374 lines
5.1 KiB
ArmAsm
374 lines
5.1 KiB
ArmAsm
;===========================================
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; hgr draw sprite (only at 7-bit boundaries)
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;===========================================
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; SPRITE in INL/INH
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; Location at XPOS YPOS
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; xsize, ysize in first two bytes
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; sprite AT INL/INH
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hgr_draw_sprite:
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ldy #0
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lda (INL),Y ; load xsize
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clc
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adc XPOS
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sta sprite_width_end_smc+1 ; self modify for end of line
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iny ; load ysize
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lda (INL),Y
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sta sprite_ysize_smc+1 ; self modify
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; skip the xsize/ysize and point to sprite
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clc
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lda INL ; 16-bit add
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adc #2
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sta sprite_smc1+1
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lda INH
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adc #0
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sta sprite_smc1+2
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ldx #0 ; X is pointer offset
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stx MASK ; actual row
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hgr_sprite_yloop:
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lda MASK ; row
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clc
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adc YPOS ; add in cursor_y
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; calc GBASL/GBASH
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tay ; get output ROW into GBASL/H
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lda hposn_low,Y
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sta GBASL
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lda hposn_high,Y
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; eor #$00 draws on page2
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; eor #$60 draws on page1
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hgr_sprite_page_smc:
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eor #$00
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sta GBASH
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ldy XPOS
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sprite_inner_loop:
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sprite_smc1:
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lda $d000 ; get sprite pattern
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sta (GBASL),Y ; store out
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inx
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iny
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inc sprite_smc1+1
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bne sprite_noflo
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inc sprite_smc1+2
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sprite_noflo:
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sprite_width_end_smc:
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cpy #6
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bne sprite_inner_loop
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inc MASK ; row
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lda MASK ; row
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sprite_ysize_smc:
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cmp #31
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bne hgr_sprite_yloop
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rts
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hgr_sprite_page_toggle:
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lda hgr_sprite_page_smc+1
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eor #$60
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sta hgr_sprite_page_smc+1
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rts
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;===========================================
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; hgr draw sprite (only at 7-bit boundaries)
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;===========================================
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; autoshift version
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; assumes sprite is drawn for even column
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; and shifts it if in odd column
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; SPRITE in INL/INH
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; Location at XPOS YPOS
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; xsize, ysize in first two bytes
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; sprite AT INL/INH
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hgr_draw_sprite_autoshift:
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; self modify to shift for odd start location
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; SEC=$38 0b0011 1000 CLC=$18 0b0001 10000
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lda XPOS
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lsr
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bcc make_it_even
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make_it_odd:
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lda #$18
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bne make_it_so
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make_it_even:
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lda #$38
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make_it_so:
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sta odd_even_smc
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ldy #0
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lda (INL),Y ; load xsize
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clc
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adc XPOS
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sta sprite_width_end_smc_as+1 ; self modify for end of line
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iny ; load ysize
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lda (INL),Y
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sta sprite_ysize_smc_as+1 ; self modify
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; skip the xsize/ysize and point to sprite
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clc
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lda INL ; 16-bit add
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adc #2
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sta sprite_smc1_as+1
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lda INH
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adc #0
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sta sprite_smc1_as+2
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ldx #0 ; X is pointer offset
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stx MASK ; actual row
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hgr_sprite_yloop_as:
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lda MASK ; row
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clc
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adc YPOS ; add in cursor_y
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; calc GBASL/GBASH
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tay ; get output ROW into GBASL/H
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lda hposn_low,Y
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sta GBASL
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lda hposn_high,Y
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; eor #$00 draws on page2
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; eor #$60 draws on page1
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hgr_sprite_smc_as:
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eor #$00
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sta GBASH
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ldy XPOS
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sprite_inner_loop_as:
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sprite_smc1_as:
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lda $d000 ; get sprite pattern
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; lsr
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odd_even_smc:
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sec
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bcs no_adjust
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asl
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php
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clc
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lsr
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plp
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ror
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no_adjust:
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;? Xcababab
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;X cababab?
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;? X0cababa
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; clc ; rol asl
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; rol
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sta (GBASL),Y ; store out
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inx
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iny
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inc sprite_smc1_as+1
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bne sprite_noflo_as
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inc sprite_smc1_as+2
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sprite_noflo_as:
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sprite_width_end_smc_as:
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cpy #6
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bne sprite_inner_loop_as
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inc MASK ; row
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lda MASK ; row
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sprite_ysize_smc_as:
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cmp #31
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bne hgr_sprite_yloop_as
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rts
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hgr_sprite_as_toggle:
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lda hgr_sprite_smc_as+1
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eor #$60
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sta hgr_sprite_smc_as+1
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rts
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;===========================================
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; hgr draw sprite (only at 7-bit boundaries)
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;===========================================
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; autoshift version
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; assumes sprite is drawn for even column
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; and shifts it if in odd column
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; ors with bg for lemming
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; SPRITE in INL/INH
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; Location at XPOS YPOS
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; xsize, ysize in first two bytes
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; sprite AT INL/INH
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hgr_draw_sprite_or_autoshift:
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; self modify to shift for odd start location
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; SEC=$38 0b0011 1000 CLC=$18 0b0001 10000
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lda XPOS
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lsr
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bcc make_it_even_or
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make_it_odd_or:
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lda #$18
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bne make_it_so_or
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make_it_even_or:
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lda #$38
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make_it_so_or:
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sta odd_even_smc_or
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ldy #0
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lda (INL),Y ; load xsize
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clc
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adc XPOS
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sta sprite_width_end_smc_as_or+1 ; self modify for end of line
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iny ; load ysize
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lda (INL),Y
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sta sprite_ysize_smc_as_or+1 ; self modify
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; skip the xsize/ysize and point to sprite
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clc
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lda INL ; 16-bit add
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adc #2
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sta sprite_smc1_as_or+1
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lda INH
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adc #0
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sta sprite_smc1_as_or+2
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ldx #0 ; X is pointer offset
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stx MASK ; actual row
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hgr_sprite_yloop_as_or:
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lda MASK ; row
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clc
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adc YPOS ; add in cursor_y
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; calc GBASL/GBASH
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tay ; get output ROW into GBASL/H
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lda hposn_low,Y
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sta GBASL
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lda hposn_high,Y
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; eor #$00 draws on page2
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; eor #$60 draws on page1
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hgr_sprite_smc_as_or:
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eor #$00
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sta GBASH
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ldy XPOS
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sprite_inner_loop_as_or:
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sprite_smc1_as_or:
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lda $d000 ; get sprite pattern
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; lsr
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odd_even_smc_or:
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sec
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bcs no_adjust_or
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asl
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php
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clc
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lsr
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plp
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ror
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no_adjust_or:
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;? Xcababab
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;X cababab?
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;? X0cababa
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; clc ; rol asl
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; rol
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ora (GBASL),Y
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sta (GBASL),Y ; store out
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inx
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iny
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inc sprite_smc1_as_or+1
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bne sprite_noflo_as_or
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inc sprite_smc1_as_or+2
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sprite_noflo_as_or:
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sprite_width_end_smc_as_or:
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cpy #6
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bne sprite_inner_loop_as_or
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inc MASK ; row
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lda MASK ; row
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sprite_ysize_smc_as_or:
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cmp #31
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bne hgr_sprite_yloop_as_or
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rts
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hgr_sprite_as_or_toggle:
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lda hgr_sprite_smc_as_or+1
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eor #$60
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sta hgr_sprite_smc_as_or+1
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rts
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