mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-25 18:33:11 +00:00
174 lines
3.2 KiB
Plaintext
174 lines
3.2 KiB
Plaintext
EVENT__start = 1
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EVENT__postframe = 1
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EVENT__preframe = 1
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EVENT__playsound = 1
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EVENT__preframeloop = 1
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.scope SoundDemo
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.zeropage
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SoundChannel_sfx_b0:
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.res 1
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.res 1
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SoundChannel_timer_b0:
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.res 1
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.res 1
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TEMP:
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SoundEngine__2__tmp:
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.res 1
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.res 1
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.res 1
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.code
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SoundEffect_duration_b0:
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.byte 11
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SoundEffect_sounddata_b0:
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.byte <SoundEffect_sounddata_e0_b0
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SoundEffect_sounddata_b8:
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.byte >SoundEffect_sounddata_e0_b0
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SoundEffect_sounddata_e0_b0:
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.byte 2
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.byte 3
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.byte 4
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.byte 8
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.byte 16
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.byte 32
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.byte 16
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.byte 32
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.byte 16
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.byte 8
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.byte 168
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SoundDemo__INITDATA:
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.byte 0
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.byte 0
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.byte 0
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.byte 0
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__Start:
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;;; start action Init__main_init__1
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.include "vcs-ca65.h"
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.macpack longbranch
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.define PAL 0
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__NMI:
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__Reset:
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__BRK:
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CLEAN_START
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ldy #4
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: lda SoundDemo__INITDATA-1,y
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sta SoundChannel_sfx_b0-1,y
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dey
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bne :-
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;;; start action FrameLoop__start__3
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;;; start action Test__preframeloop__5
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;;; start action SoundEngine__playsound__7
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; arg 0 = sound channel
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ldy #0
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; arg 1 = sound effect #
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lda #0
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sta SoundChannel_sfx_b0,y
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tax
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;;; end action SoundEngine__playsound__7
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;;; start action SoundEngine__playsound__10
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lda SoundEffect_duration_b0,x
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;;; end action SoundEngine__playsound__10
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;;; start action SoundEngine__playsound__13
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sta SoundChannel_timer_b0,y
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; arg 2 = base volume
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lda #15
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sta AUDV0,y
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;;; end action SoundEngine__playsound__13
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;;; end action Test__preframeloop__5
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FrameLoop__start__4__NextFrame:
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FRAME_END
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FRAME_START
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;;; start action SoundEngine__preframe__16
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ldy #0
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SoundEngine__preframe__17____each:
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ldx SoundChannel_sfx_b0,y
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lda SoundChannel_timer_b0,y
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jeq SoundEngine__preframe__18__nosound
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sec
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sbc #1
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sta SoundChannel_timer_b0,y
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pha
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lda SoundEffect_sounddata_b0,x
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sta SoundEngine__2__tmp+0
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lda SoundEffect_sounddata_b8,x
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sta SoundEngine__2__tmp+1 ; save pointer to sound data
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sty SoundEngine__2__tmp+2 ; save Y (sound channel #)
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pla
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tay
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lda (SoundEngine__2__tmp+0),y ; get sound data
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bpl SoundEngine__preframe__18__setfreq ; hi bit clear = just freq
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ldy SoundEngine__2__tmp+2
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lsr ; right shift (/ 2)
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bcs SoundEngine__preframe__18__setvol ; lo bit set = volume
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sta AUDC0,y ; lo bit clear = control
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lsr ; also set freq (/ 2)
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SoundEngine__preframe__18__setfreq:
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ldy SoundEngine__2__tmp+2
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sta AUDF0,y ; set frequency
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jmp SoundEngine__preframe__18__done
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SoundEngine__preframe__18__nosound:
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lda #0
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SoundEngine__preframe__18__setvol:
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sta AUDV0,y ; set volume
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SoundEngine__preframe__18__done:
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iny
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cpy #2
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jne SoundEngine__preframe__17____each
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SoundEngine__preframe__17____exit:
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;;; end action SoundEngine__preframe__16
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KERNEL_START
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KERNEL_END
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;;; start action FrameLoop__postframe__19
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lsr SWCHB ; test Game Reset switch
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bcs FrameLoop__postframe__20__NoStart
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FrameLoop__postframe__20__NoStart:
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;;; end action FrameLoop__postframe__19
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jmp FrameLoop__start__4__NextFrame ; loop to next frame
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;;; end action FrameLoop__start__3
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; start main routine
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.segment "VECTORS"
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ZeroByte: .byte $00
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Return: .byte $60
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VecNMI:
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VecReset: .word __Reset
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VecBRK: .word __BRK
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.code
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;;; end action Init__main_init__1
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.endscope
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SoundDemo__Start = SoundDemo::__Start |