vo_opengl: refactor vo performance subsystem

This replaces `vo-performance` by `vo-passes`, bringing with it a number
of changes and improvements:

1. mpv users can now introspect the vo_opengl passes, which is something
   that has been requested multiple times.

2. performance data is now measured per-pass, which helps both
   development and debugging.

3. since adding more passes is cheap, we can now report information for
   more passes (e.g. the blit pass, and the osd pass). Note: we also
   switch to nanosecond scale, to be able to measure these passes
   better.

4. `--user-shaders` authors can now describe their own passes, helping
   users both identify which user shaders are active at any given time
   as well as helping shader authors identify performance issues.

5. the timing data per pass is now exported as a full list of samples,
   so projects like Argon-/mpv-stats can immediately read out all of the
   samples and render a graph without having to manually poll this
   option constantly.

Due to gl_timer's design being complicated (directly reading performance
data would block, so we delay the actual read-back until the next _start
command), it's vital not to conflate different passes that might be
doing different things from one frame to another. To accomplish this,
the actual timers are stored as part of the gl_shader_cache's sc_entry,
which makes them unique for that exact shader.

Starting and stopping the time measurement is easy to unify with the
gl_sc architecture, because the existing API already relies on a
"generate, render, reset" flow, so we can just put timer_start and
timer_stop in sc_generate and sc_reset, respectively.

The ugliest thing about this code is that due to the need to keep pass
information relatively stable in between frames, we need to distinguish
between "new" and "redrawn" frames, which bloats the code somewhat and
also feels hacky and vo_opengl-specific. (But then again, this entire
thing is vo_opengl-specific)

1 files changed, 1 insertions, 1 deletions

diff --git a/video/out/opengl/video.h b/video/out/opengl/video.h
index 55fd18461a..8526cecb84 100644
--- a/video/out/opengl/video.h
+++ b/video/out/opengl/video.h
@@ -155,7 +155,7 @@ void gl_video_render_frame(struct gl_video *p, struct vo_frame *frame, int fbo);
 void gl_video_resize(struct gl_video *p, int vp_w, int vp_h,
                      struct mp_rect *src, struct mp_rect *dst,
                      struct mp_osd_res *osd);
-struct voctrl_performance_data gl_video_perfdata(struct gl_video *p);
+void gl_video_perfdata(struct gl_video *p, struct voctrl_performance_data *out);
 struct mp_csp_equalizer;
 struct mp_csp_equalizer *gl_video_eq_ptr(struct gl_video *p);
 void gl_video_eq_update(struct gl_video *p);