87 lines
1.1 KiB
ArmAsm
87 lines
1.1 KiB
ArmAsm
;====================
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; gr_put_sprite_mask
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;====================
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; Sprite to display in INL/INH
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; MASK (for transparency) on MASKL/MASH
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; Location is XPOS,YPOS
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; Note, only works if YPOS is multiple of two
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; trashes A,X,Y
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gr_put_sprite_mask:
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ldy #0
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lda (INL),Y ; xsize
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clc
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adc XPOS
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sta gps_xmax_smc+1 ; store xmas (self-modify)
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iny ; 2
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lda (INL),Y ; ysize
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asl ; mul by 2
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clc
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adc YPOS
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sta gps_ymax_smc+1
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iny
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tya
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tax
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lda INL
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sta gps_src_smc+1
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lda INH
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sta gps_src_smc+2
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lda MASKL
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sta gps_mask_smc+1
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lda MASKH
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sta gps_mask_smc+2
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gr_put_sprite_loop:
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ldy YPOS
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lda gr_offsets,Y
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sta OUTL
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lda gr_offsets+1,Y
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clc
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adc DRAW_PAGE
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sta OUTH
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ldy XPOS
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gr_put_sprite_row:
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cpy #40
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bcs gr_put_sprite_dont_draw ; don't draw if out of bounds
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; put the pixel
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; based on monitor plot code
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lda (OUTL),Y
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gps_src_smc:
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eor $f000,X ; load sprite data
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gps_mask_smc:
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and $f000,X
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eor (OUTL),Y
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sta (OUTL),Y
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gr_put_sprite_dont_draw:
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iny
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inx
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gps_xmax_smc:
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cpy #40
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bne gr_put_sprite_row
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inc YPOS
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inc YPOS
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lda YPOS
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gps_ymax_smc:
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cmp #40
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bne gr_put_sprite_loop
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gr_put_sprite_done:
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rts ; return ; 6
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