mirror of
https://github.com/vsariola/sointu.git
synced 2025-06-04 01:28:45 -04:00
e4490faa2e
The working principle is similar as before with x86, but instead of outputting .asm, it outputs .wat. This can be compiled into .wasm by using the wat2wasm assembler.
44 lines
2.2 KiB
NASM
44 lines
2.2 KiB
NASM
{{- if not .Song.Output16Bit }}
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{{- if not .Clip }}
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mov {{.DI}}, [{{.Stack "OutputBufPtr"}}] ; edi containts ptr
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mov {{.SI}}, {{.PTRWORD}} su_synth_obj + su_synthworkspace.left
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movsd ; copy left channel to output buffer
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movsd ; copy right channel to output buffer
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mov [{{.Stack "OutputBufPtr"}}], {{.DI}} ; save back the updated ptr
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lea {{.DI}}, [{{.SI}}-8]
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xor eax, eax
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stosd ; clear left channel so the VM is ready to write them again
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stosd ; clear right channel so the VM is ready to write them again
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{{ else }}
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mov {{.SI}}, qword [{{.Stack "OutputBufPtr"}}] ; esi points to the output buffer
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xor ecx,ecx
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xor eax,eax
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%%loop: ; loop over two channels, left & right
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do fld dword [,su_synth_obj+su_synthworkspace.left,_CX*4,]
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{{.Call "su_clip"}}
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fstp dword [_SI]
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do mov dword [,su_synth_obj+su_synthworkspace.left,_CX*4,{],eax} ; clear the sample so the VM is ready to write it
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add _SI,4
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cmp ecx,2
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jl %%loop
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mov dword [_SP+su_stack.bufferptr - su_stack.output_sound], _SI ; save esi back to stack
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{{ end }}
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{{- else}}
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mov {{.SI}}, [{{.Stack "OutputBufPtr"}}] ; esi points to the output buffer
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mov {{.DI}}, {{.PTRWORD}} su_synth_obj+su_synthworkspace.left
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mov ecx, 2
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output_sound16bit_loop: ; loop over two channels, left & right
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fld dword [{{.DI}}]
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{{.Call "su_clip"}}
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{{- .Float 32767.0 | .Prepare | indent 16}}
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fmul dword [{{.Float 32767.0 | .Use}}]
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push {{.AX}}
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fistp dword [{{.SP}}]
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pop {{.AX}}
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mov word [{{.SI}}],ax ; // store integer converted right sample
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xor eax,eax
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stosd
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add {{.SI}},2
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loop output_sound16bit_loop
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mov [{{.Stack "OutputBufPtr"}}], {{.SI}} ; save esi back to stack
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{{- end }} |