From d9c048f2028e3103212a1cfc6a29b2dc6c729387 Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <lars@6xq.net>
Date: Tue, 7 Apr 2015 18:02:59 +0200
Subject: Precalc variation constants once

No difference measureable.
---
 flam3.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

(limited to 'flam3.c')

diff --git a/flam3.c b/flam3.c
index 7d0a18d..55990d9 100644
--- a/flam3.c
+++ b/flam3.c
@@ -147,13 +147,10 @@ int flam3_create_chaos_distrib(flam3_genome *cp, int xi, unsigned short *xform_d
    
    return(0);
 }
-/*
- * run the function system described by CP forward N generations.  store
- * the N resulting 4-vectors in SAMPLES.  the initial point is passed in
- * SAMPLES[0..3].  ignore the first FUSE iterations.
- */
-
 
+/*	xform_precalc must be called once for each xform before running this
+ *	function
+ */
 int flam3_iterate(flam3_genome *cp, int n, int fuse, const double4 in, double4 *samples, const unsigned short *xform_distrib, randctx *rc) {
    int i;
    double4 p, q;
@@ -164,10 +161,6 @@ int flam3_iterate(flam3_genome *cp, int n, int fuse, const double4 in, double4 *
    
    p = in;
 
-   /* Perform precalculations */   
-   for (i=0;i<cp->num_xforms;i++)
-      xform_precalc(cp,i);
-
    for (i = -fuse; i < n; i++) {
    
 //         fn = xform_distrib[ lastxf*CHOOSE_XFORM_GRAIN + (((unsigned)irand(rc)) % CHOOSE_XFORM_GRAIN)];
@@ -1859,6 +1852,10 @@ int flam3_estimate_bounding_box(flam3_genome *cp, double eps, int nsamples,
    xform_distrib = flam3_create_xform_distrib(cp);
    if (xform_distrib==NULL)
       return(-1);
+   for (unsigned int i = 0; i < cp->num_xforms; i++) {
+	   xform_precalc (&cp->xform[i]);
+   }
+
    bv=flam3_iterate(cp, nsamples, 20, start, points, xform_distrib, rc);
    free(xform_distrib);
       
-- 
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