static bool ReadInitExtensions()
{
HDC hDC;
HGLRC hRC;
HWND dummy;
PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR),
1,
PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
32, // color depth
0, 0, 0, 0, 0, 0,
0,
0,
0,
0, 0, 0, 0,
16, // z depth
0, // stencil buffer
0,
PFD_MAIN_PLANE,
0,
0, 0, 0
};
int pixelFormat;
// we have to create a dummy window to init stuff from or the full init stuff fails
dummy = InitDummy();
hDC = GetDC(dummy);
pixelFormat = ChoosePixelFormat(hDC, &pfd);
DescribePixelFormat(hDC, pixelFormat, sizeof(pfd), &pfd);
SetPixelFormat(hDC, pixelFormat, &pfd);
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC, hRC);
wglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC)wglGetProcAddress("wglChoosePixelFormatARB");
wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)wglGetProcAddress("wglCreateContextAttribsARB");
// any extra stuff here?
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
ReleaseDC(dummy, hDC);
ShutdownDummy(dummy);
return true;
}
bool WINDOW::Init( char * windowTitle, int newWidth, int newHeight,
int newRedBits, int newGreenBits, int newBlueBits, int newAlphaBits,
int newDepthBits, int newStencilBits,
bool newFullscreen, bool newVSync, bool dialogBox)
{
//Set member variables
title=windowTitle;
width=newWidth;
height=newHeight;
redBits=newRedBits;
greenBits=newGreenBits;
blueBits=newBlueBits;
alphaBits=newAlphaBits;
depthBits=newDepthBits;
stencilBits=newStencilBits;
fullscreen=newFullscreen;
vSync=newVSync;
LOG::Instance()->OutputSuccess("Creating temporary window");
LOG::Instance()->OutputNewLine();
//Init dummy window to get extension pointers
if(!InitDummy())
return false;
LOG::Instance()->OutputNewLine();
bool revertToStandard=false;
//Initiate the WGL extensions. If not supported, use the standard window
if( !SetUpWGL_ARB_extensions_string())
revertToStandard=true;
//If ARB_extensions_string is supported,
if(!revertToStandard)
{
//Get the WGL extensions string
const char * wglExtensions;
wglExtensions=wglGetExtensionsStringARB(hDC);
//If the necessary extensions are not supported, use the standard window
if( !SetUpWGL_ARB_pixel_format(wglExtensions) ||
!SetUpWGL_EXT_swap_control(wglExtensions))
revertToStandard=true;
//Also initialise ARB_multisample
SetUpWGL_ARB_multisample(wglExtensions);
}
//If we need to revert to standard, shut down the dummy window, Create standard window
//and return
if(revertToStandard)
{
LOG::Instance()->OutputNewLine();
LOG::Instance()->OutputSuccess("Destroying temporary window");
ShutdownDummy();
LOG::Instance()->OutputNewLine();
LOG::Instance()->OutputSuccess("Replacing with standard, non WGL_extension window");
LOG::Instance()->OutputNewLine();
InitStandard();
return true;
}
//If we have reached here, the ARB extensions are supported.
//Shutdown this window and create a window using ARB_pixel_format etc
//Find supported AA samples with given color bits, if ARB_multisample is supported
for(int i=0; i<17; ++i)
samplesSupported[i]=false;
if(WGL_ARB_multisample_supported)
{
FindSamplesSupported();
}
else
{
samplesSupported[0]=true;
}
//Destroy temporary window
LOG::Instance()->OutputNewLine();
LOG::Instance()->OutputSuccess("Destroying temporary window");
ShutdownDummy();
//Creat WGL extension window
LOG::Instance()->OutputNewLine();
LOG::Instance()->OutputSuccess("Replacing with WGL_extension window");
LOG::Instance()->OutputNewLine();
if(InitExtended(dialogBox))
return true;
//If we reached here, InitExtended failed.
//Try a standard window as a last resort
//Destroy extended window
LOG::Instance()->OutputNewLine();
LOG::Instance()->OutputSuccess("Extended window creation failed - Destroying");
ShutdownDummy(); //Use ShutdownDummy as we have not hidden the cursor yet.
//So, we do not want the call to show it
//Create standard window
LOG::Instance()->OutputNewLine();
LOG::Instance()->OutputSuccess("Replacing with standard window");
LOG::Instance()->OutputNewLine();
if(InitStandard())
return true;
//All window creation attempts failed
LOG::Instance()->OutputNewLine();
LOG::Instance()->OutputError("All window Creation attempts failed!");
Shutdown();
return false;
}
