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fix(sointulib): Reset the FPU on each call to render, seems to take away the undeterministic behaviour.

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This commit is contained in:
Veikko Sariola 2020-12-05 14:21:53 +02:00
parent e7ae775842
commit 83937bb2ee
1 changed files with 4 additions and 0 deletions
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4
render.asm
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@ -137,6 +137,8 @@ EXPORT MANGLE_FUNC(su_render,16)
mov rcx, rdi ; rcx = &Synthstate
%endif
%endif
sub _SP,108 ; allocate space on stack for the FPU state
fsave [_SP] ; save the FPU state to stack & reset the FPU
push _SI ; push the pointer to samples
push _BX ; push the pointer to time
xor eax, eax ; samplenumber starts at 0
@ -208,6 +210,8 @@ su_render_samples_time_finish:
mov dword [_SI], edx ; *samples = samples rendered
mov dword [_BX], eax ; *time = time ticks rendered
xor eax, eax ; TODO: set eax to possible error code, now just 0
frstor [_SP] ; restore fpu state
add _SP,108 ; rewind the stack allocate for FPU state
%if BITS == 32 ; stdcall
mov [_SP + 28],eax ; we want to return eax, but popad pops everything, so put eax to stack for popad to pop
popad