From 4d1005e3b86050f8b5bab41baf08704117f89b21 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Thu, 11 Feb 2016 15:06:23 -0500
Subject: [PATCH 1/7] CoglGPUInfo - fix check for NVIDIA
NVIDIA drivers have a vendor of "NVIDIA Corporation" not "NVIDIA".
Check for both in case older drivers did use "NVIDIA"
https://bugzilla.gnome.org/show_bug.cgi?id=779039
---
cogl/cogl/cogl-gpu-info.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/cogl/cogl/cogl-gpu-info.c b/cogl/cogl/cogl-gpu-info.c
index 845382881..23a846616 100644
--- a/cogl/cogl/cogl-gpu-info.c
+++ b/cogl/cogl/cogl-gpu-info.c
@@ -169,7 +169,8 @@ check_qualcomm_vendor (const CoglGpuInfoStrings *strings)
static CoglBool
check_nvidia_vendor (const CoglGpuInfoStrings *strings)
{
- if (strcmp (strings->vendor_string, "NVIDIA") != 0)
+ if (strcmp (strings->vendor_string, "NVIDIA") != 0 &&
+ strcmp (strings->vendor_string, "NVIDIA Corporation") != 0)
return FALSE;
return TRUE;
--
2.12.0
From 62a66bddf3aba14e65ab913746237d3d19a502dd Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Thu, 11 Feb 2016 16:33:03 -0500
Subject: [PATCH 2/7] CoglWinsysGLX: factor out some duplicated code
Add a helper function for repeated calls to clock_gettime(CLOCK_MONOTONIC)
https://bugzilla.gnome.org/show_bug.cgi?id=779039
---
cogl/cogl/winsys/cogl-winsys-glx.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/cogl/cogl/winsys/cogl-winsys-glx.c b/cogl/cogl/winsys/cogl-winsys-glx.c
index c50db3a04..379658e8a 100644
--- a/cogl/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/cogl/winsys/cogl-winsys-glx.c
@@ -192,6 +192,15 @@ find_onscreen_for_xid (CoglContext *context, uint32_t xid)
return NULL;
}
+static int64_t
+get_monotonic_time_ns (void)
+{
+ struct timespec ts;
+
+ clock_gettime (CLOCK_MONOTONIC, &ts);
+ return ts.tv_sec * G_GINT64_CONSTANT (1000000000) + ts.tv_nsec;
+}
+
static void
ensure_ust_type (CoglRenderer *renderer,
GLXDrawable drawable)
@@ -202,7 +211,6 @@ ensure_ust_type (CoglRenderer *renderer,
int64_t msc;
int64_t sbc;
struct timeval tv;
- struct timespec ts;
int64_t current_system_time;
int64_t current_monotonic_time;
@@ -232,9 +240,7 @@ ensure_ust_type (CoglRenderer *renderer,
/* This is the time source that the newer (fixed) linux drm
* drivers use (Linux >= 3.8) */
- clock_gettime (CLOCK_MONOTONIC, &ts);
- current_monotonic_time = (ts.tv_sec * G_GINT64_CONSTANT (1000000)) +
- (ts.tv_nsec / G_GINT64_CONSTANT (1000));
+ current_monotonic_time = get_monotonic_time_ns () / 1000;
if (current_monotonic_time > ust - 1000000 &&
current_monotonic_time < ust + 1000000)
@@ -310,10 +316,7 @@ _cogl_winsys_get_clock_time (CoglContext *context)
}
case COGL_GLX_UST_IS_MONOTONIC_TIME:
{
- struct timespec ts;
-
- clock_gettime (CLOCK_MONOTONIC, &ts);
- return ts.tv_sec * G_GINT64_CONSTANT (1000000000) + ts.tv_nsec;
+ return get_monotonic_time_ns ();
}
}
@@ -1682,16 +1685,13 @@ _cogl_winsys_wait_for_vblank (CoglOnscreen *onscreen)
else
{
uint32_t current_count;
- struct timespec ts;
glx_renderer->glXGetVideoSync (¤t_count);
glx_renderer->glXWaitVideoSync (2,
(current_count + 1) % 2,
¤t_count);
- clock_gettime (CLOCK_MONOTONIC, &ts);
- info->presentation_time =
- ts.tv_sec * G_GINT64_CONSTANT (1000000000) + ts.tv_nsec;
+ info->presentation_time = get_monotonic_time_ns ();
}
}
}
--
2.12.0
From 69e156c91c663e6f41759eec9f7c729a67da7dc5 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Thu, 11 Feb 2016 17:04:08 -0500
Subject: [PATCH 3/7] Usability of SGI_video_sync is per-display not
per-renderer
As previously commented in the code, SGI_video_sync is per-display, rather
than per-renderer. The is_direct flag for the renderer was tested before
it was initialized (per-display) and that resulted in SGI_video_sync
never being used.
https://bugzilla.gnome.org/show_bug.cgi?id=779039
---
cogl/cogl/cogl-glx-display-private.h | 3 ++
cogl/cogl/cogl-glx-renderer-private.h | 2 --
cogl/cogl/winsys/cogl-winsys-glx.c | 52 +++++++++++++++++++----------------
3 files changed, 31 insertions(+), 26 deletions(-)
diff --git a/cogl/cogl/cogl-glx-display-private.h b/cogl/cogl/cogl-glx-display-private.h
index 133c1188c..1d1afc0cf 100644
--- a/cogl/cogl/cogl-glx-display-private.h
+++ b/cogl/cogl/cogl-glx-display-private.h
@@ -51,6 +51,9 @@ typedef struct _CoglGLXDisplay
CoglBool found_fbconfig;
CoglBool fbconfig_has_rgba_visual;
+ CoglBool is_direct;
+ CoglBool have_vblank_counter;
+ CoglBool can_vblank_wait;
GLXFBConfig fbconfig;
/* Single context for all wins */
diff --git a/cogl/cogl/cogl-glx-renderer-private.h b/cogl/cogl/cogl-glx-renderer-private.h
index cb8ff97f8..061f2ccb5 100644
--- a/cogl/cogl/cogl-glx-renderer-private.h
+++ b/cogl/cogl/cogl-glx-renderer-private.h
@@ -43,8 +43,6 @@ typedef struct _CoglGLXRenderer
int glx_error_base;
int glx_event_base;
- CoglBool is_direct;
-
/* Vblank stuff */
int dri_fd;
diff --git a/cogl/cogl/winsys/cogl-winsys-glx.c b/cogl/cogl/winsys/cogl-winsys-glx.c
index 379658e8a..5a2700176 100644
--- a/cogl/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/cogl/winsys/cogl-winsys-glx.c
@@ -715,23 +715,25 @@ update_base_winsys_features (CoglRenderer *renderer)
g_strfreev (split_extensions);
- /* Note: the GLX_SGI_video_sync spec explicitly states this extension
- * only works for direct contexts. */
- if (!glx_renderer->is_direct)
- {
- glx_renderer->glXGetVideoSync = NULL;
- glx_renderer->glXWaitVideoSync = NULL;
- COGL_FLAGS_SET (glx_renderer->base_winsys_features,
- COGL_WINSYS_FEATURE_VBLANK_COUNTER,
- FALSE);
- }
+ /* The GLX_SGI_video_sync spec explicitly states this extension
+ * only works for direct contexts; we don't know per-renderer
+ * if the context is direct or not, so we turn off the feature
+ * flag; we still use the extension within this file looking
+ * instead at glx_display->have_vblank_counter.
+ */
+ COGL_FLAGS_SET (glx_renderer->base_winsys_features,
+ COGL_WINSYS_FEATURE_VBLANK_COUNTER,
+ FALSE);
+
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN,
TRUE);
- if (glx_renderer->glXWaitVideoSync ||
- glx_renderer->glXWaitForMsc)
+ /* Because of the direct-context dependency, the VBLANK_WAIT feature
+ * doesn't reflect the presence of GLX_SGI_video_sync.
+ */
+ if (glx_renderer->glXWaitForMsc)
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
COGL_WINSYS_FEATURE_VBLANK_WAIT,
TRUE);
@@ -864,7 +866,7 @@ update_winsys_features (CoglContext *context, CoglError **error)
* by the SwapInterval so we have to throttle swap_region requests
* manually... */
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_REGION) &&
- _cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT))
+ (glx_display->have_vblank_counter || glx_display->can_vblank_wait))
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE, TRUE);
@@ -1142,11 +1144,13 @@ create_context (CoglDisplay *display, CoglError **error)
return FALSE;
}
- glx_renderer->is_direct =
+ glx_display->is_direct =
glx_renderer->glXIsDirect (xlib_renderer->xdpy, glx_display->glx_context);
+ glx_display->have_vblank_counter = glx_display->is_direct && glx_renderer->glXWaitVideoSync;
+ glx_display->can_vblank_wait = glx_renderer->glXWaitForMsc || glx_display->have_vblank_counter;
COGL_NOTE (WINSYS, "Setting %s context",
- glx_renderer->is_direct ? "direct" : "indirect");
+ glx_display->is_direct ? "direct" : "indirect");
/* XXX: GLX doesn't let us make a context current without a window
* so we create a dummy window that we can use while no CoglOnscreen
@@ -1658,12 +1662,13 @@ _cogl_winsys_wait_for_vblank (CoglOnscreen *onscreen)
CoglContext *ctx = framebuffer->context;
CoglGLXRenderer *glx_renderer;
CoglXlibRenderer *xlib_renderer;
+ CoglGLXDisplay *glx_display;
glx_renderer = ctx->display->renderer->winsys;
xlib_renderer = _cogl_xlib_renderer_get_data (ctx->display->renderer);
+ glx_display = ctx->display->winsys;
- if (glx_renderer->glXWaitForMsc ||
- glx_renderer->glXGetVideoSync)
+ if (glx_display->can_vblank_wait)
{
CoglFrameInfo *info = g_queue_peek_tail (&onscreen->pending_frame_infos);
@@ -1759,6 +1764,7 @@ _cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
+ CoglGLXDisplay *glx_display = context->display->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
GLXDrawable drawable =
@@ -1815,9 +1821,8 @@ _cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
if (framebuffer->config.swap_throttled)
{
- have_counter =
- _cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_COUNTER);
- can_wait = _cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT);
+ have_counter = glx_display->have_vblank_counter;
+ can_wait = glx_display->can_vblank_wait;
}
else
{
@@ -1974,6 +1979,7 @@ _cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
+ CoglGLXDisplay *glx_display = context->display->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglBool have_counter;
@@ -1993,8 +1999,7 @@ _cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
{
uint32_t end_frame_vsync_counter = 0;
- have_counter =
- _cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_COUNTER);
+ have_counter = glx_display->have_vblank_counter;
/* If the swap_region API is also being used then we need to track
* the vsync counter for each swap request so we can manually
@@ -2004,8 +2009,7 @@ _cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
if (!glx_renderer->glXSwapInterval)
{
- CoglBool can_wait =
- _cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT);
+ CoglBool can_wait = glx_display->can_vblank_wait;
/* If we are going to wait for VBLANK manually, we not only
* need to flush out pending drawing to the GPU before we
--
2.12.0
From 55b8900c1d66a4568ff261a0498d12ca857d2431 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Thu, 11 Feb 2016 17:12:09 -0500
Subject: [PATCH 4/7] Fix the get_clock_time() without GLX_OML_sync_control
When we don't have GLX_OML_sync_control, we still can set the
frame presentation time, but we always use the system monotonic time,
so return that from get_clock_time().
https://bugzilla.gnome.org/show_bug.cgi?id=779039
---
cogl/cogl/winsys/cogl-winsys-glx.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/cogl/cogl/winsys/cogl-winsys-glx.c b/cogl/cogl/winsys/cogl-winsys-glx.c
index 5a2700176..7ad1a3fdf 100644
--- a/cogl/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/cogl/winsys/cogl-winsys-glx.c
@@ -296,6 +296,9 @@ _cogl_winsys_get_clock_time (CoglContext *context)
{
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
+ if (!glx_renderer->glXWaitForMsc)
+ return get_monotonic_time_ns ();
+
/* We don't call ensure_ust_type() because we don't have a drawable
* to work with. cogl_get_clock_time() is documented to only work
* once a valid, non-zero, timestamp has been retrieved from Cogl.
--
2.12.0
From cb784a7be6c72453bc441f03ced27a531ee687d5 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Thu, 11 Feb 2016 17:15:13 -0500
Subject: [PATCH 5/7] For NVIDIA proprietary drivers, implement sync events
with a thread
It's a good guess that the buffer swap will occur at the next vblank,
so use glXWaitVideoSync in a separate thread to deliver a sync event
rather than just letting the client block when frame drawing, which
can signficantly change app logic as compared to the INTEL_swap_event
case.
https://bugzilla.gnome.org/show_bug.cgi?id=779039
---
cogl/cogl/cogl-private.h | 3 +
cogl/cogl/winsys/cogl-winsys-glx.c | 294 +++++++++++++++++++++++++++++++++++--
2 files changed, 286 insertions(+), 11 deletions(-)
diff --git a/cogl/cogl/cogl-private.h b/cogl/cogl/cogl-private.h
index 333955c65..e5dc9feda 100644
--- a/cogl/cogl/cogl-private.h
+++ b/cogl/cogl/cogl-private.h
@@ -77,6 +77,9 @@ typedef enum
COGL_PRIVATE_FEATURE_GL_PROGRAMMABLE,
COGL_PRIVATE_FEATURE_GL_EMBEDDED,
COGL_PRIVATE_FEATURE_GL_WEB,
+ /* This is currently only implemented for GLX, but isn't actually
+ * that winsys dependent */
+ COGL_PRIVATE_FEATURE_THREADED_SWAP_WAIT,
COGL_N_PRIVATE_FEATURES
} CoglPrivateFeature;
diff --git a/cogl/cogl/winsys/cogl-winsys-glx.c b/cogl/cogl/winsys/cogl-winsys-glx.c
index 7ad1a3fdf..1418d1501 100644
--- a/cogl/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/cogl/winsys/cogl-winsys-glx.c
@@ -65,12 +65,16 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
+#include <errno.h>
#include <fcntl.h>
#include <time.h>
+#include <unistd.h>
#include <GL/glx.h>
#include <X11/Xlib.h>
+#include <glib.h>
+
/* This is a relatively new extension */
#ifndef GLX_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV
#define GLX_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV 0x20F7
@@ -100,6 +104,14 @@ typedef struct _CoglOnscreenGLX
CoglBool pending_sync_notify;
CoglBool pending_complete_notify;
CoglBool pending_resize_notify;
+
+ GThread *swap_wait_thread;
+ GQueue *swap_wait_queue;
+ GCond swap_wait_cond;
+ GMutex swap_wait_mutex;
+ int swap_wait_pipe[2];
+ GLXContext swap_wait_context;
+ CoglBool closing_down;
} CoglOnscreenGLX;
typedef struct _CoglPixmapTextureEyeGLX
@@ -885,6 +897,28 @@ update_winsys_features (CoglContext *context, CoglError **error)
COGL_FEATURE_ID_PRESENTATION_TIME,
TRUE);
}
+ else
+ {
+ CoglGpuInfo *info = &context->gpu;
+ if (glx_display->have_vblank_counter &&
+ info->vendor == COGL_GPU_INFO_VENDOR_NVIDIA)
+ {
+ COGL_FLAGS_SET (context->winsys_features,
+ COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT, TRUE);
+ COGL_FLAGS_SET (context->winsys_features,
+ COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT, TRUE);
+ /* TODO: remove this deprecated feature */
+ COGL_FLAGS_SET (context->features,
+ COGL_FEATURE_ID_SWAP_BUFFERS_EVENT,
+ TRUE);
+ COGL_FLAGS_SET (context->features,
+ COGL_FEATURE_ID_PRESENTATION_TIME,
+ TRUE);
+ COGL_FLAGS_SET (context->private_features,
+ COGL_PRIVATE_FEATURE_THREADED_SWAP_WAIT,
+ TRUE);
+ }
+ }
/* We'll manually handle queueing dirty events in response to
* Expose events from X */
@@ -1481,7 +1515,8 @@ _cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
}
#ifdef GLX_INTEL_swap_event
- if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT))
+ if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT) &&
+ !_cogl_has_private_feature (context, COGL_PRIVATE_FEATURE_THREADED_SWAP_WAIT))
{
GLXDrawable drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
@@ -1524,6 +1559,31 @@ _cogl_winsys_onscreen_deinit (CoglOnscreen *onscreen)
xlib_onscreen->output = NULL;
}
+ if (glx_onscreen->swap_wait_thread)
+ {
+ g_mutex_lock (&glx_onscreen->swap_wait_mutex);
+ glx_onscreen->closing_down = TRUE;
+ g_cond_signal (&glx_onscreen->swap_wait_cond);
+ g_mutex_unlock (&glx_onscreen->swap_wait_mutex);
+ g_thread_join (glx_onscreen->swap_wait_thread);
+ glx_onscreen->swap_wait_thread = NULL;
+
+ g_cond_clear (&glx_onscreen->swap_wait_cond);
+ g_mutex_clear (&glx_onscreen->swap_wait_mutex);
+
+ g_queue_free (glx_onscreen->swap_wait_queue);
+ glx_onscreen->swap_wait_queue = NULL;
+
+ _cogl_poll_renderer_remove_fd (context->display->renderer,
+ glx_onscreen->swap_wait_pipe[0]);
+
+ close (glx_onscreen->swap_wait_pipe[0]);
+ close (glx_onscreen->swap_wait_pipe[1]);
+
+ glx_renderer->glXDestroyContext (xlib_renderer->xdpy,
+ glx_onscreen->swap_wait_context);
+ }
+
_cogl_xlib_renderer_trap_errors (context->display->renderer, &old_state);
drawable =
@@ -1757,6 +1817,199 @@ set_frame_info_output (CoglOnscreen *onscreen,
}
}
+static gpointer
+threaded_swap_wait (gpointer data)
+{
+ CoglOnscreen *onscreen = data;
+
+ CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
+
+ CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
+ CoglContext *context = framebuffer->context;
+ CoglDisplay *display = context->display;
+ CoglXlibRenderer *xlib_renderer = _cogl_xlib_renderer_get_data (display->renderer);
+ CoglGLXDisplay *glx_display = display->winsys;
+ CoglGLXRenderer *glx_renderer = display->renderer->winsys;
+ GLXDrawable dummy_drawable;
+
+ if (glx_display->dummy_glxwin)
+ dummy_drawable = glx_display->dummy_glxwin;
+ else
+ dummy_drawable = glx_display->dummy_xwin;
+
+ glx_renderer->glXMakeContextCurrent (xlib_renderer->xdpy,
+ dummy_drawable,
+ dummy_drawable,
+ glx_onscreen->swap_wait_context);
+
+ g_mutex_lock (&glx_onscreen->swap_wait_mutex);
+
+ while (TRUE)
+ {
+ gpointer queue_element;
+ uint32_t vblank_counter;
+
+ while (!glx_onscreen->closing_down && glx_onscreen->swap_wait_queue->length == 0)
+ g_cond_wait (&glx_onscreen->swap_wait_cond, &glx_onscreen->swap_wait_mutex);
+
+ if (glx_onscreen->closing_down)
+ break;
+
+ queue_element = g_queue_pop_tail (glx_onscreen->swap_wait_queue);
+ vblank_counter = GPOINTER_TO_UINT(queue_element);
+
+ g_mutex_unlock (&glx_onscreen->swap_wait_mutex);
+ glx_renderer->glXWaitVideoSync (2,
+ (vblank_counter + 1) % 2,
+ &vblank_counter);
+ g_mutex_lock (&glx_onscreen->swap_wait_mutex);
+
+ if (!glx_onscreen->closing_down)
+ {
+ int bytes_written = 0;
+
+ union {
+ char bytes[8];
+ int64_t presentation_time;
+ } u;
+
+ u.presentation_time = get_monotonic_time_ns ();
+
+ while (bytes_written < 8)
+ {
+ int res = write (glx_onscreen->swap_wait_pipe[1], u.bytes + bytes_written, 8 - bytes_written);
+ if (res == -1)
+ {
+ if (errno != EINTR)
+ g_error ("Error writing to swap notification pipe: %s\n",
+ g_strerror (errno));
+ }
+ else
+ {
+ bytes_written += res;
+ }
+ }
+ }
+ }
+
+ g_mutex_unlock (&glx_onscreen->swap_wait_mutex);
+
+ glx_renderer->glXMakeContextCurrent (xlib_renderer->xdpy,
+ None,
+ None,
+ NULL);
+
+ return NULL;
+}
+
+static int64_t
+threaded_swap_wait_pipe_prepare (void *user_data)
+{
+ return -1;
+}
+
+static void
+threaded_swap_wait_pipe_dispatch (void *user_data, int revents)
+{
+ CoglOnscreen *onscreen = user_data;
+ CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
+
+ CoglFrameInfo *info;
+
+ if ((revents & COGL_POLL_FD_EVENT_IN))
+ {
+ int bytes_read = 0;
+
+ union {
+ char bytes[8];
+ int64_t presentation_time;
+ } u;
+
+ while (bytes_read < 8)
+ {
+ int res = read (glx_onscreen->swap_wait_pipe[0], u.bytes + bytes_read, 8 - bytes_read);
+ if (res == -1)
+ {
+ if (errno != EINTR)
+ g_error ("Error reading from swap notification pipe: %s\n",
+ g_strerror (errno));
+ }
+ else
+ {
+ bytes_read += res;
+ }
+ }
+
+ set_sync_pending (onscreen);
+ set_complete_pending (onscreen);
+
+ info = g_queue_peek_head (&onscreen->pending_frame_infos);
+ info->presentation_time = u.presentation_time;
+ }
+}
+
+static void
+start_threaded_swap_wait (CoglOnscreen *onscreen,
+ uint32_t vblank_counter)
+{
+ CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
+ CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
+ CoglContext *context = framebuffer->context;
+
+ if (glx_onscreen->swap_wait_thread == NULL)
+ {
+ CoglDisplay *display = context->display;
+ CoglGLXRenderer *glx_renderer = display->renderer->winsys;
+ CoglGLXDisplay *glx_display = display->winsys;
+ CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
+ CoglXlibRenderer *xlib_renderer =
+ _cogl_xlib_renderer_get_data (display->renderer);
+
+ GLXDrawable drawable =
+ glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
+ int i;
+
+ ensure_ust_type (display->renderer, drawable);
+
+ if ((pipe (glx_onscreen->swap_wait_pipe) == -1))
+ g_error ("Couldn't create pipe for swap notification: %s\n",
+ g_strerror (errno));
+
+ for (i = 0; i < 2; i++)
+ {
+ if (fcntl(glx_onscreen->swap_wait_pipe[i], F_SETFD,
+ fcntl(glx_onscreen->swap_wait_pipe[i], F_GETFD, 0) | FD_CLOEXEC) == -1)
+ g_error ("Couldn't set swap notification pipe CLOEXEC: %s\n",
+ g_strerror (errno));
+ }
+
+ _cogl_poll_renderer_add_fd (display->renderer,
+ glx_onscreen->swap_wait_pipe[0],
+ COGL_POLL_FD_EVENT_IN,
+ threaded_swap_wait_pipe_prepare,
+ threaded_swap_wait_pipe_dispatch,
+ onscreen);
+
+ glx_onscreen->swap_wait_queue = g_queue_new ();
+ g_mutex_init (&glx_onscreen->swap_wait_mutex);
+ g_cond_init (&glx_onscreen->swap_wait_cond);
+ glx_onscreen->swap_wait_context =
+ glx_renderer->glXCreateNewContext (xlib_renderer->xdpy,
+ glx_display->fbconfig,
+ GLX_RGBA_TYPE,
+ glx_display->glx_context,
+ True);
+ glx_onscreen->swap_wait_thread = g_thread_new ("cogl_glx_swap_wait",
+ threaded_swap_wait,
+ onscreen);
+ }
+
+ g_mutex_lock (&glx_onscreen->swap_wait_mutex);
+ g_queue_push_head (glx_onscreen->swap_wait_queue, GUINT_TO_POINTER(vblank_counter));
+ g_cond_signal (&glx_onscreen->swap_wait_cond);
+ g_mutex_unlock (&glx_onscreen->swap_wait_mutex);
+}
+
static void
_cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
const int *user_rectangles,
@@ -2000,19 +2253,38 @@ _cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
if (framebuffer->config.swap_throttled)
{
- uint32_t end_frame_vsync_counter = 0;
-
have_counter = glx_display->have_vblank_counter;
- /* If the swap_region API is also being used then we need to track
- * the vsync counter for each swap request so we can manually
- * throttle swap_region requests. */
- if (have_counter)
- end_frame_vsync_counter = _cogl_winsys_get_vsync_counter (context);
-
- if (!glx_renderer->glXSwapInterval)
+ if (glx_renderer->glXSwapInterval)
{
- CoglBool can_wait = glx_display->can_vblank_wait;
+ if (_cogl_has_private_feature (context, COGL_PRIVATE_FEATURE_THREADED_SWAP_WAIT))
+ {
+ /* If we didn't wait for the GPU here, then it's easy to get the case
+ * where there is a VBlank between the point where we get the vsync counter
+ * and the point where the GPU is ready to actually perform the glXSwapBuffers(),
+ * and the swap wait terminates at the first VBlank rather than the one
+ * where the swap buffers happens. Calling glFinish() here makes this a
+ * rare race since the GPU is already ready to swap when we call glXSwapBuffers().
+ * The glFinish() also prevents any serious damage if the rare race happens,
+ * since it will wait for the preceding glXSwapBuffers() and prevent us from
+ * getting premanently ahead. (For NVIDIA drivers, glFinish() after glXSwapBuffers()
+ * waits for the buffer swap to happen.)
+ */
+ _cogl_winsys_wait_for_gpu (onscreen);
+ start_threaded_swap_wait (onscreen, _cogl_winsys_get_vsync_counter (context));
+ }
+ }
+ else
+ {
+ CoglBool can_wait = have_counter || glx_display->can_vblank_wait;
+
+ uint32_t end_frame_vsync_counter = 0;
+
+ /* If the swap_region API is also being used then we need to track
+ * the vsync counter for each swap request so we can manually
+ * throttle swap_region requests. */
+ if (have_counter)
+ end_frame_vsync_counter = _cogl_winsys_get_vsync_counter (context);
/* If we are going to wait for VBLANK manually, we not only
* need to flush out pending drawing to the GPU before we
--
2.12.0
From fb0978b4ea33c88e7a42d4f478d60ef86e271414 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Wed, 29 Jun 2016 13:52:59 -0400
Subject: [PATCH 6/7] Add cogl_xlib_renderer_set_threaded_swap_wait_enabled()
Because the threaded-swap-wait functionality requires XInitThreads(),
and because it isn't clear that it is a win for all applications,
add a API function to conditionally enable it.
Fix the cogl-crate example not to just have a hard-coded dependency
on libX11.
https://bugzilla.gnome.org/show_bug.cgi?id=779039
---
cogl/cogl/cogl-renderer-private.h | 1 +
cogl/cogl/cogl-renderer.c | 11 +++++++++++
cogl/cogl/cogl-xlib-renderer.h | 30 ++++++++++++++++++++++++++++++
cogl/cogl/winsys/cogl-winsys-glx.c | 1 +
4 files changed, 43 insertions(+)
diff --git a/cogl/cogl/cogl-renderer-private.h b/cogl/cogl/cogl-renderer-private.h
index 8627b6cc6..33ed0ceac 100644
--- a/cogl/cogl/cogl-renderer-private.h
+++ b/cogl/cogl/cogl-renderer-private.h
@@ -69,6 +69,7 @@ struct _CoglRenderer
Display *foreign_xdpy;
CoglBool xlib_enable_event_retrieval;
CoglBool xlib_want_reset_on_video_memory_purge;
+ CoglBool xlib_enable_threaded_swap_wait;
#endif
CoglDriver driver;
diff --git a/cogl/cogl/cogl-renderer.c b/cogl/cogl/cogl-renderer.c
index 51a04ffdd..e6575d808 100644
--- a/cogl/cogl/cogl-renderer.c
+++ b/cogl/cogl/cogl-renderer.c
@@ -285,6 +285,17 @@ cogl_xlib_renderer_request_reset_on_video_memory_purge (CoglRenderer *renderer,
renderer->xlib_want_reset_on_video_memory_purge = enable;
}
+
+void
+cogl_xlib_renderer_set_threaded_swap_wait_enabled (CoglRenderer *renderer,
+ CoglBool enable)
+{
+ _COGL_RETURN_IF_FAIL (cogl_is_renderer (renderer));
+ /* NB: Renderers are considered immutable once connected */
+ _COGL_RETURN_IF_FAIL (!renderer->connected);
+
+ renderer->xlib_enable_threaded_swap_wait = enable;
+}
#endif /* COGL_HAS_XLIB_SUPPORT */
CoglBool
diff --git a/cogl/cogl/cogl-xlib-renderer.h b/cogl/cogl/cogl-xlib-renderer.h
index f3c1d7c09..3c0db189b 100644
--- a/cogl/cogl/cogl-xlib-renderer.h
+++ b/cogl/cogl/cogl-xlib-renderer.h
@@ -168,6 +168,36 @@ cogl_xlib_renderer_set_event_retrieval_enabled (CoglRenderer *renderer,
CoglBool enable);
/**
+ * cogl_xlib_renderer_set_threaded_swap_wait_enabled:
+ * @renderer: a #CoglRenderer
+ * @enable: The new value
+ *
+ * Sets whether Cogl is allowed to use a separate threaded to wait for the
+ * completion of glXSwapBuffers() and call the frame callback for the
+ * corresponding #CoglOnscreen. This is a way of emulating the
+ * INTEL_swap_event extension, and will only ever be used if
+ * INTEL_swap_event is not present; it will also only be used for
+ * specific white-listed drivers that are known to work correctly with
+ * multiple contexts sharing state between threads.
+ *
+ * The advantage of enabling this is that it will allow your main loop
+ * to do other work while waiting for the system to be ready to draw
+ * the next frame, instead of blocking in glXSwapBuffers(). A disadvantage
+ * is that the driver will be prevented from buffering up multiple frames
+ * even if it thinks that it would be advantageous. In general, this
+ * will work best for something like a system compositor that is doing
+ * simple drawing but handling lots of other complex tasks.
+ *
+ * If you enable this, you must call XInitThreads() before any other
+ * X11 calls in your program. (See the documentation for XInitThreads())
+ *
+ * Stability: unstable
+ */
+void
+cogl_xlib_renderer_set_threaded_swap_wait_enabled (CoglRenderer *renderer,
+ CoglBool enable);
+
+/**
* cogl_xlib_renderer_get_display: (skip)
*/
Display *
diff --git a/cogl/cogl/winsys/cogl-winsys-glx.c b/cogl/cogl/winsys/cogl-winsys-glx.c
index 1418d1501..74b0895d1 100644
--- a/cogl/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/cogl/winsys/cogl-winsys-glx.c
@@ -901,6 +901,7 @@ update_winsys_features (CoglContext *context, CoglError **error)
{
CoglGpuInfo *info = &context->gpu;
if (glx_display->have_vblank_counter &&
+ context->display->renderer->xlib_enable_threaded_swap_wait &&
info->vendor == COGL_GPU_INFO_VENDOR_NVIDIA)
{
COGL_FLAGS_SET (context->winsys_features,
--
2.12.0
From 9505ce8cce4fe14443b5c9868e4e7301268a8d23 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Tue, 21 Feb 2017 13:51:16 -0500
Subject: [PATCH 7/7] Call cogl_xlib_renderer_set_threaded_swap_wait_enabled()
Set up things so that if the INTEL_swap_event extension is not present,
but the driver is known to have good thread support, we use an extra
thread and call glXWaitVideoSync() in the thread. This allows idles
to work properly, even when Mutter is constantly redrawing new frames;
otherwise, without INTEL_swap_event, we'll just block in glXSwapBuffers().
https://bugzilla.gnome.org/show_bug.cgi?id=779039
---
src/backends/x11/meta-backend-x11.c | 6 ++++++
src/backends/x11/meta-renderer-x11.c | 8 ++++++++
2 files changed, 14 insertions(+)
diff --git a/src/backends/x11/meta-backend-x11.c b/src/backends/x11/meta-backend-x11.c
index a0b196efe..413b0622a 100644
--- a/src/backends/x11/meta-backend-x11.c
+++ b/src/backends/x11/meta-backend-x11.c
@@ -913,6 +913,12 @@ meta_backend_x11_init (MetaBackendX11 *x11)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
+ /* XInitThreads() is needed to use the "threaded swap wait" functionality
+ * in Cogl - see meta_renderer_x11_create_cogl_renderer(). We call it here
+ * to hopefully call it before any other use of XLib.
+ */
+ XInitThreads();
+
clutter_x11_request_reset_on_video_memory_purge ();
/* We do X11 event retrieval ourselves */
diff --git a/src/backends/x11/meta-renderer-x11.c b/src/backends/x11/meta-renderer-x11.c
index c0405bedc..9a86f493a 100644
--- a/src/backends/x11/meta-renderer-x11.c
+++ b/src/backends/x11/meta-renderer-x11.c
@@ -65,6 +65,14 @@ meta_renderer_x11_create_cogl_renderer (MetaRenderer *renderer)
cogl_renderer_set_custom_winsys (cogl_renderer, get_x11_cogl_winsys_vtable);
cogl_xlib_renderer_set_foreign_display (cogl_renderer, xdisplay);
+ /* Set up things so that if the INTEL_swap_event extension is not present,
+ * but the driver is known to have good thread support, we use an extra
+ * thread and call glXWaitVideoSync() in the thread. This allows idles
+ * to work properly, even when Mutter is constantly redrawing new frames;
+ * otherwise, without INTEL_swap_event, we'll just block in glXSwapBuffers().
+ */
+ cogl_xlib_renderer_set_threaded_swap_wait_enabled (cogl_renderer, TRUE);
+
return cogl_renderer;
}
--
2.12.0