To do a "fake" fullscreen window in SDL2 without a modeset you can create a borderless, maximized window using something like this.
int idx = SDL_GetWindowDisplayIndex(g_displayWindow);
SDL_Rect bounds;
SDL_GetDisplayBounds(idx, &bounds);
//SDL_SetWindowResizable(g_displayWindow, SDL_FALSE);
SDL_SetWindowBordered(g_displayWindow, SDL_FALSE);
SDL_SetWindowPosition(g_displayWindow, bounds.x, bounds.y);
SDL_SetWindowSize(g_displayWindow, bounds.w, bounds.h);
For non-resizable windows, this works perfectly. On windows created with SDL_WINDOW_RESIZABLE there is an annoying grey border on the bottom and right edges of the screen (on windows). Unfortunately there isn't a SDL_SetWindowResizable function (as of SDL 2.0.4). How can we get rid of the resizing border without recreating the window?
SDL_WINDOW_FULLSCREEN_DESKTOP and SDL_WINDOW_FULLSCREEN both do a modeset which I want to avoid - it takes longer, it's harder to alt-tab out of, and if the game hits a breakpoint in the debugger it can lock up the whole system.
This is what I came up with - tested and works on windows.
void SDL_SetWindowResizable(SDL_Window *win, SDL_bool resizable)
{
SDL_SysWMinfo info;
SDL_VERSION(&info.version);
SDL_GetWindowWMInfo(g_displayWindow, &info);
#if WIN32
HWND hwnd = info.info.win.window;
DWORD style = GetWindowLong(hwnd, GWL_STYLE);
if (resizable)
style |= WS_THICKFRAME;
else
style &= ~WS_THICKFRAME;
SetWindowLong(hwnd, GWL_STYLE, style);
#endif
}
The SDL_SetWindowResizable() function was added in SDL 2.0.5 which was released in Oct 2016. Announcing SDL 2.0.5
Assuming your SDL_Window pointer (that you got from SDL_CreateWindow()) is named window, use:
/* To disable resizing: */
SDL_SetWindowResizable(window, SDL_FALSE);
/* To enable resizing: */
SDL_SetWindowResizable(window, SDL_TRUE);
Related
I am writing a C++ Windows program that displays game stats/friends info over games using a Win32 window and a DirectX11 renderer. (that renders a UI that is controlled with the mouse and keyboard)
The window is overlaid on top of the game’s window and has the flags WS_EX_TRANSPARENT and WS_POPUP set.
When the window is activated, I set WS_EX_LAYERED to capture inputs.
The created window is positioned on top of the target window if GetWindow(target_, GW_HWNDPREV) is different from the handle of the created window.
It is placed on top of it by calling SetWindowPos with SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE | SWP_ASYNCWINDOWPOS.
I’ve double-checked that the flags are set correctly and that the functions are being called.
I also tried using ShowWindow with the SW_SHOW flag, but the result remained unchanged.
I’m currently running my tests on Portal 2, but ideally, I would want this to work on the majority of games. (OS used is Windows 11 22H2)
To activate the window and release the mouse capture from the game, I am calling SetForegroundWindow, SetActiveWindow, and SetFocus, all with the HWND of my window.
This approach works correctly when I run the program from Visual Studio, but when I run the compiled executable, the mouse remains locked in the game.
Both builds were tested in debug and release mode, and I really can't figure out why this is happening.
LRESULT Renderer::WndProc(...) {
switch (message) {
case WM_SIZE:
// resize buffers and recreate render target view
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(handle, message, w_param, l_param);
}
bool Window::Create(...) {
// ...
hwnd_ = CreateWindowEx(
wndclass,
class_name_.c_str(),
title_.c_str(),
WS_POPUP,
0, 0, 10, 10,
nullptr,
nullptr,
nullptr,
nullptr
);
SetLayeredWindowAttributes(hwnd_, 0, 255, LWA_ALPHA);
UpdateWindow(hwnd_);
constexpr MARGINS margin = {-1, -1, -1, -1};
const auto result = DwmExtendFrameIntoClientArea(hwnd_, &margin);
// ...
}
void Window::Activate() {
// Remove the WS_EX_LAYERED attribute.
SetClickThrough(false);
SetForegroundWindow(hwnd_);
SetActiveWindow(hwnd_);
SetFocus(hwnd_);
}
// ----------------------
// Sample main routine pseudocode:
// ----------------------
renderer->window.Create(...);
while (renderer->is_running()) {
renderer->BeginFrame();
// Position the window on top of the game found.
renderer->window().FollowTarget();
// Toggle the visibility using the F2 key.
// If transitioning from hidden to visible, call the window
// activation routine.
if (utils::KeyPressed(VK_F2)) {
if (ui->is_visible()) {
// .. window deactivation not included
ui->set_visible(false);
}
else {
renderer->window().Activate();
ui->set_visible(true);
}
}
ui->Draw(renderer);
renderer->Present();
}
I considered using a low-level keyboard/mouse hook to capture inputs, or offscreen rendering and presenting it in the game using a DirectX hook, but I’d rather avoid it as it would require many games to manually whitelist it.
Is there something else I’m missing or a different approach I should be taking?
For my Console Application, I needed to prevent user input and window resizing. I used
HWND consoleWindow = GetConsoleWindow();
SetWindowLong(consoleWindow, GWL_STYLE, GetWindowLong(consoleWindow, GWL_STYLE) & ~WS_MAXIMIZEBOX & ~WS_SIZEBOX);
and
void disableInput()
{
DWORD prev_mode;
GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &prev_mode);
SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_EXTENDED_FLAGS |
(prev_mode & ~ENABLE_QUICK_EDIT_MODE));
}
However, after finishing the program, it would be nice to enable these settings again.
I think this
void enableInput()
{
DWORD prev_mode;
GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &prev_mode);
SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_QUICK_EDIT_MODE | ENABLE_EXTENDED_FLAGS);
}
should work for the input but how do I enable window resizing again?
Also, a little bit off this topic but how to enable/disable console resizing and input for Linux?
I have a function that sets a Win32 console to full screen. The problem is when it goes into full screen, it's not hiding the mouse cursor.
It doesn't seem to matter if it's in full screen or not. The mouse cursor still shows when I call ShowCursor(FALSE). How can it be hidden?
As in the docs for ShowCursor(), the cursor will hide if the function returns a value greater than 0. If it's negative, it will hide. The value is returning -2 for me, so it should hide in this case, but it is not.
bool Console::setFullScreen(const bool fullScreen)
{
HWND handle;
if (fullScreen)
{
// Hide the scrollbar
showScrollBar(false);
// Set the window style
handle = GetConsoleWindow();
LONG style = GetWindowLong(handle, GWL_STYLE);
style &= ~(WS_BORDER | WS_CAPTION | WS_THICKFRAME);
SetWindowLong(handle, GWL_STYLE, style);
// Set the window to full screen in windowed mode
ShowWindow(getHandle(), SW_MAXIMIZE);
// Hide the cursor
ShowCursor(FALSE); // Fails
}
else
{
showScrollBar(true);
// Set the window style
handle = GetConsoleWindow();
LONG style = GetWindowLong(handle, GWL_STYLE);
style |= WS_BORDER;
style |= WS_CAPTION;
style |= WS_THICKFRAME;
SetWindowLong(handle, GWL_STYLE, style);
// Set the window to full screen in windowed mode
ShowWindow(getHandle(), SW_NORMAL);
// Show the cursor
ShowCursor(TRUE);
}
return true;
}
I haven't tried this, but you can probably change the mouse cursor of the console window by calling GetConsoleWindow to get the HWND of the console window, then calling SetClassLong to set the cursor.
HCURSOR hNewCursor = LoadCursor(/* whatever*/);
SetClassLong(GetConsoleWindow(), GCL_HCURSOR, hNewCursor);
To make the cursor disappear, create a cursor which is entirely transparent.
I register the window class like this:
WNDCLASSEX wctt;
wctt.cbSize = sizeof(WNDCLASSEX);
wctt.style = CS_DBLCLKS;
wctt.lpfnWndProc = WndProcTooltip;
wctt.cbClsExtra = 0;
wctt.cbWndExtra = 0;
wctt.hInstance = m_hAppInstance;
wctt.hIcon = NULL;
wctt.hCursor = LoadCursor(NULL, IDC_SIZE);
wctt.hbrBackground = NULL;
wctt.lpszMenuName = NULL;
wctt.lpszClassName = _T("myWindow");
wctt.hIconSm = NULL;
RegisterClassEx(&wctt)
As you can see I use wctt.hbrBackground = NULL; so it will have no background.
The window is created like this:
::CreateWindowEx(WS_EX_TOPMOST | WS_EX_TOOLWINDOW,
_T("myWindow"),
NULL,
WS_VISIBLE | WS_POPUP,
50,
50,
150,
100,
NULL,
NULL,
m_hAppInstance,
NULL);
In the paint section I draw icon on the window:
PAINTSTRUCT ps;
HDC hdc;
BITMAP bitmap;
ICONINFO iconinfo;
hdc = ::BeginPaint(hWnd, &ps);
::SetBkMode(hdc,TRANSPARENT);
::GetIconInfo(localIcon, &iconinfo);
::GetObject(iconinfo.hbmColor, sizeof(bitmap), &bitmap);
::DeleteObject(iconinfo.hbmColor);
::DeleteObject(iconinfo.hbmMask);
::DrawIconEx(hdc, 0,0, localIcon, bitmap.bmWidth, bitmap.bmHeight, 0, NULL, DI_NORMAL);
The icon size is smaller than the window size and I get on the background the current view on the window below the popup.
But now when I move the window (or minimize the window below the popup) the background is not changing.
I was trying to make a timer that each time do the flowing:
RECT rcClient;
GetClientRect(hWnd, &rcClient);
InvalidateRect(hWnd,&rcClient,TRUE);
This makes the print function run again but the background of the icon is not changing.
Should I do anything in WM_ERASEBKGND?
Does Anyone have any idea how to make it work?
thanks,
guy
It's not enough to just let the background stay unpainted; you also need to get the window below yours to repaint itself when necessary.
If the windows are part of the same hierarchy, created by the same thread, it is sufficient to give your window the WS_EX_TRANSPARENT extended style. This causes the window underneath to paint itself first so the background is always up-to-date.
Otherwise you need to use SetWindowRgn so that your window actually doesn't exist outside of the borders you wish to paint.
Look at Layered Window. This feature allows creating semi-transparent windows of different shapes.
Add WS_EX_LAYERED extended attribute in your window class.
You can control the transparency of your window with these two functions:
SetLayeredWindowAttributes:
bAlpha controls the opacity of the entire window, if you pass LWA_ALPHA in dwFlags.
When bAlpha is 0, the window is completely transparent. When bAlpha is 255, the window is opaque.
crKey sets the color that would transparent.
All pixels painted by the window in this color will be transparent.
UpdateLayeredWindow gives you precise control over window transparency, you can give different parts of window different levels of transparency.
If you're trying to create a non-rectangular window, this is not sufficient. Setting "no background" simply means the background will not be drawn, and you'll see whatever happens to be in memory at that location.
To create a non-rectangular window, have a look at the SetWindowRgn function.
So I've got an OpenGL application running that can toggle between fullscreen mode and windowed mode. It currently does this by resizing the window and changing styles.
However, it seems to not invalidate the screen when switching from fullscreen mode to windowed mode, which leaves things I've drawn lingering onscreen after the switch.
Interestingly, it only exhibits this behavior in single monitor mode. If I'm running with multiple monitors, it invalidates okay, and clears my drawing.
I don't think this is a driver bug, as it's happening on two separate computers using two separate video cards(although admittedly they are both nVidia.), I'm thinking I'm doing something wrong somewhere.
I've tried a bunch of methods for getting Windows to clear the screen of my previously fullscreen drawings, but nothing seems to work. InvalidateRect(), RedrawWindow(), ChangeDisplaySettings()...
Specifically:
InvalidateRect(m_hwnd, &rectx, true); // rect being the dimensions of either the screen or my window.
InvalidateRect(HWND_DESKTOP, NULL, TRUE); // Doesn't seem to do anything.
RedrawWindow(NULL, NULL, NULL, RDW_INVALIDATE | RDW_ALLCHILDREN | RDW_UPDATENOW);
ChangeDisplaySettings(NULL, 0);
Well, actually, one thing that does seem to work is ShowWindow(hwnd, SW_HIDE) before resizing. However that loses focus for a moment, allowing other applications to grab my application's input, and seems a bad way to go about it.
I should note that I'm not doing any actual display mode changes when I'm seeing this behavior; just staying at the current resolution for fullscreen.
I'm a bit clueless where I'm going wrong. Simplified code:
if(m_isFullscreen)
{
ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN);
}
else
{
ChangeDisplaySettings(&m_dmSavedScreenSettings, 0);
}
if(m_isFullscreen)
{
dwExStyle = WS_EX_APPWINDOW;
dwStyle = WS_POPUP;
ShowCursor(false);
}
else
{
dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
dwStyle = WS_OVERLAPPEDWINDOW;
if(m_isRunning) // Because ShowCursor uses a counter to indicate, and windowed mode defaults to cursor on, we don't need to increment the counter and double it being on.
{
ShowCursor(true);
}
}
RECT rect;
rect.left = 0;
rect.top = 0;
if(m_isFullscreen) { rect.right = 1280; } else { rect.right = 640; }
if(m_isFullscreen) { rect.bottom = 1024; } else { rect.bottom = 480; }
AdjustWindowRectEx(&rect, dwStyle, false, dwExStyle);
SetWindowLongPtr(m_hwnd, GWL_STYLE, dwStyle | WS_CLIPCHILDREN | WS_CLIPSIBLINGS);
SetWindowLongPtr(m_hwnd, GWL_EXSTYLE, dwExStyle);
if(m_isFullscreen)
{
MoveWindow(m_hwnd, 0, 0, 1280, 1024, true);
}
else
{
MoveWindow(m_hwnd, 0, 0, 640, 480, true); // windowed
}
And that's more or less it. Some other supporting code and error checking, but that's what I'm doing... dmSavedSettings is saved before m_hwnd is assigned from NULL, and not afterwards. My initial window creation works fine, and fullscreen works fine. It's just returning to Windowed after being fullscreen that's the issue.
If you set a null background brush in your window class, windows will not be cleared automatically. You must add a WM_PAINT handler that calls your OpenGL display handler, which in turn clears the viewport (glClearColor) and redraws.
As datenwolf mentions in another answer's comment, you want to use SetWindowPos() instead of MoveWindow() when making use of SetWindowLongPtr().
My dirty background problems were solved by calling ChangeDisplaySettings(NULL, 0) AFTER resizing my window. Doing it before does little, but afterwards appears to work fine.