/**
* Create an OpenGL context.
*/
FPlatformOpenGLContext* PlatformCreateOpenGLContext(FPlatformOpenGLDevice* Device, void* InWindowHandle)
{
check(InWindowHandle);
Device->TargetDirty = true;
FPlatformOpenGLContext* Context = new FPlatformOpenGLContext;
Context->WindowHandle = (HWND)InWindowHandle;
Context->bReleaseWindowOnDestroy = false;
Context->DeviceContext = GetDC(Context->WindowHandle);
check(Context->DeviceContext);
PlatformInitPixelFormatForDevice(Context->DeviceContext, false);
int MajorVersion = 0;
int MinorVersion = 0;
PlatformOpenGLVersionFromCommandLine(MajorVersion, MinorVersion);
PlatformCreateOpenGLContextCore(Context, MajorVersion, MinorVersion, Device->SharedContext.OpenGLContext);
check(Context->OpenGLContext);
{
FScopeContext Scope(Context);
InitDefaultGLContextState();
glGenFramebuffers(1, &Context->ViewportFramebuffer);
}
Device->ViewportContexts.Add(Context);
return Context;
}
/**
* Create a dummy window used to construct OpenGL contexts.
*/
static void PlatformCreateDummyGLWindow(FPlatformOpenGLContext* OutContext)
{
const TCHAR* WindowClassName = TEXT("DummyGLWindow");
// Register a dummy window class.
static bool bInitializedWindowClass = false;
if (!bInitializedWindowClass)
{
WNDCLASS wc;
bInitializedWindowClass = true;
FMemory::MemZero(wc);
wc.style = CS_OWNDC;
wc.lpfnWndProc = PlatformDummyGLWndproc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = NULL;
wc.hIcon = NULL;
wc.hCursor = NULL;
wc.hbrBackground = (HBRUSH)(COLOR_MENUTEXT);
wc.lpszMenuName = NULL;
wc.lpszClassName = WindowClassName;
ATOM ClassAtom = ::RegisterClass(&wc);
check(ClassAtom);
}
// Create a dummy window.
OutContext->WindowHandle = CreateWindowEx(
WS_EX_WINDOWEDGE,
WindowClassName,
NULL,
WS_POPUP,
0, 0, 1, 1,
NULL, NULL, NULL, NULL);
check(OutContext->WindowHandle);
OutContext->bReleaseWindowOnDestroy = true;
// Get the device context.
OutContext->DeviceContext = GetDC(OutContext->WindowHandle);
check(OutContext->DeviceContext);
PlatformInitPixelFormatForDevice(OutContext->DeviceContext);
}
/**
* Create an OpenGL context.
*/
FPlatformOpenGLContext* PlatformCreateOpenGLContext(FPlatformOpenGLDevice* Device, void* InWindowHandle)
{
check(InWindowHandle);
FPlatformOpenGLContext* Context = new FPlatformOpenGLContext;
Context->WindowHandle = (HWND)InWindowHandle;
Context->bReleaseWindowOnDestroy = false;
Context->DeviceContext = GetDC(Context->WindowHandle);
check(Context->DeviceContext);
PlatformInitPixelFormatForDevice(Context->DeviceContext);
int MajorVersion = 0;
int MinorVersion = 0;
PlatformOpenGLVersionFromCommandLine(MajorVersion, MinorVersion);
PlatformCreateOpenGLContextCore(Context, MajorVersion, MinorVersion, Device->SharedContext.OpenGLContext);
check(Context->OpenGLContext);
{
FScopeContext Scope(Context);
InitDefaultGLContextState();
}
return Context;
}
