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scatter.c

/**
 * $Id: scatter.c,v 1.2 2003/05/02 20:52:58 sirdude Exp $
 *
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

#include "plugin.h"

/* ******************** GLOBAL VARIABLES ***************** */


char name[24]= "scatter";

/* structure for buttons, 
 *  butcode      name           default  min  max  0
 */

VarStruct varstr[]= {
      LABEL,            "Input: 1 strip", 0.0, 0.0, 0.0, "", 
      NUM|INT,    "seed: ",         1.0,  0.0, 10.0, "Offset in random table", 
      NUMSLI|FLO, "swing: ",        1.0,  0.0, 3.0, "The amplitude, width of the effect", 
      TOG|INT,    "wrap",                 0.0,  0.0, 1.0, "Cyclic wrap around the left/right edges", 
      NUM|INT,    "type: ",         1.0,  0.0, 1.0, "Type 1 is random for each frame", 
};

/* The cast struct is for input in the main doit function
   Varstr and Cast must have the same variables in the same order */ 

typedef struct Cast {
      int dummy;              /* because of the 'label' button */
      int seed;
      float swing;
      int wrap;
      int type;
} Cast;

/* cfra: the current frame */

float cfra;

void plugin_seq_doit(Cast *, float, float, int, int, ImBuf *, ImBuf *, ImBuf *, ImBuf *);


/* ******************** Fixed functions ***************** */

int plugin_seq_getversion(void) 
{
      return B_PLUGIN_VERSION;
}

void plugin_but_changed(int but) 
{
}

void plugin_init()
{
}

void plugin_getinfo(PluginInfo *info)
{
      info->name= name;
      info->nvars= sizeof(varstr)/sizeof(VarStruct);
      info->cfra= &cfra;

      info->varstr= varstr;

      info->init= plugin_init;
      info->seq_doit= (SeqDoit) plugin_seq_doit;
      info->callback= plugin_but_changed;
}


/* ************************************************************
      Scatter
      
      with usage of ImBuf rect operation.
      
   ************************************************************ */

static void ibufrectop(ImBuf *dbuf, ImBuf *sbuf,      
                        int destx, int desty, 
                        int srcx, int srcy, int width, int height,
                        void (*operation)(), 
                        int value)
{
      uint *drect,*srect;

      if (dbuf == 0) return;
      if (operation == 0) return;

      if (destx < 0){
            srcx -= destx ;
            width += destx ;
            destx = 0;
      }
      if (srcx < 0){
            destx -= srcx ;
            width += destx ;
            srcx = 0;
      }
      if (desty < 0){
            srcy -= desty ;
            height += desty ;
            desty = 0;
      }
      if (srcy < 0){
            desty -= srcy ;
            height += desty ;
            srcy = 0;
      }

      if (width > dbuf->x - destx) width = dbuf->x - destx;
      if (height > dbuf->y - desty) height = dbuf->y - desty;
      if (sbuf){
            if (width > sbuf->x - srcx) width = sbuf->x - srcx;
            if (height > sbuf->y - srcy) height = sbuf->y - srcy;
      }

      if (width <= 0) return;
      if (height <= 0) return;

      drect = dbuf->rect;
      if (sbuf) srect = sbuf->rect;

      drect += desty * dbuf->x;
      drect += destx;
      destx = dbuf->x;

      if (sbuf) {
            srect += srcy * sbuf->x;
            srect += srcx;
            srcx = sbuf->x;
      } else{
            srect = drect;
            srcx = destx;
      }

      for (;height > 0; height--){
            operation(drect, srect, width, value);
            drect += destx;
            srect += srcx;
      }
}

static void rectcpy(uint *drect, uint *srect, int x) {
      memcpy(drect,srect, x * sizeof(int));
}

static void rectfill(uint *drect, uint *srect, int x, int value)
{
      for (;x > 0; x--) *drect++ = value;
}


void plugin_seq_doit(Cast *cast, float facf0, float facf1, int sx, int sy, ImBuf *ibuf1, ImBuf *ibuf2, ImBuf *out, ImBuf *use)
{
      float f1, f2, t1, t2, t3;
      int x, y, lr;
      
      /* fill imbuf 'out' with black */
      ibufrectop(out, ibuf1,0,0,0,0,32767,32767,rectfill, 0);

      switch (cast->type) {
            case 0:
                  srand48(cast->seed);
                  break;
            case 1:
                  srand48(cast->seed + facf0 * 1000);
                  break;
      }

      for (y = 0; y < sy; y++) {
            switch (cast->type) {
                  case 0:
                        if ((y & 1) == 0) {
                              f1 = drand48() - 0.5;
                              f2 = drand48() - 0.5;
                              f1 = cast->swing * f1;
                              f2 = cast->swing * f2;
                              if (cast->wrap) f2 += 1.0;
                              lr = drand48()>0.5;
                              t1 = facf0;
                        } else t1 = facf1;
                        
                        t2 = 1.0 - t1;
                        t3 = 3.0 * (f1 * t1 * t1 * t2 + f2 * t1 * t2 * t2);
                        if (cast->wrap) t3 += t2 * t2 * t2;
                        x = sx * t3;
                        if (lr) x = -x;
                        break;
                  case 1:
                        f1 = drand48() - 0.5;
                        f1 = f1 * cast->swing;
                        if ((y & 1) == 0) f1 *= facf0;
                        else f1 *= facf1;
                        x = f1 * sx;
                        break;
            }
            
            ibufrectop(out, ibuf1, 0, y, x, y, 32767, 1, rectcpy, 0);
            if (cast->wrap) {
                  ibufrectop(out, ibuf1, 0, y, x + sx, y, 32767, 1, rectcpy, 0);
                  ibufrectop(out, ibuf1, 0, y, x + sx + sx, y, 32767, 1, rectcpy, 0);
                  ibufrectop(out, ibuf1, 0, y, x - sx, y, 32767, 1, rectcpy, 0);
                  ibufrectop(out, ibuf1, 0, y, x - sx - sx, y, 32767, 1, rectcpy, 0);
            }
      }
}


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