[clinton/guile-figl.git] / upstream-doc / man2 / glCopyConvolutionFilter1D.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="glCopyConvolutionFilter1D">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glCopyConvolutionFilter1D</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glCopyConvolutionFilter1D</refname>
        <refpurpose>copy pixels into a one-dimensional convolution filter</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glCopyConvolutionFilter1D</function></funcdef>
                <paramdef>GLenum <parameter>target</parameter></paramdef>
                <paramdef>GLenum <parameter>internalformat</parameter></paramdef>
                <paramdef>GLint <parameter>x</parameter></paramdef>
                <paramdef>GLint <parameter>y</parameter></paramdef>
                <paramdef>GLsizei <parameter>width</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>target</parameter></term>
            <listitem>
                <para>
                    Must be <constant>GL_CONVOLUTION_1D</constant>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>internalformat</parameter></term>
            <listitem>
                <para>
                    The internal format of the convolution filter kernel.
                    The allowable values are
                    <constant>GL_ALPHA</constant>,
                    <constant>GL_ALPHA4</constant>,
                    <constant>GL_ALPHA8</constant>,
                    <constant>GL_ALPHA12</constant>,
                    <constant>GL_ALPHA16</constant>,
                    <constant>GL_LUMINANCE</constant>,
                    <constant>GL_LUMINANCE4</constant>,
                    <constant>GL_LUMINANCE8</constant>,
                    <constant>GL_LUMINANCE12</constant>,
                    <constant>GL_LUMINANCE16</constant>,
                    <constant>GL_LUMINANCE_ALPHA</constant>,
                    <constant>GL_LUMINANCE4_ALPHA4</constant>,
                    <constant>GL_LUMINANCE6_ALPHA2</constant>,
                    <constant>GL_LUMINANCE8_ALPHA8</constant>,
                    <constant>GL_LUMINANCE12_ALPHA4</constant>,
                    <constant>GL_LUMINANCE12_ALPHA12</constant>,
                    <constant>GL_LUMINANCE16_ALPHA16</constant>,
                    <constant>GL_INTENSITY</constant>,
                    <constant>GL_INTENSITY4</constant>,
                    <constant>GL_INTENSITY8</constant>,
                    <constant>GL_INTENSITY12</constant>,
                    <constant>GL_INTENSITY16</constant>,
                    <constant>GL_R3_G3_B2</constant>,
                    <constant>GL_RGB</constant>,
                    <constant>GL_RGB4</constant>,
                    <constant>GL_RGB5</constant>,
                    <constant>GL_RGB8</constant>,
                    <constant>GL_RGB10</constant>,
                    <constant>GL_RGB12</constant>,
                    <constant>GL_RGB16</constant>,
                    <constant>GL_RGBA</constant>,
                    <constant>GL_RGBA2</constant>,
                    <constant>GL_RGBA4</constant>,
                    <constant>GL_RGB5_A1</constant>,
                    <constant>GL_RGBA8</constant>,
                    <constant>GL_RGB10_A2</constant>,
                    <constant>GL_RGBA12</constant>, or
                    <constant>GL_RGBA16</constant>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>x</parameter></term>
            <term><parameter>y</parameter></term>
            <listitem>
                <para>
                    The window space coordinates of the lower-left coordinate of the
                    pixel array to copy.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>width</parameter></term>
            <listitem>
                <para>
                    The width of the pixel array to copy.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glCopyConvolutionFilter1D</function> defines a one-dimensional convolution filter kernel with pixels
            from the current <constant>GL_READ_BUFFER</constant> (rather than from main memory,
            as is the case for <citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>).
        </para>
        <para>
            The screen-aligned pixel rectangle with lower-left corner at (<parameter>x</parameter>,\ <parameter>y</parameter>),
            width <parameter>width</parameter> and height 1 is used to define
            the convolution filter.  If any pixels within this region are
            outside the window that is associated with the GL context, the
            values obtained for those pixels are undefined.
        </para>
        <para>
            The pixels in the rectangle are processed exactly as if <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>
            had been called with <emphasis>format</emphasis>
            set to RGBA, but the process stops just before final conversion.
            The R, G, B, and A components of each pixel are next scaled by the four
            1D <constant>GL_CONVOLUTION_FILTER_SCALE</constant> parameters and biased by the
            four 1D <constant>GL_CONVOLUTION_FILTER_BIAS</constant> parameters.
            (The scale and bias parameters are set by <citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry>
            using the <constant>GL_CONVOLUTION_1D</constant> target and the names
            <constant>GL_CONVOLUTION_FILTER_SCALE</constant> and <constant>GL_CONVOLUTION_FILTER_BIAS</constant>.
            The parameters themselves are vectors of four values that are applied to red,
            green, blue, and alpha, in that order.)
            The R, G, B, and A values are not clamped to [0,1] at any time during this
            process.
        </para>
        <para>
            Each pixel is then converted to the internal format specified by
            <parameter>internalformat</parameter>.
            This conversion simply maps the component values of the pixel (R, G, B,
            and A) to the values included in the internal format (red, green, blue,
            alpha, luminance, and intensity).  The mapping is as follows:
        </para>
        <para>
        </para>
        <informaltable frame="topbot">
            <tgroup cols="7" align="left">
                <colspec colwidth="3*" />
                <colspec colwidth="1*" align="center"/>
                <colspec colwidth="1*" align="center"/>
                <colspec colwidth="1*" align="center"/>
                <colspec colwidth="1*" align="center"/>
                <colspec colwidth="1.7*" align="center"/>
                <colspec colwidth="1.7*" align="center"/>
                <thead>
                    <row>
                        <entry rowsep="1" align="left"><emphasis role="bold">
                        Internal Format
                        </emphasis></entry>
                        <entry rowsep="1" align="center"><emphasis role="bold">
                        Red
                        </emphasis></entry>
                        <entry rowsep="1" align="center"><emphasis role="bold">
                        Green
                        </emphasis></entry>
                        <entry rowsep="1" align="center"><emphasis role="bold">
                        Blue
                        </emphasis></entry>
                        <entry rowsep="1" align="center"><emphasis role="bold">
                        Alpha
                        </emphasis></entry>
                        <entry rowsep="1" align="center"><emphasis role="bold">
                        Luminance
                        </emphasis></entry>
                        <entry rowsep="1" align="center"><emphasis role="bold">
                        Intensity
                        </emphasis></entry>
                    </row>
                </thead>
                <tbody>
                    <row>
                        <entry align="left">
                        <constant>GL_ALPHA</constant>
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        A
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                         
                        </entry>
                    </row>
                    <row>
                        <entry align="left">
                        <constant>GL_LUMINANCE</constant>
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        R
                        </entry>
                        <entry align="center">
                         
                        </entry>
                    </row>
                    <row>
                        <entry align="left">
                        <constant>GL_LUMINANCE_ALPHA</constant>
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        A
                        </entry>
                        <entry align="center">
                        R
                        </entry>
                        <entry align="center">
                         
                        </entry>
                    </row>
                    <row>
                        <entry align="left">
                        <constant>GL_INTENSITY</constant>
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        R
                        </entry>
                    </row>
                    <row>
                        <entry align="left">
                        <constant>GL_RGB</constant>
                        </entry>
                        <entry align="center">
                        R
                        </entry>
                        <entry align="center">
                        G
                        </entry>
                        <entry align="center">
                        B
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                         
                        </entry>
                    </row>
                    <row>
                        <entry align="left">
                        <constant>GL_RGBA</constant>
                        </entry>
                        <entry align="center">
                        R
                        </entry>
                        <entry align="center">
                        G
                        </entry>
                        <entry align="center">
                        B
                        </entry>
                        <entry align="center">
                        A
                        </entry>
                        <entry align="center">
                        </entry>
                        <entry align="center">
                         
                        </entry>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
        <para>
            The red, green, blue, alpha, luminance, and/or intensity components of
            the resulting pixels are stored in floating-point rather than integer
            format.
        </para>
        <para>
            Pixel ordering is such that lower x screen coordinates correspond to
            lower <emphasis>i</emphasis> filter image coordinates.
        </para>
        <para>
            Note that after a convolution is performed, the resulting color
            components are also scaled by their corresponding
            <constant>GL_POST_CONVOLUTION_c_SCALE</constant> parameters and biased by their
            corresponding <constant>GL_POST_CONVOLUTION_c_BIAS</constant> parameters (where
            <emphasis>c</emphasis> takes on the values <emphasis role="bold">RED</emphasis>, <emphasis role="bold">GREEN</emphasis>, <emphasis role="bold">BLUE</emphasis>, and
            <emphasis role="bold">ALPHA</emphasis>).
            These parameters are set by <citerefentry><refentrytitle>glPixelTransfer</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            <function>glCopyConvolutionFilter1D</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_CONVOLUTION_1D</constant>.
        </para>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>internalformat</parameter> is not one of the
            allowable values.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>width</parameter> is less than zero or greater
            than the maximum supported value.
            This value may be queried with <citerefentry><refentrytitle>glGetConvolutionParameter</refentrytitle></citerefentry>
            using target <constant>GL_CONVOLUTION_1D</constant> and name
            <constant>GL_MAX_CONVOLUTION_WIDTH</constant>.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <function>glCopyConvolutionFilter1D</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>glGetConvolutionParameter</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glGetConvolutionFilter</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glPixelTransfer</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>
Commit	Line	Data
7faf1d71 AW	1	<?xml version="1.0" encoding="UTF-8"?>
	2	<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
	3	"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
	4	<refentry id="glCopyConvolutionFilter1D">
	5	<refmeta>
	6	<refmetainfo>
	7	<copyright>
	8	<year>1991-2006</year>
	9	<holder>Silicon Graphics, Inc.</holder>
	10	</copyright>
	11	</refmetainfo>
	12	<refentrytitle>glCopyConvolutionFilter1D</refentrytitle>
	13	<manvolnum>3G</manvolnum>
	14	</refmeta>
	15	<refnamediv>
	16	<refname>glCopyConvolutionFilter1D</refname>
	17	<refpurpose>copy pixels into a one-dimensional convolution filter</refpurpose>
	18	</refnamediv>
	19	<refsynopsisdiv><title>C Specification</title>
	20	<funcsynopsis>
	21	<funcprototype>
	22	<funcdef>void <function>glCopyConvolutionFilter1D</function></funcdef>
	23	<paramdef>GLenum <parameter>target</parameter></paramdef>
	24	<paramdef>GLenum <parameter>internalformat</parameter></paramdef>
	25	<paramdef>GLint <parameter>x</parameter></paramdef>
	26	<paramdef>GLint <parameter>y</parameter></paramdef>
	27	<paramdef>GLsizei <parameter>width</parameter></paramdef>
	28	</funcprototype>
	29	</funcsynopsis>
	30	</refsynopsisdiv>
	31	<refsect1 id="parameters"><title>Parameters</title>
	32	<variablelist>
	33	<varlistentry>
	34	<term><parameter>target</parameter></term>
	35	<listitem>
	36	<para>
	37	Must be <constant>GL_CONVOLUTION_1D</constant>.
	38	</para>
	39	</listitem>
	40	</varlistentry>
	41	<varlistentry>
	42	<term><parameter>internalformat</parameter></term>
	43	<listitem>
	44	<para>
	45	The internal format of the convolution filter kernel.
	46	The allowable values are
	47	<constant>GL_ALPHA</constant>,
	48	<constant>GL_ALPHA4</constant>,
	49	<constant>GL_ALPHA8</constant>,
	50	<constant>GL_ALPHA12</constant>,
	51	<constant>GL_ALPHA16</constant>,
	52	<constant>GL_LUMINANCE</constant>,
	53	<constant>GL_LUMINANCE4</constant>,
	54	<constant>GL_LUMINANCE8</constant>,
	55	<constant>GL_LUMINANCE12</constant>,
	56	<constant>GL_LUMINANCE16</constant>,
	57	<constant>GL_LUMINANCE_ALPHA</constant>,
	58	<constant>GL_LUMINANCE4_ALPHA4</constant>,
	59	<constant>GL_LUMINANCE6_ALPHA2</constant>,
	60	<constant>GL_LUMINANCE8_ALPHA8</constant>,
	61	<constant>GL_LUMINANCE12_ALPHA4</constant>,
	62	<constant>GL_LUMINANCE12_ALPHA12</constant>,
	63	<constant>GL_LUMINANCE16_ALPHA16</constant>,
	64	<constant>GL_INTENSITY</constant>,
65	<constant>GL_INTENSITY4</constant>,
66	<constant>GL_INTENSITY8</constant>,
67	<constant>GL_INTENSITY12</constant>,
68	<constant>GL_INTENSITY16</constant>,
69	<constant>GL_R3_G3_B2</constant>,
70	<constant>GL_RGB</constant>,
71	<constant>GL_RGB4</constant>,
72	<constant>GL_RGB5</constant>,
73	<constant>GL_RGB8</constant>,
74	<constant>GL_RGB10</constant>,
75	<constant>GL_RGB12</constant>,
76	<constant>GL_RGB16</constant>,
77	<constant>GL_RGBA</constant>,
78	<constant>GL_RGBA2</constant>,
79	<constant>GL_RGBA4</constant>,
80	<constant>GL_RGB5_A1</constant>,
81	<constant>GL_RGBA8</constant>,
82	<constant>GL_RGB10_A2</constant>,
83	<constant>GL_RGBA12</constant>, or
84	<constant>GL_RGBA16</constant>.
85	</para>
86	</listitem>
87	</varlistentry>
88	<varlistentry>
89	<term><parameter>x</parameter></term>
90	<term><parameter>y</parameter></term>
91	<listitem>
92	<para>
93	The window space coordinates of the lower-left coordinate of the
94	pixel array to copy.
95	</para>
96	</listitem>
97	</varlistentry>
98	<varlistentry>
99	<term><parameter>width</parameter></term>
100	<listitem>
101	<para>
102	The width of the pixel array to copy.
103	</para>
104	</listitem>
105	</varlistentry>
106	</variablelist>
107	</refsect1>
108	<refsect1 id="description"><title>Description</title>
109	<para>
110	<function>glCopyConvolutionFilter1D</function> defines a one-dimensional convolution filter kernel with pixels
111	from the current <constant>GL_READ_BUFFER</constant> (rather than from main memory,
112	as is the case for <citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>).
113	</para>
114	<para>
115	The screen-aligned pixel rectangle with lower-left corner at (<parameter>x</parameter>,\ <parameter>y</parameter>),
116	width <parameter>width</parameter> and height 1 is used to define
117	the convolution filter. If any pixels within this region are
118	outside the window that is associated with the GL context, the
119	values obtained for those pixels are undefined.
120	</para>
121	<para>
122	The pixels in the rectangle are processed exactly as if <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>
123	had been called with <emphasis>format</emphasis>
124	set to RGBA, but the process stops just before final conversion.
125	The R, G, B, and A components of each pixel are next scaled by the four
126	1D <constant>GL_CONVOLUTION_FILTER_SCALE</constant> parameters and biased by the
127	four 1D <constant>GL_CONVOLUTION_FILTER_BIAS</constant> parameters.
128	(The scale and bias parameters are set by <citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry>
129	using the <constant>GL_CONVOLUTION_1D</constant> target and the names
130	<constant>GL_CONVOLUTION_FILTER_SCALE</constant> and <constant>GL_CONVOLUTION_FILTER_BIAS</constant>.
131	The parameters themselves are vectors of four values that are applied to red,
132	green, blue, and alpha, in that order.)
133	The R, G, B, and A values are not clamped to [0,1] at any time during this
134	process.
135	</para>
136	<para>
137	Each pixel is then converted to the internal format specified by
138	<parameter>internalformat</parameter>.
139	This conversion simply maps the component values of the pixel (R, G, B,
140	and A) to the values included in the internal format (red, green, blue,
141	alpha, luminance, and intensity). The mapping is as follows:
142	</para>
143	<para>
144	</para>
145	<informaltable frame="topbot">
146	<tgroup cols="7" align="left">
147	<colspec colwidth="3*" />
148	<colspec colwidth="1*" align="center"/>
149	<colspec colwidth="1*" align="center"/>
150	<colspec colwidth="1*" align="center"/>
151	<colspec colwidth="1*" align="center"/>
152	<colspec colwidth="1.7*" align="center"/>
153	<colspec colwidth="1.7*" align="center"/>
154	<thead>
155	<row>
156	<entry rowsep="1" align="left"><emphasis role="bold">
157	Internal Format
158	</emphasis></entry>
159	<entry rowsep="1" align="center"><emphasis role="bold">
160	Red
161	</emphasis></entry>
162	<entry rowsep="1" align="center"><emphasis role="bold">
163	Green
164	</emphasis></entry>
165	<entry rowsep="1" align="center"><emphasis role="bold">
166	Blue
167	</emphasis></entry>
168	<entry rowsep="1" align="center"><emphasis role="bold">
169	Alpha
170	</emphasis></entry>
171	<entry rowsep="1" align="center"><emphasis role="bold">
172	Luminance
173	</emphasis></entry>
174	<entry rowsep="1" align="center"><emphasis role="bold">
175	Intensity
176	</emphasis></entry>
177	</row>
178	</thead>
179	<tbody>
180	<row>
181	<entry align="left">
182	<constant>GL_ALPHA</constant>
183	</entry>
184	<entry align="center">
185	</entry>
186	<entry align="center">
187	</entry>
188	<entry align="center">
189	</entry>
190	<entry align="center">
191	A
192	</entry>
193	<entry align="center">
194	</entry>
195	<entry align="center">
196
197	</entry>
198	</row>
199	<row>
200	<entry align="left">
201	<constant>GL_LUMINANCE</constant>
202	</entry>
203	<entry align="center">
204	</entry>
205	<entry align="center">
206	</entry>
207	<entry align="center">
208	</entry>
209	<entry align="center">
210	</entry>
211	<entry align="center">
212	R
213	</entry>
214	<entry align="center">
215
216	</entry>
217	</row>
218	<row>
219	<entry align="left">
220	<constant>GL_LUMINANCE_ALPHA</constant>
221	</entry>
222	<entry align="center">
223	</entry>
224	<entry align="center">
225	</entry>
226	<entry align="center">
227	</entry>
228	<entry align="center">
229	A
230	</entry>
231	<entry align="center">
232	R
233	</entry>
234	<entry align="center">
235
236	</entry>
237	</row>
238	<row>
239	<entry align="left">
240	<constant>GL_INTENSITY</constant>
241	</entry>
242	<entry align="center">
243	</entry>
244	<entry align="center">
245	</entry>
246	<entry align="center">
247	</entry>
248	<entry align="center">
249	</entry>
250	<entry align="center">
251	</entry>
252	<entry align="center">
253	R
254	</entry>
255	</row>
256	<row>
257	<entry align="left">
258	<constant>GL_RGB</constant>
259	</entry>
260	<entry align="center">
261	R
262	</entry>
263	<entry align="center">
264	G
265	</entry>
266	<entry align="center">
267	B
268	</entry>
269	<entry align="center">
270	</entry>
271	<entry align="center">
272	</entry>
273	<entry align="center">
274
275	</entry>
276	</row>
277	<row>
278	<entry align="left">
279	<constant>GL_RGBA</constant>
280	</entry>
281	<entry align="center">
282	R
283	</entry>
284	<entry align="center">
285	G
286	</entry>
287	<entry align="center">
288	B
289	</entry>
290	<entry align="center">
291	A
292	</entry>
293	<entry align="center">
294	</entry>
295	<entry align="center">
296
297	</entry>
298	</row>
299	</tbody>
300	</tgroup>
301	</informaltable>
302	<para>
303	The red, green, blue, alpha, luminance, and/or intensity components of
304	the resulting pixels are stored in floating-point rather than integer
305	format.
306	</para>
307	<para>
308	Pixel ordering is such that lower x screen coordinates correspond to
309	lower <emphasis>i</emphasis> filter image coordinates.
310	</para>
311	<para>
312	Note that after a convolution is performed, the resulting color
313	components are also scaled by their corresponding
314	<constant>GL_POST_CONVOLUTION_c_SCALE</constant> parameters and biased by their
315	corresponding <constant>GL_POST_CONVOLUTION_c_BIAS</constant> parameters (where
316	<emphasis>c</emphasis> takes on the values <emphasis role="bold">RED</emphasis>, <emphasis role="bold">GREEN</emphasis>, <emphasis role="bold">BLUE</emphasis>, and
317	<emphasis role="bold">ALPHA</emphasis>).
318	These parameters are set by <citerefentry><refentrytitle>glPixelTransfer</refentrytitle></citerefentry>.
319	</para>
320	</refsect1>
321	<refsect1 id="notes"><title>Notes</title>
322	<para>
323	<function>glCopyConvolutionFilter1D</function> is present only if <code>ARB_imaging</code> is returned when <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>
324	is called with an argument of <constant>GL_EXTENSIONS</constant>.
325	</para>
326	</refsect1>
327	<refsect1 id="errors"><title>Errors</title>
328	<para>
329	<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not
330	<constant>GL_CONVOLUTION_1D</constant>.
331	</para>
332	<para>
333	<constant>GL_INVALID_ENUM</constant> is generated if <parameter>internalformat</parameter> is not one of the
334	allowable values.
335	</para>
336	<para>
337	<constant>GL_INVALID_VALUE</constant> is generated if <parameter>width</parameter> is less than zero or greater
338	than the maximum supported value.
339	This value may be queried with <citerefentry><refentrytitle>glGetConvolutionParameter</refentrytitle></citerefentry>
340	using target <constant>GL_CONVOLUTION_1D</constant> and name
341	<constant>GL_MAX_CONVOLUTION_WIDTH</constant>.
342	</para>
343	<para>
344	<constant>GL_INVALID_OPERATION</constant> is generated if <function>glCopyConvolutionFilter1D</function> is executed
345	between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding
346	execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
347	</para>
348	</refsect1>
349	<refsect1 id="associatedgets"><title>Associated Gets</title>
350	<para>
351	<citerefentry><refentrytitle>glGetConvolutionParameter</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glGetConvolutionFilter</refentrytitle></citerefentry>
352	</para>
353	</refsect1>
354	<refsect1 id="seealso"><title>See Also</title>
355	<para>
356	<citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>,
357	<citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry>,
358	<citerefentry><refentrytitle>glPixelTransfer</refentrytitle></citerefentry>
359	</para>
360	</refsect1>
361	<refsect1 id="Copyright"><title>Copyright</title>
362	<para>
363	Copyright <trademark class="copyright"></trademark> 1991-2006
364	Silicon Graphics, Inc. This document is licensed under the SGI
365	Free Software B License. For details, see
366	<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
367	</para>
368	</refsect1>
369	</refentry>