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[BotW] Calculate FPS sum in FPS++ each frame

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The theory is that this should fix the Steam Deck speedup issue since it might be caused by the average FPS count not dealing well with removing super big outliers.

Theoretically the previous method could also due to floating point inaccuracies drift over time, so this might help with (super) long play sessions too.

T'was a cool way to calculate the FPS average though.
This commit is contained in:
Crementif 2022-05-15 03:41:54 +02:00
parent 2f65d4ab92
commit c25d816529
1 changed files with 24 additions and 17 deletions
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41
src/BreathOfTheWild/Mods/FPS++/patch_GameSpeed.asm
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@ -68,9 +68,6 @@ averageFPS0.5:
averageFPS0.5Inv:
.float 30/(2*((($advancedMode == 1) * $fpsLimitAdvanced) + (($advancedMode == 0) * $fpsLimitNormal)))
averageSum:
.float 30*$frameAverageAmount
buffer:
.float 30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 ; buffer can only store a max length of 32 frames
@ -142,22 +139,15 @@ fmuls f10, f12, f10 ; Multiply bus speed to have current fps in f10. (1/ticks
; Calculate the rolling average FPS over the last N amount of frames which are stored in the circular buffer
_calcAverageFPS:
lis r3, averageSum@ha ; Load the current average sum
lfs f7, averageSum@l(r3) ; ...into f7
; Store FPS value from this frame into the buffer first
lis r11, buffer@ha ; Load the address of buffer...
addi r11, r11, buffer@l ; ...into r11 for later
lis r12, bufferIndex@ha ; Load the offset to the current value
lwz r12, bufferIndex@l(r12) ; Load the current buffer offset
.int 0x7D4B652E ; Store the FPS value from this current frame in place of the old value
;stfsx f10, r11, r12 ; Cemu only supports the stfsx instruction on later versions, so use assembled instruction bytes for legacy support
.int 0x7d8b642e ; Load the value that's stored at the current index
;lfsx f12, r11, r12 ; Cemu only supports the lfsx instruction on the very latest version, so use assembled instruction bytes for legacy support
fsubs f7, f7, f12 ; Subtract this value from the current average sum
fadds f7, f7, f10 ; Add the FPS from this current frame
.int 0x7d4b652e ; Store the FPS value from this current frame in place of the old value
;stfsx f10, r11, r12 ; Cemu only supports the stfsx instruction on the very latest version, so use assembled instruction bytes for legacy support
stfs f7, averageSum@l(r3) ; Store this new average sum again
; Store the offset to the next buffer entry
; Then store the offset to the next buffer entry
lis r11, bufferIndexEnd@ha ; Load offset to the end of the averaging buffer
lwz r11, bufferIndexEnd@l(r11) ; ...into r11
addi r12, r12, 0x04 ; Add 0x04 to the current buffer index to have the next buffer index
@ -167,9 +157,26 @@ li r12, 0 ; Set the current index to 0 if the end of the buffer was reached
lis r3, bufferIndex@ha ; Load current buffer index
stw r12, bufferIndex@l(r3) ; ...into r12
lis r3, bufferSizeDivider@ha ; Load the buffer size divider
lfs f10, bufferSizeDivider@l(r3); ...into f10
fdivs f10, f7, f10 ; Divide the average FPS sum by the buffer size divider to get the average FPS
; Finally, loop over the whole buffer and create an average sum of FPS values
_calculateBuffer:
lis r12, const_0.0@ha ; Load 0 float value into address...
lfs f10, const_0.0@l(r12) ; ...and load it into f10 since it'll be used for counting the average sum
lis r12, buffer@ha ; Load the address of buffer...
addi r12, r12, buffer@l ; ...into r11 for later
lis r11, bufferIndexEnd@ha ; Load last index of the averaging buffer
lwz r11, bufferIndexEnd@l(r11) ; ...into r11
li r3, 0 ; Change r3 to 0 since it'll be used as the current index inside the buffer
startCalculateBufferLoop:
.int 0x7D8C1C2E ; Load FPS value from the buffer address (r12) + loop index (r3) into f12
; lfsx f12, r12, r3 ; Cemu only supports the lfsx instruction on later versions, so use assembled instruction bytes for legacy support
fadds f10, f10, f12 ; Add loaded FPS value from f12 to sum of FPS values in f10
addi r3, r3, 0x04 ; Add 0x04 to the current buffer index to have the next buffer index
cmpw r3, r11 ; Compare this new buffer index to the end index
blt startCalculateBufferLoop ; Loop back until the whole buffer is initialized with the value from
lis r3, bufferSizeDivider@ha ; When done with the loop, load the buffer size divider
lfs f7, bufferSizeDivider@l(r3) ; ...into f7
fdivs f10, f10, f7 ; Divide the average FPS sum by the buffer size divider to get the average FPS
; Calculates the gamespeed (which is stored in f10 regardless of average or static code path)
_setGamespeed: