various: allow changing GPU API options at runtime

Set UPDATE_VO to GPU API options that are only set on init.

To change multiple options without multiple reinits, use
set vo null; set opengl-foo 1; set opengl-bar 1; set vo gpu

Author: guidocella

video/out/opengl/context.c

@@ -57,11 +57,13 @@ const struct m_sub_options opengl_conf = {
     .opts = (const struct m_option[]) {
         {"opengl-glfinish", OPT_BOOL(use_glfinish)},
         {"opengl-waitvsync", OPT_BOOL(waitvsync)},
-        {"opengl-swapinterval", OPT_INT(swapinterval)},
+        {"opengl-swapinterval", OPT_INT(swapinterval), .flags = UPDATE_VO},
         {"opengl-check-pattern-a", OPT_INT(vsync_pattern[0])},
         {"opengl-check-pattern-b", OPT_INT(vsync_pattern[1])},
         {"opengl-es", OPT_CHOICE(gles_mode,
-            {"auto", GLES_AUTO}, {"yes", GLES_YES}, {"no", GLES_NO})},
+            {"auto", GLES_AUTO}, {"yes", GLES_YES}, {"no", GLES_NO}),
+            .flags = UPDATE_VO,
+        },
         {"opengl-early-flush", OPT_CHOICE(early_flush,
             {"no", FLUSH_NO}, {"yes", FLUSH_YES}, {"auto", FLUSH_AUTO})},
         {0},

video/out/vulkan/context.c

@@ -107,6 +107,7 @@ const struct m_sub_options vulkan_conf = {
         .async_transfer = true,
         .async_compute = true,
     },
+    .change_flags = UPDATE_VO,
 };
 
 struct priv {