455 lines
5.5 KiB
ArmAsm
455 lines
5.5 KiB
ArmAsm
; VGI Rectangle
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; VGI Rectangle test
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COLOR_MODE = TEMP1
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OTHER_MASK = TEMP2
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XRUN = TEMP3
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div7_table = $BE00
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mod7_table = $BF00
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USE_FAST = 1
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.if (USE_FAST=0)
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; slow
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;=================================
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; Simple Rectangle
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;=================================
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VGI_RCOLOR = P0
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VGI_RX1 = P1
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VGI_RY1 = P2
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VGI_RXRUN = P3
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VGI_RYRUN = P4
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vgi_simple_rectangle:
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simple_rectangle_loop:
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lda VGI_RCOLOR
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asl ; nibble swap by david galloway
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adc #$80
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rol
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asl
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adc #$80
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rol
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sta VGI_RCOLOR
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and #$f
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tax
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lda COLORTBL,X
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sta HGR_COLOR
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ldx VGI_RX1 ; X1 into X
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lda VGI_RY1 ; Y1 into A
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ldy #0 ; always 0
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jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
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lda VGI_RXRUN ; XRUN into A
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ldx #0 ; always 0
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ldy #0 ; relative Y is 0
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jsr HLINRL ; (X,A),(Y)
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inc VGI_RY1
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dec VGI_RYRUN
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bne simple_rectangle_loop
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jmp vgi_loop
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;=================================
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; Dithered Rectangle
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;=================================
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; VGI_RCOLOR = P0
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; VGI_RX1 = P1
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; VGI_RY1 = P2
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; VGI_RXRUN = P3
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; VGI_RYRUN = P4
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VGI_RCOLOR2 = P5
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vgi_dithered_rectangle:
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dithered_rectangle_loop:
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lda COUNT
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and #$1
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beq even_color
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odd_color:
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lda VGI_RCOLOR
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jmp save_color
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even_color:
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lda VGI_RCOLOR2
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save_color:
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sta HGR_COLOR
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inc COUNT
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ldx VGI_RX1 ; X1 into X
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lda VGI_RY1 ; Y1 into A
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ldy #0 ; always 0
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jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
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lda VGI_RXRUN ; XRUN into A
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ldx #0 ; always 0
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ldy #0 ; relative Y is 0
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jsr HLINRL ; (X,A),(Y)
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inc VGI_RY1
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dec VGI_RYRUN
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bne dithered_rectangle_loop
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jmp vgi_loop
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.else
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; FAST
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;=================================
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; Simple Rectangle
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;=================================
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VGI_RCOLOR = P0
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VGI_RX1 = P1
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VGI_RY1 = P2
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VGI_RXRUN = P3
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VGI_RYRUN = P4
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VGI_RCOLOR2 = P5 ; only for dither
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;==================================
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; VGI Simple Rectangle
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;==================================
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vgi_simple_rectangle:
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lda #0
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sta COLOR_MODE
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simple_rectangle_loop:
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lda COLOR_MODE
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beq simple_colors
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bmi striped_colors
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bpl handle_dither
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simple_colors:
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lda VGI_RCOLOR
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asl ; nibble swap by david galloway
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adc #$80
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rol
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asl
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adc #$80
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rol
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sta VGI_RCOLOR
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and #$f
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tax
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lda COLORTBL,X
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sta HGR_COLOR
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jmp done_colors
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handle_dither:
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lda COUNT
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and #$1
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beq deven_color
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dodd_color:
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lda VGI_RCOLOR
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jmp dsave_color
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deven_color:
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lda VGI_RCOLOR2
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dsave_color:
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sta HGR_COLOR
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inc COUNT
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jmp done_colors
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striped_colors:
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; don't need to do anything here?
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done_colors:
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; get ROW into (GBASL)
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ldx VGI_RX1 ; X1 into X
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lda VGI_RY1 ; Y1 into A
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ldy #0 ; always 0
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jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
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; Y is already the RX1/7
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; adjust color if in striped mode
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lda COLOR_MODE
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bpl not_striped
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jsr swap_colors
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not_striped:
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; copy the XRUN
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lda VGI_RXRUN
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sta XRUN
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inc XRUN ; needed because we compare with beq/bne
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; check if narrow corner case where begin and end same block
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; if RX%7 + XRUN < 8
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ldx VGI_RX1
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lda mod7_table,X
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clc
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adc XRUN
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cmp #8
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bcs not_corner
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corner:
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; want to use MASK of left_mask, MOD7 and 7-XRUN
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lda mod7_table,X
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tax
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lda (GBASL),Y
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eor HGR_BITS
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and left_masks,X
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ldx XRUN
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and right_masks,X
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eor (GBASL),Y
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sta (GBASL),Y
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jmp done_row ; that's all
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not_corner:
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; see if not starting on boundary
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ldx VGI_RX1
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lda mod7_table,X
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beq draw_run
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; handle not full left border
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tax
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lda (GBASL),Y
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eor HGR_BITS
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and left_masks,X
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eor (GBASL),Y
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sta (GBASL),Y
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iny ; move to next
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; adjust RUN length by 7- mod7
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txa ; load mod7
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eor #$ff
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sec
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adc #7
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eor #$ff
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sec
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adc XRUN
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sta XRUN
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; lda HGR_BITS ; cycle colors for next
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; jsr COLOR_SHIFT
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jsr swap_colors
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;no_shift:
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; draw common
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draw_run:
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lda XRUN
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cmp #7
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bcc draw_right ; blt
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lda HGR_BITS ; get color
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sta (GBASL),Y ; store out
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; jsr COLOR_SHIFT ; shift colors
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iny ; move to next block
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jsr swap_colors
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lda XRUN ; take 7 off the run
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sec
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sbc #7
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sta XRUN
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jmp draw_run
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; draw rightmost
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draw_right:
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beq done_row
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; lda HGR_BITS
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; jsr COLOR_SHIFT
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; see if not starting on boundary
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ldx XRUN
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tax
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lda (GBASL),Y
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eor HGR_BITS
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and right_masks,X
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eor (GBASL),Y
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sta (GBASL),Y
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done_row:
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inc VGI_RY1
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dec VGI_RYRUN
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;bne simple_rectangle_loop
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beq done_done
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jmp simple_rectangle_loop
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done_done:
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jmp vgi_loop
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;==========================
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; swap colors
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;==========================
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swap_colors:
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lda COLOR_MODE
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bmi swap_colors_striped
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lda HGR_BITS ; get color
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jsr COLOR_SHIFT ; shift colors
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rts
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swap_colors_striped:
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tya
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and #1
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bne swap_odd
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lda VGI_RCOLOR
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jmp swap_done
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swap_odd:
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lda VGI_RCOLOR2
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swap_done:
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sta HGR_BITS
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rts
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;=================================
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; Dithered Rectangle
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;=================================
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; VGI_RCOLOR = P0
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; VGI_RX1 = P1
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; VGI_RY1 = P2
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; VGI_RXRUN = P3
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; VGI_RYRUN = P4
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; VGI_RCOLOR2 = P5
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vgi_dithered_rectangle:
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lda #1
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sta COLOR_MODE
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lda #0
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sta COUNT
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jmp simple_rectangle_loop
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;=================================
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; Vertical Striped Rectangle
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;=================================
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; VGI_RCOLOR = P0
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; VGI_RX1 = P1
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; VGI_RY1 = P2
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; VGI_RXRUN = P3
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; VGI_RYRUN = P4
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; VGI_RCOLOR2 = P5
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vgi_vstripe_rectangle:
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lda #128
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sta COLOR_MODE
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lda #0
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sta COUNT
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jmp simple_rectangle_loop
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.endif
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;=====================
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; make /7 %7 tables
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;=====================
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vgi_init:
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vgi_make_tables:
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ldy #0
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lda #0
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ldx #0
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div7_loop:
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sta div7_table,Y
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inx
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cpx #7
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bne div7_not7
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clc
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adc #1
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ldx #0
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div7_not7:
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iny
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bne div7_loop
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ldy #0
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lda #0
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mod7_loop:
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sta mod7_table,Y
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clc
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adc #1
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cmp #7
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bne mod7_not7
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lda #0
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mod7_not7:
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iny
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bne mod7_loop
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rts
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left_masks:
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.byte $FF,$FE,$FC,$F8, $F0,$E0,$C0
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right_masks:
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.byte $81,$83,$87, $8F,$9F,$BF,$FF
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