Re: SDL2 Wrapper Not Working Under 4.1.0
- Posted by ghaberek (admin) Sep 15, 2014
- 2232 views
Icy_Viking said...
Is there something wrong with my flag values?
public constant SDL_INIT_TIMER = 1, SDL_INIT_AUDIO = 16, SDL_INIT_VIDEO = 32, SDL_INIT_JOYSTICK = 512, SDL_INIT_HAPTIC = 4096, SDL_INIT_GAMECONTROLLER = 8192, SDL_INIT_EVENTS = 16384, SDL_INIT_NOPARACHUTE = 1048576, SDL_INIT_EVERYTHING = SDL_INIT_TIMER and SDL_INIT_AUDIO and SDL_INIT_VIDEO and SDL_INIT_EVENTS and SDL_INIT_JOYSTICK and SDL_INIT_HAPTIC and SDL_INIT_GAMECONTROLLER
Yes. I can see right here that you've got a problem.
The keywords and and or are logical or boolean (true/false) operators not bitwise (flags/math) operations. You'll need to use the library function or_all() to combine flags.
include std/math.e public constant SDL_INIT_TIMER = 1, SDL_INIT_AUDIO = 16, SDL_INIT_VIDEO = 32, SDL_INIT_JOYSTICK = 512, SDL_INIT_HAPTIC = 4096, SDL_INIT_GAMECONTROLLER = 8192, SDL_INIT_EVENTS = 16384, SDL_INIT_NOPARACHUTE = 1048576, SDL_INIT_EVERYTHING = or_all({ SDL_INIT_TIMER, SDL_INIT_AUDIO, SDL_INIT_VIDEO, SDL_INIT_EVENTS, SDL_INIT_JOYSTICK, SDL_INIT_HAPTIC, SDL_INIT_GAMECONTROLLER })
If you're translating Euphoria constants from C macros, you'll need to be aware of the difference between boolean and bitwise operations.
| operation | C | Euphoria |
|---|---|---|
| bitwise AND | & | and_bits() function |
| bitwise OR | | | or_bits() or or_all() function |
| bitwise XOR | ^ | xor_bits() function |
| bitwise NOT | ~ | not_bits() function |
| boolean AND | && | and keyword |
| boolean OR | || | or keyword |
| boolean NOT | ! | not keyword |
Hope this helps.
-Greg
P.S. If you have a lot of code to share, try using Pastey (link on the right of this page under Misc Menu) instead of dumping it all into the discussion directly.
