From d9ef78ae11efaf88bcf2b964778890108084193b Mon Sep 17 00:00:00 2001
From: Vito Caputo <vcaputo@pengaru.com>
Date: Sat, 25 Jan 2020 21:43:07 -0800
Subject: modules/flui2d: derive r from ticks
Modulo ticks by 2*M_PI to preserve precision by constraining the float
to 2*M_PI radians.
---
src/modules/flui2d/flui2d.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/modules/flui2d/flui2d.c b/src/modules/flui2d/flui2d.c
index 62dbbec..71238cd 100644
--- a/src/modules/flui2d/flui2d.c
+++ b/src/modules/flui2d/flui2d.c
@@ -218,8 +218,8 @@ static int flui2d_fragmenter(void *context, const fb_fragment_t *fragment, unsig
static void flui2d_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter)
{
flui2d_context_t *ctxt = context;
- static float r;
- int x = (cos(r += .01f) * .4f + .5f) * (float)ROOT; /* figure eight pattern for the added densities */
+ float r = (ticks % (unsigned)(2 * M_PI * 1000)) * .001f;
+ int x = (cos(r) * .4f + .5f) * (float)ROOT; /* figure eight pattern for the added densities */
int y = (sin(r * 2.f) * .4f + .5f) * (float)ROOT;
*res_fragmenter = flui2d_fragmenter;
--
cgit v1.2.3