Xargon/Supermodel
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change throttle logic for smoother playback, we could get closer to 60fps if SDL timers weren't so lame

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This commit is contained in:
Ian Curtis 2016-10-21 00:04:12 +00:00
parent 2f49012786
commit 0a7c0d0864
1 changed files with 18 additions and 13 deletions
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29
Src/OSD/SDL/Main.cpp
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@ -899,6 +899,15 @@ void EndFrameVideo()
SDL_GL_SwapBuffers();
}
static void SuperSleep(UINT32 time)
{
UINT32 start = SDL_GetTicks();
UINT32 tics = start;
while (start + time > tics) {
tics = SDL_GetTicks();
}
}
/******************************************************************************
Main Program Loop
@ -913,9 +922,7 @@ int Supermodel(const char *zipFile, IEmulator *Model3, CInputs *Inputs, COutputs
{
#endif // SUPERMODEL_DEBUGGER
unsigned prevFPSTicks;
unsigned startTicks;
unsigned fpsFramesElapsed;
unsigned framesElapsed;
bool gameHasLightguns = false;
bool quit = false;
bool paused = false;
@ -990,9 +997,7 @@ int Supermodel(const char *zipFile, IEmulator *Model3, CInputs *Inputs, COutputs
// Emulate!
fpsFramesElapsed = 0;
framesElapsed = 0;
prevFPSTicks = SDL_GetTicks();
startTicks = prevFPSTicks;
quit = false;
paused = false;
dumpTimings = false;
@ -1005,6 +1010,8 @@ int Supermodel(const char *zipFile, IEmulator *Model3, CInputs *Inputs, COutputs
#endif
while (!quit)
{
auto startTime = SDL_GetTicks();
// Render if paused, otherwise run a frame
if (paused)
Model3->RenderFrame();
@ -1287,14 +1294,12 @@ int Supermodel(const char *zipFile, IEmulator *Model3, CInputs *Inputs, COutputs
if (paused || g_Config.throttle)
{
++framesElapsed;
unsigned targetTicks = startTicks + (unsigned) ((float)framesElapsed * 1000.0f/60.0f);
if (currentTicks <= targetTicks) // add a delay until we reach the next (target) frame time
SDL_Delay(targetTicks - currentTicks);
else // begin a new frame
{
framesElapsed = 0;
startTicks = currentTicks;
UINT32 endTime = SDL_GetTicks();
UINT32 diff = endTime - startTime;
UINT32 frameTime = (UINT32)(1000 / 60.f); // 60 fps, we could roll with 57.5? that would be a jerk fest on 60hz screens though
if (diff < frameTime) {
SuperSleep(frameTime - diff);
}
}