mg2d: add a context variable to control the log level

Simpler to use than overriding the log callback.

API bump.

1 files changed, 9 insertions, 1 deletions

diff --git a/mg2d.h b/mg2d.h
index 834e717..a587a18 100644
--- a/mg2d.h
+++ b/mg2d.h
@@ -168,7 +168,9 @@ typedef struct MG2DContext {
     /**
      * A callback that will be used to print diagnostic messages.
      *
-     * Defaults to fprintf(stderr, ...)
+     * The default implementation prints to stderr.
+     *
+     * May be set to NULL to disable logging.
      */
     void (*log_callback)(const struct MG2DContext *ctx, int level,
                          const char *fmt, va_list);
@@ -272,6 +274,12 @@ typedef struct MG2DContext {
      * Time-stepping factor to use for relaxation.
      */
     double cfl_factor;
+
+    /**
+     * Maximum level of messages printed by the default logging callback. Has no
+     * effect when log_callback is overridden.
+     */
+    enum MG2DLogLevel log_level;
 } MG2DContext;
 
 /**