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Add SDL_VIDEO_DOUBLE_BUFFER support to the Wayland backend.

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(cherry picked from commit 9e6b8d56e3)
This commit is contained in:
vanfanel 2024-07-17 20:40:30 +02:00 • committed by Sam Lantinga
parent 00a7191f67
commit 1df907b1ba
4 changed files with 28 additions and 5 deletions
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1
include/SDL_hints.h
View file

@ -1912,6 +1912,7 @@ extern "C" {
* Since it's driver-specific, it's only supported where possible and
* implemented. Currently supported the following drivers:
*
* - Wayland (wayland)
* - KMSDRM (kmsdrm)
* - Raspberry Pi (raspberrypi)
*/

26
src/video/wayland/SDL_waylandopengles.c
View file

@ -120,6 +120,20 @@ int Wayland_GLES_SwapWindow(_THIS, SDL_Window *window)
return 0;
}
/* By default, we wait for Wayland frame callback and then issue pageflip (eglSwapBuffers),
* but if we want low latency (double buffer scheme), we issue the pageflip
* and then wait immediately for Wayland frame callback.
*/
if (data->double_buffer) {
/* Feed the frame to Wayland. This will set it so the wl_surface_frame callback can fire again. */
if (!_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, data->egl_surface)) {
return SDL_EGL_SetError("unable to show color buffer in an OS-native window", "eglSwapBuffers");
}
WAYLAND_wl_display_flush(data->waylandData->display);
}
/* Control swap interval ourselves. See comments on Wayland_GLES_SetSwapInterval */
if (swap_interval != 0) {
SDL_VideoData *videodata = (SDL_VideoData *)_this->driverdata;
@ -162,12 +176,14 @@ int Wayland_GLES_SwapWindow(_THIS, SDL_Window *window)
SDL_AtomicSet(&data->swap_interval_ready, 0);
}
/* Feed the frame to Wayland. This will set it so the wl_surface_frame callback can fire again. */
if (!_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, data->egl_surface)) {
return SDL_EGL_SetError("unable to show color buffer in an OS-native window", "eglSwapBuffers");
}
if (!data->double_buffer) {
/* Feed the frame to Wayland. This will set it so the wl_surface_frame callback can fire again. */
if (!_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, data->egl_surface)) {
return SDL_EGL_SetError("unable to show color buffer in an OS-native window", "eglSwapBuffers");
}
WAYLAND_wl_display_flush(data->waylandData->display);
WAYLAND_wl_display_flush(data->waylandData->display);
}
return 0;
}

5
src/video/wayland/SDL_waylandwindow.c
View file

@ -2023,6 +2023,11 @@ int Wayland_CreateWindow(_THIS, SDL_Window *window)
}
}
data->double_buffer = SDL_FALSE;
if (SDL_GetHintBoolean(SDL_HINT_VIDEO_DOUBLE_BUFFER, SDL_FALSE)) {
data->double_buffer = SDL_TRUE;
}
data->outputs = NULL;
data->num_outputs = 0;

1
src/video/wayland/SDL_waylandwindow.h
View file

@ -116,6 +116,7 @@ typedef struct
SDL_bool is_fullscreen;
SDL_bool in_fullscreen_transition;
Uint32 fullscreen_flags;
SDL_bool double_buffer;
} SDL_WindowData;
extern void Wayland_ShowWindow(_THIS, SDL_Window *window);