Signed-off-by: Qiang Yu <yuq...@gmail.com>
---
src/util/u_math.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/src/util/u_math.h b/src/util/u_math.h
index e7dbbe5ca22..ffadfb47282 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)
+{
+ union fi tmp;
+
+ tmp.f = f;
+ if (tmp.i < 0) {
+ return (ushort) 0;
+ }
+ else if (tmp.i >= 0x3f800000 /* 1.0f */) {
+ return (ushort) 65535;
+ }
+ else {
+ tmp.f = tmp.f * (65535.0f/65536.0f) + 128.0f;
+ return (ushort) tmp.i;
+ }
+}
+
static inline float
byte_to_float_tex(int8_t b)
{
--
2.17.1
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