Add llLinear2sRGB / llsRGB2Linear implementations

lslopt/lslbasefuncs.py

@@ -1236,6 +1236,14 @@ def llIntegerToBase64(x):
     return b64encode(chr((x>>24)&255) + chr((x>>16)&255) + chr((x>>8)&255)
                      + chr(x&255)).decode('utf8')
 
+def llLinear2sRGB(v):
+    v = v2f(v)
+    return F32(Vector(
+        12.920000076293945 * x if x <= 0.0031308000907301903 else
+        F32(1.0549999475479126 * F32(x ** 0.4166666567325592))
+            - 0.054999999701976776
+        for x in v))
+
 def llList2CSV(lst):
     lst = fl(lst)
     ret = []
@@ -1771,6 +1779,14 @@ def llSqrt(f):
     # LSL and Python both produce -0.0 when the input is -0.0.
     return F32(math.sqrt(f))
 
+def llsRGB2Linear(v):
+    v = v2f(v)
+    return F32(Vector(
+        x / 12.920000076293945 if x <= 0.040449999272823334 else
+        F32(F32(x + 0.054999999701976776) / 1.0549999475479126)
+            ** 2.4000000953674316
+        for x in v))
+
 def llStringLength(s):
     s = fs(s)
     return len(s)

unit_tests/expr.suite/math-funcs.lsl

@@ -64,4 +64,8 @@
 , llVecDist(<0,0,0>, <0,0,0>)
 , llVecDist(<0,0,0>, <48,-60,-64>)
 , llVecDist(<-30,30,30>, <18,-30,-34>)
+, llLinear2sRGB(<0.002, 0.14875476, 0.047648344>)*16777216
+, llLinear2sRGB(<0.98946905, 0.6663575, 0.018204538>)*16777216
+, llsRGB2Linear(<0.002, 0.16214077, 0.28536963>)*16777216
+, llsRGB2Linear(<0.80262023, 0.6663575, 0.018204538>)*16777216
 ]

unit_tests/expr.suite/math-funcs.out

@@ -64,4 +64,8 @@
 , 0.
 , 100.
 , 100.
+, <433523.28, 7078700., 4056445.5>
+, <16699309., 14022980., 2411880.>
+, <2597.0922, 377653.25, 1110698.>
+, <10205213., 6737136.5, 23639.431>
 ]