mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-27 09:35:43 +00:00
1189 lines
57 KiB
XML
1189 lines
57 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="glReadPixels">
|
|
<refmeta>
|
|
<refmetainfo>
|
|
<copyright>
|
|
<year>1991-2006</year>
|
|
<holder>Silicon Graphics, Inc.</holder>
|
|
</copyright>
|
|
</refmetainfo>
|
|
<refentrytitle>glReadPixels</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glReadPixels</refname>
|
|
<refpurpose>read a block of pixels from the frame buffer</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glReadPixels</function></funcdef>
|
|
<paramdef>GLint <parameter>x</parameter></paramdef>
|
|
<paramdef>GLint <parameter>y</parameter></paramdef>
|
|
<paramdef>GLsizei <parameter>width</parameter></paramdef>
|
|
<paramdef>GLsizei <parameter>height</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>format</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>type</parameter></paramdef>
|
|
<paramdef>GLvoid * <parameter>data</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<!-- eqn: ignoring delim $$ -->
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>x</parameter></term>
|
|
<term><parameter>y</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specify the window coordinates of the first pixel
|
|
that is read from the frame buffer.
|
|
This location is the lower left corner of a rectangular block of pixels.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>width</parameter></term>
|
|
<term><parameter>height</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specify the dimensions of the pixel rectangle.
|
|
<parameter>width</parameter> and <parameter>height</parameter> of one correspond to a single pixel.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>format</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the format of the pixel data.
|
|
The following symbolic values are accepted:
|
|
<constant>GL_STENCIL_INDEX</constant>,
|
|
<constant>GL_DEPTH_COMPONENT</constant>,
|
|
<constant>GL_DEPTH_STENCIL</constant>,
|
|
<constant>GL_RED</constant>,
|
|
<constant>GL_GREEN</constant>,
|
|
<constant>GL_BLUE</constant>,
|
|
<constant>GL_RGB</constant>,
|
|
<constant>GL_BGR</constant>,
|
|
<constant>GL_RGBA</constant>, and
|
|
<constant>GL_BGRA</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>type</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the data type of the pixel data.
|
|
Must be one of
|
|
<constant>GL_UNSIGNED_BYTE</constant>,
|
|
<constant>GL_BYTE</constant>,
|
|
<constant>GL_UNSIGNED_SHORT</constant>,
|
|
<constant>GL_SHORT</constant>,
|
|
<constant>GL_UNSIGNED_INT</constant>,
|
|
<constant>GL_INT</constant>,
|
|
<constant>GL_HALF_FLOAT</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>,
|
|
<constant>GL_UNSIGNED_INT_2_10_10_10_REV</constant>,
|
|
<constant>GL_UNSIGNED_INT_24_8</constant>,
|
|
<constant>GL_UNSIGNED_INT_10F_11F_11F_REV</constant>,
|
|
<constant>GL_UNSIGNED_INT_5_9_9_9_REV</constant>, or
|
|
<constant>GL_FLOAT_32_UNSIGNED_INT_24_8_REV</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>data</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Returns the pixel data.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glReadPixels</function> returns pixel data from the frame buffer,
|
|
starting with the pixel whose lower left corner
|
|
is at location (<parameter>x</parameter>, <parameter>y</parameter>),
|
|
into client memory starting at location <parameter>data</parameter>.
|
|
Several parameters control the processing of the pixel data before
|
|
it is placed into client memory.
|
|
These parameters are set with <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
This reference page describes the effects on <function>glReadPixels</function> of most,
|
|
but not all of the parameters specified by these three commands.
|
|
</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 block of pixels is
|
|
requested, <parameter>data</parameter> is treated as a byte offset into the buffer object's data store
|
|
rather than a pointer to client memory.
|
|
</para>
|
|
<para>
|
|
<function>glReadPixels</function> returns values from each pixel with lower left corner at
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (x + i, y + j): -->
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">x</mml:mi>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">i</mml:mi>
|
|
</mml:mrow>
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">y</mml:mi>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">j</mml:mi>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
</mml:math></inlineequation>
|
|
for
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 0 <= i < width: -->
|
|
<mml:mrow>
|
|
<mml:mn>0</mml:mn>
|
|
<mml:mo><=</mml:mo>
|
|
<mml:mi mathvariant="italic">i</mml:mi>
|
|
<mml:mo><</mml:mo>
|
|
<mml:mi mathvariant="italic">width</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 0 <= j < height: -->
|
|
<mml:mrow>
|
|
<mml:mn>0</mml:mn>
|
|
<mml:mo><=</mml:mo>
|
|
<mml:mi mathvariant="italic">j</mml:mi>
|
|
<mml:mo><</mml:mo>
|
|
<mml:mi mathvariant="italic">height</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>.
|
|
This pixel is said to be the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>th
|
|
pixel in the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">j</mml:mi></mml:math></inlineequation>th
|
|
row.
|
|
Pixels are returned in row order from the lowest to the highest row,
|
|
left to right in each row.
|
|
</para>
|
|
<para>
|
|
<parameter>format</parameter> specifies the format for the returned pixel values;
|
|
accepted values are:
|
|
</para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_INDEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Stencil values are read from the stencil buffer.
|
|
Each index is converted to fixed point,
|
|
shifted left or right depending on the value and sign of <constant>GL_INDEX_SHIFT</constant>,
|
|
and added to <constant>GL_INDEX_OFFSET</constant>.
|
|
If <constant>GL_MAP_STENCIL</constant> is <constant>GL_TRUE</constant>,
|
|
indices are replaced by their mappings in the table <constant>GL_PIXEL_MAP_S_TO_S</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_COMPONENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Depth values are read from the depth buffer.
|
|
Each component is converted to floating point such that the minimum depth
|
|
value maps to 0 and the maximum value maps to 1.
|
|
Each component is then multiplied by <constant>GL_DEPTH_SCALE</constant>,
|
|
added to <constant>GL_DEPTH_BIAS</constant>,
|
|
and finally clamped to the range
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: [0,1]: -->
|
|
<mml:mfenced open="[" close="]">
|
|
<mml:mn>0</mml:mn>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mfenced>
|
|
</mml:math></inlineequation>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_STENCIL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Values are taken from both the depth and stencil buffers. The <parameter>type</parameter> parameter
|
|
must be <constant>GL_UNSIGNED_INT_24_8</constant> or <constant>GL_FLOAT_32_UNSIGNED_INT_24_8_REV</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_RED</constant></term>
|
|
<listitem>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_GREEN</constant></term>
|
|
<listitem>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_BLUE</constant></term>
|
|
<listitem>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_RGB</constant></term>
|
|
<listitem>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_BGR</constant></term>
|
|
<listitem>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_RGBA</constant></term>
|
|
<listitem>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_BGRA</constant></term>
|
|
<listitem>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
<para>
|
|
Finally, the indices or components
|
|
are converted to the proper format,
|
|
as specified by <parameter>type</parameter>.
|
|
If <parameter>format</parameter> is <constant>GL_STENCIL_INDEX</constant>
|
|
and <parameter>type</parameter> is not <constant>GL_FLOAT</constant>,
|
|
each index is masked with the mask value given in the following table.
|
|
If <parameter>type</parameter> is <constant>GL_FLOAT</constant>, then each integer index is converted to
|
|
single-precision floating-point format.
|
|
</para>
|
|
<para>
|
|
If <parameter>format</parameter> is
|
|
<constant>GL_RED</constant>,
|
|
<constant>GL_GREEN</constant>,
|
|
<constant>GL_BLUE</constant>,
|
|
<constant>GL_RGB</constant>,
|
|
<constant>GL_BGR</constant>,
|
|
<constant>GL_RGBA</constant>, or
|
|
<constant>GL_BGRA</constant> and <parameter>type</parameter> is not <constant>GL_FLOAT</constant>,
|
|
each component is multiplied by the multiplier shown in the following table.
|
|
If type is <constant>GL_FLOAT</constant>, then each component is passed as is
|
|
(or converted to the client's single-precision floating-point format if
|
|
it is different from the one used by the GL).
|
|
</para>
|
|
<para>
|
|
</para>
|
|
<informaltable frame="topbot">
|
|
<tgroup cols="3" align="left">
|
|
<colspec/>
|
|
<colspec align="center"/>
|
|
<colspec align="center"/>
|
|
<thead>
|
|
<row>
|
|
<entry rowsep="1" align="left">
|
|
<parameter>type</parameter>
|
|
</entry>
|
|
<entry rowsep="1" align="center"><emphasis role="bold">
|
|
Index Mask
|
|
</emphasis></entry>
|
|
<entry rowsep="1" align="center"><emphasis role="bold">
|
|
Component Conversion
|
|
</emphasis></entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_BYTE</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup 8 - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>8</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup 8 - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>8</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_BYTE</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup 7 - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>7</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: {(2 sup 8 - 1) c - 1} / 2: -->
|
|
<mml:mfrac>
|
|
<mml:mfenced open="" close="">
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>8</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mn>2</mml:mn>
|
|
</mml:mfrac>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_SHORT</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup 16 - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>16</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup 16 - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>16</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_SHORT</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup 15 - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>15</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: {(2 sup 16 - 1) c - 1} / 2: -->
|
|
<mml:mfrac>
|
|
<mml:mfenced open="" close="">
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>16</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mn>2</mml:mn>
|
|
</mml:mfrac>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup 32 - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>32</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup 32 - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>32</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_INT</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup 31 - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>31</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: {(2 sup 32 - 1) c - 1} / 2: -->
|
|
<mml:mfrac>
|
|
<mml:mfenced open="" close="">
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>32</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mn>2</mml:mn>
|
|
</mml:mfrac>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_HALF_FLOAT</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
none
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">c</mml:mi></mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
none
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">c</mml:mi></mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_BYTE_3_3_2</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_BYTE_2_3_3_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_SHORT_5_6_5</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_SHORT_5_6_5_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_SHORT_4_4_4_4</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_SHORT_4_4_4_4_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_SHORT_5_5_5_1</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_SHORT_1_5_5_5_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_8_8_8_8</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_8_8_8_8_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_10_10_10_2</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_2_10_10_10_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_24_8</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 2 sup N - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (2 sup N - 1) c: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msup><mml:mn>2</mml:mn>
|
|
<mml:mn>N</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">c</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_10F_11F_11F_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
--
|
|
</entry>
|
|
<entry align="left">
|
|
Special
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_UNSIGNED_INT_5_9_9_9_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
--
|
|
</entry>
|
|
<entry align="left">
|
|
Special
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry align="left">
|
|
<constant>GL_FLOAT_32_UNSIGNED_INT_24_8_REV</constant>
|
|
</entry>
|
|
<entry align="center">
|
|
none
|
|
</entry>
|
|
<entry align="center">
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">c</mml:mi></mml:math></inlineequation> (Depth Only)
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
<para>
|
|
Return values are placed in memory as follows.
|
|
If <parameter>format</parameter> is
|
|
<constant>GL_STENCIL_INDEX</constant>,
|
|
<constant>GL_DEPTH_COMPONENT</constant>,
|
|
<constant>GL_RED</constant>,
|
|
<constant>GL_GREEN</constant>, or
|
|
<constant>GL_BLUE</constant>,
|
|
a single value is returned and the data for the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>th
|
|
pixel in the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">j</mml:mi></mml:math></inlineequation>th
|
|
row
|
|
is placed in location
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (j) width + i: -->
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mi mathvariant="italic">j</mml:mi>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mi mathvariant="italic">width</mml:mi>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">i</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>.
|
|
<constant>GL_RGB</constant> and <constant>GL_BGR</constant> return three values,
|
|
<constant>GL_RGBA</constant> and <constant>GL_BGRA</constant> return four values for each pixel,
|
|
with all values corresponding to a single pixel occupying contiguous space
|
|
in <parameter>data</parameter>.
|
|
Storage parameters set by <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>,
|
|
such as <constant>GL_PACK_LSB_FIRST</constant> and <constant>GL_PACK_SWAP_BYTES</constant>,
|
|
affect the way that data is written into memory.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry> for a description.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
Values for pixels that lie outside the window
|
|
connected to the current GL context are undefined.
|
|
</para>
|
|
<para>
|
|
If an error is generated,
|
|
no change is made to the contents of <parameter>data</parameter>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>format</parameter> or <parameter>type</parameter> is not an
|
|
accepted value.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if either <parameter>width</parameter> or <parameter>height</parameter> is negative.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>format</parameter> is <constant>GL_STENCIL_INDEX</constant>
|
|
and there is no stencil buffer.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>format</parameter> is <constant>GL_DEPTH_COMPONENT</constant>
|
|
and there is no depth buffer.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>format</parameter> is <constant>GL_DEPTH_STENCIL</constant>
|
|
and there is no depth buffer or if there is no stencil buffer.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>format</parameter> is <constant>GL_DEPTH_STENCIL</constant>
|
|
and <parameter>type</parameter> is not <constant>GL_UNSIGNED_INT_24_8</constant> or <constant>GL_FLOAT_32_UNSIGNED_INT_24_8_REV</constant>.
|
|
</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>data</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 <constant>GL_READ_FRAMEBUFFER_BINDING</constant>
|
|
is non-zero, the read framebuffer is complete, and the value of <constant>GL_SAMPLE_BUFFERS</constant>
|
|
for the read framebuffer is greater than zero.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_INDEX_MODE</constant>
|
|
</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>glPixelStore</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glReadBuffer</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>
|