Vectorize color clipping

Replaces redundant code with one function. Oddly this fixes rendering
with earlyclip – not sure why. Drop transparency and channel settings
(always transparent, always four channels).

1 files changed, 61 insertions, 0 deletions

diff --git a/math.h b/math.h
new file mode 100644
index 0000000..defc7c6
--- /dev/null
+++ b/math.h
@@ -0,0 +1,61 @@
+/*
+    FLAM3 - cosmic recursive fractal flames
+    Copyright (C) 1992-2009 Spotworks LLC
+    Copyright (C) 2015 vlam3 contributors
+
+    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 3 of the License, or
+    (at your option) any later version.
+
+    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, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <math.h>
+
+#include "build/config.h"
+
+#ifdef HAVE_AMDLIBM
+#define REPLACE_WITH_AMDLIBM
+#include <amdlibm.h>
+#endif
+
+#define clamp(a,min,max) (a > max ? max : (a < min ? min : a))
+
+/*	Vector wrapping function, could be replaced by true vector functions later
+ */
+
+inline double4 clamp_d4 (const double4 in, const double min, const double max) {
+	return (double4) {
+			clamp (in[0], min, max),
+			clamp (in[1], min, max),
+			clamp (in[2], min, max),
+			clamp (in[3], min, max),
+			};
+}
+
+inline double4 pow_d4 (const double4 in, double exp) {
+	return (double4) {
+			pow (in[0], exp),
+			pow (in[1], exp),
+			pow (in[2], exp),
+			pow (in[3], exp),
+			};
+}
+
+inline double4 nearbyint_d4 (const double4 in) {
+	return (double4) {
+			nearbyint (in[0]),
+			nearbyint (in[1]),
+			nearbyint (in[2]),
+			nearbyint (in[3]),
+			};
+}