dos33fsprogs/pt3_player/pt3_player.s
Vince Weaver dcdb88311a pt3: minor whitespace changes
chasing some sort of weird issue where PAGE2 left set on reset
Not sure what it was
2019-06-18 13:43:33 -04:00

745 lines
12 KiB
ArmAsm

;===============
; VMW PT3 Player
;===============
; zero page definitions
.include "zp.inc"
.include "hardware.inc"
; Location the files load at.
; If you change this, you need to update the Makefile
PT3_LOC = $4000
; Number of files. Should probably detect this automatically
NUM_FILES = 18
;=============================
; Setup
;=============================
pt3_setup:
jsr HOME
jsr TEXT
bit LORES ; Lo-res graphics
bit SET_GR
bit TEXTGR ; split text/graphics
jsr clear_screens
;===============================
; Check for Apple II/II+/IIe/IIc
;===============================
; this is used to see if we have lowecase support
lda $FBB3 ; IIe and newer is $06
cmp #6
beq apple_iie_or_newer
lda #$d0 ; set if older than a IIe
sta apple_ii_smc
bne done_apple_detect ; branch always
apple_iie_or_newer:
lda $FBC0 ; 0 on a IIc
bne done_apple_detect
apple_iic:
; activate IIc mockingboard?
; this might only be necessary to allow detection
; I get the impression the Mockingboard 4c activates
; when you access any of the 6522 ports in Slot 4
lda #$ff
sta $C403
sta $C404
; bypass the firmware interrupt handler
; should we do this on IIe too? probably faster
sei ; disable interrupts
lda $c08b ; disable ROM (enable language card)
lda $c08b
lda #<interrupt_handler
sta $fffe
lda #>interrupt_handler
sta $ffff
lda #$EA ; nop out the "lda $45" in the irq hand
sta interrupt_smc
sta interrupt_smc+1
done_apple_detect:
;===============
; Init disk code
;===============
jsr rts_init
;===============
; init variables
;===============
lda #0
sta DRAW_PAGE
sta DONE_PLAYING
sta WHICH_FILE
sta LOOP
;=======================
; Detect mockingboard
;========================
; Note, we do this, but then ignore it, as sometimes
; the test fails and then you don't get music.
; In theory this could do bad things if you had something
; easily confused in slot4, but that's probably not an issue.
; print detection message
; lda #<mocking_message ; load loading message
; sta OUTL
; lda #>mocking_message
; sta OUTH
; jsr move_and_print ; print it
jsr mockingboard_detect_slot4 ; call detection routine
cpx #$1
beq mockingboard_found
lda #<not_message ; if not found, print that
sta OUTL
lda #>not_message
sta OUTH
inc CV
jsr move_and_print
; jmp forever_loop ; and wait forever
mockingboard_found:
; lda #<found_message ; print found message
; sta OUTL
; lda #>found_message
; sta OUTH
; inc CV
; jsr move_and_print
;============================
; Init the Mockingboard
;============================
jsr mockingboard_init
jsr reset_ay_both
jsr clear_ay_both
;=========================
; Setup Interrupt Handler
;=========================
; Vector address goes to 0x3fe/0x3ff
; FIXME: should chain any existing handler
lda #<interrupt_handler
sta $03fe
lda #>interrupt_handler
sta $03ff
;============================
; Enable 50Hz clock on 6522
;============================
sei ; disable interrupts just in case
lda #$40 ; Continuous interrupts, don't touch PB7
sta $C40B ; ACR register
lda #$7F ; clear all interrupt flags
sta $C40E ; IER register (interrupt enable)
lda #$C0
sta $C40D ; IFR: 1100, enable interrupt on timer one oflow
sta $C40E ; IER: 1100, enable timer one interrupt
lda #$E7
sta $C404 ; write into low-order latch
lda #$4f
sta $C405 ; write into high-order latch,
; load both values into counter
; clear interrupt and start counting
; 4fe7 / 1e6 = .020s, 50Hz
;==================
; load first song
;==================
jsr new_song
;============================
; Init Background
;============================
jsr set_gr_page0
jsr fire_init
;============================
; Enable 6502 interrupts
;============================
start_interrupts:
cli ; clear interrupt mask
;============================
; Loop forever
;============================
main_loop:
; Do the visualization
jsr draw_fire_frame
jsr put_letters
jsr page_flip
check_done:
lda DONE_PLAYING
asl ; bit 7 to carry, bit 6 to bit 7
beq main_loop ; if was all zeros, loop
bcs main_loop ; if high bit set, paused
sei ; disable interrupts
bmi minus_song ; if bit 6 set, then left pressed
; else, either song finished or
; right pressed
plus_song:
jsr increment_file
bcc done_play ; branch always
minus_song:
jsr decrement_file
done_play:
lda #0
sta DONE_PLAYING
; clear the flame
; FIXME: doesn't matter as we aren't displaying right now
jsr fire_setline
jsr new_song
; re-enable the flame
lda #7
jsr fire_setline
bmi start_interrupts
;========================================
;========================================
; Helper routines below
;========================================
;========================================
;=================
; load a new song
;=================
new_song:
;=========================
; Init Variables
;=========================
; ?
;===========================
; Print loading message
;===========================
jsr clear_bottoms ; clear bottom of page 0/1
lda #0 ; print LOADING message
sta CH
lda #21
sta CV
lda #<loading_message
sta OUTL
lda #>loading_message
sta OUTH
jsr print_both_pages
;===========================
; Load in PT3 file
;===========================
jsr get_filename
lda #8 ; print filename to screen
sta CH
;lda #21
;sta CV
lda INL
sta OUTL
lda INH
sta OUTH
jsr print_both_pages
; needs to be space-padded $A0 30-byte filename
lda #<readfile_filename
sta namlo
lda #>readfile_filename
sta namhi
ldy #0
ldx #30 ; 30 chars
name_loop:
lda (INL),Y
beq space_loop
ora #$80
sta (namlo),Y
iny
dex
bne name_loop
beq done_name_loop
space_loop:
lda #$a0 ; pad with ' '
sta (namlo),Y
iny
dex
bne space_loop
done_name_loop:
; open and read a file
; loads to whatever it was BSAVED at (default is $4000)
jsr read_file ; read PT3 file from disk
;=========================
; Print Info
;=========================
jsr clear_bottoms ; clear bottom of page 0/1
; NUL terminate the strings we want to print
lda #0
sta PT3_LOC+$3E
sta PT3_LOC+$62
upcase:
; if Apple II/II+, uppercase the lowercase letters
apple_ii_smc:
beq no_uppercase
ldy #$1e
upcase_loop:
lda PT3_LOC,Y
cmp #$60
bcc not_lowercase ; blt
sbc #$20
sta PT3_LOC,Y
not_lowercase:
iny
cpy #$63
bne upcase_loop
no_uppercase:
; print title
lda #>(PT3_LOC+$1E) ; point to header title
sta OUTH
lda #<(PT3_LOC+$1E)
sta OUTL
lda #20 ; VTAB 20: HTAB 4
sta CV
lda #4
sta CH
jsr print_both_pages ; print, tail call
; Print Author
lda #<(PT3_LOC+$42)
sta OUTL
inc CV ; VTAB 21: HTAB 4
jsr print_both_pages ; print, tail call
; Print clock
lda #>(clock_string) ; point to clock string
sta OUTH
lda #<(clock_string)
sta OUTL
lda #23 ; VTAB 23: HTAB 13
sta CV
lda #13
sta CH
jsr print_both_pages ; print, tail call
; Print which file
; first update with current values
lda WHICH_FILE
adc #$1
ldy #0
jsr convert_decimal
lda #NUM_FILES
ldy #3
jsr convert_decimal
; now print modified string
lda #>(which_song_string) ; point to which song string
sta OUTH
lda #<(which_song_string)
sta OUTL
lda #0 ; HTAB 1
sta CH
jsr print_both_pages ; print, tail call
; Print MHz indicator
lda #>(mhz_string) ; point to MHz string
sta OUTH
lda #<(mhz_string)
sta OUTL
lda #34 ; HTAB 34
sta CH
jsr print_both_pages ; print, tail call
; update the MHz indicator with current state
ldx #'0'+$80
lda convert_177_smc1
cmp #$18
beq done_MHz
ldx #'7'+$80
done_MHz:
stx $7F4
stx $BF4
; Print Left Arrow (INVERSE)
lda #'<'
sta $6D0
sta $AD0
lda #'-'
sta $6D1
sta $AD1
; Print Rright Arrow (INVERSE)
sta $6F6
sta $AF6
lda #'>'
sta $6F7
sta $AF7
jsr pt3_init_song
;=================================
; Calculate Length of Song
;=================================
; There's no easy way to do this? (???)
; We walk through the song counting frames
; We can't even do this quickly, as the number of frames
; per pattern can vary, and you have to parse a channel
; to see this, and channel data is varying-width and so
; you have to parse it all.
; Time is just number of frames/50Hz
sta current_pattern_smc+1
frame_count_loop_store:
sta current_line_smc+1
sta current_subframe_smc+1
frame_count_loop:
lda current_line_smc+1
ora current_subframe_smc+1
bne fc_pattern_good
; load a new pattern in
jsr pt3_set_pattern
lda DONE_SONG
bne done_counting
fc_pattern_good:
ldx current_subframe_smc+1 ;;ldx #(NOTE_STRUCT_SIZE*0)
bne fc_line_good
; we only calc length of chanel A, hopefully enough
lda #1
sta pt3_pattern_done_smc+1
; decode_note(&pt3->a,&(pt3->a_addr),pt3);
jsr decode_note
lda pt3_pattern_done_smc+1
bne fc_line_good
inc current_pattern_smc+1 ; increment pattern
bne frame_count_loop_store ; branch always
fc_line_good:
inc current_subframe_smc+1 ; subframe++
lda current_subframe_smc+1
eor pt3_speed_smc+1 ; if we hit pt3_speed, move to next
bne fc_do_frame
fc_next_line:
sta current_subframe_smc+1 ; reset subframe to 0
inc current_line_smc+1 ; and increment line
lda current_line_smc+1
eor #64 ; always end at 64.
bne fc_do_frame ; is this always needed?
fc_next_pattern:
sta current_line_smc+1 ; reset line to 0
inc current_pattern_smc+1 ; increment pattern
fc_do_frame:
inc time_frame_smc+1
time_frame_smc:
lda #$00
eor #50
bne frame_count_loop
sta time_frame_smc+1
; see if overflow low s
ldx $BD0+13+10
cpx #'9'+$80
bne inc_low_s
; see if overflow high s
ldx $BD0+13+9
cpx #'5'+$80
bne inc_high_s
inc $7D0+13+7
inc $BD0+13+7
ldx #'0'+$80-1
inc_high_s:
inx
stx $7D0+13+9
stx $BD0+13+9
clear_low_s:
ldx #'0'+$80-1
inc_low_s:
inx
stx $7D0+13+10
stx $BD0+13+10
inc_done:
fc_bayern:
bne frame_count_loop
done_counting:
; re-init, as we've run through it
lda #0
sta DONE_PLAYING
sta current_pattern_smc+1
jmp pt3_init_song
;==================
; Get filename
;==================
; WHICH_FILE holds number
; MAX_FILES has max
; Scroll through until find
; point INH:INL to it
get_filename:
ldy #0
lda #<song_list ; point to filename
sta INL
lda #>song_list
sta INH
ldx WHICH_FILE
beq filename_found
get_filename_loop:
inner_loop:
iny
lda (INL),Y
bne inner_loop
iny
dex
bne get_filename_loop
filename_found:
tya
clc
adc INL
sta INL
bcc skip_inh_inc
inc INH
skip_inh_inc:
rts
;===============================
; Increment file we want to load
;===============================
increment_file:
inc WHICH_FILE
lda WHICH_FILE
eor #NUM_FILES
bne done_increment
sta WHICH_FILE
done_increment:
rts
;===============================
; Decrement file we want to load
;===============================
decrement_file:
dec WHICH_FILE
bpl done_decrement
lda #(NUM_FILES-1)
sta WHICH_FILE
done_decrement:
rts
;=========================
; convert_decimal
;=========================
; convert byte (<100) to tens/ones decimal
; this is probably not the optimal way to do this
; value in A, output in ASCII+$80 in which_10s:which_1s
; trashes X
convert_decimal:
ldx #'0'+$80
stx which_1s_smc+1
stx which_10s_smc+1
tax ; special case zero
beq conv_decimal_done
conv_decimal_loop:
inc which_1s_smc+1
which_1s_smc:
lda #$d1
cmp #':'+$80
bne conv_decimal_not_10
lda #'0'+$80
sta which_1s_smc+1
inc which_10s_smc+1
conv_decimal_not_10:
dex
bne conv_decimal_loop
conv_decimal_done:
which_10s_smc:
lda #$d1
sta which_song_string,y
lda which_1s_smc+1
sta which_song_string+1,y
rts
;==========
; filenames
;==========
song_list:
.include "song_list.inc"
;=========
;routines
;=========
.include "gr_offsets.s"
.include "text_print.s"
.include "mockingboard_a.s"
.include "gr_fast_clear.s"
.include "pageflip.s"
.include "gr_setpage.s"
.include "qkumba_rts.s"
.include "keypress_minimal.s"
.include "interrupt_handler.s"
.include "pt3_lib.s"
.include "fire.s"
.include "random16.s"
.include "gr_putsprite.s"
.include "put_letters.s"
;=========
; strings
;=========
;mocking_message: .asciiz "LOOKING FOR MOCKINGBOARD IN SLOT #4"
not_message: .byte "NOT "
found_message: .asciiz "FOUND"
;done_message: .asciiz "DONE PLAYING"
loading_message: .asciiz "LOADING"
clock_string: .asciiz "0:00 / 0:00"
mhz_string: .asciiz "1.7MHZ"
which_song_string: .asciiz "00/00"