xorg-x11-server-Xwayland/SOURCES/0022-xwayland-eglstream-flush-stream-after-eglSwapBuffers.patch

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From 29cba30948cda34e744314343109964ff9ed515c Mon Sep 17 00:00:00 2001
From: Erik Kurzinger <ekurzinger@nvidia.com>
Date: Tue, 11 May 2021 17:00:21 -0400
Subject: [PATCH xserver 22/27] xwayland/eglstream: flush stream after
eglSwapBuffers
When eglSwapBuffers inserts a new frame into a window's stream, there may be a
delay before the state of the consumer end of the stream is updated to reflect
this. If the subsequent wl_surface_attach, wl_surface_damage, wl_surface_commit
calls are received by the compositor before then, it will (typically) re-use
the previous frame acquired from the stream instead of the latest one.
This can leave the window displaying out-of-date contents, which might never be
updated thereafter.
To fix this, after calling eglSwapBuffers, xwl_glamor_eglstream_post_damage
should call eglStreamFlushNV. This call will block until it can be guaranteed
that the state of the consumer end of the stream has been updated to reflect
that a new frame is available.
Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1171
Signed-off-by: Erik Kurzinger <ekurzinger@nvidia.com>
(cherry picked from commit 7515c23a416825f0db51f9b445279b12d5918ebf)
---
hw/xwayland/xwayland-glamor-eglstream.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/hw/xwayland/xwayland-glamor-eglstream.c b/hw/xwayland/xwayland-glamor-eglstream.c
index 2d0827709..c583a1390 100644
--- a/hw/xwayland/xwayland-glamor-eglstream.c
+++ b/hw/xwayland/xwayland-glamor-eglstream.c
@@ -72,6 +72,7 @@ struct xwl_eglstream_private {
SetWindowPixmapProcPtr SetWindowPixmap;
Bool have_egl_damage;
+ Bool have_egl_stream_flush;
GLint blit_prog;
GLuint blit_vao;
@@ -776,6 +777,13 @@ xwl_glamor_eglstream_post_damage(struct xwl_window *xwl_window,
goto out;
}
+#ifdef EGL_NV_stream_flush
+ if (xwl_eglstream->have_egl_stream_flush)
+ /* block until stream state is updated on the compositor's side */
+ eglStreamFlushNV(xwl_screen->egl_display,
+ xwl_pixmap->stream);
+#endif
+
if (!xwl_pixmap->wait_for_buffer_release) {
/* hang onto the pixmap until the compositor has released it */
pixmap->refcnt++;
@@ -1173,6 +1181,18 @@ xwl_glamor_eglstream_init_egl(struct xwl_screen *xwl_screen)
ErrorF("Driver lacks EGL_KHR_swap_buffers_with_damage, performance "
"will be affected\n");
+#ifdef EGL_NV_stream_flush
+ xwl_eglstream->have_egl_stream_flush =
+ epoxy_has_egl_extension(xwl_screen->egl_display,
+ "EGL_NV_stream_flush");
+#else
+ xwl_eglstream->have_egl_stream_flush = FALSE;
+#endif /* EGL_NV_stream_flush */
+
+ if (!xwl_eglstream->have_egl_stream_flush)
+ ErrorF("EGL_NV_stream_flush not available, "
+ "this may cause visible corruption.\n");
+
xwl_eglstream_init_shaders(xwl_screen);
if (epoxy_has_gl_extension("GL_OES_EGL_image") &&
--
2.31.1