;=========================================== ; hgr draw sprite (only at 14-bit boundaries) ;=========================================== ; can handle sprites bigger than a 256 byte page ; flames are 8x142 or so ; SPRITE in INL/INH ; MASK in MASKL/MASKH ; Location at SPRITE_X SPRITE_Y ; xsize, ysize in first two bytes hgr_draw_sprite_big_mask: ; lda SPRITE_X ldy #0 lda (INL),Y ; load xsize clc adc SPRITE_X sta big_sprite_width_end_smc+1 ; self modify for end of line iny ; load ysize lda (INL),Y sta big_sprite_ysize_smc+1 ; self modify ; point smc to sprite lda INL ; 16-bit add sta big_sprite_smc1+1 lda INH sta big_sprite_smc1+2 ; point to mask lda MASKL sta big_sprite_mask_smc1+1 lda MASKH sta big_sprite_mask_smc1+2 ldx #0 ; X is pointer offset stx CURRENT_ROW ; actual row ldx #2 hgr_big_sprite_yloop: lda CURRENT_ROW ; row clc adc SPRITE_Y ; add in cursor_y ; calc GBASL/GBASH tay ; get output ROW into GBASL/H lda hposn_low,Y sta GBASL lda hposn_high,Y clc adc DRAW_PAGE sta GBASH ldy SPRITE_X big_sprite_inner_loop: lda (GBASL),Y big_sprite_mask_smc1: and $f000,X big_sprite_smc1: ora $f000,X ; load sprite data sta (GBASL),Y ; store to screen inx ; increment sprite offset ; if > 1 page bne big_sprite_no_page_cross inc big_sprite_smc1+2 inc big_sprite_mask_smc1+2 big_sprite_no_page_cross: iny ; increment output position big_sprite_width_end_smc: cpy #6 ; see if reached end of row bne big_sprite_inner_loop ; if not, loop inc CURRENT_ROW ; row lda CURRENT_ROW ; row big_sprite_ysize_smc: cmp #31 ; see if at end bne hgr_big_sprite_yloop ; if not, loop rts