static PIXELFORMATDESCRIPTOR pfd= {
sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
1,
PFD_DRAW_TO_WINDOW | // Format Must Support Window
PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
24,
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
24,// 24Bit 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
};
if (!(hDC=GetDC(hWnd))) {
MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return ERR_CANT_CREATE; // Return FALSE
}
if (!(pixel_format=ChoosePixelFormat(hDC,&pfd))) // Did Windows Find A Matching Pixel Format?
{
MessageBox(NULL,"Can't Find A Suitable pixel_format.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return ERR_CANT_CREATE; // Return FALSE
}
if(!SetPixelFormat(hDC,pixel_format,&pfd)) // Are We Able To Set The Pixel Format?
{
MessageBox(NULL,"Can't Set The pixel_format.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return ERR_CANT_CREATE; // Return FALSE
}
if (!(hRC=wglCreateContext(hDC))) // Are We Able To Get A Rendering Context?
{
MessageBox(NULL,"Can't Create A Temporary GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return ERR_CANT_CREATE; // Return FALSE
}
wglMakeCurrent(hDC,hRC);
int attribs[] = {
WGL_CONTEXT_MAJOR_VERSION_ARB, 3,//we want a 3.1 context
WGL_CONTEXT_MINOR_VERSION_ARB, 1,
//and it shall be forward compatible so that we can only use up to date functionality
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0}; //zero indicates the end of the array
PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = NULL; //pointer to the method
wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC) wglGetProcAddress("wglCreateContextAttribsARB");
if(wglCreateContextAttribsARB == NULL) //OpenGL 3.0 is not supported
{
MessageBox(NULL,"Cannot get Proc Adress for CreateContextAttribs", "ERROR",MB_OK|MB_ICONEXCLAMATION);
wglDeleteContext(hRC);
return ERR_CANT_CREATE;
}
HGLRC new_hRC;
if (!(new_hRC=wglCreateContextAttribsARB(hDC,0, attribs)))
{
wglDeleteContext(hRC);
MessageBox(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return ERR_CANT_CREATE; // Return false
}
wglMakeCurrent(hDC,NULL);
wglDeleteContext(hRC);
hRC=new_hRC;
if (!wglMakeCurrent(hDC,hRC)) // Try To Activate The Rendering Context
{
MessageBox(NULL,"Can't Activate The GL 3.1 Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return ERR_CANT_CREATE;
}
wglGetProcAddress("glClear"); // returns null!
