cpp/openttd-patchpack/source Changeset - r24833:e40e0f8b2230

Changeset - r24833:e40e0f8b2230

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Patric Stout - 4 years ago 2021-02-17 14:04:46
truebrain@openttd.org

Add: draw the screen at a steady pace, also during fast-forward

During fast-forward, the game was drawing as fast as it could. This
means that the fast-forward was limited also by how fast we could
draw, something that people in general don't expect.

To give an extreme case, if you are fully zoomed out on a busy
map, fast-forward would be mostly limited because of the time it
takes to draw the screen.

By decoupling the draw-tick and game-tick, we can keep the pace
of the draw-tick the same while speeding up the game-tick. To use
the extreme case as example again, if you are fully zoomed out
now, the screen only redraws 33.33 times per second, fast-forwarding
or not. This means fast-forward is much more likely to go at the
same speed, no matter what you are looking at.

9 files changed with 114 insertions and 96 deletions:

src/openttd.cpp

src/video/allegro_v.cpp

src/video/cocoa/cocoa_v.mm

src/video/dedicated_v.cpp

src/video/null_v.cpp

src/video/sdl2_v.cpp

src/video/sdl2_v.h

src/video/sdl_v.cpp

src/video/win32_v.cpp

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src/openttd.cpp

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@@ @@ -1465,7 +1465,6 @@ void GameLoop() @@
 	if (_game_mode == GM_BOOTSTRAP) {
 		/* Check for UDP stuff */
 		if (_network_available) NetworkBackgroundLoop();
 		InputLoop();
 		return;
+	}
@@ @@ -1505,8 +1504,6 @@ void GameLoop() @@
 	if (!_pause_mode && HasBit(_display_opt, DO_FULL_ANIMATION)) DoPaletteAnimations();
 	InputLoop();
 	SoundDriver::GetInstance()->MainLoop();
 	MusicLoop();
+}

src/video/allegro_v.cpp

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@@ @@ -24,6 +24,7 @@ @@
 #include "../core/math_func.hpp"
 #include "../framerate_type.h"
 #include "../thread.h"
 #include "../window_func.h"
 #include "allegro_v.h"
 #include <allegro.h>
@@ @@ -449,7 +450,8 @@ void VideoDriver_Allegro::MainLoop() @@
+{
 	auto cur_ticks = std::chrono::steady_clock::now();
 	auto last_realtime_tick = cur_ticks;
 	auto next_tick = cur_ticks;
 	auto next_game_tick = cur_ticks;
 	auto next_draw_tick = cur_ticks;
 	CheckPaletteAnim();
@@ @@ -481,8 +483,14 @@ void VideoDriver_Allegro::MainLoop() @@
 			last_realtime_tick += delta;
+		}
 		if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode)) {
 			next_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 		if (cur_ticks >= next_game_tick || (_fast_forward && !_pause_mode)) {
 			next_game_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			GameLoop();
+		}
 		if (cur_ticks >= next_draw_tick) {
 			next_draw_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			bool old_ctrl_pressed = _ctrl_pressed;
@@ @@ -498,16 +506,15 @@ void VideoDriver_Allegro::MainLoop() @@
 			if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
 			GameLoop();
 			InputLoop();
 			UpdateWindows();
 			CheckPaletteAnim();
 			DrawSurfaceToScreen();
 		} else {
+		}
 		if (!_fast_forward || _pause_mode) {
 			CSleep(1);
 			NetworkDrawChatMessage();
 			DrawMouseCursor();
 			DrawSurfaceToScreen();
+		}
+	}
+}

src/video/cocoa/cocoa_v.mm

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@@ @@ -636,7 +636,8 @@ void VideoDriver_Cocoa::GameLoop() @@
+{
 	auto cur_ticks = std::chrono::steady_clock::now();
 	auto last_realtime_tick = cur_ticks;
 	auto next_tick = cur_ticks;
 	auto next_game_tick = cur_ticks;
 	auto next_draw_tick = cur_ticks;
 	for (;;) {
 		@autoreleasepool {
@@ @@ -672,8 +673,14 @@ void VideoDriver_Cocoa::GameLoop() @@
 				last_realtime_tick += delta;
+			}
 			if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode)) {
 				next_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			if (cur_ticks >= next_game_tick || (_fast_forward && !_pause_mode)) {
 				next_game_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 				::GameLoop();
+			}
 			if (cur_ticks >= next_draw_tick) {
 				next_draw_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 				bool old_ctrl_pressed = _ctrl_pressed;
@@ @@ -682,16 +689,15 @@ void VideoDriver_Cocoa::GameLoop() @@
 				if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
 				::GameLoop();
 				InputLoop();
 				UpdateWindows();
 				this->CheckPaletteAnim();
 				this->Draw();
 			} else {
+			}
 			if (!_fast_forward || _pause_mode) {
 				CSleep(1);
 				NetworkDrawChatMessage();
 				DrawMouseCursor();
 				this->Draw();
+			}
+		}
+	}

src/video/dedicated_v.cpp

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@@ @@ -21,6 +21,7 @@ @@
 #include "../core/random_func.hpp"
 #include "../saveload/saveload.h"
 #include "../thread.h"
 #include "../window_func.h"
 #include "dedicated_v.h"
 #ifdef __OS2__
@@ @@ -295,6 +296,7 @@ void VideoDriver_Dedicated::MainLoop() @@
 			next_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			GameLoop();
 			InputLoop();
 			UpdateWindows();
+		}

src/video/null_v.cpp

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@@ @@ -10,6 +10,7 @@ @@
 #include "../stdafx.h"
 #include "../gfx_func.h"
 #include "../blitter/factory.hpp"
 #include "../window_func.h"
 #include "null_v.h"
 #include "../safeguards.h"
@@ @@ -48,6 +49,7 @@ void VideoDriver_Null::MainLoop() @@
 	for (i = 0; i < this->ticks; i++) {
 		GameLoop();
 		InputLoop();
 		UpdateWindows();
+	}
+}

src/video/sdl2_v.cpp

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@@ @@ -776,8 +776,18 @@ void VideoDriver_SDL::LoopOnce() @@
 		last_realtime_tick += delta;
+	}
 	if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode)) {
 		next_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 	if (cur_ticks >= next_game_tick || (_fast_forward && !_pause_mode)) {
 		next_game_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 		/* The gameloop is the part that can run asynchronously. The rest
 		 * except sleeping can't. */
 		if (_draw_mutex != nullptr) draw_lock.unlock();
 		GameLoop();
 		if (_draw_mutex != nullptr) draw_lock.lock();
+	}
 	if (cur_ticks >= next_draw_tick) {
 		next_draw_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 		bool old_ctrl_pressed = _ctrl_pressed;
@@ @@ -792,48 +802,33 @@ void VideoDriver_SDL::LoopOnce() @@
 			(keys[SDL_SCANCODE_DOWN]  ? 8 : 0);
 		if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
 		/* The gameloop is the part that can run asynchronously. The rest
 		 * except sleeping can't. */
 		if (_draw_mutex != nullptr) draw_lock.unlock();
 		GameLoop();
 		if (_draw_mutex != nullptr) draw_lock.lock();
 		InputLoop();
 		UpdateWindows();
 		this->CheckPaletteAnim();
 	} else {
 		/* Release the thread while sleeping */
 		if (_draw_mutex != nullptr) {
 			draw_lock.unlock();
 			CSleep(1);
 			draw_lock.lock();
 		if (_draw_mutex != nullptr && !HasModalProgress()) {
 			_draw_signal->notify_one();
 		} else {
 			Paint();
+		}
+	}
 /* Emscripten is running an event-based mainloop; there is already some
  * downtime between each iteration, so no need to sleep. */
 #ifndef __EMSCRIPTEN__
 			CSleep(1);
 #endif
+		}
 		NetworkDrawChatMessage();
 		DrawMouseCursor();
 	if (!_fast_forward || _pause_mode) {
 		if (_draw_mutex != nullptr) draw_lock.unlock();
 		CSleep(1);
 		if (_draw_mutex != nullptr) draw_lock.lock();
+	}
 	/* End of the critical part. */
 	if (_draw_mutex != nullptr && !HasModalProgress()) {
 		_draw_signal->notify_one();
 	} else {
 		/* Oh, we didn't have threads, then just draw unthreaded */
 		Paint();
+	}
 #endif
+}
 void VideoDriver_SDL::MainLoop()
+{
 	cur_ticks = std::chrono::steady_clock::now();
 	last_realtime_tick = cur_ticks;
-	next_tick = cur_ticks;
+	next_game_tick = cur_ticks;
 	this->CheckPaletteAnim();

src/video/sdl2_v.h

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@@ @@ -64,7 +64,8 @@ private: @@
 	std::chrono::steady_clock::time_point cur_ticks;
 	std::chrono::steady_clock::time_point last_realtime_tick;
 	std::chrono::steady_clock::time_point next_tick;
 	std::chrono::steady_clock::time_point next_game_tick;
 	std::chrono::steady_clock::time_point next_draw_tick;
 	int startup_display;
 	std::thread draw_thread;

src/video/sdl_v.cpp

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@@ @@ -21,6 +21,7 @@ @@
 #include "../core/math_func.hpp"
 #include "../fileio_func.h"
 #include "../framerate_type.h"
 #include "../window_func.h"
 #include "sdl_v.h"
 #include <SDL.h>
 #include <mutex>
@@ @@ -650,7 +651,8 @@ void VideoDriver_SDL::MainLoop() @@
+{
 	auto cur_ticks = std::chrono::steady_clock::now();
 	auto last_realtime_tick = cur_ticks;
 	auto next_tick = cur_ticks;
 	auto next_game_tick = cur_ticks;
 	auto next_draw_tick = cur_ticks;
 	uint32 mod;
 	int numkeys;
 	Uint8 *keys;
@@ @@ -727,8 +729,18 @@ void VideoDriver_SDL::MainLoop() @@
 			last_realtime_tick += delta;
+		}
 		if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode)) {
 			next_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 		if (cur_ticks >= next_game_tick || (_fast_forward && !_pause_mode)) {
 			next_game_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			/* The gameloop is the part that can run asynchronously. The rest
 			 * except sleeping can't. */
 			if (_draw_mutex != nullptr) draw_lock.unlock();
 			GameLoop();
 			if (_draw_mutex != nullptr) draw_lock.lock();
+		}
 		if (cur_ticks >= next_draw_tick) {
 			next_draw_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			bool old_ctrl_pressed = _ctrl_pressed;
@@ @@ -750,33 +762,22 @@ void VideoDriver_SDL::MainLoop() @@
 #endif
 			if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
 			/* The gameloop is the part that can run asynchronously. The rest
 			 * except sleeping can't. */
 			if (_draw_mutex != nullptr) draw_lock.unlock();
 			GameLoop();
 			if (_draw_mutex != nullptr) draw_lock.lock();
 			InputLoop();
 			UpdateWindows();
 			_local_palette = _cur_palette;
 		} else {
 			/* Release the thread while sleeping */
 			if (_draw_mutex != nullptr && !HasModalProgress()) {
 				_draw_signal->notify_one();
 			} else {
 				CheckPaletteAnim();
 				DrawSurfaceToScreen();
+			}
+		}
 		if (!_fast_forward || _pause_mode) {
 			if (_draw_mutex != nullptr) draw_lock.unlock();
 			CSleep(1);
 			if (_draw_mutex != nullptr) draw_lock.lock();
 			NetworkDrawChatMessage();
 			DrawMouseCursor();
+		}
 		/* End of the critical part. */
 		if (_draw_mutex != nullptr && !HasModalProgress()) {
 			_draw_signal->notify_one();
 		} else {
 			/* Oh, we didn't have threads, then just draw unthreaded */
 			CheckPaletteAnim();
 			DrawSurfaceToScreen();
+		}
+	}

src/video/win32_v.cpp

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@@ @@ -1135,7 +1135,8 @@ void VideoDriver_Win32::MainLoop() @@
 	MSG mesg;
 	auto cur_ticks = std::chrono::steady_clock::now();
 	auto last_realtime_tick = cur_ticks;
 	auto next_tick = cur_ticks;
 	auto next_game_tick = cur_ticks;
 	auto next_draw_tick = cur_ticks;
 	std::thread draw_thread;
 	std::unique_lock<std::recursive_mutex> draw_lock;
@@ @@ -1205,8 +1206,21 @@ void VideoDriver_Win32::MainLoop() @@
 			last_realtime_tick += delta;
+		}
 		if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode)) {
 			next_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 		if (cur_ticks >= next_game_tick || (_fast_forward && !_pause_mode)) {
 			next_game_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			/* Flush GDI buffer to ensure we don't conflict with the drawing thread. */
 			GdiFlush();
 			/* The game loop is the part that can run asynchronously.
 			 * The rest except sleeping can't. */
 			if (_draw_threaded) draw_lock.unlock();
 			GameLoop();
 			if (_draw_threaded) draw_lock.lock();
+		}
 		if (cur_ticks >= next_draw_tick) {
 			next_draw_tick = cur_ticks + std::chrono::milliseconds(MILLISECONDS_PER_TICK);
 			bool old_ctrl_pressed = _ctrl_pressed;
@@ @@ -1226,30 +1240,23 @@ void VideoDriver_Win32::MainLoop() @@
 			if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
 			if (_force_full_redraw) MarkWholeScreenDirty();
 			/* Flush GDI buffer to ensure we don't conflict with the drawing thread. */
 			GdiFlush();
 			/* The game loop is the part that can run asynchronously.
 			 * The rest except sleeping can't. */
 			if (_draw_threaded) draw_lock.unlock();
 			GameLoop();
 			if (_draw_threaded) draw_lock.lock();
 			if (_force_full_redraw) MarkWholeScreenDirty();
 			InputLoop();
 			UpdateWindows();
 			CheckPaletteAnim();
 		} else {
+		}
 		if (!_fast_forward || _pause_mode) {
 			/* Flush GDI buffer to ensure we don't conflict with the drawing thread. */
 			GdiFlush();
 			/* Release the thread while sleeping */
 			if (_draw_threaded) draw_lock.unlock();
 			if (_draw_mutex != nullptr) draw_lock.unlock();
 			CSleep(1);
 			if (_draw_threaded) draw_lock.lock();
 			NetworkDrawChatMessage();
 			DrawMouseCursor();
 			if (_draw_mutex != nullptr) draw_lock.lock();
+		}
+	}

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