Dear All,
The program and instructions given in the OSG Beginner book Ch9 "Integrating
OSG into a window"doesn't work for me. Firstly I thought that it was due to the
poor grasp of me of understanding the OSG working mechanism, because I
originally started to test in wxWidgets instead of creating directly Win32
window. Following the instructions given in the book I observed the very same
behaviour as it was in wxWidgets example case. Windos is spawning but showns
only the blue screen, absolutely nothing in scene.
So at the attachment I provide the Win32 file which doesn't produce any
expected result for me, I kindly ask if someone can testify whether the same
behaviour will be observed on different platforms or not.
Mine is OSG 3.0.0 stable, MinGW 4.7.1, Win64.
Regards,
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#include <windows.h>
#include <process.h>
#include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator>
#include <osgViewer/api/win32/GraphicsWindowWin32>
#include <osgViewer/Viewer>
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
/* Make the class name into a global variable */
TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp");
osg::ref_ptr<osgViewer::Viewer> g_viewer;
bool g_finished;
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
_T("Code::Blocks Template Windows App"), /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
void render( void* )
{
while ( !g_viewer->done() )
g_viewer->frame();
g_finished = true;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
case WM_CREATE:
{
osg::ref_ptr<osg::Referenced> windata = new osgViewer::GraphicsWindowWin32::WindowData( hwnd );
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->x = 0;
traits->y = 0;
traits->width = 800;
traits->height = 600;
traits->windowDecoration = false;
traits->doubleBuffer = true;
traits->inheritedWindowData = windata;
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext( traits.get() );
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
camera->setGraphicsContext( gc );
camera->setViewport(
new osg::Viewport(0, 0, traits->width, traits->height) );
camera->setClearMask( GL_DEPTH_BUFFER_BIT |
GL_COLOR_BUFFER_BIT );
camera->setClearColor( osg::Vec4f(0.2f, 0.2f, 0.4f, 1.0f) );
camera->setProjectionMatrixAsPerspective(
30.0f,(double)traits->width/(double)traits
->height,1.0,1000.0 );
g_viewer = new osgViewer::Viewer;
g_viewer->setCamera( camera.get() );
osg::ref_ptr<osg::Node> lmodel = osgDB::readNodeFile("cessna.osg");
//if (lmodel.valid())
g_viewer->setSceneData( lmodel.get() );
g_viewer->setKeyEventSetsDone( 0 );
g_viewer->setCameraManipulator(
new osgGA::TrackballManipulator );
g_finished = false;
_beginthread( render, 0, NULL );
return 0;
}
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
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