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-rw-r--r--src/util/u_math.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/src/util/u_math.h b/src/util/u_math.h
index e7dbbe5ca22..5e712dadb4a 100644
--- a/src/util/u_math.h
+++ b/src/util/u_math.h
@@ -389,6 +389,37 @@ float_to_ubyte(float f)
}
}
+/**
+ * Convert ushort to float in [0, 1].
+ */
+static inline float
+ushort_to_float(ushort us)
+{
+ return (float) us * (1.0f / 65535.0f);
+}
+
+
+/**
+ * Convert float in [0,1] to ushort in [0,65535] with clamping.
+ */
+static inline ushort
+float_to_ushort(float f)
+{
+ /* return 0 for NaN too */
+ if (!(f > 0.0f)) {
+ return (ushort) 0;
+ }
+ else if (f >= 1.0f) {
+ return (ushort) 65535;
+ }
+ else {
+ union fi tmp;
+ tmp.f = f;
+ tmp.f = tmp.f * (65535.0f/65536.0f) + 128.0f;
+ return (ushort) tmp.i;
+ }
+}
+
static inline float
byte_to_float_tex(int8_t b)
{