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authornsz <nsz@port70.net>2012-03-27 22:17:36 +0200
committernsz <nsz@port70.net>2012-03-27 22:17:36 +0200
commitbbfbc7edaf992abe1d3d09868be07c4c1cc44db7 (patch)
treedd101f1fad64e09dd18cc7ceb71bcb0804f9aae7 /src
parent1b229a2098a35795aa20bd09b8c81c5143e64277 (diff)
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math: add dummy tgamma and tgammaf implementations
Diffstat (limited to 'src')
-rw-r--r--src/math/tgamma.c16
-rw-r--r--src/math/tgammaf.c16
2 files changed, 32 insertions, 0 deletions
diff --git a/src/math/tgamma.c b/src/math/tgamma.c
new file mode 100644
index 00000000..f3bbe370
--- /dev/null
+++ b/src/math/tgamma.c
@@ -0,0 +1,16 @@
+#include <math.h>
+
+// FIXME: use lanczos approximation
+
+double __lgamma_r(double, int *);
+
+double tgamma(double x)
+{
+	int sign;
+	double y;
+
+	y = exp(__lgamma_r(x, &sign));
+	if (sign < 0)
+		y = -y;
+	return y;
+}
diff --git a/src/math/tgammaf.c b/src/math/tgammaf.c
new file mode 100644
index 00000000..16df8076
--- /dev/null
+++ b/src/math/tgammaf.c
@@ -0,0 +1,16 @@
+#include <math.h>
+
+// FIXME: use lanczos approximation
+
+float __lgammaf_r(float, int *);
+
+float tgammaf(float x)
+{
+	int sign;
+	float y;
+
+	y = exp(__lgammaf_r(x, &sign));
+	if (sign < 0)
+		y = -y;
+	return y;
+}