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finetuning of the Win32 simulator

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This commit is contained in:
Christian Kroll 2013-11-23 19:29:13 +01:00
parent 266b599cfd
commit 615387ce31
1 changed files with 81 additions and 71 deletions
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88
simulator/winmain.c
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@ -50,23 +50,24 @@
/** Height of the canvas. */
#define WND_Y_EXTENTS (NUM_ROWS * LED_EXTENT)
/* string constants */
LPCSTR g_strWindowClass = "BorgSimulatorWindowClass";
LPCSTR g_strWindowTitle = "Borg Simulator";
LPCSTR g_strError = "Error";
LPCSTR g_strErrorRegisterWindow = "Could not register window class.";
LPCSTR g_strErrorCreateWindow = "Could not create window.";
LPCSTR g_strErrorCreateEvent = "Could not create wait event.";
LPCSTR g_strErrorCreateThread = "Could not create display loop thread.";
LPCSTR g_strErrorCreateUITimer = "Could not create UI Timer.";
LPCSTR g_strErr = "Error";
LPCSTR g_strErrTimerResolution = "Could not retrieve minimum timer resolution.";
LPCSTR g_strErrRegisterWindow = "Could not register window class.";
LPCSTR g_strErrCreateWindow = "Could not create window.";
LPCSTR g_strErrCreateEvent = "Could not create wait event.";
LPCSTR g_strErrCreateThread = "Could not create display loop thread.";
LPCSTR g_strErrCreateUITimer = "Could not create UI Timer.";
/** Minimum timer resolution the system is capable of. */
UINT g_uResolution;
/** Event object for the multimedia timer (wait() function). */
HANDLE g_hWaitEvent;
/** Fake port for simulating joystick input. */
volatile unsigned char fakeport;
/** Flag which indicates if wait should jump to the menu if fire is pressed. */
@ -82,7 +83,6 @@ LRESULT CALLBACK simWndProc(HWND hWnd,
WPARAM wParam,
LPARAM lParam);
/**
* Creates a new window and makes it visible.
* @param hInstance Handle of the instance where this window should belong to.
@ -133,13 +133,12 @@ HWND simCreateWindow(HINSTANCE hInstance,
}
else
{
fprintf(stderr, g_strErrorRegisterWindow);
fprintf(stderr, g_strErrRegisterWindow);
}
return hWnd;
}
/**
* Closes windows and unregisters its associated window class.
* @param lphWnd Pointer to window handle.
@ -152,7 +151,6 @@ void simDestroyWindow(HWND hWnd,
UnregisterClassA(g_strWindowClass, hInstance);
}
/**
* Draws the LED matrix on the given device context.
* @param hdc The device context where the LED matrix should be drawn on.
@ -216,7 +214,6 @@ void simDrawMatrix(HDC hdc)
}
}
/**
* Retrieves device context from given window, creates a compatible memory
* device context for double buffering and hands that thing over to
@ -411,7 +408,6 @@ LRESULT CALLBACK simWndProc(HWND hWnd,
return lResult;
}
/**
* Entry point for starting the the display loop in a thread.
* @param lpParam Free style arguments for the thread function (not used here).
@ -423,19 +419,36 @@ DWORD WINAPI simLoop(LPVOID lpParam)
return 0;
}
/**
* Retrieves and enforces the minimum timer resolution of the current system.
* @return Result of the multimedia timer operations.
*/
MMRESULT simSetMinimumTimerResolution()
{
TIMECAPS tc;
MMRESULT mmresult;
mmresult = timeGetDevCaps(&tc, sizeof(tc));
if (mmresult == TIMERR_NOERROR)
{
/* retrieve best resolution and configure timer services accordingly */
g_uResolution = min(max(tc.wPeriodMin, 0), tc.wPeriodMax);
mmresult = timeBeginPeriod(g_uResolution);
}
return mmresult;
}
/**
* Wait function which utilizes multimedia timers and thread synchronization
* objects. Although this is much more complicated than calling the Sleep()
* function, it is also much more precise.
* @param ms The requested delay in milliseconds.
* @param uResolution The minimum timer resolution the system is capable of.
*/
void wait(int ms)
{
TIMECAPS tc;
MMRESULT mmresult;
MMRESULT mmTimerEventId;
UINT uResolution;
/* check if fire button is pressed (and if it is, jump to the menu) */
if (waitForFire)
@ -446,17 +459,8 @@ void wait(int ms)
}
}
/* retrieve timer resolution capabilities of the current system */
mmresult = timeGetDevCaps(&tc, sizeof(tc));
if (mmresult == TIMERR_NOERROR)
{
/* retrieve best resolution and configure timer services accordingly */
uResolution = min(max(tc.wPeriodMin, 0), tc.wPeriodMax);
mmresult = timeBeginPeriod(uResolution);
if (mmresult == TIMERR_NOERROR)
{
/* actually retrieve a multimedia timer */
mmTimerEventId = timeSetEvent(ms, uResolution, g_hWaitEvent, 0,
/* retrieve a multimedia timer */
mmTimerEventId = timeSetEvent(ms, g_uResolution, g_hWaitEvent, 0,
TIME_ONESHOT | TIME_CALLBACK_EVENT_SET);
if (mmTimerEventId != 0)
{
@ -467,13 +471,7 @@ void wait(int ms)
/* relieve the timer from its duties */
timeKillEvent(mmTimerEventId);
}
/* relax timer service constraints */
timeEndPeriod (uResolution);
}
}
}
/**
* Main function of the windows simulator.
@ -495,6 +493,9 @@ int APIENTRY WinMain(HINSTANCE hInstance,
int nExitCode = 0;
if ((hWnd = simCreateWindow(hInstance, nCmdShow)) != NULL)
{
/* retrieve minimum timer resolution */
if (simSetMinimumTimerResolution() == TIMERR_NOERROR)
{
/* event handle for multimedia timer (for the wait() function) */
g_hWaitEvent = CreateEventA(NULL, TRUE, FALSE, "Local\\WaitEvent");
@ -504,7 +505,8 @@ int APIENTRY WinMain(HINSTANCE hInstance,
hLoopThread = CreateThread(NULL, 0, simLoop, NULL, 0, NULL);
if (hLoopThread != NULL)
{
SetThreadPriority(hLoopThread, THREAD_PRIORITY_TIME_CRITICAL);
SetThreadPriority(hLoopThread,
THREAD_PRIORITY_TIME_CRITICAL);
/* issue a UI timer message every 40 ms (roughly 25 fps) */
uTimerId = SetTimer(hWnd, 23, 40, NULL);
@ -522,14 +524,14 @@ int APIENTRY WinMain(HINSTANCE hInstance,
}
else
{
fprintf(stderr, g_strErrorCreateUITimer);
fprintf(stderr, g_strErrCreateUITimer);
}
TerminateThread(hLoopThread, 0);
}
else
{
fprintf(stderr, g_strErrorCreateThread);
fprintf(stderr, g_strErrCreateThread);
}
/* relieve wait event object from its duties */
@ -537,14 +539,22 @@ int APIENTRY WinMain(HINSTANCE hInstance,
}
else
{
fprintf(stderr, g_strErrorCreateEvent);
fprintf(stderr, g_strErrCreateEvent);
}
/* relieve timer resolution constraints */
timeEndPeriod(g_uResolution);
}
else
{
fprintf(stderr, g_strErrTimerResolution);
}
simDestroyWindow(hWnd, hInstance);
}
else
{
fprintf(stderr, g_strErrorCreateWindow);
fprintf(stderr, g_strErrCreateWindow);
}
return nExitCode;