diff --git a/doc/classes/ProjectSettings.xml b/doc/classes/ProjectSettings.xml index 02f001edc9c..8746a1d8b4f 100644 --- a/doc/classes/ProjectSettings.xml +++ b/doc/classes/ProjectSettings.xml @@ -345,6 +345,7 @@ If [member display/window/vsync/vsync_mode] is [code]Enabled[/code], on monitors with variable refresh rate enabled (G-Sync/FreeSync), using a FPS limit a few frames lower than the monitor's refresh rate will [url=https://blurbusters.com/howto-low-lag-vsync-on/]reduce input lag while avoiding tearing[/url]. If [member display/window/vsync/vsync_mode] is [code]Disabled[/code], limiting the FPS to a high value that can be consistently reached on the system can reduce input lag compared to an uncapped framerate. Since this works by ensuring the GPU load is lower than 100%, this latency reduction is only effective in GPU-bottlenecked scenarios, not CPU-bottlenecked scenarios. See also [member physics/common/physics_ticks_per_second]. + This setting can be overridden using the [code]--max-fps <fps;>[/code] command line argument (including with a value of [code]0[/code] for unlimited framerate). [b]Note:[/b] This property is only read when the project starts. To change the rendering FPS cap at runtime, set [member Engine.max_fps] instead. diff --git a/main/main.cpp b/main/main.cpp index 7e2741648da..6f77169502c 100644 --- a/main/main.cpp +++ b/main/main.cpp @@ -210,6 +210,7 @@ static bool debug_paths = false; static bool debug_navigation = false; static bool debug_avoidance = false; #endif +static int max_fps = -1; static int frame_delay = 0; static bool disable_render_loop = false; static int fixed_fps = -1; @@ -462,7 +463,8 @@ void Main::print_help(const char *p_binary) { OS::get_singleton()->print(" --debug-avoidance Show navigation avoidance debug visuals when running the scene.\n"); OS::get_singleton()->print(" --debug-stringnames Print all StringName allocations to stdout when the engine quits.\n"); #endif - OS::get_singleton()->print(" --frame-delay Simulate high CPU load (delay each frame by milliseconds).\n"); + OS::get_singleton()->print(" --max-fps Set a maximum number of frames per second rendered (can be used to limit power usage). A value of 0 results in unlimited framerate.\n"); + OS::get_singleton()->print(" --frame-delay Simulate high CPU load (delay each frame by milliseconds). Do not use as a FPS limiter; use --max-fps instead.\n"); OS::get_singleton()->print(" --time-scale Force time scale (higher values are faster, 1.0 is normal speed).\n"); OS::get_singleton()->print(" --disable-vsync Forces disabling of vertical synchronization, even if enabled in the project settings. Does not override driver-level V-Sync enforcement.\n"); OS::get_singleton()->print(" --disable-render-loop Disable render loop so rendering only occurs when called explicitly from script.\n"); @@ -1329,6 +1331,16 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph goto error; } + } else if (I->get() == "--max-fps") { // set maximum rendered FPS + + if (I->next()) { + max_fps = I->next()->get().to_int(); + N = I->next()->next(); + } else { + OS::get_singleton()->print("Missing maximum FPS argument, aborting.\n"); + goto error; + } + } else if (I->get() == "--frame-delay") { // force frame delay if (I->next()) { @@ -1961,6 +1973,10 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph OS::get_singleton()->set_environment("MVK_CONFIG_LOG_LEVEL", OS::get_singleton()->_verbose_stdout ? "3" : "1"); // 1 = Errors only, 3 = Info #endif + if (max_fps >= 0) { + Engine::get_singleton()->set_max_fps(max_fps); + } + if (frame_delay == 0) { frame_delay = GLOBAL_DEF(PropertyInfo(Variant::INT, "application/run/frame_delay_msec", PROPERTY_HINT_RANGE, "0,100,1,or_greater"), 0); } diff --git a/misc/dist/linux/godot.6 b/misc/dist/linux/godot.6 index 2481869d8a4..a00a69299c3 100644 --- a/misc/dist/linux/godot.6 +++ b/misc/dist/linux/godot.6 @@ -105,8 +105,11 @@ Show collisions shapes when running the scene. \fB\-\-debug\-navigation\fR Show navigation polygons when running the scene. .TP +\fB\-\-max\-fps\fR +Set a maximum number of frames per second rendered (can be used to limit power usage). A value of 0 results in unlimited framerate. +.TP \fB\-\-frame\-delay\fR -Simulate high CPU load (delay each frame by milliseconds). +Simulate high CPU load (delay each frame by milliseconds). Do not use as a FPS limiter; use --max-fps instead. .TP \fB\-\-time\-scale\fR Force time scale (higher values are faster, 1.0 is normal speed). diff --git a/misc/dist/shell/_godot.zsh-completion b/misc/dist/shell/_godot.zsh-completion index 89fe8401663..3b12fdbc22e 100644 --- a/misc/dist/shell/_godot.zsh-completion +++ b/misc/dist/shell/_godot.zsh-completion @@ -69,6 +69,7 @@ _arguments \ '--debug-collisions[show collision shapes when running the scene]' \ '--debug-navigation[show navigation polygons when running the scene]' \ '--debug-stringnames[print all StringName allocations to stdout when the engine quits]' \ + '--frame-delay[set a maximum number of frames per second rendered (can be used to limit power usage), a value of 0 results in unlimited framerate]:maximum frames per seocnd' \ '--frame-delay[simulate high CPU load (delay each frame by the given number of milliseconds)]:number of milliseconds' \ '--time-scale[force time scale (higher values are faster, 1.0 is normal speed)]:time scale' \ '--disable-vsync[disable vertical synchronization even if enabled in the project settings]' \ diff --git a/misc/dist/shell/godot.bash-completion b/misc/dist/shell/godot.bash-completion index a7ce11e5241..ba4edc4f255 100644 --- a/misc/dist/shell/godot.bash-completion +++ b/misc/dist/shell/godot.bash-completion @@ -72,6 +72,7 @@ _complete_godot_options() { --debug-collisions --debug-navigation --debug-stringnames +--max-fps --frame-delay --time-scale --disable-vsync diff --git a/misc/dist/shell/godot.fish b/misc/dist/shell/godot.fish index ed58d8dcf6d..bb4ff0b558a 100644 --- a/misc/dist/shell/godot.fish +++ b/misc/dist/shell/godot.fish @@ -89,6 +89,7 @@ complete -c godot -l remote-debug -d "Enable remote debugging" complete -c godot -l debug-collisions -d "Show collision shapes when running the scene" complete -c godot -l debug-navigation -d "Show navigation polygons when running the scene" complete -c godot -l debug-stringnames -d "Print all StringName allocations to stdout when the engine quits" +complete -c godot -l max-fps -d "Set a maximum number of frames per second rendered (can be used to limit power usage), a value of 0 results in unlimited framerate" -x complete -c godot -l frame-delay -d "Simulate high CPU load (delay each frame by the given number of milliseconds)" -x complete -c godot -l time-scale -d "Force time scale (higher values are faster, 1.0 is normal speed)" -x complete -c godot -l disable-render-loop -d "Disable render loop so rendering only occurs when called explicitly from script"