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pt3: remove pt3_version

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makes code slightly faster but also slightly bigger
This commit is contained in:
Vince Weaver 2019-06-05 12:45:10 -04:00
parent f8cfa2feb1
commit 6802663554
1 changed files with 19 additions and 6 deletions
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25
pt3_player/pt3_lib.s
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@ -18,6 +18,7 @@
; + 2839 bytes -- mask note command in common code
; + 2832 bytes -- combine $D0 and $E0 decode
; + 2816 bytes -- eliminate "decode_done" variable (2.75k)
; + 2817 bytes -- eliminate pt3_version. Slighly faster but also bigger
; TODO
; move some of these flags to be bits rather than bytes?
@ -210,8 +211,6 @@ note_c:
.byte $0 ; NOTE_TONE_SLIDE_TO_STEP
pt3_version: .byte $0 ; FIXME: make SMC
;====================================
; Global vars that must be preserved
@ -489,7 +488,20 @@ pt3_init_song:
tax ; 2
not_ascii_number:
stx pt3_version ; 3
; adjust version<6 SMC code in the slide code
; FIXME: I am sure there's a more clever way to do this
lda #$2C ; BIT ; 2
cpx #$6 ; 2
bcc version_less_than_6 ; blt ; 3
; carry is set
adc #$1F ; BIT->JMP 2C->4C ; 2
version_less_than_6:
sta version_smc ; 4
pick_volume_table:
;=======================
; Pick which volume number, based on version
@ -1512,9 +1524,10 @@ skip_step_inc1:
lda prev_note
sta note_a+NOTE_NOTE,X
lda pt3_version
cmp #$6
bcc weird_version ; blt
; implement file version 6 and above slide behavior
; this is done by SMC at song init time
version_smc:
jmp weird_version ; (JMP to BIT via smc) ; 3
lda prev_sliding_l
sta note_a+NOTE_TONE_SLIDING_L,X