options: slightly better option update mechanism

Extend the flag-based notification mechanism that was used via
M_OPT_TERM. Make the vo_opengl update mechanism use this (which, btw.,
also fixes compilation with OpenGL renderers forcibly disabled).

While this adds a 3rd mechanism and just seems to further the chaos, I'd
rather have a very simple mechanism now, than actually furthering the
mess by mixing old and new update mechanisms. In particular, we'll be
able to remove quite some property implementations, and replace them
with much simpler update handling. The new update mechanism can also
more easily refactored once we have a final mechanism that handles
everything in an uniform way.

1 files changed, 7 insertions, 0 deletions

diff --git a/options/m_config.h b/options/m_config.h
index 8befc51805..74390f150b 100644
--- a/options/m_config.h
+++ b/options/m_config.h
@@ -77,10 +77,17 @@ typedef struct m_config {
     int (*includefunc)(void *ctx, char *filename, int flags);
     void *includefunc_ctx;
 
+    // Can intercept option write accesses.
     int (*option_set_callback)(void *ctx, struct m_config_option *co,
                                void *data, int flags);
     void *option_set_callback_cb;
 
+    // Notification after an option was successfully written to.
+    // Uses flags as set in UPDATE_OPTS_MASK.
+    void (*option_change_callback)(void *ctx, struct m_config_option *co,
+                                   int flags);
+    void *option_change_callback_ctx;
+
     // For the command line parser
     int recursion_depth;