134 lines
2.3 KiB
ArmAsm
134 lines
2.3 KiB
ArmAsm
;=============================
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; decently fast hlin routines
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;=============================
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; can also be used to print repeated text if desperate
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;================================
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; hlin_double:
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;================================
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; HLIN Y, V2 AT A
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; color in COLOR
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; GBASL/GBASH set to proper address
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; A, Y trashed
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; at end Y points to end of line
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hlin_double:
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inc V2 ; drawing inclusive
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sty TEMPY ; 3
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and #$fe ; make even ; 2
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tay ; y=A ; 2
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lda gr_offsets,Y ; lookup low-res memory address ; 4
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sta GBASL ; 3
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clc ; 2
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lda gr_offsets+1,Y ; 4
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta GBASH ; 3
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;===========
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; 26
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lda COLOR ; 3
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ldy TEMPY ; restore ; 3
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hlin_double_loop:
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sta (GBASL),Y ; 6
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iny ; 2
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cpy V2 ; 3
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bne hlin_double_loop ; 2nt/3
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rts ; 6
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;=================================
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; hlin_double_continue: width
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;=================================
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; GBASL has correct offset for row/col
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; V2=start, width in X
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; A, X, Y trashed
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; V2=xcoord at end
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hlin_double_continue:
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txa
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clc
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adc V2
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sta V2
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lda COLOR ; 3
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hlin_double_continue_loop:
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sta (GBASL),Y ; 6
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iny ; 2
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cpy V2
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bne hlin_double_continue_loop ; 2nt/3
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rts ; 6
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;=============
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;================================
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; hlin_single:
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;================================
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; HLIN Y, V2 AT A
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; color in COLOR
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; GBASL/GBASH set to proper address
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; A, Y trashed
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; at end Y points to end of line
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; Y, X, A trashed
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hlin_single:
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inc V2 ; drawing inclusive
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sty TEMPY ; 3
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and #$fe ; make even ; 2
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php ; save if zero ; 2
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tay ; y=A ; 2
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lda gr_offsets,Y ; lookup low-res memory address ; 4
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sta GBASL ; 3
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clc ; 2
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lda gr_offsets+1,Y ; 4
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta GBASH ; 3
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;===========
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; 28
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plp ; restore if 0
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beq hlin_single_bottom
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hlin_single_top:
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lda COLOR
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and #$f0
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sta COLOR
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ldy TEMPY
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hlin_single_top_loop:
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lda (GBASL),Y
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and #$0f
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ora COLOR
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sta (GBASL),Y
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iny
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cpy V2
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bne hlin_single_top_loop
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rts
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hlin_single_bottom:
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lda COLOR
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and #$0f
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sta COLOR
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ldy TEMPY
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hlin_single_bottom_loop:
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lda (GBASL),Y
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and #$f0
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sta (GBASL),Y
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iny
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cpy V2
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bne hlin_single_bottom_loop
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rts
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