255 lines
6.8 KiB
Text
255 lines
6.8 KiB
Text
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML>
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<HEAD>
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<TITLE>Animated Textures</TITLE>
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<LINK type="text/css" rel="stylesheet" href="../webdocs.css">
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</HEAD>
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<BODY>
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<H1>Animated Textures</H1>
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<P>Forget your silly 10 fps looping quake animated textures.
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Now you can create complex multi-framed animated textures AND
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control them from APE. Explosion effects, computer terminal
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displays, animated 2D user-interface controls, even the mouse!
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....the possibilities are endless.</P>
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<PRE class="syntax">
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<B>ATD1</B>
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<B>type = animation</B>
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<B>colortype =</B> <I>integer</I>
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<B>width =</B> <I>integer</I>
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<B>height =</B> <I>integer</I>
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<B>bilinear =</B> <I>integer</I> (optional, def=1)
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<B>clamp =</B> <I>integer</I> (optional, def=0)
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</PRE>
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<PRE class="syntax">
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<B>!bitmap</B>
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<B>file =</B> <I>filename</I>
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<B>!bitmap</B>
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... repeat for all bitmaps
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</PRE>
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<PRE class="syntax">
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<B>!frame</B>
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<B>bitmap =</B> <I>integer</I>
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<B>next =</B> <I>integer</I> (optional)
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<B>wait =</B> <I>float</I> (optional)
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<B>x =</B> <I>integer</I> (optional)
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<B>y =</B> <I>integer</I> (optional)
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<B>!frame</B>
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... repeat for all frames
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</PRE>
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<H4>Parameters (main)</H4>
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<DL>
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<DT><I>colortype</I></DT>
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<DD>
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Determines how the texture is stored on the card. All
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source bitmaps must be in the same format. Can be one of
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the following values:
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<TABLE>
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<TR>
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<TH>value</TH>
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<TH>meaning</TH>
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</TR>
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<TR>
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<TD>1</TD>
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<TD>8-bit greyscale PNG</TD>
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</TR>
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<TR>
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<TD>2</TD>
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<TD>8-bit greyscale + 8-bit alpha PNG</TD>
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</TR>
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<TR>
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<TD>3</TD>
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<TD>24-bit RGB PNG</TD>
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</TR>
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<TR>
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<TD>4</TD>
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<TD>24-bit RGB + 8-bit alpha PNG</TD>
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</TR>
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</TABLE>
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</DD>
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<DT><I>width</I></DT>
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<DD>Width of output texture, must be power of two.</DD>
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<DT><I>height</I></DT>
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<DD>Height of output texture, must be power of two.</DD>
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<DT><I>bilinear</I></DT>
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<DD>Must be 0 or 1, controls whether bilinear filtering is
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used on this image. <B>Default is 1.</B></DD>
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<DT><I>clamp</I></DT>
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<DD>Must be 0 or 1, controls whether the texture is clamped
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to its edges or is repeated (tiled). It must be 1 if you
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want to use an animated parabolic environment map. <B>
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Default is 0.</B></DD>
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</DL>
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<H4>Parameters (bitmap list)</H4>
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<DL>
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<DT><I>file</I></DT>
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<DD>Specifies a source image file. Must be in PNG format and
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have the same color type as specified earlier by <B>
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colortype</B>. It can be <I>any</I> size as long as it not
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larger than the output size in any dimension.</DD>
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</DL>
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<H4>Parameters (frame list)</H4>
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<DL>
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<DT><I>bitmap</I></DT>
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<DD>Integer specifying which file specified in the bitmap
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list to use. The first bitmap you specified is numbered 0;
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subsequent bitmaps are numbered 1, 2, 3, and so on.</DD>
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<DT><I>next</I></DT>
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<DD>Integer specifying the next frame in the animation
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sequence. The first frame you specified is numbered 0;
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subsequence frames are numbered 1, 2, 3, and so on. If you
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specify −1, then the image will stop animating after
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this frame. The default value is −1.</DD>
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<DT><I>wait</I></DT>
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<DD>Floating point value specifying the number of seconds to
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wait before displaying the next frame in the animation
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sequence. If you specify 0, then the next frame will be
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uploaded on the next rendering pass. If you specify −1,
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then the current frame is uploaded immediately and the next
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frame in the sequence is processed (see Remarks section). The
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default value is 0.</DD>
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<DT><I>x</I></DT>
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<DD>Integer specifying the x offset into the output texture
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where the bitmap should appear.</DD>
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<DT><I>y</I></DT>
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<DD>Integer specifying the y offset into the output texture
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where the bitmap should appear.</DD>
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</DL>
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<H4>Remarks</H4>
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<P>Since this new animated texture code uses frame uploading,
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having many frames of animation takes up main memory instead of
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video card texture memory. The amount of video texture memory
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used is never more than the amount required to store the output
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frame. However, this doesn't mean animated textures are free
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and you should frame-output the FF8 opening movie into PNG
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format and watch it play in Anachronox.</P>
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<H4>Examples</H4>
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<P>Although they no longer take up video memory, they still do
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take up main memory, and taking up too much main memory is a
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bad thing. One way to reduce your RAM usage is to not change
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the all of the texture in the animation frame. For example, say
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you skin a robot, and you want one of his lights to blink.
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Instead of making two copies of the skin with the light either
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on or off, you can have one frame be the original skin, and one
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frame be a very small bitmap containing only the part of the
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skin that changes with the blinking light. Then you can do
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something like this:</P>
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<TABLE>
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<TR>
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<TH>base.png</TH>
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<TH>on.png</TH>
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<TH>off.png</TH>
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<TH>output</TH>
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</TR>
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<TR>
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<TD><IMG src="animex_base.png"></TD>
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<TD><IMG src="animex_on.png"></TD>
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<TD><IMG src="animex_off.png"></TD>
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<TD><IMG src="animexample.gif"></TD>
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</TR>
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</TABLE>
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<PRE class="syntax">
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ATD1
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type=animation
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colortype=3
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width=128
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height=128
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!bitmap
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file=models/robot/base.png
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!bitmap
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file=models/robot/on.png
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!bitmap
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file=models/robot/off.png
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# Frame 0 is what is always uploaded to the texture
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# before anything is displayed. In this case, wait
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# is -1 so the next frame (1) is immediately processed.
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!frame
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bitmap=0
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next=1
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wait=-1
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# Frame 1 says to upload on.png at the specified
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# offsets into the texture. Then it waits half
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# a second before processing the next frame.
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!frame
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bitmap=1
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next=2
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wait=.5
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x=46
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y=44
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# Frame 2 uploads off.png at the specified offset.
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# This replaces the center light with a picture
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# of the light turned off. It then waits .2
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# seconds before looping back to frame 1.
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!frame
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bitmap=2
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next=1
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wait=.2
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x=46
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y=44
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</PRE>
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<P>Look in <B>map joeyproc</B> for some examples in animated
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textures.</P>
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</BODY>
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</HTML>
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