479 lines
11 KiB
ArmAsm
479 lines
11 KiB
ArmAsm
; Draw a sprite directly to the graphics screen. No clipping / bounds checking is performed
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;
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; X = sprite record index
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_DrawStampToScreen
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clc
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lda _Sprites+SPRITE_Y,x
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adc ScreenY0
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asl
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asl
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asl
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asl
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asl
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sta tmp0
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asl
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asl
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clc
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adc tmp0
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clc
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adc #$2000
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clc
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adc ScreenX0
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adc _Sprites+SPRITE_X,x ; Move to the horizontal address
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tay ; This is the on-screen address
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lda _Sprites+SPRITE_HEIGHT,x
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sta tmp0
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; Sprite is either 8 or 16 pixels wide, so select the entry point
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lda _Sprites+SPRITE_WIDTH,x
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cmp #4
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beq :skinny
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lda _Sprites+SPRITE_DISP,x ; This is the VBUFF address with the correct sprite frame
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tax
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phb
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pea $0101
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plb
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plb
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bra :entry16
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:loop16
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clc
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txa
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adc #SPRITE_PLANE_SPAN
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tax
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tya
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adc #SHR_LINE_WIDTH
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tay
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:entry16
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lda: 6,y
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andl spritemask+6,x
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oral spritedata+6,x
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sta: 6,y
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lda: 4,y
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andl spritemask+4,x
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oral spritedata+4,x
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sta: 4,y
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lda: 2,y
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andl spritemask+2,x
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oral spritedata+2,x
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sta: 2,y
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lda: 0,y
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andl spritemask+0,x
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oral spritedata+0,x
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sta: 0,y
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dec tmp0
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bne :loop16
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plb
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rts
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:skinny
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lda _Sprites+SPRITE_DISP,x ; This is the VBUFF address with the correct sprite frame
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tax
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phb
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pea $0101
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plb
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plb
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bra :entry8
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:loop8
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clc
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txa
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adc #SPRITE_PLANE_SPAN
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tax
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tya
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adc #SHR_LINE_WIDTH
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tay
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:entry8
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lda: 2,y
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andl spritemask+2,x
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oral spritedata+2,x
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sta: 2,y
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lda: 0,y
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andl spritemask+0,x
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oral spritedata+0,x
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sta: 0,y
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dec tmp0
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bne :loop8
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plb
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rts
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; Alternate entry point that takes arguments in registers instead of using a _Sprite
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; record
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;
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; Y = VBUFF address
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; X = Tile Data address
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; A = Sprite Flags
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DISP_VFLIP equ $0004 ; hard code these because they are internal values
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DISP_HFLIP equ $0002
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DISP_MASK equ $0018 ; Preserve the size bits
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_DrawSpriteStamp
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sty tmp1
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stx tmp2
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xba
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and #DISP_MASK ; dispatch to all of the different orientations
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sta tmp3
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phb
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pea #^tiledata ; Set the bank to the tile data
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plb
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; X = sprite ID
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; Y = Tile Data
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; A = VBUFF address
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ldx tmp3
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ldy tmp2
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lda tmp1
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jsr _DrawSprite
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lda tmp3
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ora #DISP_HFLIP
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tax
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ldy tmp2
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lda tmp1
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clc
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adc #3*4
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jsr _DrawSprite
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lda tmp3
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ora #DISP_VFLIP
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tax
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ldy tmp2
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lda tmp1
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clc
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adc #6*4
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jsr _DrawSprite
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lda tmp3
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ora #DISP_HFLIP+DISP_VFLIP
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tax
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ldy tmp2
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lda tmp1
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clc
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adc #9*4
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jsr _DrawSprite
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; Restore bank
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plb ; pop extra byte
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plb
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rts
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;
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; X = _Sprites array offset
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_DrawSprite
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jmp (draw_sprite,x)
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draw_sprite dw draw_8x8,draw_8x8h,draw_8x8v,draw_8x8hv ; 8 wide x 8 tall
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dw draw_8x16,draw_8x16h,draw_8x16v,draw_8x16hv ; 8 wide x 16 tall
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dw draw_16x8,draw_16x8h,draw_16x8v,draw_16x8hv ; 16 wide by 8 tall
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dw draw_16x16,draw_16x16h,draw_16x16v,draw_16x16hv ; 16 wide by 16 tall
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dw :rtn,:rtn,:rtn,:rtn ; hidden bit is set
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dw :rtn,:rtn,:rtn,:rtn
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dw :rtn,:rtn,:rtn,:rtn
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dw :rtn,:rtn,:rtn,:rtn
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:rtn rts
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draw_8x8
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tax
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jmp _DrawTile8x8
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draw_8x8h
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tax
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clc
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tya
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adc #64
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tay
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jmp _DrawTile8x8
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draw_8x8v
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tax
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jmp _DrawTile8x8V
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draw_8x8hv
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tax
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clc
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tya
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adc #64
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tay
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jmp _DrawTile8x8V
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draw_8x16
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tax
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jsr _DrawTile8x8
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clc
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txa
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adc #{8*SPRITE_PLANE_SPAN}
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tax
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tya
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adc #{128*32} ; 32 tiles to the next vertical one, each tile is 128 bytes
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tay
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jmp _DrawTile8x8
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draw_8x16h
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tax
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clc
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tya
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adc #64
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tay
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jsr _DrawTile8x8
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clc
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txa
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adc #{8*SPRITE_PLANE_SPAN}
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tax
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tya
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adc #{128*32} ; 32 tiles to the next vertical one, each tile is 128 bytes
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tay
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jmp _DrawTile8x8
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draw_8x16v
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clc
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tax
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tya
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pha
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adc #{128*32}
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tay
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jsr _DrawTile8x8V
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clc
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txa
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adc #{8*SPRITE_PLANE_SPAN}
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tax
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ply
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jmp _DrawTile8x8V
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draw_8x16hv
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clc
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tax
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tya
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adc #64
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pha
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adc #{128*32}
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tay
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jsr _DrawTile8x8V
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clc
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txa
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adc #{8*SPRITE_PLANE_SPAN}
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tax
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ply
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jmp _DrawTile8x8V
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draw_16x8
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tax
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jsr _DrawTile8x8
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clc
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txa
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adc #4
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tax
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tya
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adc #128 ; Next tile is 128 bytes away
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tay
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jmp _DrawTile8x8
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draw_16x8h
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clc
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tax
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tya
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adc #64
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pha
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adc #128
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tay
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jsr _DrawTile8x8
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txa
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adc #4
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tax
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ply
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jmp _DrawTile8x8
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draw_16x8v
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tax
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jsr _DrawTile8x8V
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clc
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txa
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adc #4
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tax
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tya
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adc #128
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tay
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jmp _DrawTile8x8V
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draw_16x8hv
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clc
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tax
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tya
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adc #64
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pha
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adc #128
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tay
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jsr _DrawTile8x8V
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txa
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adc #4
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tax
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ply
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jmp _DrawTile8x8V
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; X = sprite ID
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; Y = Tile Data
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; A = VBUFF address
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draw_16x16
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clc
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tax
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jsr _DrawTile8x8
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txa
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adc #4
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tax
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tya
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adc #128
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tay
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jsr _DrawTile8x8
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txa
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adc #{8*SPRITE_PLANE_SPAN}-4
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tax
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tya
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adc #{128*{32-1}}
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tay
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jsr _DrawTile8x8
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txa
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adc #4
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tax
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tya
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adc #128
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tay
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jmp _DrawTile8x8
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draw_16x16h
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clc
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tax
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tya
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adc #64
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pha
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adc #128
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tay
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jsr _DrawTile8x8
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txa
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adc #4
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tax
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ply
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jsr _DrawTile8x8
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txa
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adc #{8*SPRITE_PLANE_SPAN}-4
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tax
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tya
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adc #{128*32}
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pha
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adc #128
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tay
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jsr _DrawTile8x8
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txa
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adc #4
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tax
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ply
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jmp _DrawTile8x8
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draw_16x16v
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clc
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tax
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tya
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pha ; store some copies
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phx
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pha
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adc #{128*32}
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tay
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jsr _DrawTile8x8V
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txa
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adc #{8*SPRITE_PLANE_SPAN}
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tax
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ply
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jsr _DrawTile8x8V
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pla
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adc #4
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tax
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lda 1,s
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adc #{128*{32+1}}
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tay
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jsr _DrawTile8x8V
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txa
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adc #{8*SPRITE_PLANE_SPAN}
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tax
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pla
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adc #128
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tay
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jmp _DrawTile8x8V
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draw_16x16hv
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clc
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tax
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tya
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pha
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adc #{128*{32+1}}+64 ; Bottom-right source to top-left
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tay
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jsr _DrawTile8x8V
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txa
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adc #4
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tax
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lda 1,s
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adc #{128*32}+64
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tay
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jsr _DrawTile8x8V
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txa
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adc #{8*SPRITE_PLANE_SPAN}-4
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tax
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lda 1,s
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adc #128+64
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tay
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jsr _DrawTile8x8V
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txa
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adc #4
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tax
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pla
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adc #64
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tay
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jmp _DrawTile8x8V
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; X = sprite vbuff address
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; Y = tile data pointer
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_DrawTile8x8
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_CopyTile8x8
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]line equ 0
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lup 8
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lda: tiledata+32+{]line*4},y
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stal spritemask+{]line*SPRITE_PLANE_SPAN},x
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lda: tiledata+{]line*4},y
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stal spritedata+{]line*SPRITE_PLANE_SPAN},x
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lda: tiledata+32+{]line*4}+2,y
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stal spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
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lda: tiledata+{]line*4}+2,y
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stal spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
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]line equ ]line+1
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--^
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rts
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_DrawTile8x8V
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_CopyTile8x8V
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]line equ 0
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lup 8
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lda: tiledata+32+{{7-]line}*4},y
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stal spritemask+{]line*SPRITE_PLANE_SPAN},x
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lda: tiledata+{{7-]line}*4},y
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stal spritedata+{]line*SPRITE_PLANE_SPAN},x
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lda: tiledata+32+{{7-]line}*4}+2,y
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stal spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
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lda: tiledata+{{7-]line}*4}+2,y
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stal spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
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]line equ ]line+1
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--^
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rts
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