b3d: add support for positive nan

2024-07-15 12:19:31 +02:00 · 2021-03-03 18:31:38 +01:00 · 2021-03-03 18:31:38 +01:00 · 8c97425fbc
commit 8c97425fbc
parent ca6757f326
1 changed files with 3 additions and 2 deletions
--- a/b3d.lua
+++ b/b3d.lua
@ -63,8 +63,9 @@ function read(stream)
            if mantissa == 0 then
                return sign * math.huge
            end
-            -- TODO differentiate quiet and signalling NaN as well as positive and negative
-            return 0/0
+            -- Differentiating quiet and signalling nan is not possible in Lua, hence we don't have to do it
+            -- HACK ((0/0)^1) yields nan, 0/0 yields -nan
+            return sign == 1 and ((0/0)^1) or 0/0
        end
        if exponent == 0 then
            -- subnormal value