGNED_INT</constant>,
|
|
<constant>GL_INT</constant>,
|
|
<constant>GL_FLOAT</constant>,
|
|
<constant>GL_UNSIGNED_BYTE_3_3_2</constant>,
|
|
<constant>GL_UNSIGNED_BYTE_2_3_3_REV</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_5_6_5</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_5_6_5_REV</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_4_4_4_4</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_4_4_4_4_REV</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_5_5_5_1</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_1_5_5_5_REV</constant>,
|
|
<constant>GL_UNSIGNED_INT_8_8_8_8</constant>,
|
|
<constant>GL_UNSIGNED_INT_8_8_8_8_REV</constant>,
|
|
<constant>GL_UNSIGNED_INT_10_10_10_2</constant>, and
|
|
<constant>GL_UNSIGNED_INT_2_10_10_10_REV</constant>
|
|
are accepted.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>values</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
A pointer to storage for the returned histogram table.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glGetHistogram</function> returns the current histogram table as a one-dimensional image
|
|
with the same width as the histogram.
|
|
No pixel transfer operations are performed on this image, but pixel storage
|
|
modes that are applicable to 1D images are honored.
|
|
</para>
|
|
<para>
|
|
If a non-zero named buffer object is bound to the <constant>GL_PIXEL_PACK_BUFFER</constant> target
|
|
(see <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>) while a histogram table is
|
|
requested, <parameter>values</parameter> is treated as a byte offset into the buffer object's data store.
|
|
</para>
|
|
<para>
|
|
Color components that are requested in the specified <parameter>format</parameter>, but which
|
|
are not included in the internal format of the histogram, are returned as
|
|
zero.
|
|
The assignments of internal color components to the components
|
|
requested by <parameter>format</parameter> are:
|
|
</para>
|
|
<informaltable frame="topbot">
|
|
<tgroup cols="2" align="left">
|
|
<colspec/>
|
|
<colspec/>
|
|
<thead>
|
|
<row>
|
|
<entry rowsep="1" align="left"><emphasis role="bold">
|
|
Internal Component
|
|
</emphasis></entry>
|
|
<entry rowsep="1" align="left"><emphasis role="bold">
|
|
Resulting Component
|
|
</emphasis></entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<row>
|
|
<entry align="left">
|
|
Red
|
|
</entry>
|
|
<entry align="left">
|
|
Red
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
Green
|
|
</entry>
|
|
<entry align="left">
|
|
Green
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
Blue
|
|
</entry>
|
|
<entry align="left">
|
|
Blue
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
Alpha
|
|
</entry>
|
|
<entry align="left">
|
|
Alpha
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
Luminance
|
|
</entry>
|
|
<entry align="left">
|
|
Red
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
<para>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
<function>glGetHistogram</function> is present only if <code>ARB_imaging</code> is returned when <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>
|
|
is called with an argument of <constant>GL_EXTENSIONS</constant>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not <constant>GL_HISTOGRAM</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>format</parameter> is not one of the allowable
|
|
values.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>type</parameter> is not one of the allowable
|
|
values.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>type</parameter> is one of
|
|
<constant>GL_UNSIGNED_BYTE_3_3_2</constant>,
|
|
<constant>GL_UNSIGNED_BYTE_2_3_3_REV</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_5_6_5</constant>, or
|
|
<constant>GL_UNSIGNED_SHORT_5_6_5_REV</constant>
|
|
and <parameter>format</parameter> is not <constant>GL_RGB</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>type</parameter> is one of
|
|
<constant>GL_UNSIGNED_SHORT_4_4_4_4</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_4_4_4_4_REV</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_5_5_5_1</constant>,
|
|
<constant>GL_UNSIGNED_SHORT_1_5_5_5_REV</constant>,
|
|
<constant>GL_UNSIGNED_INT_8_8_8_8</constant>,
|
|
<constant>GL_UNSIGNED_INT_8_8_8_8_REV</constant>,
|
|
<constant>GL_UNSIGNED_INT_10_10_10_2</constant>, or
|
|
<constant>GL_UNSIGNED_INT_2_10_10_10_REV</constant>
|
|
and <parameter>format</parameter> is neither <constant>GL_RGBA</constant> nor <constant>GL_BGRA</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
|
|
<constant>GL_PIXEL_PACK_BUFFER</constant> target and the buffer object's data store is currently mapped.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
|
|
<constant>GL_PIXEL_PACK_BUFFER</constant> target and the data would be packed to the buffer
|
|
object such that the memory writes required would exceed the data store size.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
|
|
<constant>GL_PIXEL_PACK_BUFFER</constant> target and <parameter>values</parameter> is not evenly divisible
|
|
into the number of bytes needed to store in memory a datum indicated by <parameter>type</parameter>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetHistogram</function> is executed
|
|
between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding
|
|
execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGetHistogramParameter</refentrytitle></citerefentry>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_PACK_BUFFER_BINDING</constant>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glHistogram</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glResetHistogram</refentrytitle></citerefentry>,
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 1991-2006
|
|
Silicon Graphics, Inc. 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>
|