658 lines
11 KiB
ArmAsm
658 lines
11 KiB
ArmAsm
mod7_table = $1c00
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div7_table = $1d00
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hposn_low = $1e00
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hposn_high = $1f00
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;==========================
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; draw box scene
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;==========================
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; data in INL/INH
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SET_COLOR = $C0 ; special case, color 0..15 in bottom nybble
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END = $80 ; 0 :
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CLEAR = $81 ; 0 : clear screen to black (0)
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BOX = $82 ; 4 : x1,y1 to x2,y2
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HLIN = $83 ; 3 : x1,x2 at y1
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VLIN = $84 ; 3 : at x1 from y1 to y2
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PLOT = $85 ; 2 : x1,y1
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HLIN_ADD= $86 ; 2 : x1,x2 at prev_y1+1
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HLIN_ADD_LSAME= $87 ; 1 : prev_x1,x2 at prev_y1+1
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HLIN_ADD_RSAME= $88 ; 1 : x1,prev_x2 at prev_y1+1
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BOX_ADD= $89 ; 3 : x1,prev_y1+1, x2, y2
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BOX_ADD_LSAME= $8A ; 2 : prev_x1,prev_y1+1, x2, y2
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BOX_ADD_RSAME= $8B ; 2 : x1,prev_y1+1, prev_x2, y2
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VLIN_ADD= $8C ; 2 : at prev_x1+1 from y1 to y2
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BLACK = $00
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RED = $01
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DARK_BLUE = $02
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MAGENTA = $03
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GREEN = $04
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GREY1 = $05
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MEDIUM_BLUE = $06
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LIGHT_BLUE = $07
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BROWN = $08
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ORANGE = $09
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GREY2 = $0A
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PINK = $0B
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LIGHT_GREEN = $0C
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YELLOW = $0D
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AQUA = $0E
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WHITE = $0f
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; top bit not set, command
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; top bit set, repeat last command
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; ??xx xxxx
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; 00 = co-ord
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; 10 = new command
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; 11 = new-color
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draw_scene:
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lda #0 ; always clear to black
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; sta COLOR
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sta clear_all_color+1
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jsr clear_all
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draw_scene_loop:
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wait_delay_smc:
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lda #200
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jsr wait
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ldy #0
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lda (INL),Y ; load next byte
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bpl repeat_last ; if top bit 0, repeat last
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; command
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asl ; clear top bit
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bmi set_color ; if negative, color
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lsr ; shift back down
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sta LAST_TYPE ; store last type
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jsr inc_inl ; 16 bit increment
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repeat_last:
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lda LAST_TYPE
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beq done_scene ; if 0, END
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; use jump table for rest
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and #$3f
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tax
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dex ; types start at 1
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lda draw_table_h,X
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sta table_jsr_smc+2
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; pha
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lda draw_table_l,X
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; pha
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sta table_jsr_smc+1
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table_jsr_smc:
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jsr $FFFF
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;========================================
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; adds A to input pointer and continues
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update_pointer:
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ldx LAST_TYPE
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lda bytes_used,X
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update_pointer_already_in_a:
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clc
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adc INL
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sta INL
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lda #0
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adc INH
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sta INH
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bcc draw_scene_loop ; bra (would only be set if wrap $FFFF)
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;============================
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; done scene
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;============================
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; return
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done_scene:
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rts
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;============================
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; set color
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;============================
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; color is A*2h
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set_color:
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; make top and bottom byte the same
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lsr ; shift back down
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and #$f
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sta COLOR
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asl
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asl
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asl
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asl
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adc COLOR
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sta COLOR
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; special case as we are encoded differently from
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; the actions
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lda #1 ; we were one byte long
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bne update_pointer_already_in_a ; bra
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bytes_used:
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.byte 0,0,4,3 ; END, CLEAR, BOX, HLIN
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.byte 3,2,2,1 ; VLIN, PLOT, HLIN_ADD, HLIN_ADD_LSAME
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.byte 1,3,2,2 ; HLIN_ADD_RSAME, BOX_ADD, BOX_ADD_LSAME
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.byte 2,2 ; BOX_ADD_RSAME, VLIN_ADD
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draw_table_l:
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.byte <(clear_screen),<(draw_box),<(draw_hlin),<(draw_vlin)
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.byte <(draw_plot)
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.byte <(draw_hlin_add),<(draw_hlin_add_lsame),<(draw_hlin_add_rsame)
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.byte <(draw_box_add),<(draw_box_add_lsame),<(draw_box_add_rsame)
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.byte <(draw_vlin_add)
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draw_table_h:
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.byte >(clear_screen),>(draw_box),>(draw_hlin),>(draw_vlin)
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.byte >(draw_plot)
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.byte >(draw_hlin_add),>(draw_hlin_add_lsame),>(draw_hlin_add_rsame)
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.byte >(draw_box_add),>(draw_box_add_lsame),>(draw_box_add_rsame)
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.byte >(draw_vlin_add)
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;=================================
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;=================================
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; clear screen
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;=================================
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;=================================
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clear_screen:
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lda COLOR
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sta clear_all_color+1
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jmp clear_all ; tail call
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;=================================
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;=================================
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; draw box
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;=================================
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;=================================
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; blurgh. Cases
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; Y1=EVEN, Y2=ODD -> loop Y1/2 to Y2/2, inclusive
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; Y1=ODD, Y2=ODD -> HLIN, loop (Y1/2)+1 to Y2/2 inclusive
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; Y1=EVEN, Y2=EVEN-> loop Y1/2 to (Y2/2)-1, HLIN
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; Y1=ODD, Y2=EVEN -> HLIN, loop (Y1/2)+1 to (Y2/2)-1, HLIN
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; 2/3 case, 1 to 1
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; 3/5 case, (>1) 2 to 2
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; 2/4 case, 1 to 1 (<2)
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; 3/4 case, 2 to 1 (!)
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; 3/6 case, 2 to 2
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draw_box:
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lda (INL),Y
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sta X1
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iny
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lda (INL),Y
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sta Y1
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iny
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draw_box_common_x2:
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lda (INL),Y
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sta X2
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;==================================
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; draw box common
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;==================================
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draw_box_common:
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iny
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lda (INL),Y
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sta Y2 ; keep even though not necessary
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lsr
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; if even, go to one less
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; else, fine
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bcs odd_bottom_draw_box
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even_bottom_draw_box:
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sec
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sbc #1
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odd_bottom_draw_box:
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sta draw_box_yend_smc+1
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; see if we start at multiple of two
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lda Y1
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lsr
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tay
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bcc even_draw_box_start
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; we're odd, need to call HLIN
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jsr hlin_mask_odd
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iny
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even_draw_box_start:
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draw_box_yloop:
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draw_box_yend_smc:
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cpy #0
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bcc bbbb
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beq bbbb
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jmp done_draw_box_yloop ; bge
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bbbb:
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lda gr_offsets_l,Y
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sta draw_box_xloop_smc+1
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lda gr_offsets_h,Y
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clc
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adc DRAW_PAGE
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sta draw_box_xloop_smc+2
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lda COLOR
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ldx X2
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draw_box_xloop:
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draw_box_xloop_smc:
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sta $400,X
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dex
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cpx X1
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bpl draw_box_xloop ; bge (signed)
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iny
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jmp draw_box_yloop
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done_draw_box_yloop:
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; done
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; if Y2 was even we need to fixup and draw one more line
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lda Y2
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lsr
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bcs definitely_odd_bottom
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jsr hlin_mask_even
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definitely_odd_bottom:
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; done
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rts
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;=================================
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;=================================
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; draw hlin
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;=================================
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;=================================
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draw_hlin:
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lda (INL),Y
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sta X1
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iny
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lda (INL),Y
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sta X2
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iny
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lda (INL),Y
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sta Y1 ; needed for HLIN_ADD
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;===================================
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;===================================
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; hlin common code
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;===================================
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;===================================
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; X1, X2 set up
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; Y-coord is in A
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; Y is A/2
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hlin_common:
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lsr
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tay
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bcc hlin_mask_even
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hlin_mask_odd:
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lda #$0F
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.byte $2C ; bit trick
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hlin_mask_even:
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lda #$F0
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sta MASK
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eor #$FF
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and COLOR
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sta COLOR2
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lda gr_offsets_l,Y
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sta draw_hlin_l_xloop_smc+1
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sta draw_hlin_s_xloop_smc+1
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lda gr_offsets_h,Y
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clc
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adc DRAW_PAGE
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sta draw_hlin_l_xloop_smc+2
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sta draw_hlin_s_xloop_smc+2
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ldx X2
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draw_hlin_xloop:
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draw_hlin_l_xloop_smc:
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lda $400,X
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and MASK
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ora COLOR2
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draw_hlin_s_xloop_smc:
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sta $400,X
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dex
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cpx X1
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bpl draw_hlin_xloop ; bge
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done_hlin_xloop:
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rts
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;=================================
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;=================================
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; draw hlin add
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;=================================
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;=================================
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; increment Y1
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draw_hlin_add:
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lda (INL),Y
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sta X1
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iny
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draw_hlin_add_lsame:
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lda (INL),Y
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sta X2
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hlin_inc_y1:
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inc Y1
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lda Y1
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jmp hlin_common
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;=================================
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;=================================
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; draw hlin add_lsame
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;=================================
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;=================================
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; increment Y1
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; use old left value
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;draw_hlin_add_lsame:
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; lda (INL),Y
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; sta X2
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; jmp hlin_inc_y1
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;=================================
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;=================================
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; draw hlin add_rsame
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;=================================
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;=================================
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; increment Y1
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; use old right value
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draw_hlin_add_rsame:
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lda (INL),Y
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sta X1
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jmp hlin_inc_y1
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;=================================
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;=================================
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; draw box add
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;=================================
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;=================================
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; increment Y2, put into Y1
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draw_box_add:
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lda Y2
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sta Y1
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inc Y1
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lda (INL),Y
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sta X1
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iny
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jmp draw_box_common_x2
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;=================================
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;=================================
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; draw box add_lsame
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;=================================
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;=================================
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; increment Y2, store in Y1
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; use old X1 value
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draw_box_add_lsame:
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lda Y2
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sta Y1
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inc Y1
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jmp draw_box_common_x2
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;=================================
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;=================================
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; draw box add_rsame
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;=================================
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;=================================
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; increment Y2, put in Y1
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; use old right value X2
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draw_box_add_rsame:
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lda Y2
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sta Y1
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inc Y1
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lda (INL),Y
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sta X1
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jmp draw_box_common
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;=================================
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;=================================
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; draw vlin add
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;=================================
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;=================================
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draw_vlin_add:
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inc X1 ; X1 is prev_X1+1
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bne draw_vlin_skip_x1 ; bra
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;=================================
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;=================================
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; draw vlin
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;=================================
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;=================================
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draw_vlin:
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lda (INL),Y
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sta X1
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iny
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draw_vlin_skip_x1:
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lda (INL),Y
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sta Y1
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iny
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lda (INL),Y
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sta Y2
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;================================
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draw_vlin_common:
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lda Y2
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lsr
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; if even, go to one less
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; else, fine
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bcs odd_bottom_vlin
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even_bottom_vlin:
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sec
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sbc #1
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odd_bottom_vlin:
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sta vlin_yend_smc+1
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; handle top
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; see if we start at multiple of two
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lda Y1
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lsr
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tay ; needed! Sets Y for vlin_yloop
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bcc even_vlin_start
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odd_vlin_start:
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; we're odd, need to call PLOT
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lda Y1
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jsr plot_common
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iny ; update Y for vlin_yloop
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even_vlin_start:
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vlin_yloop:
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vlin_yend_smc:
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cpy #0
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bcc cccc
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beq cccc
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jmp done_vlin_yloop ;
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cccc:
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lda gr_offsets_l,Y
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sta vlin_xloop_smc+1
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lda gr_offsets_h,Y
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clc
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adc DRAW_PAGE
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sta vlin_xloop_smc+2
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lda COLOR
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ldx X1
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vlin_xloop_smc:
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sta $400,X
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iny
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jmp vlin_yloop
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; done
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done_vlin_yloop:
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; if Y2 was even we need to fixup and draw one more line
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lda Y2
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lsr
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bcs definitely_odd_vlin
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lda Y2
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jmp plot_common ; plot_mask_even (tail call)
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definitely_odd_vlin:
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; done
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rts
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;=================================
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;=================================
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; draw plot
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;=================================
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;=================================
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draw_plot:
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lda (INL),Y
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sta X1
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iny
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lda (INL),Y
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sta Y1 ; needed for HLIN_ADD
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; fallthrough
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;===================================
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;===================================
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; plot common code
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;===================================
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;===================================
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; X-coord in X1
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; Y-coord in A
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; Y is Y-coord/2 at end
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plot_common:
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lsr ; need Y-coord/2 because 2 rows per byte
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tay
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bcc plot_mask_even
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plot_mask_odd:
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lda #$0F
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.byte $2C ; bit trick
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plot_mask_even:
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lda #$F0
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sta MASK
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eor #$FF
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and COLOR
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sta COLOR2
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lda gr_offsets_l,Y
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sta plot_l_smc+1
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sta plot_s_smc+1
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lda gr_offsets_h,Y
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clc
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adc DRAW_PAGE
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sta plot_l_smc+2
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sta plot_s_smc+2
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ldx X1
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plot_l_smc:
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lda $400,X
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and MASK
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ora COLOR2
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plot_s_smc:
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sta $400,X
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rts
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;===========================
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; 16-bit increment of INL
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; inline this?
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inc_inl:
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inc INL
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bne done_inc_inl
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inc INH
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done_inc_inl:
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rts
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;.include "gr_fast_clear.s"
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gr_offsets_l:
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|
.byte <$400,<$480,<$500,<$580,<$600,<$680,<$700,<$780
|
|
.byte <$428,<$4a8,<$528,<$5a8,<$628,<$6a8,<$728,<$7a8
|
|
.byte <$450,<$4d0,<$550,<$5d0,<$650,<$6d0,<$750,<$7d0
|
|
|
|
gr_offsets_h:
|
|
.byte >$400,>$480,>$500,>$580,>$600,>$680,>$700,>$780
|
|
.byte >$428,>$4a8,>$528,>$5a8,>$628,>$6a8,>$728,>$7a8
|
|
.byte >$450,>$4d0,>$550,>$5d0,>$650,>$6d0,>$750,>$7d0
|
|
|
|
;0123456789012345678901234567890123456789
|
|
|