Add frame delta smoothing option (4.x)

Frame deltas are currently measured by querying the OS timer each frame. This is subject to random error. Frame delta smoothing instead filters the delta read from the OS by replacing it with the refresh rate delta wherever possible.

This PR also contains code to estimate the refresh rate based on the input deltas, without reading the refresh rate from the host OS.

The delta_smooth_enabled setting can also be modified at runtime through OS::, and there is also now a command line setting to override the project setting.

1 files changed, 3 insertions, 0 deletions

diff --git a/core/core_bind.h b/core/core_bind.h
index be43ae2c9d..38a681c7db 100644
--- a/core/core_bind.h
+++ b/core/core_bind.h
@@ -141,6 +141,9 @@ public:
 	void set_low_processor_usage_mode_sleep_usec(int p_usec);
 	int get_low_processor_usage_mode_sleep_usec() const;
 
+	void set_delta_smoothing(bool p_enabled);
+	bool is_delta_smoothing_enabled() const;
+
 	void alert(const String &p_alert, const String &p_title = "ALERT!");
 	void crash(const String &p_message);