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Dougie

An embarrassingly simple problem

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Ok, I've just started on OpenGL and I'm already having problems. My attempt to create a tester OpenGL window has failed. I just want a prog that'll create an OpenGL window. I'm working in VC++ 6, on Windows XP. Here's my rough code: #include <windows.h> #include <GL\GL.h> #include <GL\GLU.h> #include <GL\GLaux.h> HGLRC hRC=NULL; LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) { switch( msg ) { case WM_DESTROY: PostQuitMessage( 0 ); return 0; } return DefWindowProc( hWnd, msg, wParam, lParam ); } int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { // TODO: Place code here. // Set up a WNDCLASSEX class to store information about the style of window to be created WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_OWNDC | CS_HREDRAW | CS_VREDRAW, MsgProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, "OpenGL Test", NULL }; RegisterClassEx(&wc); HWND hWnd = CreateWindow( "OpenGL Test", "OpenGL Test 1", WS_OVERLAPPEDWINDOW, 200, 200, 300, 300, NULL, NULL, NULL, NULL); static PIXELFORMATDESCRIPTOR pfd= // pfd Tells Windows How We Want Things To Be { sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor 1, // Version Number PFD_DRAW_TO_WINDOW | // Format Must Support Window PFD_SUPPORT_OPENGL | // Format Must Support OpenGL PFD_DOUBLEBUFFER, // Must Support Double Buffering PFD_TYPE_RGBA, // Request An RGBA Format 16, // Select Our Color Depth 0, 0, 0, 0, 0, 0, // Color Bits Ignored 0, // No Alpha Buffer 0, // Shift Bit Ignored 0, // No Accumulation Buffer 0, 0, 0, 0, // Accumulation Bits Ignored 16, // 16Bit Z-Buffer (Depth Buffer) 0, // No Stencil Buffer 0, // No Auxiliary Buffer PFD_MAIN_PLANE, // Main Drawing Layer 0, // Reserved 0, 0, 0 // Layer Masks Ignored }; HDC hDC = GetDC(hWnd); DescribePixelFormat(hDC, GetPixelFormat(hDC), sizeof(PIXELFORMATDESCRIPTOR), &pfd); GLuint PixelFormat = ChoosePixelFormat(hDC, &pfd); if(!SetPixelFormat(hDC, PixelFormat, &pfd)) { hRC = wglCreateContext(hDC); wglMakeCurrent(hDC, hRC); ShowWindow(hWnd, SW_SHOWNORMAL); MSG msg; ZeroMemory(&msg, sizeof(MSG)); GetMessage(&msg, hWnd, NULL, NULL); while (msg.message != WM_QUIT) { TranslateMessage(&msg); DispatchMessage(&msg); GetMessage(&msg, hWnd, NULL, NULL); } } wglMakeCurrent(NULL,NULL); wglDeleteContext(hRC); ReleaseDC(hWnd,hDC); DestroyWindow(hWnd); UnregisterClass("OpenGl Test", hInstance); return 0; } I know the program fails at "SetPixelFormat(hDC, PixelFormat, &pfd))". So, is it my code? Is it XP? Or what? Please help!! [edited by - Dougie on March 27, 2004 9:37:28 AM]

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Guest Anonymous Poster
call me stupid but it seems like you execute your normal gl initialisation code if SetPixelFormat fails. like so:

if(!SetPixelFormat(hDC, PixelFormat, &pfd))
{
hRC = wglCreateContext(hDC);

wglMakeCurrent(hDC, hRC);

surely that should be vice versa

Also try checking the ret value for ChoosePixelFormat, if it returns zero it could not find an appropriate one

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