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https://github.com/vsariola/sointu.git
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2ad61ff6b2
The preprocessing is done sointu-cli and (almost) nothing is done by the NASM preprocessor anymore (some .strucs are still there. Now, sointu-cli loads the .yml song, defines bunch of macros (go functions / variables) and passes the struct to text/template parses. This a lot more powerful way to generate .asm code than trying to fight with the nasm preprocessor. At the moment, tests pass but the repository is a bit of monster, as the library is still compiled using the old approach. Go should generate the library also from the templates.
44 lines
2.2 KiB
NASM
44 lines
2.2 KiB
NASM
{{- if not .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 }} |