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Problem in Multithreaded rendering

Started by idreamlovey Apr 3, 2007 at 2:15 PM 4 replies 1.3k views

Original Post

Apr 3, 2007 at 2:15 PM

I am using one thread to load the game data and another thread to render the current loading by rendering splash with progress bar.The problem is data loading is working but i can't see any splash rendering. Even not a single time splash appears on the screen. I m new with multithreading. The following is my code:- //Start of Code HANDLE hThrd1,hThrd2; hThrd1 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)LoadMenuObjects, this, CREATE_SUSPENDED, NULL); ResumeThread(hThrd1); SetThreadPriority(hThrd1,THREAD_PRIORITY_HIGHEST); // Run the secound Thread hThrd2 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)RenderLoadingPage, this, CREATE_SUSPENDED, NULL); ResumeThread(hThrd2); SetThreadPriority(hThrd1,THREAD_PRIORITY_LOWEST); UINT LoadMenuObjects(LPVOID lpvoid) { CMyGame *vPt = (CMyGame *)lpvoid; vPt->nGlobalMax = 38; vPt->nGlobalCt = 1; vPt->ConstructMenuObjects(0); vPt->RestoreMenuObjects(0); vPt->ConstructEngineObjects(); vPt->RestoreEngineObjects(); vPt->m_dwAppState = APPSTATE_RESET_TIME2; return 0; } UINT RenderLoadingPage(LPVOID lpvoid) { COvertake *vPt = (COvertake *)lpvoid; while(vPt->m_dwAppState != APPSTATE_RESET_TIME2) { vPt->RenderSplashObjects(1,vPt->nGlobalCt,vPt->nGlobalMax); break; } return 0; } //End of Code

Uziel2101

Apr 3, 2007 at 2:33 PM

vPt->m_dwAppState = APPSTATE_RESET_TIME2;

while(vPt->m_dwAppState != APPSTATE_RESET_TIME2)

isn't it supposed to be ==

this is just a quick glance, will get back to it when I get back from lunch

Evil Steve

Apr 3, 2007 at 2:55 PM

And what do the debug runtimes tell you? Does it work when it's single-threaded?

idreamlovey

Apr 3, 2007 at 11:24 PM

Previously vPt->m_dwAppState is set to APPSTATE_LOAD_GAME so here the loop while is working fine but yes it does slows the loading and thats why i put break there in the next line.
In single threaded, i called loading and render functions alternately and it works fine but when i call them as follows
LoadMenuObjects(this);
RenderLoadingPage(this);
it doesn't works and i test whether it really executing the render function by
UINT RenderLoadingPage(LPVOID lpvoid)
{
CMyGame *vPt = (CMyGame *)lpvoid;
vPt->RenderSplashObjects(1,vPt->nGlobalCt,vPt->nGlobalMax);
vPt->RenderSplashObjects(1,vPt->nGlobalCt,vPt->nGlobalMax);
vPt->RenderSplashObjects(1,vPt->nGlobalCt,vPt->nGlobalMax);
vPt->RenderSplashObjects(1,vPt->nGlobalCt,vPt->nGlobalMax);
/*while(vPt->m_dwAppState != APPSTATE_RESET_TIME4&&vPt->m_dwAppState != APPSTATE_RESET_TIME2)
{
vPt->RenderSplashObjects(1,vPt->nGlobalCt,vPt->nGlobalMax);
}*/
return 0;
}
and it comes out that it is executing but does not appears on the screen.

idreamlovey

Apr 3, 2007 at 11:45 PM

i am using directx and already set the option D3DCREATE_MULTITHREADED at the creation time. I also tried remove the priority option and i set rendering function in main thread and the code becomes like as below:-

if(m_bIsLoading==false)
{
m_bIsLoading = true;
HANDLE hThrd1;
hThrd1 = CreateThread(NULL, 0,(LPTHREAD_START_ROUTINE) LoadMenuObjects,
this, CREATE_SUSPENDED, NULL);
}
RenderSplashObjects(1,nGlobalCt,nGlobalMax);
and it appears RenderSplashObjects() function has been executed 13878 times. And it still nothing appears on the screen.

idreamlovey

Apr 3, 2007 at 11:59 PM

Problem is solved its not problem in my coding the only thing that i missed is i haven't put the line
g_pd3dDevice->Present( 0, 0, 0, 0 );

Thanks a lot u guys.

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