mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-19 12:32:35 +00:00
355 lines
5.5 KiB
ArmAsm
355 lines
5.5 KiB
ArmAsm
; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
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; self modifying code to get some extra colors (pseudo 40x192 mode)
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; by deater (Vince Weaver) <vince@deater.net>
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; Zero Page
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FRAMEBUFFER = $00 ; $00 - $0F
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YPOS = $10
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YPOS_SIN = $11
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CH = $24
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CV = $25
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GBASL = $26
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GBASH = $27
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BASL = $28
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BASH = $29
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FRAME = $60
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BLARGH = $69
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DRAW_PAGE = $EE
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LASTKEY = $F1
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PADDLE_STATUS = $F2
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TEMP = $FA
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WHICH = $FB
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OUTL = $FE
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OUTH = $FF
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; Soft Switches
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KEYPRESS= $C000
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KEYRESET= $C010
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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PAGE0 = $C054 ; Page0
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PAGE1 = $C055 ; Page1
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LORES = $C056 ; Enable LORES graphics
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PADDLE_BUTTON0 = $C061
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PADDL0 = $C064
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PTRIG = $C070
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; ROM routines
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TEXT = $FB36 ;; Set text mode
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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start_rasterbars:
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;===================
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; init screen
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jsr TEXT
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jsr HOME
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bit KEYRESET
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;===================
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; init vars
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lda #0
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sta DRAW_PAGE
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;=============================
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; Load graphic page0
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; lda #$0c
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; sta BASH
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; lda #$00
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; sta BASL ; load image to $c00
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; lda WHICH
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; asl
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; asl ; which*4
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; tay
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; lda pictures,Y
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; sta GBASL
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; lda pictures+1,Y
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; sta GBASH
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; jsr load_rle_gr
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; lda #4
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; sta DRAW_PAGE
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; jsr gr_copy_to_current ; copy to page1
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; ; GR part
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; bit PAGE1
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; bit LORES ; 4
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; bit SET_GR ; 4
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; bit FULLGR ; 4
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; jsr wait_until_keypressed
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;=============================
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; Load graphic page1
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; lda #$0c
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; sta BASH
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; lda #$00
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; sta BASL ; load image to $c00
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; lda WHICH
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; asl
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; asl ; which*4
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; tay
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; lda pictures+2,Y
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; sta GBASL
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; lda pictures+3,Y
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; sta GBASH
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; jsr load_rle_gr
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; lda #0
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; sta DRAW_PAGE
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; jsr gr_copy_to_current
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; ; GR part
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; bit PAGE0
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; jsr wait_until_keypressed
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;==============================
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; setup graphics for vapor lock
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;==============================
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jsr vapor_lock
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; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go
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; GR part
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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jsr gr_copy_to_current ; 6+ 9292
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; 5070 + 4550 = 9620
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; 9292
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; 12
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; 6
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; ====
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; 310
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; - 3 for jmp
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; 307
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; Try X=9 Y=6 cycles=307
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ldy #6 ; 2
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loopA: ldx #9 ; 2
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loopB: dex ; 2
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bne loopB ; 2nt/3
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dey ; 2
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bne loopA ; 2nt/3
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jmp display_loop ; 3
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.align $100
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;================================================
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; Display Loop
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;================================================
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; each scan line 65 cycles
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; 1 cycle each byte (40cycles) + 25 for horizontal
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; Total of 12480 cycles to draw screen
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; Vertical blank = 4550 cycles (70 scan lines)
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; Total of 17030 cycles to get back to where was
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; We want to alternate between page1 and page2 every 65 cycles
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; vblank = 4550 cycles to do scrolling
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display_loop:
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.include "rasterbars_screen.s"
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;======================================================
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; We have 4550 cycles in the vblank, use them wisely
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;======================================================
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; 4550 -- VBLANK
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; -148 -- raster 16+6+126 = 148
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; -10 -- keypress
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;=======
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; 4392
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pad_time:
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; we erase, then draw
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; doing a blanket erase of all 128 lines would cost 3459 cycles!
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; move red
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ldy red_x ; 4
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lda movement_table,Y ; 4
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sta red_x ; 4
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and #$7f ; 2
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tax ; 2
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jsr draw_rasterbar ; 6+126
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; Try X=3 Y=209 cycles=4390 R2
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nop
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ldy #209 ; 2
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loop1: ldx #3 ; 2
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loop2: dex ; 2
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bne loop2 ; 2nt/3
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dey ; 2
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bne loop1 ; 2nt/3
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lda KEYPRESS ; 4
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bpl no_keypress ; 3
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jmp display_loop
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no_keypress:
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jmp display_loop ; 3
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;========================
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; Draw a rasterbar
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; unroll as memory is free! haha
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;========================
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; X is location
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; 2+22+24+24+24+24+6 = 126
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draw_rasterbar:
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; clear all lines
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ldy #0 ; 2
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;====
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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lda #$33 ; 2
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sta (OUTL),Y ; 6
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;============
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; 22
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inx ; 2
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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lda #$bb ; 2
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sta (OUTL),Y ; 6
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inx ; 2
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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lda #$ff ; 2
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sta (OUTL),Y ; 6
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inx
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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lda #$bb ; 2
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sta (OUTL),Y ; 6
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inx
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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lda #$33 ; 2
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sta (OUTL),Y ; 6
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rts ; 6
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;==================================
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; HLINE
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;==================================
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; Color in A
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; Y has which line
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hline:
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pha ; 3
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ldx gr_offsets,y ; 4+
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stx hline_loop+1 ; 4
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lda gr_offsets+1,y ; 4+
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clc ; 2
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adc DRAW_PAGE ; 3
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sta hline_loop+2 ; 4
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pla ; 4
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ldx #39 ; 2
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hline_loop:
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sta $5d0,X ; 38 ; 5
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dex ; 2
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bpl hline_loop ; 2nt/3
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rts ; 6
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;==========================
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; Clear gr screen
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;==========================
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; Color in A
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clear_gr:
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ldy #46
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clear_page_loop:
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jsr hline
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dey
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dey
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bpl clear_page_loop
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rts
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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.include "../asm_routines/gr_unrle.s"
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.include "../asm_routines/keypress.s"
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.align $100
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.include "rasterbars_table.s"
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.include "movement_table.s"
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.include "gr_copy.s"
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.include "vapor_lock.s"
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.include "delay_a.s"
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pictures:
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.word k_low,k_high
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.include "k_40_48d.inc"
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krg:
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.byte $0
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red_x: .byte $10
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