476 lines
7.4 KiB
ArmAsm
476 lines
7.4 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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sta WHICH
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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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; -582 -- erase 22+4*(8+6+126) = 582
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; -696 -- move+draw 4*(16+26+6+126) = 696
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; -10 -- keypress
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;=======
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; 3262
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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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;=========================
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; ERASE
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;=========================
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lda #$00 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 22
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; erase red
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lda 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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; erase yellow
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lda yellow_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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; erase green
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lda green_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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; erase red
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lda blue_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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;=========================
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; MOVE and DRAW
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;=========================
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;============
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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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;==========
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; 16
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; draw red
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lda #$33 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$bb ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============
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; move yellow
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ldy yellow_x ; 4
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lda movement_table,Y ; 4
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sta yellow_x ; 4
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and #$7f ; 2
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tax ; 2
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;==========
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; 16
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; draw yellow
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lda #$88 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$dd ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============
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; move green
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ldy green_x ; 4
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lda movement_table,Y ; 4
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sta green_x ; 4
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and #$7f ; 2
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tax ; 2
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;==========
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; 16
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; draw green
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lda #$44 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$cc ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============
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; move blue
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ldy blue_x ; 4
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lda movement_table,Y ; 4
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sta blue_x ; 4
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and #$7f ; 2
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tax ; 2
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;==========
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; 16
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; draw blue
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lda #$22 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$66 ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============================
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; WAIT for VBLANK to finish
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;============================
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; Try X=5 Y=105 cycles=3256 R6
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nop
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nop
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nop
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ldy #105 ; 2
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loop1: ldx #5 ; 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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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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smc_raster_color1_1:
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lda #$33 ; 2
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sta (OUTL),Y ; 6
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;============
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; 22
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inx ; 2
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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smc_raster_color2_1:
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lda #$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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smc_raster_color3_1:
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lda #$ff ; 2
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sta (OUTL),Y ; 6
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inx
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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smc_raster_color2_2:
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lda #$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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smc_raster_color1_2:
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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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.include "gr_simple_clear.s"
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.include "gr_offsets.s"
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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 rb_bg_low,rb_bg_high
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.include "rb_bg.inc"
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red_x: .byte $10
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yellow_x: .byte $20
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green_x: .byte $30
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blue_x: .byte $40
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