From ccddec68116fc6403858ebfa13d4a7b1aa3d5278 Mon Sep 17 00:00:00 2001
From: "N.N." <matju@users.sourceforge.net>
Date: Sun, 18 Oct 2009 20:01:19 +0000
Subject: hi gridflow 0.9.5

svn path=/trunk/; revision=12611
---
 externals/gridflow/optional/fftw.c | 114 +++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 externals/gridflow/optional/fftw.c

(limited to 'externals/gridflow/optional/fftw.c')

diff --git a/externals/gridflow/optional/fftw.c b/externals/gridflow/optional/fftw.c
new file mode 100644
index 00000000..f4337f16
--- /dev/null
+++ b/externals/gridflow/optional/fftw.c
@@ -0,0 +1,114 @@
+/*
+	GridFlow
+	Copyright (c) 2001-2008 by Mathieu Bouchard
+
+	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.
+
+	See file ../COPYING for further informations on licensing terms.
+
+	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.
+*/
+
+#include "../gridflow.h.fcs"
+#include <fftw3.h>
+
+#define C(x) ((fftwf_complex *)x)
+
+\class GridFFT : FObject {
+	fftwf_plan plan;
+	P<Dim> lastdim; /* of last input (for plan cache) */
+	long lastchans; /* of last input (for plan cache) */
+	\attr int sign; /* -1 or +1 */
+	\attr int skip; /* 0 (y and x) or 1 (x only) */
+	\attr bool real;
+	bool lastreal;
+	\constructor () {sign=-1; plan=0; lastdim=0; lastchans=0; skip=0; real=false;}
+	\grin 0 float32
+};
+\def 0 sign (int sign) {
+	if (sign!=-1 && sign!=1) RAISE("sign should be -1 or +1");
+	this->sign=sign;
+	fftwf_destroy_plan(plan);
+}
+\def 0 skip (int skip) {
+	if (skip<0 || skip>1) RAISE("skip should be 0 or 1");
+	this->skip=skip;
+	if (plan) {fftwf_destroy_plan(plan); plan=0;}
+}
+GRID_INLET(0) {
+	if (in->nt != float32_e)                  RAISE("expecting float32");
+	if (real && sign==-1) {
+	  if (in->dim->n != 2 && in->dim->n != 3) RAISE("expecting 2 or 3 dimensions: rows,columns,channels?");
+	} else {
+	  if (in->dim->n != 3 && in->dim->n != 4) RAISE("expecting 3 or 4 dimensions: rows,columns,channels?,complex");
+	  if (in->dim->get(in->dim->n-1)!=2)      RAISE("expecting Dim(...,2): real,imaginary (got %d)",in->dim->get(2));
+	}
+	in->set_chunk(0);
+} GRID_FLOW {
+	if (skip==1 && !real) RAISE("can't do 1-D FFT in real mode, sorry");
+	Dim *dim;
+	if (!real) dim = in->dim;
+	else if (sign==-1) {
+		int v[Dim::MAX_DIM];
+		for (int i=0; i<in->dim->n; i++) v[i]=in->dim->v[i];
+		v[in->dim->n] = 2;
+		dim = new Dim(in->dim->n+1,v);
+	} else dim = new Dim(in->dim->n-1,in->dim->v);
+	GridOutlet out(this,0,dim,in->nt);
+	float32 *tada = (float32 *)memalign(16,dim->prod()*sizeof(float32));
+	long chans = in->dim->n>=3 ? in->dim->get(2) : 1;
+	CHECK_ALIGN16(data,in->nt)
+	CHECK_ALIGN16(tada,in->nt)
+	if (plan && lastdim && lastdim!=in->dim && chans!=lastchans && real==lastreal) {fftwf_destroy_plan(plan); plan=0;}
+	int v[] = {in->dim->v[0],in->dim->v[1],in->dim->n>2?in->dim->v[2]:1};
+//	if (chans==1) {
+//		if (skip==0) plan = fftwf_plan_dft_2d(v[0],v[1],data,tada,sign,0);
+//		if (skip==1) plan = fftwf_plan_many_dft(1,&v[1],v[0],data,0,1,v[1],tada,0,1,v[1],sign,0);
+//	}
+	if (skip==0) {
+		//plan = fftwf_plan_dft_2d(v[0],v[1],data,tada,sign,0);
+		if (!plan) {
+			int embed[] = {dim->v[0],dim->v[1]};
+			if (!real)         {plan=fftwf_plan_many_dft(    2,&v[0],chans,C(data),0    ,chans,1,C(tada),0    ,chans,1,sign,0);}
+			else if (sign==-1) {plan=fftwf_plan_many_dft_r2c(2,&v[0],chans,  data ,embed,chans,1,C(tada),embed,chans,1,0);}
+			else               {plan=fftwf_plan_many_dft_c2r(2,&v[0],chans,C(data),embed,chans,1,  tada ,embed,chans,1,0);}
+		}
+		if (!real)         fftwf_execute_dft(    plan,C(data),C(tada));
+		else if (sign==-1) fftwf_execute_dft_r2c(plan,  data ,C(tada));
+		else               fftwf_execute_dft_c2r(plan,C(data),  tada );
+	}
+	if (skip==1) {
+		if (!plan) plan=fftwf_plan_many_dft(1,&v[1],chans,C(data),0,chans,1,C(tada),0,chans,1,sign,0);
+		//plan = fftwf_plan_many_dft(1,&v[1],v[0],C(data),0,1,v[1],C(tada),0,1,v[1],sign,0);
+		long incr = v[1]*chans;
+		for (int i=0; i<v[0]; i++) fftwf_execute_dft(plan,C(data)+i*incr,C(tada)+i*incr);
+	}
+	if (real && sign==-1) {
+		for (int i=0; i<v[0]; i++) {
+			int h = mod(-i,v[0]);
+			T *tada2 = tada + (h*v[1]+v[1]/2)*v[2]*2;
+			T *tada3 = tada + (i*v[1]+v[1]/2)*v[2]*2;
+			for (int j=1+v[1]/2; j<v[1]; j++) {
+				tada2-=v[2]*2; tada3+=v[2]*2;
+				for (int k=0; k<v[2]; k++) {tada3[k+k]=tada2[k+k]; tada3[k+k+1]=-tada2[k+k+1];}
+			}
+		}
+	}
+	out.send(out.dim->prod(),tada);
+	free(tada);
+	lastdim=in->dim; lastchans=chans; lastreal=real;
+} GRID_END
+\end class {install("#fft",1,1);}
+void startup_fftw () {
+	\startall
+}
-- 
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