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This commit is contained in:
Andrea Odetti 2020-11-12 19:31:35 +00:00
parent 892c6e383f
commit b360d27f22
3 changed files with 27 additions and 7 deletions
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31
source/frontends/sa2/emulator.cpp
View file

@ -182,21 +182,38 @@ Emulator::Emulator(
, myFPS(getFPS())
, myMultiplier(1)
, myFullscreen(false)
, myExtraCycles(0)
{
}
void Emulator::executeOneFrame()
{
const DWORD uCyclesToExecute = int(g_fCurrentCLK6502 / myFPS);
const UINT dwClksPerFrame = NTSC_GetCyclesPerFrame();
const bool bVideoUpdate = true;
const DWORD uActualCyclesExecuted = CpuExecute(uCyclesToExecute, bVideoUpdate);
g_dwCyclesThisFrame = (g_dwCyclesThisFrame + uActualCyclesExecuted) % dwClksPerFrame;
const int nExecutionPeriodUsec = 1000; // 1.0ms
const double fUsecPerSec = 1.e6;
const double fExecutionPeriodClks = int(g_fCurrentCLK6502 * (nExecutionPeriodUsec / fUsecPerSec));
GetCardMgr().GetDisk2CardMgr().UpdateDriveState(uActualCyclesExecuted);
MB_PeriodicUpdate(uActualCyclesExecuted);
SpkrUpdate(uActualCyclesExecuted);
int totalCyclesExecuted = 0;
const DWORD uCyclesToExecute = int(g_fCurrentCLK6502 / myFPS) + myExtraCycles;
const UINT dwClksPerFrame = NTSC_GetCyclesPerFrame();
while (totalCyclesExecuted < uCyclesToExecute)
{
// go in small steps of 1ms
const DWORD uActualCyclesExecuted = CpuExecute(fExecutionPeriodClks, bVideoUpdate);
totalCyclesExecuted += uActualCyclesExecuted;
g_dwCyclesThisFrame = (g_dwCyclesThisFrame + uActualCyclesExecuted) % dwClksPerFrame;
GetCardMgr().GetDisk2CardMgr().UpdateDriveState(uActualCyclesExecuted);
MB_PeriodicUpdate(uActualCyclesExecuted);
SpkrUpdate(uActualCyclesExecuted);
}
myExtraCycles = uCyclesToExecute - totalCyclesExecuted;
}
void Emulator::refreshVideo()
{
// SDL2 seems to synch with screen refresh rate so we do not need to worry about timers
const SDL_Rect srect = refreshTexture(myTexture);
renderScreen(myRenderer, myTexture, srect);

2
source/frontends/sa2/emulator.h
View file

@ -13,6 +13,7 @@ public:
);
void executeOneFrame();
void refreshVideo();
void processEvents(bool & quit);
private:
@ -27,4 +28,5 @@ private:
int myMultiplier;
bool myFullscreen;
int myExtraCycles;
};

1
source/frontends/sa2/main.cpp
View file

@ -216,6 +216,7 @@ void run_sdl(int argc, const char * argv [])
SDirectSound::writeAudio();
emulator.processEvents(quit);
emulator.executeOneFrame();
emulator.refreshVideo();
} while (!quit);
SDirectSound::stop();