Fix bugs in previous commit that caused FTBFS in synfig and ETL FTBFS with older...
[synfig.git] / synfig-core / tags / synfig_0_61_07 / src / modules / mod_noise / random.cpp
1 /* === S Y N F I G ========================================================= */
2 /*!     \file mod_noise/random.cpp
3 **      \brief blehh
4 **
5 **      $Id$
6 **
7 **      \legal
8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
9 **      Copyright (c) 2007 Chris Moore
10 **
11 **      This package is free software; you can redistribute it and/or
12 **      modify it under the terms of the GNU General Public License as
13 **      published by the Free Software Foundation; either version 2 of
14 **      the License, or (at your option) any later version.
15 **
16 **      This package is distributed in the hope that it will be useful,
17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 **      General Public License for more details.
20 **      \endlegal
21 */
22 /* ========================================================================= */
23
24 /* === H E A D E R S ======================================================= */
25
26 #ifdef USING_PCH
27 #       include "pch.h"
28 #else
29 #ifdef HAVE_CONFIG_H
30 #       include <config.h>
31 #endif
32
33 #include "random.h"
34 #include <synfig/quick_rng.h>
35 #include <cmath>
36 #include <cstdlib>
37 #endif
38
39 /* === M A C R O S ========================================================= */
40
41 #define PI      (3.1415927)
42
43 /* === G L O B A L S ======================================================= */
44
45 /* === P R O C E D U R E S ================================================= */
46
47 /* === M E T H O D S ======================================================= */
48
49 void
50 Random::set_seed(int x)
51 {
52         seed_=x;
53 }
54
55 float
56 Random::operator()(const int salt,const int x,const int y,const int t)const
57 {
58         static const unsigned int a(21870);
59         static const unsigned int b(11213);
60         static const unsigned int c(36979);
61         static const unsigned int d(31337);
62
63         quick_rng rng(
64                 ( static_cast<unsigned int>(x+y)        * a ) ^
65                 ( static_cast<unsigned int>(y+t)        * b ) ^
66                 ( static_cast<unsigned int>(t+x)        * c ) ^
67                 ( static_cast<unsigned int>(seed_+salt) * d )
68         );
69
70         return rng.f() * 2.0f - 1.0f;
71 }
72
73 float
74 Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
75 {
76         int x((int)floor(xf));
77         int y((int)floor(yf));
78         int t((int)floor(tf));
79
80         switch(smooth)
81         {
82         case 4: // cubic
83                 {
84                         #define f(j,i,k)        ((*this)(subseed,i,j,k))
85                         //Using catmull rom interpolation because it doesn't blur at all
86                         //bezier curve with intermediate ctrl pts: 0.5/3(p(i+1) - p(i-1)) and similar
87                         float xfa [4], tfa[4];
88
89                         //precalculate indices (all clamped) and offset
90                         const int xa[] = {x-1,x,x+1,x+2};
91
92                         const int ya[] = {y-1,y,y+1,y+2};
93
94                         const int ta[] = {t-1,t,t+1,t+2};
95
96                         const float dx(xf-x);
97                         const float dy(yf-y);
98                         const float dt(tf-t);
99
100                         //figure polynomials for each point
101                         const float txf[] =
102                         {
103                                 0.5*dx*(dx*(dx*(-1) + 2) - 1),  //-t + 2t^2 -t^3
104                                 0.5*(dx*(dx*(3*dx - 5)) + 2),   //2 - 5t^2 + 3t^3
105                                 0.5*dx*(dx*(-3*dx + 4) + 1),    //t + 4t^2 - 3t^3
106                                 0.5*dx*dx*(dx-1)                                //-t^2 + t^3
107                         };
108
109                         const float tyf[] =
110                         {
111                                 0.5*dy*(dy*(dy*(-1) + 2) - 1),  //-t + 2t^2 -t^3
112                                 0.5*(dy*(dy*(3*dy - 5)) + 2),   //2 - 5t^2 + 3t^3
113                                 0.5*dy*(dy*(-3*dy + 4) + 1),    //t + 4t^2 - 3t^3
114                                 0.5*dy*dy*(dy-1)                                //-t^2 + t^3
115                         };
116
117                         const float ttf[] =
118                         {
119                                 0.5*dt*(dt*(dt*(-1) + 2) - 1),  //-t + 2t^2 -t^3
120                                 0.5*(dt*(dt*(3*dt - 5)) + 2),   //2 - 5t^2 + 3t^3
121                                 0.5*dt*(dt*(-3*dt + 4) + 1),    //t + 4t^2 - 3t^3
122                                 0.5*dt*dt*(dt-1)                                //-t^2 + t^3
123                         };
124
125                         //evaluate polynomial for each row
126                         for(int i = 0; i < 4; ++i)
127                         {
128                                 for(int j = 0; j < 4; ++j)
129                                 {
130                                         tfa[j] = f(ya[i],xa[j],ta[0])*ttf[0] + f(ya[i],xa[j],ta[1])*ttf[1] + f(ya[i],xa[j],ta[2])*ttf[2] + f(ya[i],xa[j],ta[3])*ttf[3];
131                                 }
132                                 xfa[i] = tfa[0]*txf[0] + tfa[1]*txf[1] + tfa[2]*txf[2] + tfa[3]*txf[3];
133                         }
134
135                         //return the cumulative column evaluation
136                         return xfa[0]*tyf[0] + xfa[1]*tyf[1] + xfa[2]*tyf[2] + xfa[3]*tyf[3];
137 #undef f
138                 }
139                 break;
140
141
142         case 5: // Fast Spline (non-animated)
143                 {
144 #define P(x)    (((x)>0)?((x)*(x)*(x)):0.0f)
145 #define R(x)    ( P(x+2) - 4.0f*P(x+1) + 6.0f*P(x) - 4.0f*P(x-1) )*(1.0f/6.0f)
146 #define F(i,j)  ((*this)(subseed,i+x,j+y)*(R((i)-a)*R(b-(j))))
147 #define FT(i,j,k)       ((*this)(subseed,i+x,j+y,k+t)*(R((i)-a)*R(b-(j))*R((k)-c)))
148 #define Z(i,j) ret+=F(i,j)
149 #define ZT(i,j,k) ret+=FT(i,j,k)
150 #define X(i,j)  // placeholder... To make box more symmetric
151 #define XT(i,j,k)       // placeholder... To make box more symmetric
152
153                 float a(xf-x), b(yf-y);
154
155                 // Interpolate
156                 float ret(F(0,0));
157                 Z(-1,-1); Z(-1, 0); Z(-1, 1); Z(-1, 2);
158                 Z( 0,-1); X( 0, 0); Z( 0, 1); Z( 0, 2);
159                 Z( 1,-1); Z( 1, 0); Z( 1, 1); Z( 1, 2);
160                 Z( 2,-1); Z( 2, 0); Z( 2, 1); Z( 2, 2);
161
162                 return ret;
163         }
164
165         case 3: // Spline (animated)
166                 {
167                         float a(xf-x), b(yf-y), c(tf-t);
168
169                         // Interpolate
170                         float ret(FT(0,0,0));
171                         ZT(-1,-1,-1); ZT(-1, 0,-1); ZT(-1, 1,-1); ZT(-1, 2,-1);
172                         ZT( 0,-1,-1); ZT( 0, 0,-1); ZT( 0, 1,-1); ZT( 0, 2,-1);
173                         ZT( 1,-1,-1); ZT( 1, 0,-1); ZT( 1, 1,-1); ZT( 1, 2,-1);
174                         ZT( 2,-1,-1); ZT( 2, 0,-1); ZT( 2, 1,-1); ZT( 2, 2,-1);
175
176                         ZT(-1,-1, 0); ZT(-1, 0, 0); ZT(-1, 1, 0); ZT(-1, 2, 0);
177                         ZT( 0,-1, 0); XT( 0, 0, 0); ZT( 0, 1, 0); ZT( 0, 2, 0);
178                         ZT( 1,-1, 0); ZT( 1, 0, 0); ZT( 1, 1, 0); ZT( 1, 2, 0);
179                         ZT( 2,-1, 0); ZT( 2, 0, 0); ZT( 2, 1, 0); ZT( 2, 2, 0);
180
181                         ZT(-1,-1, 1); ZT(-1, 0, 1); ZT(-1, 1, 1); ZT(-1, 2, 1);
182                         ZT( 0,-1, 1); ZT( 0, 0, 1); ZT( 0, 1, 1); ZT( 0, 2, 1);
183                         ZT( 1,-1, 1); ZT( 1, 0, 1); ZT( 1, 1, 1); ZT( 1, 2, 1);
184                         ZT( 2,-1, 1); ZT( 2, 0, 1); ZT( 2, 1, 1); ZT( 2, 2, 1);
185
186                         ZT(-1,-1, 2); ZT(-1, 0, 2); ZT(-1, 1, 2); ZT(-1, 2, 2);
187                         ZT( 0,-1, 2); ZT( 0, 0, 2); ZT( 0, 1, 2); ZT( 0, 2, 2);
188                         ZT( 1,-1, 2); ZT( 1, 0, 2); ZT( 1, 1, 2); ZT( 1, 2, 2);
189                         ZT( 2,-1, 2); ZT( 2, 0, 2); ZT( 2, 1, 2); ZT( 2, 2, 2);
190
191                         return ret;
192
193 /*
194
195                         float dx=xf-x;
196                         float dy=yf-y;
197                         float dt=tf-t;
198
199                         float ret=0;
200                         int i,j,h;
201                         for(h=-1;h<=2;h++)
202                                 for(i=-1;i<=2;i++)
203                                         for(j=-1;j<=2;j++)
204                                                 ret+=(*this)(subseed,i+x,j+y,h+t)*(R(i-dx)*R(j-dy)*R(h-dt));
205                         return ret;
206 */
207                 }
208                 break;
209 #undef X
210 #undef Z
211 #undef F
212 #undef P
213 #undef R
214
215         case 2: // Cosine
216         if((float)t==tf)
217         {
218                 int x((int)floor(xf));
219                 int y((int)floor(yf));
220                 float a=xf-x;
221                 float b=yf-y;
222                 a=(1.0f-cos(a*PI))*0.5f;
223                 b=(1.0f-cos(b*PI))*0.5f;
224                 float c=1.0-a;
225                 float d=1.0-b;
226                 int x2=x+1,y2=y+1;
227                 return
228                         (*this)(subseed,x,y,t)*(c*d)+
229                         (*this)(subseed,x2,y,t)*(a*d)+
230                         (*this)(subseed,x,y2,t)*(c*b)+
231                         (*this)(subseed,x2,y2,t)*(a*b);
232         }
233         else
234         {
235                 float a=xf-x;
236                 float b=yf-y;
237                 float c=tf-t;
238
239                 a=(1.0f-cos(a*3.1415927))*0.5f;
240                 b=(1.0f-cos(b*3.1415927))*0.5f;
241
242                 // We don't perform this on the time axis, otherwise we won't
243                 // get smooth motion
244                 //c=(1.0f-cos(c*3.1415927))*0.5f;
245
246                 float d=1.0-a;
247                 float e=1.0-b;
248                 float f=1.0-c;
249
250                 int x2=x+1,y2=y+1,t2=t+1;
251
252                 return
253                         (*this)(subseed,x,y,t)*(d*e*f)+
254                         (*this)(subseed,x2,y,t)*(a*e*f)+
255                         (*this)(subseed,x,y2,t)*(d*b*f)+
256                         (*this)(subseed,x2,y2,t)*(a*b*f)+
257                         (*this)(subseed,x,y,t2)*(d*e*c)+
258                         (*this)(subseed,x2,y,t2)*(a*e*c)+
259                         (*this)(subseed,x,y2,t2)*(d*b*c)+
260                         (*this)(subseed,x2,y2,t2)*(a*b*c);
261         }
262         case 1: // Linear
263         if((float)t==tf)
264         {
265                 int x((int)floor(xf));
266                 int y((int)floor(yf));
267                 float a=xf-x;
268                 float b=yf-y;
269                 float c=1.0-a;
270                 float d=1.0-b;
271                 int x2=x+1,y2=y+1;
272                 return
273                         (*this)(subseed,x,y,t)*(c*d)+
274                         (*this)(subseed,x2,y,t)*(a*d)+
275                         (*this)(subseed,x,y2,t)*(c*b)+
276                         (*this)(subseed,x2,y2,t)*(a*b);
277         }
278         else
279         {
280
281                 float a=xf-x;
282                 float b=yf-y;
283                 float c=tf-t;
284
285                 float d=1.0-a;
286                 float e=1.0-b;
287                 float f=1.0-c;
288
289                 int x2=x+1,y2=y+1,t2=t+1;
290
291                 return
292                         (*this)(subseed,x,y,t)*(d*e*f)+
293                         (*this)(subseed,x2,y,t)*(a*e*f)+
294                         (*this)(subseed,x,y2,t)*(d*b*f)+
295                         (*this)(subseed,x2,y2,t)*(a*b*f)+
296                         (*this)(subseed,x,y,t2)*(d*e*c)+
297                         (*this)(subseed,x2,y,t2)*(a*e*c)+
298                         (*this)(subseed,x,y2,t2)*(d*b*c)+
299                         (*this)(subseed,x2,y2,t2)*(a*b*c);
300         }
301         default:
302         case 0:
303                 return (*this)(subseed,x,y,t);
304         }
305 }