void Tracer::trace()
{
if( !scene_ || is_tracing_ )
{
return;
}
startTracing();
const int width = film_->getWidth();
const int height = film_->getHeight();
const double aspect = static_cast< double >( width ) /
static_cast< double >( height );
Logging::log( LogLevel::Info,
"[Tracer] Tracing image with " + std::to_string( width ) +
" x " + std::to_string( height ) + " pixels (w x h) and " +
std::to_string( rays_per_pixel_ ) + " samples per pixel." );
std::thread t( [=]{
#pragma omp parallel for schedule( dynamic, 1 )
for( int samp = 0; samp < rays_per_pixel_; ++samp )
{
for( int y = 0; y < height && is_tracing_; ++y )
{
for( int x = 0; x < width && is_tracing_; ++x )
{
const double x_d = static_cast< double >( x );
const double y_d = static_cast< double >( y );
const double width_d = static_cast< double >( width );
const double height_d = static_cast< double >( height );
const double dx = aspect * ( x_d / width_d - .5 );
const double dy = ( y_d / height_d - .5 );
Color sample = traceLocation( dx, dy );
film_->addSample( x, y, sample );
curr_num_samples_.fetch_add( 1 );
}
}
}
stopTracing();
auto perf_string = std::to_string( getSpeedAsMsamplesPerSec() );
// @TODO cutting away unwanted digits entails wrong rounding
perf_string = perf_string.substr( 0, perf_string.length() - 4 );
Logging::log( LogLevel::Info,
"[Tracer] Generated samples at a rate of " + perf_string +
" Msamples/sec." );
} );
t.detach();
}
//////////////////////////////////////////////////////////////////////////////
//WINMAIN
//////////////////////////////////////////////////////////////////////////////
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
#ifdef DEBUGGING
startTracing(TRACEFILENAME);
#endif
TRACE ("Start of Session___");
//assign instance to global variable
hInstMain=hInstance;
//create window class
WNDCLASSEX wcx;
//set the size of the structure
wcx.cbSize=sizeof(WNDCLASSEX);
//class style
wcx.style=CS_OWNDC | CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
//window procedure
wcx.lpfnWndProc=TheWindowProc;
//class extra
wcx.cbClsExtra=0;
//window extra
wcx.cbWndExtra=0;
//application handle
wcx.hInstance=hInstMain;
//icon
wcx.hIcon=LoadIcon(NULL,IDI_APPLICATION);
//cursor
wcx.hCursor=LoadCursor(NULL,IDC_ARROW);
//background color
wcx.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
//menu
wcx.lpszMenuName=NULL;
//class name
wcx.lpszClassName=WINDOWCLASS;
//small icon
wcx.hIconSm=NULL;
//register the window class, return 0 if not successful
if(!RegisterClassEx(&wcx)) return(0);
//create main window
hWndMain=CreateWindowEx(0,
WINDOWCLASS,
WINDOWTITLE,
WS_BORDER | WS_SYSMENU | WS_VISIBLE,
0,
0,
windowHorizontalSize,
windowVerticalSize,
NULL,
NULL,
hInstMain,
NULL);
//error check
if(!hWndMain)
{
return(0);
}
//if program initialization failed, then return with 0
if(!Prog_Init())
{
return(0);
}
//message structure
MSG msg;
TRACE("start message pump..");
//message pump
for(;;)
{
//look for a message
if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))
{
//there is a message
//check that we arent quitting
if(msg.message==WM_QUIT)
{
break;
}
//translate message
TranslateMessage(&msg);
//dispatch message
DispatchMessage(&msg);
}
//run main game loop
Prog_Loop();
}
//clean up program data
Prog_Done();
#ifdef DEBUGGING
stopTracing();
#endif
//return the wparam from the WM_QUIT message
return(msg.wParam);
}