dos33fsprogs/music/chiptune_player/volume_bars.s
Vince Weaver b1238af49d re-arranged the entire directory structure
this will probably upset people
2021-01-05 15:29:31 -05:00

227 lines
4.0 KiB
ArmAsm

;==============================
;==============================
; Draw volume bars
;==============================
;==============================
volume_bars:
; hline Y,V2 at A
; top line
lda #COLOR_BOTH_GREY ; 2
sta COLOR ; remove for crazy effect ; 3
ldy #12 ; 2
lda #26 ; 2
sta V2 ; 3
lda #6 ; 2
jsr hlin_double ; 6
; 63+14*16=287
;=====================
; 307
; middle
lda #8 ; 2
middle_loop:
pha ; 3
cmp #8 ; 2
beq middle_black ; 2nt/3
cmp #26 ; 2
beq middle_black ; 2nt/3
cmp #10 ; 2
bne not_top ; 2nt/3
ldx #$3B ; pink/purple ; 2
stx A_COLOR ; 3
ldx #$7E ; light-blue/aqua ; 2
stx B_COLOR ; 3
ldx #$CD ; light-green/yellow ; 2
stx C_COLOR ; 3
jmp calc_volume ; 3
not_top:
ldx #COLOR_BOTH_RED ; 2
stx A_COLOR ; 3
ldx #COLOR_BOTH_DARKBLUE ; 2
stx B_COLOR ; 3
ldx #COLOR_BOTH_DARKGREEN ; 2
stx C_COLOR ; 3
calc_volume:
; 10 14/15 24-x = 14 PLUS=none, zero=bottom, neg=all
; 12 12/13 12
; 14 10/11 10
; 16 8/9 8
; 18 6/7 6
; 20 4/5 4
; 22 2/3 2
; 24 0/1 0
; FIXME: there must be a way to make this faster
mod_a:
pha ; 3
sec ; 2
eor #$ff ; negate ; 2
adc #24 ; 24-A ; 2
sec ; 2
sbc A_VOLUME ; 2
bmi mod_b ; 2nt/3
beq mod_a_bottom ; 2nt/3
mod_a_zero:
lda #0 ; 2
beq done_a ; 2nt/3
mod_a_bottom:
lda A_COLOR ; 2
and #$f0 ; 2
done_a:
sta A_COLOR ; 2
mod_b:
pla ; 4
pha ; 3
sec ; 2
eor #$ff ; negate ; 2
adc #24 ; 24-A ; 2
sec ; 2
sbc B_VOLUME ; 2
bmi mod_c ; 2nt/3
beq mod_b_bottom ; 2nt/3
mod_b_zero:
lda #0 ; 2
beq done_b ; 2nt/3
mod_b_bottom:
lda B_COLOR ; 3
and #$f0 ; 2
done_b:
sta B_COLOR ; 3
mod_c:
pla ; 4
pha ; 3
sec ; 2
eor #$ff ; negate ; 2
adc #24 ; 24-A ; 2
sec ; 2
sbc C_VOLUME ; 2
bmi mod_d ; 2nt/3
beq mod_c_bottom ; 2nt/3
mod_c_zero:
lda #0 ; 2
beq done_c ; 2nt/3
mod_c_bottom:
lda C_COLOR ; 3
and #$f0 ; 2
done_c:
sta C_COLOR ; 3
mod_d:
pla ; 4
jmp middle_color_done ; 3
middle_black:
ldx #COLOR_BOTH_BLACK ; 2
stx A_COLOR ; 3
stx B_COLOR ; 3
stx C_COLOR ; 3
middle_color_done:
; left border
ldy #COLOR_BOTH_GREY ; 2
sty COLOR ; 3
ldy #12 ; 2
sty V2 ; 3
ldy #12 ; 2
jsr hlin_double ; 6
; 63+1*16=79
; border space
lda #COLOR_BOTH_BLACK ; 2
sta COLOR ; 3
ldx #1 ; 2
jsr hlin_double_continue ; 10+1*16=27
; A volume
lda A_COLOR ; 3
sta COLOR ; 3
ldx #3 ; 2
jsr hlin_double_continue ; 10+3*16=58
; A space
lda #COLOR_BOTH_BLACK ; 2
sta COLOR ; 3
ldx #1 ; 2
jsr hlin_double_continue ; 6
; 10+1*16=27
; B volume
lda B_COLOR ; 3
sta COLOR ; 3
ldx #3 ; 2
jsr hlin_double_continue ; 6
; 10+3*16=58
; B space
lda #COLOR_BOTH_BLACK ; 2
sta COLOR ; 3
ldx #1 ; 2
jsr hlin_double_continue ; 6
; 10+1*16=27
; C volume
lda C_COLOR ; 3
sta COLOR ; 3
ldx #3 ; 2
jsr hlin_double_continue ; 6
; 10+3*16=58
; C space
lda #COLOR_BOTH_BLACK ; 2
sta COLOR ; 3
ldx #1 ; 2
jsr hlin_double_continue ; 6
; 10+1*16=27
; Right border
lda #COLOR_BOTH_GREY ; 2
sta COLOR ; 3
ldx #1 ; 2
jsr hlin_double_continue ; 6
; 10+1*16=27
pla ; 4
clc ; 2
adc #2 ; 2
cmp #28 ; 2
beq bottom_line ; 2nt/3
jmp middle_loop ; 3
bottom_line:
; bottom line
lda #COLOR_BOTH_GREY ; 2
sta COLOR ; 3
ldy #12 ; 2
lda #26 ; 2
sta V2 ; 3
lda #28 ; 2
jsr hlin_double ; 6
; 63+14*16=287
rts ; 6
; 309+ 684*10 + 313 = roughly worst case 7462