Merge 49c47f2d29 into d19952cc11

Data/Sys/GameSettings/REX.ini

@@ -1,7 +1,12 @@
 # REXE01, REXP01, REXJ01 - Excite Truck
 
 [Core]
-# Values set here will override the main Dolphin settings.
+# The game has an undetected idle loop (normal race) or runs uncapped (menus, slow motion due to car crash),
+# which is equivalent to SyncOnSkipIdle already being False.
+# Setting it to False is meant to avoid any performance regression when using the speed hack.
+# Despite dual core not being very stable in this game, using the speed hack combined with True doesn't
+# seem to improve the stability, while also having dramatically worse performance.
+SyncOnSkipIdle = False
 
 [OnFrame]
 # Add memory patches to be applied every frame here.
@@ -10,4 +15,5 @@
 # Add action replay cheats here.
 
 [Video_Hacks]
+# Fixes trees appearing black.
 EFBToTextureEnable = False

Data/Sys/GameSettings/REXP01.ini

@@ -0,0 +1,38 @@
+# REXP01 - Excite Truck
+
+[OnFrame]
+# This game's logic runs at a fixed rate of 60 FPS. During normal
+# gameplay, the game checks how many physics steps take depending
+# on time passed, then going from a loop this many times.
+# (Note: during a car crash, the game runs in slow motion and
+# renders interpolated frames at an uncapped speed, which is worse.)
+
+# The complexity of this prevents Dolphin from idling,
+# meaning that if the emulated CPU is overclocked more than
+# necessary needed to run the game at a stable 60 FPS), the
+# emulation performance is going to be worse.
+#
+# The first line adds a call to `VIWaitForRetrace` (after
+# `GXSetDrawDone`) so that Dolphin can idle.
+#
+# However, because the wait for the physics update is completely
+# detached from the vblanks, the game will wait even *after*
+# `VIWaitForRetrace` (until one frame of lag happens: then there
+# will always be at least one physics step to do after that).
+# The second line skips the idle loop: this creates the conditions
+# so that, from the `VIWaitForRetrace` onwards, there's always a
+# physics step to take. (Thus, the loop is naturally skipped.)
+#
+# The main reason why this speed hack isn't enabled by default is
+# that it limits the frame rate to a dividend of the vblank rate.
+# Due to how demanding this game is on the Wii's CPU with default
+# clock settings, the speed hack will make the game constantly jump
+# between 60 and 30 FPS during a race. Thus, the wiki explains that
+# the speed hack is meant to be used with an overclocked emulated
+# CPU.
+$Speed hack (see wiki)
+0x802D2D00:dword:0x4BD87228
+0x80177FBC:dword:0x60000000
+
+[Patches_RetroAchievements_Verified]
+$Speed hack (see wiki)