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fix(libsointu): Return error as soon as possible, exiting the rendering loop immediately on error.

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Veikko Sariola 2020-12-05 20:53:22 +02:00
parent 7bb60de74e
commit cd95c5ae37
1 changed files with 9 additions and 5 deletions
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14
render.asm
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@ -159,6 +159,12 @@ EXPORT MANGLE_FUNC(su_render,16)
push _BX ; the nominal rowlength should be time_in push _BX ; the nominal rowlength should be time_in
xor eax, eax ; rowtick starts at 0 xor eax, eax ; rowtick starts at 0
su_render_samples_loop: su_render_samples_loop:
push _DI
fnstsw [_SP] ; store the FPU status flag to stack top
pop _DI ; _DI = FPU status flag
and _DI, 0011100001000101b ; mask TOP pointer, stack error, zero divide and invalid operation
test _DI,_DI ; all the aforementioned bits should be 0!
jne su_render_samples_time_finish ; otherwise, we exit due to error
cmp eax, [_SP] ; if rowtick >= maxtime cmp eax, [_SP] ; if rowtick >= maxtime
jge su_render_samples_time_finish ; goto finish jge su_render_samples_time_finish ; goto finish
mov ecx, [_SP + PTRSIZE*7] ; ecx = buffer length in samples mov ecx, [_SP + PTRSIZE*7] ; ecx = buffer length in samples
@ -207,11 +213,9 @@ su_render_samples_time_finish:
pop _DX pop _DX
pop _BX ; pop the pointer to time pop _BX ; pop the pointer to time
pop _SI ; pop the pointer to samples pop _SI ; pop the pointer to samples
mov dword [_SI], edx ; *samples = samples rendered mov dword [_SI], edx ; *samples = samples rendered
mov dword [_BX], eax ; *time = time ticks rendered mov dword [_BX], eax ; *time = time ticks rendered
xor eax, eax mov _AX,_DI ; _DI was the masked FPU status flag, _AX is return value
fnstsw ax ; store the FPU status flag in ax.
and ax, 0011100001000101b ; mask TOP pointer, stack error, zero divide and invalid operation
frstor [_SP] ; restore fpu state frstor [_SP] ; restore fpu state
add _SP,108 ; rewind the stack allocate for FPU state add _SP,108 ; rewind the stack allocate for FPU state
%if BITS == 32 ; stdcall %if BITS == 32 ; stdcall