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This can leave the window displaying out-of-date contents, which might never be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