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From: [e-mail] (robert hood)
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Subject: It should come as no surprise...
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Date: Tue, 31 Oct 1995 13:32:16 -0800 (PST)
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I've had a couple of people ask me about BML scripting for Layout.  One of
the main difference between Modeler and Layout as far as plugins are concerned
is the diversity of plugin types supported by Layout.  While Modeler sports
what is essentially a single type of plugin (even a CommandsSequence plugin
can execute MeshDataEdit functions), Layout plays host to a number of truly
different plugins, each having its own data types and functionality.  Because
of this, a scripting plugin for Layout would have to actually be a number
of *different* plugins, each designed to support the specialized data and
functions intrinsic to a Layout plugin type.

Well, I got bored Sunday afternoon, and decided to try porting BML over
to Layout.  I stripped out all the Modeler functionality (with certain
exceptions, like File Requester and Monitor functions), and from a clean
interpreter, built an Image Filter plugin for Layout.  The Image Filter
mechanism seemed to be the simplist of those available for Layout, so it
seemed like a the best plugin type for a quick test.

Here, then, is a BML/IF script, derived from the "hard" plugin of the
same name, that will post-process a rendered image into its negative.  (As
with all scripts I make public, this actually works -- needless to say,
I was quite pleased when it did =|^).

So, for those of you who've asked me, I guess the answer would be
"yes, it is possible." =|^)

---------------------------------------------------------------------------
// BML/IF:  Negative
//
// if a function is not declared, BML/IF will default its behavior.  The
// available Image Filter functions are:
//
//           process      flags
//
// the plugin interface functions 'create', 'destroy', 'load', 'save', and
// 'copy' are not currently functional, but they do not need to be for this
// particular plugin to work.
//
// NOTE: whether the flags() function is defined or not, the plugin
// automatically has access to the RED, GREEN, BLUE, and ALPHA buffers.

// every process() declaration must accept five arguments
// ('end' is a keyword in BML/IF, so we use 'endtime')

process: width, height, frame, starttime, endtime
{
    var red[width];
    var green[width];
    var blue[width];
    var alpha[width];
    var out[3];
    var i,j;

    moninit(height);

    for(i = 0;i < height;++i)
    {
        red = bufferline(RED,i);
        green = bufferline(GREEN,i);
        blue = bufferline(BLUE,i);
        alpha = bufferline(ALPHA,i);

        for(j = 0;j < width;++j)
        {
            out[1] = 255 - red[j + 1];
            out[2] = 255 - green[j + 1];
            out[3] = 255 - blue[j + 1];

            setrgb(j,i,out);
            setalpha(j,i,alpha[j + 1]);
        }

        if(monstep())
            return;
    }

    monend();
}

// we don't really need this function for this plugin,
// but it is here for illustration

flags
{
    // available buffers are:
    // SPECIAL      LUMINOUS        DIFFUSE
    // MIRROR       TRANS           RAWRED
    // RAWGREEN     RAWBLUE         SHADING
    // SHADOW       GEOMETRY        DEPTH
    // (RED)        (GREEN)         (BLUE)      (ALPHA)

    return(RED,GREEN,BLUE,ALPHA);   // select the defaults just for fun  =|^)
}
---------------------------------------------------------------------------

Render me gone,               |||
Bob                         ^(===)^
-------------------------oOO--(_)--OOo--------------------------------------
Bob Hood            | All governments suffer from a recurring problem:
                    | Power attracts pathological personalities.  It is not
Work: 303-730-1324  | that power corrupts, but that it is magnetic to the
Home: 303-980-8392  | corruptible.  Such people have a tendency to become
[e-mail]    | drunk on violence, a condition to which they are
[e-mail]      | quickly addicted              - Frank Herbert
----------------------------------------------------------------------------
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