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238 lines
13 KiB
XML
238 lines
13 KiB
XML
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<?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="glGetPixelMap">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glGetPixelMap</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetPixelMap</refname>
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<refpurpose>return the specified pixel map</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>glGetPixelMapfv</function></funcdef>
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<paramdef>GLenum <parameter>map</parameter></paramdef>
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<paramdef>GLfloat * <parameter>data</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetPixelMapuiv</function></funcdef>
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<paramdef>GLenum <parameter>map</parameter></paramdef>
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<paramdef>GLuint * <parameter>data</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetPixelMapusv</function></funcdef>
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<paramdef>GLenum <parameter>map</parameter></paramdef>
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<paramdef>GLushort * <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>map</parameter></term>
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<listitem>
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<para>
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Specifies the name of the pixel map to return.
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Accepted values are
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<constant>GL_PIXEL_MAP_I_TO_I</constant>,
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<constant>GL_PIXEL_MAP_S_TO_S</constant>,
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<constant>GL_PIXEL_MAP_I_TO_R</constant>,
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<constant>GL_PIXEL_MAP_I_TO_G</constant>,
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<constant>GL_PIXEL_MAP_I_TO_B</constant>,
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<constant>GL_PIXEL_MAP_I_TO_A</constant>,
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<constant>GL_PIXEL_MAP_R_TO_R</constant>,
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<constant>GL_PIXEL_MAP_G_TO_G</constant>,
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<constant>GL_PIXEL_MAP_B_TO_B</constant>, and
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<constant>GL_PIXEL_MAP_A_TO_A</constant>.
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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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Returns the pixel map contents.
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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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See the <citerefentry><refentrytitle>glPixelMap</refentrytitle></citerefentry> reference page for a description of the acceptable
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values for the <parameter>map</parameter> parameter.
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<function>glGetPixelMap</function> returns in <parameter>data</parameter> the contents of the pixel map
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specified in <parameter>map</parameter>.
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Pixel maps are used during the execution of
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<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyPixels</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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<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>, and
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<citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>.
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to map color indices,
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stencil indices,
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color components,
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and depth components to other values.
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</para>
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<para>
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If a non-zero named buffer object is bound to the <constant>GL_PIXEL_PACK_BUFFER</constant> target
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(see <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>) while a pixel map is
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requested, <parameter>data</parameter> is treated as a byte offset into the buffer object's data store.
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</para>
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<para>
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Unsigned integer values,
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if requested,
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are linearly mapped from the internal fixed or floating-point representation
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such that 1.0 maps to the largest representable integer value,
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and 0.0 maps to 0.
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Return unsigned integer values are undefined if the map value was
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not in the range [0,1].
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</para>
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<para>
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To determine the required size of <parameter>map</parameter>,
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call <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with the appropriate symbolic
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constant.
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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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If an error is generated,
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no change is made to the contents of <parameter>data</parameter>.
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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_ENUM</constant> is generated if <parameter>map</parameter> is not an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_PACK_BUFFER</constant> target and the buffer object's data store is currently mapped.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_PACK_BUFFER</constant> target and the data would be packed to the buffer
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object such that the memory writes required would exceed the data store size.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <function>glGetPixelMapfv</function> if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_PACK_BUFFER</constant> target and <parameter>data</parameter> is not evenly divisible
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into the number of bytes needed to store in memory a GLfloat datum.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <function>glGetPixelMapuiv</function> if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_PACK_BUFFER</constant> target and <parameter>data</parameter> is not evenly divisible
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into the number of bytes needed to store in memory a GLuint datum.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <function>glGetPixelMapusv</function> if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_PACK_BUFFER</constant> target and <parameter>data</parameter> is not evenly divisible
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into the number of bytes needed to store in memory a GLushort datum.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetPixelMap</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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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>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_I_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_S_TO_S_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_R_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_G_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_B_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_A_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_R_TO_R_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_G_TO_G_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_B_TO_B_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_A_TO_A_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_PIXEL_MAP_TABLE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_PACK_BUFFER_BINDING</constant>
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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>glColorSubTable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glConvolutionFilter2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyColorSubTable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyColorTable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetHistogram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetMinmax</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetTexImage</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPixelMap</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPixelTransfer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glSeparableFilter2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage1D</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>glTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage3D</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> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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