timeline: Add weston_timeline_profiling() and use it

When we use perfetto, we'll want to enable the renderer timepoints, which
are currently gated behind weston_log_scope_is_enabled(). So let's make a
function that checks if either the timeline scope or perfetto is enabled.

We do not yet process these timepoints, that comes in a future commit.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>

libweston/renderer-gl/gl-renderer.c

@@ -525,7 +525,7 @@ static void
 timeline_begin_render_query(struct gl_renderer *gr, GLuint query)
 {
 	if (gl_features_has(gr, FEATURE_GPU_TIMELINE) &&
-	    weston_log_scope_is_enabled(gr->compositor->timeline))
+	    weston_timeline_profiling(gr->compositor->timeline))
 		gr->begin_query(GL_TIME_ELAPSED_EXT, query);
 }
 
@@ -533,7 +533,7 @@ static void
 timeline_end_render_query(struct gl_renderer *gr)
 {
 	if (gl_features_has(gr, FEATURE_GPU_TIMELINE) &&
-	    weston_log_scope_is_enabled(gr->compositor->timeline))
+	    weston_timeline_profiling(gr->compositor->timeline))
 		gr->end_query(GL_TIME_ELAPSED_EXT);
 }
 
@@ -608,7 +608,7 @@ timeline_submit_render_sync(struct gl_renderer *gr,
 	struct timeline_render_point *trp;
 
 	if (!gl_features_has(gr, FEATURE_GPU_TIMELINE) ||
-	    !weston_log_scope_is_enabled(gr->compositor->timeline) ||
+	    !weston_timeline_profiling(gr->compositor->timeline) ||
 	    sync == EGL_NO_SYNC_KHR)
 		return;
 

libweston/timeline.c

@@ -36,6 +36,7 @@
 #include <libweston/weston-log.h>
 #include "timeline.h"
 #include "weston-log-internal.h"
+#include "weston-trace.h"
 
 /**
  * Timeline itself is not a subscriber but a scope (a producer of data), and it
@@ -494,3 +495,24 @@ weston_timeline_point(struct weston_log_scope *timeline_scope,
 
 	}
 }
+
+/** Check if weston is tracing performance events
+ *
+ * @param timeline_scope the timeline scope
+ *
+ * Returns true if weston is generating performance events for either perfetto
+ * or the timeline log scope.
+ *
+ * @ingroup log
+ */
+WL_EXPORT bool
+weston_timeline_profiling(struct weston_log_scope *timeline_scope)
+{
+	if (weston_log_scope_is_enabled(timeline_scope))
+		return true;
+
+	if (util_perfetto_is_tracing_enabled())
+		return true;
+
+	return false;
+}

libweston/timeline.h

@@ -111,4 +111,7 @@ void
 weston_timeline_point(struct weston_log_scope *timeline_scope,
 		      enum timeline_point_name tlp_name, ...);
 
+bool
+weston_timeline_profiling(struct weston_log_scope *timeline_scope);
+
 #endif /* WESTON_TIMELINE_H */