Mercurial > sdl-ios-xcode
annotate TODO @ 2752:edd2839b36f7
http://sources.redhat.com/ml/newlib/2002/msg00230.html
Stephen L Moshier wrote:
>
> pow(x,y) returns 0 when x is very close to -1.0 and y is very large.
> The following test program prints
>
> pow(1.0000000000000002e+00 4.5035996273704970e+15) = 2.7182818284590455e+00
> pow(-1.0000000000000002e+00 4.5035996273704970e+15) =0.0000000000000000e+00
> pow(9.9999999999999978e-01 4.5035996273704970e+15) = 3.6787944117144222e-01
> pow(-9.9999999999999978e-01 4.5035996273704970e+15) = 0.0000000000000000e+00
>
> which is incorrect for the negative arguments raised to an odd integer
> power.
>
> -----
> double pow (double, double);
>
> int
> main ()
> {
> double x, y, z;
>
> x = 1.0 + pow (2.0, -52.0);
> y = 1.0 + pow (2.0, 52.0);
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = -x;
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = 1.0 - pow (2.0, -52.0);
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = -x;
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> }
> -----
>
> Here is a patch for newlib/libm/math/epow.c:
Patch checked in and duplicated for ef_pow.c. Thanks.
-- Jeff J.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 15 Sep 2008 04:31:30 +0000 |
| parents | 3458c74b5fab |
| children | 6f260584df22 |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 Wish list for the 1.3 development branch: | |
|
1534
f02e673ffc5f
*** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
1441
diff
changeset
|
3 http://bugzilla.libsdl.org/ |
| 0 | 4 |
|
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1621
diff
changeset
|
5 * Add a way to register custom events |
|
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1621
diff
changeset
|
6 * Add internal support for adding video modes and refresh rates |
|
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1621
diff
changeset
|
7 * Support querying and setting refresh rate with video modes |
| 0 | 8 * Add mousewheel events (new unified event architecture?) |
| 9 * DirectInput joystick support needs to be implemented | |
| 10 * Be able to enumerate and select available audio and video drivers | |
| 1621 | 11 * Fullscreen video mode support for Mac OS X |
| 0 | 12 * Explicit vertical retrace wait (maybe separate from SDL_Flip?) |
| 13 * Shaped windows, windows without borders | |
| 14 * Multiple windows, multiple display support | |
| 15 * SDL_INIT_EVENTTHREAD on Windows and MacOS? | |
| 16 * Add a timestamp to events | |
| 17 * Add audio input API | |
|
2
836aaee3f39e
*** empty log message ***
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
18 * Add hardware accelerated scaled blit |
|
836aaee3f39e
*** empty log message ***
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
19 * Add hardware accelerated alpha blits |
|
836aaee3f39e
*** empty log message ***
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
20 * Redesign blitting architecture to allow blit plugins |
|
2330
3458c74b5fab
So we don't forget to do this...
Sam Lantinga <slouken@libsdl.org>
parents:
1895
diff
changeset
|
21 * Add modifier state to key and button events |
| 0 | 22 |
| 23 In the jump from 1.2 to 1.3, we should change the SDL_Rect members to | |
| 24 int and evaluate all the rest of the datatypes. This is the only place | |
| 25 we should do it though, since the 1.2 series should not break binary | |
| 26 compatibility in this way. | |
| 150 | 27 |
| 28 Requests: | |
| 29 * PCM and CDROM volume control (deprecated, but possible) |