Attachment 130833 Details for Bug 100668 – Init WGL & show number of matching pixel formats

Init WGL & show number of matching pixel formats

main.cpp (text/plain), 4.20 KB, created by Charles Huber on 2017-04-13 18:48:51 UTC

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Creator: Charles Huber

Created: 2017-04-13 18:48:51 UTC

Size: 4.20 KB

patch

obsolete

>#include <Windows.h>
>#include <GL/glcorearb.h>
>#include <GL/wgl.h>
>#include <GL/wglext.h>
>#include <sstream>
>
>PFNWGLGETPROCADDRESSPROC wglGetProcAddressDYN;
>PFNWGLCREATECONTEXTPROC wglCreateContextDYN;
>PFNWGLMAKECURRENTPROC wglMakeCurrentDYN;
>PFNSWAPBUFFERSPROC wglSwapBuffersDYN;
>PFNWGLDELETECONTEXTPROC wglDeleteContextDYN;
>
>PFNWGLGETEXTENSIONSSTRINGARBPROC wglGetExtensionsStringARB;
>PFNWGLCHOOSEPIXELFORMATARBPROC wglChoosePixelFormatARB;
>PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB;
>
>//=============================================================================
>template< typename T >
>void GetProc( HMODULE mod, PFNWGLGETPROCADDRESSPROC wglProcAddress, const char* name, T* out )
>{
>    *out = nullptr;
>    if( wglProcAddress )
>        *out = reinterpret_cast< T >( wglProcAddress( name ) );
>    if( !*out )
>        *out = reinterpret_cast< T >( GetProcAddress( mod, name ) );
>}
>
>//=============================================================================
>void GetExtensionFunctions( const HINSTANCE instance )
>{
>    const LPCSTR name = TEXT("dummy-window");
>    WNDCLASS wndclass;
>    ZeroMemory( &wndclass, sizeof( wndclass ) );
>    wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
>    wndclass.lpfnWndProc = DefWindowProc;
>    wndclass.hInstance = instance;
>    wndclass.lpszClassName = name;
>    RegisterClass( &wndclass );
>
>    const HWND wnd = CreateWindow( name, "", WS_DISABLED, 0, 0, 1, 1, NULL, NULL, instance, NULL );
>    const HDC dc = GetDC( wnd );
>        
>    PIXELFORMATDESCRIPTOR pfd;
>    ZeroMemory( &pfd, sizeof( pfd ) );
>    pfd.nSize = sizeof( pfd );
>    pfd.nVersion = 1;
>    pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
>    pfd.iPixelType = PFD_TYPE_RGBA;
>    pfd.cColorBits = 24;
>    pfd.iLayerType = PFD_MAIN_PLANE;
>    const int iPixelFormat = ChoosePixelFormat( dc, &pfd );
>    SetPixelFormat( dc, iPixelFormat, NULL );
>
>    const HMODULE mod = LoadLibrary( TEXT("opengl32.dll") );
>
>    GetProc( mod, NULL, "wglGetProcAddress", &wglGetProcAddressDYN );
>    GetProc( mod, NULL, "wglCreateContext", &wglCreateContextDYN );
>    GetProc( mod, NULL, "wglMakeCurrent", &wglMakeCurrentDYN );
>    GetProc( mod, NULL, "wglSwapBuffers", &wglSwapBuffersDYN );
>    GetProc( mod, NULL, "wglDeleteContext", &wglDeleteContextDYN );
>
>    const HGLRC rc = wglCreateContextDYN( dc );
>    wglMakeCurrentDYN( dc, rc );
>
>    GetProc( mod, wglGetProcAddressDYN, "wglGetExtensionsStringARB", &wglGetExtensionsStringARB );
>    GetProc( mod, wglGetProcAddressDYN, "wglChoosePixelFormatARB", &wglChoosePixelFormatARB );
>    GetProc( mod, wglGetProcAddressDYN, "wglCreateContextAttribsARB", &wglCreateContextAttribsARB );
>
>    FreeLibrary( mod );
>
>    wglMakeCurrentDYN( dc, NULL );
>    wglDeleteContextDYN( rc );
>    ReleaseDC( wnd, dc );
>    DestroyWindow( wnd );
>    UnregisterClass( name, instance );
>}
>
>//=============================================================================
>int WINAPI WinMain( HINSTANCE instance, HINSTANCE prvInstance, PSTR cmdLine, int cmdShow )
>{
>    GetExtensionFunctions( instance );
>
>    const LPCSTR name = TEXT("OpenGLWindow");
>    WNDCLASS wndclass;
>    ZeroMemory( &wndclass, sizeof( wndclass ) );
>    wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
>    wndclass.lpfnWndProc = DefWindowProc;
>    wndclass.hInstance = instance;
>    wndclass.lpszClassName = name;
>    RegisterClass( &wndclass );
>
>    const HWND wnd = CreateWindow( name, "", WS_OVERLAPPEDWINDOW, 0, 0, 1, 1, NULL, NULL, instance, NULL );
>    const HDC dc = GetDC( wnd );
>        
>    int format = 0;
>    UINT numFormats = 0;
>    int pixel_attributes[] =
>    {
>        WGL_SUPPORT_OPENGL_ARB, TRUE,
>        WGL_DOUBLE_BUFFER_ARB, TRUE,
>    #if 1
>        WGL_SWAP_METHOD_ARB, WGL_SWAP_UNDEFINED_ARB,
>    #else
>        WGL_SWAP_METHOD_ARB, WGL_SWAP_COPY_ARB,
>    #endif
>        0
>    };
>    wglChoosePixelFormatARB( dc, pixel_attributes, NULL, 1, &format, &numFormats );
>
>    std::stringstream ss;
>    ss << "numFormats: " << numFormats << std::endl;
>    MessageBox( wnd, ss.str().c_str(), "Message", MB_OK ); 
>
>    ReleaseDC( wnd, dc );
>    DestroyWindow( wnd );
>    UnregisterClass( name, instance );
>    return 0;
>}

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Attachments on bug 100668: 130833

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