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wayland: Add a hint to disable video mode emulation under Wayland

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Add the hint "SDL_VIDEO_WAYLAND_MODE_EMULATION", which can be used to disable mode emulation under Wayland. When disabled, only the desktop and/or native display resolution is exposed.
This commit is contained in:
Frank Praznik 2022-05-15 10:35:59 -04:00 committed by Sam Lantinga
parent e9d3dcea73
commit e1c8350439
2 changed files with 20 additions and 4 deletions
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15
include/SDL_hints.h
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@ -1508,6 +1508,21 @@ extern "C" {
*/
#define SDL_HINT_VIDEO_WAYLAND_PREFER_LIBDECOR "SDL_VIDEO_WAYLAND_PREFER_LIBDECOR"
/**
* \brief A variable controlling whether video mode emulation is enabled under Wayland.
*
* When this hint is set, a standard set of emulated CVT video modes will be exposed for use by the application.
* If it is disabled, the only modes exposed will be the logical desktop size and, in the case of a scaled
* desktop, the native display resolution.
*
* This variable can be set to the following values:
* "0" - Video mode emulation is disabled.
* "1" - Video mode emulation is enabled.
*
* By default video mode emulation is enabled.
*/
#define SDL_HINT_VIDEO_WAYLAND_MODE_EMULATION "SDL_VIDEO_WAYLAND_MODE_EMULATION"
/**
* \brief A variable that is the address of another SDL_Window* (as a hex string formatted with "%p").
*

9
src/video/wayland/SDL_waylandvideo.c
View file

@ -545,6 +545,7 @@ display_handle_done(void *data,
SDL_VideoData* video = driverdata->videodata;
SDL_DisplayMode native_mode, desktop_mode;
SDL_VideoDisplay *dpy;
const SDL_bool mode_emulation_enabled = SDL_GetHintBoolean(SDL_HINT_VIDEO_WAYLAND_MODE_EMULATION, SDL_TRUE);
/*
* When using xdg-output, two wl-output.done events will be emitted:
@ -597,8 +598,8 @@ display_handle_done(void *data,
desktop_mode.driverdata = driverdata->output;
/*
* The native display mode is only exposed separately from the desktop size if:
* the desktop is scaled and the wp_viewporter protocol is supported.
* The native display mode is only exposed separately from the desktop size if the
* desktop is scaled and the wp_viewporter protocol is supported.
*/
if (driverdata->scale_factor > 1.0f && video->viewporter != NULL) {
if (driverdata->index > -1) {
@ -643,8 +644,8 @@ display_handle_done(void *data,
SDL_SetCurrentDisplayMode(dpy, &desktop_mode);
SDL_SetDesktopDisplayMode(dpy, &desktop_mode);
/* Add emulated modes if wp_viewporter is supported. */
if (video->viewporter) {
/* Add emulated modes if wp_viewporter is supported and mode emulation is enabled. */
if (video->viewporter && mode_emulation_enabled) {
AddEmulatedModes(dpy, (driverdata->transform & WL_OUTPUT_TRANSFORM_90) != 0);
}