Re: [AL] RE: [AL] someway to get current drawing mode and its parameters?

[Peter W. <tj...@al...>]

On 2002-07-09, Vincent <Vin...@ar...> wrote:
> However, I am uncomfortable saving these in an auto buffer.
> If we do:
> 
> AL_GFX_STATE state;
> al_save_state(flags, &state);
> al_restore_state(&state);
> 
> Then the stack is going to take quite a lot of data. It would
> require the following, which would then keep track of the flags
> and only allocate what's necessary for what was requested:
> 
> AL_GFX_STATE *state;
> state=al_save_state(flags);
> al_restore_state(state); /* deletes state ? */

- Allocing is a bit slower than not;
- Allocing can fail, so strictly speaking you need to check the return
  value;
- You need to separate the restore and delete functions, otherwise you
  cannot save the state and not restore it later.

So a dynamic-allocation interface looks like it will require four
functions (create, destroy, save, restore) and error checking.  I don't
really want that.

PS. I thought of something useful that could be done with AL_GFX_STATEs.
For a window system, you could restore the previous state before calling
a window's update hook, then save the state afterwards.  That way the
update hook can depend on the graphics state being unchanged from the
last time it was called.

-- 
王浩禎
>From <all...@ca...> Thu Jul 11 03:10:52 2002
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From: "Jussi Nieminen" <ju...@ho...>
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Subject: Re: [AL] QueryPerformanceCounter or similar with Allegro?
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>From: Jason Winnebeck <gi...@ma...>
>Subject: Re: [AL] QueryPerformanceCounter or similar with Allegro?
>Date: Wed, 10 Jul 2002 08:30:09 -0400
>
>Use that code in Windows, and use an #ifdef to use gettimeofday in UNIX.
>
>Jussi Nieminen wrote:
>>
>>Is it possible to asquire a high frequency timer that tels the time since 
>>the program has started?
>>How to do this in Allegro? Crossplatform is not mandatory but it would be 
>>nice.

Hey!

How can I use the Windows functions in allegro?

If I put the #include <windows.h> directive to the code I get conflicts from 
the BITMAP structure as: "conflicting types for `typedef struct tagBITMAP 
BITMAP".

If I don't put the #include <windows.h> in the code I get error that tells 
"implicit declaration of function `int QueryPerformanceFrequency(...)".

How to solve this?

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