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https://github.com/lscharen/iigs-game-engine.git
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Add second set of oscillators to output to L and R channels
This commit is contained in:
Lucas Scharenbroich
parent
b2ead87d25
commit
f6371f914e
168
demos/smb/apu.s
168
demos/smb/apu.s
@ -287,16 +287,24 @@ setup_doc_registers
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jsr access_doc_registers
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ldx #pulse1_sound_settings
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ldx #pulse1_sound_settings_l
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jsr copy_register_config
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ldx #pulse1_sound_settings_r
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jsr copy_register_config
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ldx #pulse2_sound_settings
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ldx #pulse2_sound_settings_l
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jsr copy_register_config
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ldx #pulse2_sound_settings_r
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jsr copy_register_config
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ldx #triangle_sound_settings
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ldx #triangle_sound_settings_l
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jsr copy_register_config
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ldx #triangle_sound_settings_r
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jsr copy_register_config
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ldx #noise_sound_settings
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ldx #noise_sound_settings_l
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jsr copy_register_config
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ldx #noise_sound_settings_r
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jsr copy_register_config
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rep #$20
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@ -388,7 +396,7 @@ pulse2_oscillator = 2
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triangle_oscillator = 4
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noise_oscillator = 6
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default_freq = 800
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pulse1_sound_settings = *
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pulse1_sound_settings_l = *
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dfb $00+pulse1_oscillator,default_freq ; frequency low register
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dfb $20+pulse1_oscillator,default_freq/256 ; frequency high register
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dfb $40+pulse1_oscillator,0 ; volume register, volume = 0
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@ -396,7 +404,15 @@ pulse1_sound_settings = *
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dfb $c0+pulse1_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a0+pulse1_oscillator,0 ; mode register, set to free run
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pulse2_sound_settings = *
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pulse1_sound_settings_r = *
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dfb $01+pulse1_oscillator,default_freq ; frequency low register
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dfb $21+pulse1_oscillator,default_freq/256 ; frequency high register
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dfb $41+pulse1_oscillator,0 ; volume register, volume = 0
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dfb $81+pulse1_oscillator,3 ; wavetable pointer register, point to $0300 by default (50% duty cycle)
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dfb $c1+pulse1_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a1+pulse1_oscillator,$10 ; mode register, set to free run
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pulse2_sound_settings_l = *
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dfb $00+pulse2_oscillator,default_freq ; frequency low register
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dfb $20+pulse2_oscillator,default_freq/256 ; frequency high register
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dfb $40+pulse2_oscillator,0 ; volume register, volume = 0
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@ -404,7 +420,15 @@ pulse2_sound_settings = *
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dfb $c0+pulse2_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a0+pulse2_oscillator,0 ; mode register, set to free run
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triangle_sound_settings = *
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pulse2_sound_settings_r = *
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dfb $01+pulse2_oscillator,default_freq ; frequency low register
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dfb $21+pulse2_oscillator,default_freq/256 ; frequency high register
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dfb $41+pulse2_oscillator,0 ; volume register, volume = 0
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dfb $81+pulse2_oscillator,3 ; wavetable pointer register, point to $0300 by default (50% duty cycle)
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dfb $c1+pulse2_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a1+pulse2_oscillator,$10 ; mode register, set to free run
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triangle_sound_settings_l = *
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dfb $00+triangle_oscillator,default_freq ; frequency low register
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dfb $20+triangle_oscillator,default_freq/256 ; frequency high register
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dfb $40+triangle_oscillator,0 ; volume register, volume = 0
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@ -412,7 +436,15 @@ triangle_sound_settings = *
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dfb $c0+triangle_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a0+triangle_oscillator,0 ; mode register, set to free run
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noise_sound_settings = *
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triangle_sound_settings_r = *
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dfb $01+triangle_oscillator,default_freq ; frequency low register
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dfb $21+triangle_oscillator,default_freq/256 ; frequency high register
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dfb $41+triangle_oscillator,0 ; volume register, volume = 0
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dfb $81+triangle_oscillator,5 ; wavetable pointer register, point to $0500
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dfb $c1+triangle_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a1+triangle_oscillator,$10 ; mode register, set to free run
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noise_sound_settings_l = *
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dfb $00+noise_oscillator,default_freq ; frequency low register
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dfb $20+noise_oscillator,default_freq/256 ; frequency high register
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dfb $40+noise_oscillator,128 ; volume register, volume = 0
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@ -420,6 +452,15 @@ noise_sound_settings = *
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dfb $c0+noise_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a0+noise_oscillator,0 ; mode register, set to free run
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noise_sound_settings_r = *
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dfb $01+noise_oscillator,default_freq ; frequency low register
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dfb $21+noise_oscillator,default_freq/256 ; frequency high register
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dfb $41+noise_oscillator,128 ; volume register, volume = 0
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dfb $81+noise_oscillator,6 ; wavetable pointer register, point to $0600
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dfb $c1+noise_oscillator,0 ; wavetable size register, 256 byte length
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dfb $a1+noise_oscillator,$10 ; mode register, set to free run
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backup_interrupt_ptr ds 4
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apu_mode ds 2
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@ -703,22 +744,25 @@ update_doc_registers
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sta _apu_pulse1_last_period
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jsr get_pulse_freq ; return freq in 16-bit accumulator
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sep #$30
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ldx #$00+pulse1_oscillator
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stx sound_address
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sta sound_data
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jsr set_osc_register_pair
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; stx sound_address
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; sta sound_data
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ldx #$20+pulse1_oscillator
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stx sound_address
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; stx sound_address
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xba
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sta sound_data
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jsr set_osc_register_pair
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; sta sound_data
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:freq_end_pulse1 sep #$30 ; redundent, but avoids extra branches
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lda #$80+pulse1_oscillator
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sta sound_address
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ldx #$80+pulse1_oscillator
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; sta sound_address
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lda APU_PULSE1_REG1 ; Get the cycle duty bits
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jsr set_pulse_duty_cycle
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lda #$40+pulse1_oscillator
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sta sound_address
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ldx #$40+pulse1_oscillator
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; sta sound_address
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lda APU_PULSE1_REG1
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bit #PULSE_CONST_VOL_FLAG ; Check the constant volume bit
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bne :set_volume_pulse1
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@ -727,11 +771,12 @@ update_doc_registers
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:mute_pulse1
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sep #$30
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lda #$40+pulse1_oscillator
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sta sound_address
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ldx #$40+pulse1_oscillator
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; sta sound_address
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lda #0
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:set_volume_pulse1 jsr set_pulse_volume
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; Now do the second square wave
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lda APU_PULSE2_MUTE ; If the sweep muted the channel, no output
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bne :mute_pulse2
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@ -748,21 +793,23 @@ update_doc_registers
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jsr get_pulse_freq ; return freq in 16-bic accumulator
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sep #$30
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ldx #$00+pulse2_oscillator
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stx sound_address
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sta sound_data
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; stx sound_address
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; sta sound_data
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jsr set_osc_register_pair
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ldx #$20+pulse2_oscillator
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stx sound_address
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; stx sound_address
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xba
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sta sound_data
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; sta sound_data
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jsr set_osc_register_pair
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:freq_end_pulse2 sep #$30
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lda #$80+pulse2_oscillator
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sta sound_address
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ldx #$80+pulse2_oscillator
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; sta sound_address
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lda APU_PULSE2_REG1 ; Get the cycle duty bits
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jsr set_pulse_duty_cycle
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lda #$40+pulse2_oscillator
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sta sound_address
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ldx #$40+pulse2_oscillator
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; sta sound_address
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lda APU_PULSE2_REG1
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bit #PULSE_CONST_VOL_FLAG ; Check the constant volume bit
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bne :set_volume_pulse2
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@ -770,8 +817,8 @@ update_doc_registers
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bra :set_volume_pulse2
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:mute_pulse2
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sep #$30
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lda #$40+pulse2_oscillator
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sta sound_address
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ldx #$40+pulse2_oscillator
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; sta sound_address
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lda #0
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:set_volume_pulse2 jsr set_pulse_volume
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@ -802,23 +849,25 @@ update_doc_registers
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lsr
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sep #$30
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ldx #$00+triangle_oscillator
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stx sound_address
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sta sound_data
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; stx sound_address
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; sta sound_data
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jsr set_osc_register_pair
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ldx #$20+triangle_oscillator
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stx sound_address
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; stx sound_address
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xba
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sta sound_data
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; sta sound_data
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jsr set_osc_register_pair
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:freq_end_triangle sep #$30
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lda #$40+triangle_oscillator
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sta sound_address
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ldx #$40+triangle_oscillator
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; sta sound_address
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lda #12 ; Triangle is a bit softer than pulse channels
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bra :set_volume_triangle
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:mute_triangle
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sep #$30
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lda #$40+triangle_oscillator
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sta sound_address
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ldx #$40+triangle_oscillator
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; sta sound_address
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lda #0
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:set_volume_triangle jsr set_pulse_volume
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@ -828,24 +877,26 @@ update_doc_registers
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beq :mute_noise
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ldx #$00+noise_oscillator
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stx sound_address
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; stx sound_address
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lda APU_NOISE_CURRENT_PERIOD
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sta sound_data
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; sta sound_data
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jsr set_osc_register_pair
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ldx #$20+noise_oscillator
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stx sound_address
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; stx sound_address
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lda APU_NOISE_CURRENT_PERIOD+1
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sta sound_data
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; sta sound_data
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jsr set_osc_register_pair
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lda #$40+noise_oscillator
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sta sound_address
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ldx #$40+noise_oscillator
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; sta sound_address
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lda APU_NOISE_REG1
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bit #NOISE_CONST_VOL_FLAG ; Check the constant volume bit
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bne :set_volume_noise
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lda APU_NOISE_ENVELOPE
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bra :set_volume_noise
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:mute_noise
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lda #$40+noise_oscillator
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sta sound_address
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ldx #$40+noise_oscillator
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; sta sound_address
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lda #0
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:set_volume_noise
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and #$0F
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@ -860,7 +911,8 @@ update_doc_registers
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asl
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pha
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:high_pitch pla
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sta sound_data
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; sta sound_data
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jsr set_osc_register_pair
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:not_timer
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no_frame
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@ -875,17 +927,30 @@ no_frame
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clc
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rtl
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; X = addr
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; A = data
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set_osc_register_pair
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mx %11
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stx sound_address
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sta sound_data
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inc sound_address
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sta sound_data
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rts
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; X = addr
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; A = duty cycle select
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set_pulse_duty_cycle
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mx %11
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rol
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rol
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rol
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and #$03
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tax
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tay
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lda duty_cycle_page,x
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sta sound_data
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rts
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lda duty_cycle_page,y
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jmp set_osc_register_pair
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; sta sound_data
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; rts
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set_pulse_volume
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and #$0F
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@ -893,8 +958,9 @@ set_pulse_volume
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asl
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asl
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asl
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sta sound_data
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rts
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jmp set_osc_register_pair
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; sta sound_data
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; rts
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; This is a bit different because we actually calculate a scan rate directly to match the
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; rate at which new samples are read form DOC RAM to the period of the noise channel
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