mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-20 03:35:24 +00:00
332 lines
4.8 KiB
ArmAsm
332 lines
4.8 KiB
ArmAsm
; Not quite a raster-bar, but why not
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.include "zp.inc"
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;===========
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; CONSTANTS
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;===========
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ELEMENTS EQU 64
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;=====================
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; Rasterbars
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;=====================
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;================================
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; Clear screen and setup graphics
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;================================
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jsr clear_screens ; clear top/bottom of page 0/1
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jsr set_gr_page0
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;===============
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; Init Variables
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;===============
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lda #0 ; 2
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sta DRAW_PAGE ; 3
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sta SCREEN_Y
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;===========================
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;===========================
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; Main Loop
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;===========================
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;===========================
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raster_loop:
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; clear rows
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ldy #19 ; 2
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lda #0
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init_rows:
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sta row_color,Y
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dey
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bpl init_rows
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jsr clear_top
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;================
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; set colors
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lda #COLOR_BOTH_AQUA ; aqua
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sta COLOR
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ldy SCREEN_Y
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jsr set_row_color
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lda #COLOR_BOTH_MEDIUMBLUE ; medium blue
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sta COLOR
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iny
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jsr set_row_color
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lda #COLOR_BOTH_LIGHTGREEN ; light green
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sta COLOR
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iny
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jsr set_row_color
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lda #COLOR_BOTH_DARKGREEN ; green
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sta COLOR
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iny
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jsr set_row_color
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lda #COLOR_BOTH_YELLOW ; yellow
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sta COLOR
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iny
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jsr set_row_color
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lda #COLOR_BOTH_ORANGE ; orange
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sta COLOR
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iny
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jsr set_row_color
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lda #COLOR_BOTH_PINK ; pink
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sta COLOR
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iny
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jsr set_row_color
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lda #COLOR_BOTH_RED ; red
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sta COLOR
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iny
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jsr set_row_color
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;=================
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; draw rows
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ldy #19
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draw_rows_loop:
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lda row_color,Y
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sta COLOR
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tya
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pha
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asl
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ldy #39 ; 2
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sty V2 ; 3
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ldy #0 ; 2
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jsr hlin_double ; hlin y,V2 at A ; 63+(X*16)
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pla ; 4
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tay
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dey
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bpl draw_rows_loop
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;==================
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; flip pages
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;==================
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jsr page_flip ; 6
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;==================
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; delay?
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;==================
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;==================
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; update y pointer
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;==================
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ldy SCREEN_Y
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iny
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cpy #ELEMENTS
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bne not_there
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ldy #0
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not_there:
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sty SCREEN_Y
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;==================
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; loop forever
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;==================
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jmp raster_loop ; 3
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;===================
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; set_row_color
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;===================
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; color in COLOR
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; Y=offset
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; Y preserved?
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set_row_color:
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tya ; wrap y offset
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and #(ELEMENTS-1)
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tax
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lda fine_sine,X ; lookup sign value
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cpx #33 ; check if > pi and
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bpl sin_negative ; need to make negative
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sin_positive:
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clc ; shift right by 4, zero-extend
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ror
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clc
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ror
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clc
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ror
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clc
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ror
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clc
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adc #18 ; add in 18 to center on screen
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; lsr ; shift once more
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jmp sin_no_more
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; FIXME: precalculate as we shift same each time
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sin_negative:
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sec
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ror
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sec
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ror
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sec
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ror
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sec
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ror
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clc
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adc #18
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; lsr
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sin_no_more:
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pha
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lsr
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tax
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pla
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pha
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jsr put_color
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pla
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tax
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cpy 32
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beq no_inc
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bmi yes_inc
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dex
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dex
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yes_inc:
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inx
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no_inc:
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txa ; horrific
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pha
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lsr
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tax
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pla
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jsr put_color
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rts
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put_color:
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and #$1 ; see if even or odd
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beq even_line
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lda COLOR
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and #$f0
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sta COLOR2
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lda row_color,X
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and #$0f
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jmp done_line
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even_line:
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lda COLOR
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and #$0f
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sta COLOR2
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lda row_color,X
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and #$f0
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done_line:
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ora COLOR2
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sta row_color,X
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rts
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;===============================================
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; External modules
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;===============================================
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.include "../asm_routines/pageflip.s"
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.include "../asm_routines/gr_setpage.s"
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;.include "../asm_routines/keypress.s"
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.include "../asm_routines/gr_offsets.s"
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.include "../asm_routines/gr_fast_clear.s"
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.include "../asm_routines/gr_hlin.s"
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;======================
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; some arrays
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;======================
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row_color:
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.byte $00,$00,$00,$00,$00, $00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00, $00,$00,$00,$00,$00
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fine_sine:
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.byte $00 ; 0.000000
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.byte $19 ; 0.098017
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.byte $31 ; 0.195090
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.byte $4A ; 0.290285
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.byte $61 ; 0.382683
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.byte $78 ; 0.471397
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.byte $8E ; 0.555570
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.byte $A2 ; 0.634393
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.byte $B5 ; 0.707107
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.byte $C5 ; 0.773010
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.byte $D4 ; 0.831470
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.byte $E1 ; 0.881921
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.byte $EC ; 0.923880
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.byte $F4 ; 0.956940
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.byte $FB ; 0.980785
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.byte $FE ; 0.995185
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.byte $FF ; 1.000000
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.byte $FE ; 0.995185
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.byte $FB ; 0.980785
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.byte $F4 ; 0.956940
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.byte $EC ; 0.923880
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.byte $E1 ; 0.881921
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.byte $D4 ; 0.831470
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.byte $C5 ; 0.773010
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.byte $B5 ; 0.707107
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.byte $A2 ; 0.634393
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.byte $8E ; 0.555570
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.byte $78 ; 0.471397
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.byte $61 ; 0.382683
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.byte $4A ; 0.290285
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.byte $31 ; 0.195090
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.byte $19 ; 0.098017
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.byte $00 ; 0.000000
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.byte $E7 ; -0.098017
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.byte $CF ; -0.195090
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.byte $B6 ; -0.290285
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.byte $9F ; -0.382683
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.byte $88 ; -0.471397
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.byte $72 ; -0.555570
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.byte $5E ; -0.634393
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.byte $4B ; -0.707107
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.byte $3B ; -0.773010
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.byte $2C ; -0.831470
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.byte $1F ; -0.881921
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.byte $14 ; -0.923880
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.byte $0C ; -0.956940
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.byte $05 ; -0.980785
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.byte $02 ; -0.995185
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.byte $00 ; -1.000000
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.byte $02 ; -0.995185
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.byte $05 ; -0.980785
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.byte $0C ; -0.956940
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.byte $14 ; -0.923880
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.byte $1F ; -0.881921
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.byte $2C ; -0.831470
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.byte $3B ; -0.773010
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.byte $4B ; -0.707107
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.byte $5E ; -0.634393
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.byte $72 ; -0.555570
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.byte $88 ; -0.471397
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.byte $9F ; -0.382683
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.byte $B6 ; -0.290285
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.byte $CF ; -0.195090
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.byte $E7 ; -0.098017
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