zdoom/gzdoom
0
0
Fork 0
mirror of https://github.com/ZDoom/gzdoom.git synced 2025-05-31 01:01:44 +00:00
Code Issues Projects Releases Packages Wiki Activity

- Replaced toint/quickertoint with the portable routines from xs_Float.h. The

Browse source 
former used fistp, which is not portable across platforms, so cannot be
  used in the play simulation. They were only suitable for the renderer.
  xs_Float.h also has a very fast float->fixed conversion, so FLOAT2FIXED
  uses that now.
  (And I also learned that the FPU's round to nearest is not the rounding I
  learned in grade school but actually Banker's Rounding. I had no idea.)
  (Also, also, the only thing that could have made quickertoint faster than
  toint was that it stored a 32-bit int. I never timed them, and I doubt in
  practice there was any real difference between the two.)
- Changed atan2f to atan2. Using floats is not a win, because the result is
  returned as a double on the x87 stack, which the caller then needs to cast
  down to a float using fst/fld.

SVN r1990 (trunk)
This commit is contained in:
Randy Heit 2009-11-20 05:34:20 +00:00
parent eca9b4981b
commit 344dda4a1a
13 changed files with 56 additions and 83 deletions
Download patch file Download diff file Expand all files Collapse all files

12
docs/rh-log.txt
View file

@ -1,3 +1,15 @@
November 19, 2009
- Replaced toint/quickertoint with the portable routines from xs_Float.h. The
former used fistp, which is not portable across platforms, so cannot be
used in the play simulation. They were only suitable for the renderer.
xs_Float.h also has a very fast float->fixed conversion, so FLOAT2FIXED
uses that now.
(And I also learned that the FPU's round to nearest is not the rounding I
learned in grade school but actually Banker's Rounding. I had no idea.)
(Also, also, the only thing that could have made quickertoint faster than
toint was that it stored a 32-bit int. I never timed them, and I doubt in
practice there was any real difference between the two.)
November 18, 2009
- Added padding around packed textures to compensate for apparent NVidia
texture coordinate imprecision.