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A C64 Game - Step 96

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Endurion

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And a nice little update, Richard Bayliss added sounds effects. Now there's a SFX mode, toggle in the title screen with left/right.

step96.png

The effects are integrated in the player code as separate "songs". So we add a variable SFX_MODE and check it's value when we want to play an effect or start the music:

No music in title when SFX mode enabled: ;initialise music player ldx #0 ldy #0 lda SFX_MODE bne + lda #MUSIC_TITLE_TUNE jsr MUSIC_PLAYER

Play an effect is similar: lda SFX_MODE beq + lda #MUSIC_PICKUP jsr MUSIC_PLAYER+ /code] To toggle sfx mode move the joystick left/right in the title screen and display its state: ;switch through music/sfx mode lda #$04 bit JOYSTICK_PORT_II bne .NotLeftPressed lda LEFT_RELEASED beq .LeftPressed lda SFX_MODE eor #$01 sta SFX_MODE jsr DisplaySfxMode lda SFX_MODE beq + lda #MUSIC_PICKUP jmp +++ lda #MUSIC_TITLE_TUNE++ jsr MUSIC_PLAYER lda #0 jmp .LeftPressed.NotLeftPressed lda #1.LeftPressed sta LEFT_RELEASED lda #$08 bit JOYSTICK_PORT_II bne .NotRightPressed lda RIGHT_RELEASED beq .RightPressed lda SFX_MODE eor #$01 sta SFX_MODE jsr DisplaySfxMode lda SFX_MODE beq + lda #MUSIC_PICKUP jmp +++ lda #MUSIC_TITLE_TUNE++ jsr MUSIC_PLAYER lda #0 jmp .RightPressed.NotRightPressed lda #1.RightPressed sta RIGHT_RELEASED !zone DisplaySfxModeDisplaySfxMode lda SFX_MODE bne + lda #TEXT_MUSIC jmp .DisplaySfxMode+ lda #TEXT_SFX.DisplaySfxMode sta ZEROPAGE_POINTER_1 + 1 lda #34 sta PARAM1 lda #24 sta PARAM2 jmp DisplayText

Due to technical limitations in the player code there are not too many sounds, but there are enough to make it worthwile.



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Any chances to be able to modify the sound code in the future to allow sound effects and music to play at the same time? (though it probably won't be even remotely easy)

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The player code wasn't done by me; I only received the binary part, so I can't say on this one. Quite common with C64, the musician would program his own player code and compose in it.

 

However I had worked with a different musician who made sfx play over the music. You always have to keep in mind that the C64 has only 3 midi-like sound channels, and music is played via them as well. So usually the music is overlayed by a sound effect (which can sound good or awkward, depends pretty much on the composition).

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