func (window *Win32Window) GetHDC() unsafe.Pointer {
if window.hdc != nil {
return unsafe.Pointer(&window.hdc)
}
window.hdc = C.GetDC(window.hwnd)
px := C.PIXELFORMATDESCRIPTOR{
dwFlags: 0x00000001 | 0x00000020 | 0x00000004,
iPixelType: 0,
cColorBits: 32,
cDepthBits: 32,
iLayerType: 0,
}
px.nSize = (C.WORD)(unsafe.Sizeof(px))
pxFormat := C.ChoosePX(window.hdc, &px)
if pxFormat == 0 {
return nil
}
res := C.SetPixelFormat(window.hdc, pxFormat, &px)
if res == 0 {
return nil
}
return unsafe.Pointer(&window.hdc)
}
func (ic *contextInternal) initializeFromSettings(settings ContextSettings, width, height int) ThreadError {
ic.deactivateSignal = make(chan bool)
ic.settings = settings
ic.window = createHiddenWindow(width, height)
if ic.window == nil {
// C.GetLastError()
return NewThreadError(fmt.Errorf("could not create window (%d)", C.GetLastError()), true)
}
ic.ownsWindow = true
ic.hdc = C.GetDC(ic.window)
if ic.hdc == nil {
return NewThreadError(errors.New("no device context"), true)
}
if sharedContext == nil { // if there is no shared context, we are it
ic.isSharedContext = true
pfd := C.PIXELFORMATDESCRIPTOR{
nSize: C.PIXELFORMATDESCRIPTOR_size, // size of this pfd
nVersion: 1, // version number
iPixelType: C.PFD_TYPE_RGBA, // RGBA type
cColorBits: 24, // 24-bit color depth
cDepthBits: 32, // 32-bit z-buffer
iLayerType: C.PFD_MAIN_PLANE, // main layer
// support window | OpenGL | double buffer
dwFlags: C.PFD_DRAW_TO_WINDOW | C.PFD_SUPPORT_OPENGL | C.PFD_DOUBLEBUFFER,
}
// get the best available match of pixel format for the device context
// make that the pixel format of the device context
if iPixelFormat := C.ChoosePixelFormat(ic.hdc, &pfd); iPixelFormat == 0 {
return NewThreadError(fmt.Errorf("sharedContext: ChoosePixelFormat failed (%d)", C.GetLastError()), true)
} else if C.SetPixelFormat(ic.hdc, iPixelFormat, &pfd) == C.FALSE {
return NewThreadError(fmt.Errorf("sharedContext: SetPixelFormat failed (%d)", C.GetLastError()), true)
}
ic.context = C.wglCreateContext(ic.hdc)
if ic.context == nil {
return NewThreadError(fmt.Errorf("sharedContext: wglCreateContext failed (%d)", C.GetLastError()), true)
}
} else { // otherwise we push the commands onto the shared context thread
bitsPerPixel := GetDefaultMonitor().GetDesktopMode().BitsPerPixel
ic.context = createContext(&sharedContext.internal.procs, sharedContext.internal.context, ic.hdc, bitsPerPixel, &ic.settings)
if ic.context == nil {
return NewThreadError(fmt.Errorf("could not create context (%d)", C.GetLastError()), true)
}
}
// signal because we start out deactivated
ic.signalDeactivation()
return nil
}
// Creates the window. This function expects not to be called on a ContextThread
func (wi *windowInternal) initialize(monitor *Monitor, mode VideoMode, title string, style WindowStyle) ThreadError {
// Compute position and size
screenDC := C.GetDC(nil)
width := C.int(mode.Width)
height := C.int(mode.Height)
left := (C.GetDeviceCaps(screenDC, C.HORZRES) - width) / 2
top := (C.GetDeviceCaps(screenDC, C.VERTRES) - height) / 2
C.ReleaseDC(nil, screenDC)
// Choose the window style according to the Style parameter
win32Style := C.DWORD(C.WS_VISIBLE)
if style == WindowStyleNone {
win32Style |= C.WS_POPUP
} else {
if style&WindowStyleTitlebar != 0 {
win32Style |= C.WS_CAPTION | C.WS_MINIMIZEBOX
}
if style&WindowStyleResize != 0 {
win32Style |= C.WS_THICKFRAME | C.WS_MAXIMIZEBOX
}
if style&WindowStyleClose != 0 {
win32Style |= C.WS_SYSMENU
}
}
// In windowed mode, adjust width and height so that window will have the requested client area
fullscreen := style&WindowStyleFullscreen != 0
if !fullscreen {
rectangle := C.RECT{
left: C.LONG(left),
top: C.LONG(top),
right: C.LONG(left + width),
bottom: C.LONG(top + height),
}
C.__AdjustWindowRect(&rectangle, win32Style, C.FALSE)
left = C.int(rectangle.left)
top = C.int(rectangle.top)
width = C.int(rectangle.right - rectangle.left)
height = C.int(rectangle.bottom - rectangle.top)
}
wTitle, _ := utf16Convert(title)
wi.window.Handle = C.CreateWindowExW(0, className, wTitle, win32Style, left, top, width, height, nil, nil, windowClass.hInstance, C.LPVOID(wi))
// Switch to fullscreen if requested
if fullscreen {
wi.switchToFullscreen(monitor, mode)
}
return nil
}
func (ic *contextInternal) initializeFromOwner(settings ContextSettings, owner *windowInternal, bitsPerPixel uint) ThreadError {
ic.deactivateSignal = make(chan bool)
ic.settings = settings
// Get the owner window and its device context
ic.window = C.HWND(owner.window.Handle)
ic.ownsWindow = false
// get the device context
ic.hdc = C.GetDC(ic.window)
if ic.hdc == nil {
return NewThreadError(errors.New("no device context"), true)
}
ic.context = createContext(&sharedContext.internal.procs, sharedContext.internal.context, ic.hdc, bitsPerPixel, &ic.settings)
if ic.context == nil {
return NewThreadError(fmt.Errorf("could not create context (%d)", C.GetLastError()), true)
}
// signal because we start out deactivated
ic.signalDeactivation()
return nil
}