vo_opengl: add time queries

To avoid blocking the CPU, we use 8 time objects and rotate through
them, only blocking until the last possible moment (before we need
access to them on the next iteration through the ring buffer). I tested
it out on my machine and 4 query objects were enough to guarantee
block-free querying, but the extra margin shouldn't hurt.

Frame render times are just output at the end of each frame, via MP_DBG.
This might be improved in the future. (In particular, I want to expose
these numbers as properties so that users get some more visible feedback
about render times)

Currently, we measure pass_render_frame and pass_draw_to_screen
separately because the former might be called multiple times due to
interpolation. Doing it this way gives more faithful numbers. Same goes
for frame upload times.

1 files changed, 17 insertions, 0 deletions

diff --git a/video/out/opengl/common.c b/video/out/opengl/common.c
index 99d8bbeb51..dd9ecc46fa 100644
--- a/video/out/opengl/common.c
+++ b/video/out/opengl/common.c
@@ -274,6 +274,23 @@ static const struct gl_functions gl_functions[] = {
         },
     },
     {
+        .ver_core = 330,
+        .extension = "GL_ARB_timer_query",
+        .functions = (const struct gl_function[]) {
+            DEF_FN(GenQueries),
+            DEF_FN(DeleteQueries),
+            DEF_FN(BeginQuery),
+            DEF_FN(EndQuery),
+            DEF_FN(QueryCounter),
+            DEF_FN(IsQuery),
+            DEF_FN(GetQueryObjectiv),
+            DEF_FN(GetQueryObjecti64v),
+            DEF_FN(GetQueryObjectuiv),
+            DEF_FN(GetQueryObjectui64v),
+            {0}
+        },
+    },
+    {
         .ver_core = 430,
         .ver_es_core = 300,
         .functions = (const struct gl_function[]) {