103 lines
2.1 KiB
ArmAsm
103 lines
2.1 KiB
ArmAsm
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;=============================================
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; put_sprite_one_color_no_transparent
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;=============================================
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; Sprite to display in INH,INL
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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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; This is a fast sprite with no transparency and assumes
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; only black/white sprite. Can change color by setting the
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; sprite_color_smc+1 value
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put_sprite:
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ldy #0 ; byte 0 is xsize ; 2
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lda (INL),Y ; 5
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sta CH ; xsize is in CH ; 3
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iny ; 2
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lda (INL),Y ; byte 1 is ysize ; 5
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sta CV ; ysize is in CV ; 3
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iny ; 2
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ldx YPOS ; make a copy of ypos ; 3
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;===========
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; 25
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put_sprite_loop:
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stx put_sprite_loop_smc+1 ; as we modify it ; 4
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lda gr_offsets,X ; lookup low-res memory address ; 4
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clc ; 2
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adc XPOS ; add in xpos ; 3
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sta OUTL ; store out low byte of addy ; 3
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lda gr_offsets+1,X ; look up high byte ; 4
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adc DRAW_PAGE ; ; 3
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sta OUTH ; and store it out ; 3
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; OUTH:OUTL now points at right place
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ldx CH ; load xsize into x ; 3
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;===========
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; 28
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put_sprite_pixel:
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lda (INL),Y ; get sprite colors ; 5
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iny ; increment sprite pointer ; 2
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sty put_sprite_pixel_smc+1 ; save sprite pointer ; 4
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sprite_color_smc:
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and #$ff
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; cmp #$00
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; beq sprite_output
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; cmp #$ff
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; bne not_ff
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;sprite_color_ff_smc:
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; lda #$ff
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; jmp sprite_output
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;not_ff:
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; cmp #$f0
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; bne not_f0
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;sprite_color_f0_smc:
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; lda #$f0
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; jmp sprite_output
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;not_f0:
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;sprite_color_0f_smc:
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; lda #$0f
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;sprite_output:
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ldy #$0 ; 2
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sta (OUTL),Y ; and write it out ; 6
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;============
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; 9
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put_sprite_done_draw:
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put_sprite_pixel_smc:
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ldy #$d1 ; restore sprite pointer ; 2
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inc OUTL ; increment output pointer ; 5
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dex ; decrement x counter ; 2
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bne put_sprite_pixel ; if not done, keep looping ; 2nt/3
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;==============
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; 12/13
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put_sprite_loop_smc:
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ldx #$d1 ; 2
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inx ; each line has two y vars ; 2
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inx ; 2
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dec CV ; decemenet total y count ; 5
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bne put_sprite_loop ; loop if not done ; 2nt/3
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;==============
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; 14/15
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rts ; return ; 6
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