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unit fastevents;
{
FastEvents is a high-performance event queue manager for SDL.
Copyright (C) 2002 Bob Pendleton
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1
of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA
If you do not wish to comply with the terms of the LGPL please
contact the author as other terms are available for a fee.
Bob Pendleton
Bob@Pendleton.com
}
{
Translated to Object Pascal by Mason Wheeler.
masonwheeler@yahoo.com
The original C library can be found at
http://www.gameprogrammer.com/fastevents/fastevents.zip
}
interface
uses
sdl;
function FE_Init: integer; // Initialize FE
procedure FE_Quit; // shutdown FE
procedure FE_PumpEvents; // replacement for SDL_PumpEvents
function FE_PollEvent(event: PSDL_Event): integer; // replacement for SDL_PollEvent
procedure FE_WaitEvent(event: PSDL_Event); // replacement for SDL_WaitEvent
procedure FE_PushEvent(event: PSDL_Event); // replacement for SDL_PushEvent
function FE_GetError: string; // returns the last FastEvents error
implementation
//----------------------------------------
//
// error handling code
//
var
errorString: string = '';
procedure setError(err: string); inline;
begin
errorString := err;
end;
function FE_GetError: string;
begin
result := errorString;
end;
//----------------------------------------
//
// Threads, mutexs, thread utils, and
// thread safe wrappers
//
var
eventLock: PSDL_Mutex = nil;
eventWait: PSDL_Cond = nil;
eventTimer: PSDL_TimerID = nil;
//----------------------------------------
//
// Timer callback
//
function timerCallback(interval: Uint32; param: pointer): Uint32; {$IFNDEF __GPC__} cdecl; {$ENDIF}
begin
SDL_CondBroadcast(eventWait);
result := interval;
end;
//----------------------------------------
// Initialization and
// cleanup routines
//
function FE_Init: integer;
begin
result := -1;
if (SDL_INIT_TIMER and SDL_WasInit(SDL_INIT_TIMER)) = 0 then
SDL_InitSubSystem(SDL_INIT_TIMER);
eventLock := SDL_CreateMutex();
if eventLock = nil then
begin
setError('FE: can''t create a mutex');
Exit;
end;
eventWait := SDL_CreateCond();
if eventWait = nil then
begin
setError('FE: can''t create a condition variable');
Exit;
end;
eventTimer := SDL_AddTimer(10, timerCallback, nil);
if eventTimer = nil then
begin
setError('FE: can''t add a timer');
Exit;
end;
result := 0;
end;
procedure FE_Quit;
begin
SDL_DestroyMutex(eventLock);
eventLock := nil;
SDL_DestroyCond(eventWait);
eventWait := nil;
SDL_RemoveTimer(eventTimer);
eventTimer := nil;
end;
//----------------------------------------
//
// replacement for SDL_PushEvent();
//
// This was originally an int function; I changed it to a
// procedure because it only had one possible return value: 1.
// This seemed a bit pointless. -- Mason Wheeler
//
procedure FE_PushEvent(event: PSDL_Event);
begin
SDL_LockMutex(eventLock);
while SDL_PushEvent(event) = -1 do
SDL_CondWait(eventWait, eventLock);
SDL_UnlockMutex(eventLock);
SDL_CondSignal(eventWait);
end;
//----------------------------------------
//
// replacement for SDL_PumpEvents();
//
procedure FE_PumpEvents;
begin
SDL_LockMutex(eventLock);
SDL_PumpEvents();
SDL_UnlockMutex(eventLock);
end;
//----------------------------------------
//
// replacement for SDL_PollEvent();
//
function FE_PollEvent(event: PSDL_Event): integer;
var
val: integer;
begin
SDL_LockMutex(eventLock);
val := SDL_PollEvent(event);
SDL_UnlockMutex(eventLock);
if val > 0 then
SDL_CondSignal(eventWait);
result := val;
end;
//----------------------------------------
//
// Replacement for SDL_WaitEvent();
//
// This was originally an int function; I changed it to a
// procedure because it only had one possible return value: 1.
// This seemed a bit pointless. -- Mason Wheeler
//
procedure FE_WaitEvent(event: PSDL_Event);
begin
SDL_LockMutex(eventLock);
while SDL_PollEvent(event) <= 0 do
SDL_CondWait(eventWait, eventLock);
SDL_UnlockMutex(eventLock);
SDL_CondSignal(eventWait);
end;
end.
|
