// Frees all resources and removes all assets from asset library
//-----------------------------------------------------------------------------
void CPUT_OGL::RestartCPUT()
{
//
// Clear out all CPUT resources
//
// CPUTInputLayoutCacheDX11::GetInputLayoutCache()->ClearLayoutCache();
CPUTAssetLibrary::GetAssetLibrary()->ReleaseAllLibraryLists();
// CPUTGuiControllerDX11::GetController()->DeleteAllControls();
// CPUTGuiControllerDX11::GetController()->ReleaseResources();
//
// Clear out all DX resources and contexts
//
DestroyOGLContext();
//
// Signal the window to close
//
// mpWindow->Destroy();
//
// Clear out the timer
//
mpTimer->StopTimer();
mpTimer->ResetTimer();
HEAPCHECK;
}
void OGLWindow::DestroyOGLWindow()
{
DestroyOGLContext();
DestroyWindow( m_hwnd );
m_hwnd = NULL;
m_hdc = NULL;
}
OGLWindow::~OGLWindow()
{
//Clean up the renderable
delete m_mesh;
delete m_shader;
delete m_skyBox;
delete m_skyBoxShader;
delete m_plane;
DestroyOGLContext();
}
// Actually destroy all 'global' resource handling objects, all asset handlers,
// the DX context, and everything EXCEPT the window
//-----------------------------------------------------------------------------
void CPUT_OGL::ShutdownAndDestroy()
{
// make sure no more rendering can happen
mbShutdown = true;
// call the user's OnShutdown code
Shutdown();
CPUTAssetLibrary::DeleteAssetLibrary();
CPUTGuiControllerOGL::DeleteController();
CPUTRenderStateBlock::SetDefaultRenderStateBlock( NULL );
SAFE_RELEASE(mpPerFrameConstantBuffer);
SAFE_RELEASE(mpPerModelConstantBuffer);
DestroyOGLContext();
// Tell the window layer to post a close-window message to OS
// and stop the message pump
mpWindow->Destroy();
HEAPCHECK;
}
HWND CPUT_OGL::CreateDummyWindow(HINSTANCE hInst)
{
WNDCLASS Window; // Window class
uint32 PixelFormat; // Format of pixel
// Window settings
Window.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // Have its own Device Context and also cannot be resized
Window.lpfnWndProc = (WNDPROC) WndProcDummy; // Procedure that handles OS evets
Window.cbClsExtra = 0; // No extra window data
Window.cbWndExtra = 0; //
Window.hInstance = hInst; // Handle to instance of program that this window belongs to
Window.hIcon = LoadIcon(NULL, IDI_WINLOGO); // Load default icon
Window.hCursor = LoadCursor(NULL, IDC_ARROW); // Load arrow pointer
Window.hbrBackground = NULL; // No background (OpenGL will handle this)
Window.lpszMenuName = NULL; // No menu
Window.lpszClassName = L"DummyWindowClass"; // Class name
// Registering Window Class
if ( !RegisterClass( &Window ) )
{
cerr << "Error! Cannot register window class." << endl;
return NULL;
}
// Create Dummy Window with OpenGL RC to gather required
// information together with wgl functions pointers and
// final Pixel Format number.
HWND hWnd = CreateWindow(
L"DummyWindowClass", // Window class name
L"CPUTFramework...", // Title of window
WS_CLIPSIBLINGS | // \_Prevents from overdrawing
WS_CLIPCHILDREN | // / by other windows
WS_OVERLAPPEDWINDOW, // Additional styles
0, 0, // Position
128, // True window widht
128, // True window height
NULL, // No parent window
NULL, // No menu
hInst, // Handle to this instance of program
NULL ); // Won't pass anything
// Check if dummy window was created
if ( hWnd == NULL )
{
cerr << "Error! Cannot create window." << endl;
DestroyOGLContext();
return NULL;
}
// Acquiring Device Context
mhDC = GetDC( hWnd );
if ( mhDC == NULL )
{
cerr << "Error! Cannot create device context." << endl;
DestroyOGLContext();
return NULL;
}
// Choosing Pixel Format the old way
PixelFormat = ChoosePixelFormat( mhDC, &pfdLegacy );
if ( PixelFormat == NULL )
{
cerr << "Error! Cannot find aproprieate pixel format." << endl;
DestroyOGLContext();
return NULL;
}
// Activating Pixel Format
if ( !SetPixelFormat( mhDC, PixelFormat, &pfdLegacy ) )
{
cerr << "Error! Cannot init pixel format." << endl;
DestroyOGLContext();
return NULL;
}
// Creating OpenGL Rendering Context
mhRC = wglCreateContext( mhDC );
if ( mhRC == NULL )
{
cerr << "Error! Cannot create window rendering context." << endl;
DestroyOGLContext();
return NULL;
}
// Activating rendering context
if ( !wglMakeCurrent( mhDC, mhRC ) )
{
cerr << "Error! Cannot activate rendering context." << endl;
DestroyOGLContext();
return NULL;
}
return hWnd;
}
CPUTResult CPUT_OGL::CreateOGLContext(CPUTContextCreation ContextParams )
{
HWND hWnd;
hWnd = CreateDummyWindow( GetModuleHandle(NULL));
// Create dummy window to gather information about OpenGL
if ( ! hWnd)
{
return CPUT_ERROR;
}
// To get list of supported extensions, this
// code should be used since OpenGL 3.0 Core:
//
// uint32 count = 0;
// glGetIntegerv(GL_NUM_EXTENSIONS, (GLint*)&count);
// for(uint16 i=0; i<count; i++)
// support.m_extensions.insert(support.m_extensions.end(),string((char*)glGetStringi(GL_EXTENSIONS,i));
//
// But data about gpu, are gathered in dummy
// OpenGL context which works in deprecaded
// mode. This forces implementation in old
// deprecated way:
// Creates table of supported extensions strings
extensions.clear();
string tmp;
sint32 begin, end;
tmp = string( (char*)glGetString( GL_EXTENSIONS ) );
begin = 0;
end = tmp.find( ' ', 0 );
while( end != string::npos )
{
extensions.insert( extensions.end(), tmp.substr( begin, end-begin ) );
begin = end + 1;
end = tmp.find( ' ', begin );
}
// This extension together with WGL_EXT_swap_interval
// should be returned in list of supported extensions
// after calling glGetString(GL_EXTENSIONS);
// Because NVidia drivers don't follow this rule it's
// specification says as follow:
//
// "Applications should call wglGetProcAddress to see
// whether or not wglGetExtensionsStringARB is supported."
// ( http://www.opengl.org/registry/specs/ARB/wgl_extensions_string.txt )
//
bool wglexts = false;
wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) wglGetProcAddress( "wglGetExtensionsStringARB" );
if ( wglGetExtensionsStringARB != NULL )
{
tmp = string( (char*)wglGetExtensionsStringARB( mhDC ) );
wglexts = true;
}
else
{
wglGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC) wglGetProcAddress( "wglGetExtensionsStringEXT" );
if ( wglGetExtensionsStringEXT != NULL )
{
tmp = string( (char*)wglGetExtensionsStringEXT() );
wglexts = true;
}
}
// If it is possible to obtain WGL extensions list add
// them to the rest of supported extensions.
if ( wglexts )
{
begin = 0;
end = tmp.find( ' ', 0 );
while( end != string::npos )
{
extensions.insert( extensions.end(), tmp.substr( begin, end-begin ) );
begin = end + 1;
end = tmp.find( ' ', begin );
}
}
// Get pointers to WGL specific functions that are required during window creation
wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC) wglGetProcAddress( "wglCreateContextAttribsARB" );
wglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC) wglGetProcAddress( "wglChoosePixelFormatARB" );
wglChoosePixelFormatEXT = (PFNWGLCHOOSEPIXELFORMATEXTPROC) wglGetProcAddress( "wglChoosePixelFormatEXT" );
// Set Samples count in Advanced Pixel Format
iAttributes[27] = ContextParams.samples;
// Choosing advanced Pixel Format in modern way
uint32 PixelFormat = 0;
bool choosedPixelFormat = false;
if ( supportExtension( "WGL_ARB_pixel_format" ) )
{
uint32 numFormats;
if ( wglChoosePixelFormatARB( mhDC, (const int*)iAttributes, fAttributes, 1, (int*)&PixelFormat, (unsigned int*)&numFormats ) )
if ( numFormats >= 1 )
choosedPixelFormat = true;
}
// Old way for choosing advanced Pixel Format
if ( !choosedPixelFormat &&
supportExtension( "WGL_EXT_pixel_format" ) )
{
uint32 numFormats;
if ( wglChoosePixelFormatEXT( mhDC, (const int*)iAttributes, fAttributes, 1, (int*)&PixelFormat, (unsigned int*)&numFormats ) )
if ( numFormats >= 1 )
choosedPixelFormat = true;
}
// Basic Pixel Format
if ( !choosedPixelFormat )
PixelFormat = ChoosePixelFormat( mhDC, &pfdLegacy );
// If couldn't find Pixel Format report error
if ( PixelFormat == NULL )
{
cerr << "Error! Cannot find aproprieate pixel format." << endl;
DestroyOGLContext();
return CPUT_ERROR;
}
// Data about OpenGL are gathered, proper Pixel Format is choosed.
// Destroy Dummy Window and proceed to creation of proper window.
// Disabling and deleting all rendering contexts
wglMakeCurrent( NULL, NULL );
wglDeleteContext( mhRC );
mhRC = NULL;
// Disabling device context
ReleaseDC( hWnd, mhDC );
mhDC = 0;
// Deleting window
DestroyWindow( hWnd );
// Unregistering window class
if(TRUE != UnregisterClass( L"DummyWindowClass", GetModuleHandle(NULL) ))
{
return CPUT_ERROR;
}
// Clear message queue
MSG msg = { 0 };
while( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
hWnd = mpWindow->GetHWnd();
// Acquiring Device Context
mhDC = GetDC( hWnd );
if ( mhDC == NULL )
{
cerr << "Error! Cannot create device context." << endl;
DestroyOGLContext();
return CPUT_ERROR;
}
// Activating Pixel Format
if ( !SetPixelFormat( mhDC, PixelFormat, &pfdLegacy ) )
{
cerr << "Error! Cannot init pixel format." << endl;
DestroyOGLContext();
return CPUT_ERROR;
}
// OpenGL 4.0 Core profile settings
uint32 glAttributes[] = { WGL_CONTEXT_MAJOR_VERSION_ARB, 4,
WGL_CONTEXT_MINOR_VERSION_ARB, 0,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
GL_CONTEXT_PROFILE_MASK, GL_CONTEXT_CORE_PROFILE_BIT,
0, 0 };
// GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
// GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
// Debug version supports better debugging
#ifdef _DEBUG
glAttributes[5] |= WGL_CONTEXT_DEBUG_BIT_ARB;
#endif
// Try to create OpenGL context in new way
mhRC = wglCreateContextAttribsARB( mhDC, 0, (const int *) &glAttributes );
if ( mhRC == NULL )
{
cerr << "Error! Cannot create window rendering context." << endl;
DestroyOGLContext();
return CPUT_ERROR;
}
// Activating rendering context
if( !wglMakeCurrent( mhDC, mhRC ) )
{
std::cerr << "Error! Cannot activate rendering context." << endl;
DestroyOGLContext();
return CPUT_ERROR;
}
// Setting created window as current
ShowWindow( hWnd, SW_SHOW );
SetForegroundWindow( hWnd );
SetFocus( hWnd );
// Link all OpenGL function pointers
glewExperimental = TRUE;
if ( glewInit() != GLEW_OK )
{
cerr << "Error! Cannot activate GLEW." << endl;
DestroyOGLContext();
return CPUT_ERROR;
}
// GLEW's problem is that it calls glGetString(GL_EXTENSIONS) which causes
// GL_INVALID_ENUM on GL 3.2 core context as soon as glewInit() is called.
// Clear errors indicator
glGetError();
wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress( "wglSwapIntervalEXT" );
wglSwapIntervalEXT(0);
return CPUT_SUCCESS;
}
