From 36eb8bc7c24938163bcf8d7b3a58bfeb71755f8d Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 7 Apr 2018 10:05:36 +0200
Subject: Support configurable solving at finer levels.

---
 param.ccl |  5 +++++
 src/qms.c | 25 +++++++++++++++++++++----
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/param.ccl b/param.ccl
index 35fa495..9d877b1 100644
--- a/param.ccl
+++ b/param.ccl
@@ -31,6 +31,11 @@ CCTK_REAL outer_bound "" STEERABLE=recover
     0: :: ""
 } 64.0
 
+CCTK_INT solve_level "" STEERABLE=recover
+{
+    0: :: ""
+} 0
+
 CCTK_REAL switchoff_time "" STEERABLE=recover
 {
    0: :: ""
diff --git a/src/qms.c b/src/qms.c
index 6faa62e..3d3fb64 100644
--- a/src/qms.c
+++ b/src/qms.c
@@ -51,7 +51,6 @@ struct QMSContext {
     double *coeffs_eval;
 
     double max_radius;
-    int solve_level;
 
     uint64_t grid_expand_count;
     uint64_t grid_expand_time;
@@ -62,6 +61,21 @@ struct QMSContext {
 
 double scale_factor;
 
+static int ctz(int a)
+{
+    int ret = 0;
+
+    if (!a)
+        return INT_MAX;
+
+    while (!(a & 1)) {
+        a >>= 1;
+        ret++;
+    }
+
+    return ret;
+}
+
 /* get an approximate "main" frequency component in a basis function */
 static double calc_basis_freq(const BasisSet *b, int order)
 {
@@ -282,12 +296,15 @@ void quasimaximal_slicing_axi_solve(CCTK_ARGUMENTS)
 
     ms = qms_context;
 
-    time = cctkGH->cctk_time / ms->gh->cctk_delta_time;
-
     if (cctkGH->cctk_time >= switchoff_time + 1.0)
         return;
 
-    if (ms->gh->cctk_levfac[0] != 1 || fabs(time - ceilf(time)) > 1e-8 ||
+    if (ctz(ms->gh->cctk_levfac[0]) != solve_level)
+        return;
+
+    time = cctkGH->cctk_time * ms->gh->cctk_levfac[0] / ms->gh->cctk_delta_time;
+
+    if (fabs(time - ceilf(time)) > 1e-8 ||
         (ms->solutions[ARRAY_ELEMS(ms->solutions) - 1].time >= cctkGH->cctk_time))
         return;
 
-- 
cgit v1.2.3