mode7: update a fast screen clear routine
This commit is contained in:
Vince Weaver
parent
6af4836f26
commit
6af85a9533
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@ -2,53 +2,6 @@
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;= ROUTINES
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;=====================================================================
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clear_screens:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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rts
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clear_screens_notext:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_top
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lda #$0
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jsr clear_bottom_a
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_top
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lda #$0
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jsr clear_bottom_a
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rts
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;================================
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; hlin_setup
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;================================
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@ -168,69 +121,3 @@ hlin_single_bottom_loop:
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rts
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;=============================
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; clear_top
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;=============================
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clear_top:
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lda #$00
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;=============================
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; clear_top_a
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;=============================
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clear_top_a:
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sta COLOR
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; HLIN Y, V2 AT A
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lda #39
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sta V2
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lda #0
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clear_top_loop:
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ldy #0
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pha
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jsr hlin_double
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pla
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clc
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adc #$2
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cmp #40
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bne clear_top_loop
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rts
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;=============================
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; clear_bottom
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;=============================
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clear_bottom:
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lda #$a0 ; NORMAL space
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clear_bottom_a:
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sta COLOR
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lda #40
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sta V2
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clear_bottom_loop:
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ldy #0
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pha
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jsr hlin_double
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pla
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clc
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adc #$2
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cmp #48
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bne clear_bottom_loop
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rts
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; move these to zero page for slight speed increase?
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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@ -0,0 +1,5 @@
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; move these to zero page for slight speed increase?
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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@ -0,0 +1,115 @@
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;=====================================================================
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;= ROUTINES
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;=====================================================================
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clear_screens:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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rts
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clear_screens_notext:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_top
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lda #$0
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jsr clear_bottom_a
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_top
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lda #$0
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jsr clear_bottom_a
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rts
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;=============================
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; clear_top
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;=============================
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; takes 2+10+ (24+703 )*20 +6
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; 14,558 cycles(?) 15ms, 70Hz
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clear_top:
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lda #$00 ; 2
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;=============================
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; clear_top_a
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;=============================
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clear_top_a:
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sta COLOR ; 3
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; HLIN Y, V2 AT A
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lda #39 ; 2
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sta V2 ; 3
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lda #0 ; 2
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clear_top_loop:
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ldy #0 ; 2
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pha ; 3
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jsr hlin_double ; 6+
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pla ; 4
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clc ; 2
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adc #$2 ; 2
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cmp #40 ; 2
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bne clear_top_loop ; 2nt/3
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rts ; 6
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;=============================
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; clear_bottom
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;=============================
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clear_bottom:
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lda #$a0 ; NORMAL space
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clear_bottom_a:
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sta COLOR
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lda #40
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sta V2
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clear_bottom_loop:
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ldy #0
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pha
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jsr hlin_double
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pla
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clc
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adc #$2
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cmp #48
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bne clear_bottom_loop
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rts
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@ -27,8 +27,9 @@ MODE7_ISLAND: mode7_island.o
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mode7_island.o: mode7.s island_lookup.s island_map.inc \
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zp.inc sprites.inc \
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../asm_routines/gr_hlin.s \
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../asm_routines/multiply_fast.s \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/gr_fast_clear.s \
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../asm_routines/pageflip.s \
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../asm_routines/gr_setpage.s \
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../asm_routines/keypress.s \
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@ -41,8 +42,9 @@ MODE7_CHECKERBOARD: mode7_checkerboard.o
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mode7_checkerboard.o: mode7.s checkerboard_lookup.s \
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zp.inc sprites.inc \
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../asm_routines/gr_hlin.s \
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../asm_routines/multiply_fast.s \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/gr_fast_clear.s \
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../asm_routines/pageflip.s \
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../asm_routines/gr_setpage.s \
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../asm_routines/keypress.s \
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@ -58,7 +60,8 @@ MODE7_RAINBOW: mode7_rainbow.o
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mode7_rainbow.o: mode7.s rainbow_lookup.s \
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zp.inc sprites.inc \
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../asm_routines/multiply_fast.s \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/gr_fast_clear.s \
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../asm_routines/gr_hlin.s \
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../asm_routines/pageflip.s \
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../asm_routines/gr_setpage.s \
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../asm_routines/keypress.s \
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@ -71,7 +74,8 @@ SCROLL_DEMO: scroll_demo.o
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scroll_demo.o: scroll_demo.s \
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deater_scroll.inc \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/gr_hlin.s \
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../asm_routines/gr_fast_clear.s \
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../asm_routines/gr_scroll.s \
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../asm_routines/pageflip.s \
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../asm_routines/gr_setpage.s
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@ -82,7 +86,8 @@ SKY_DEMO: sky_demo.o
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sky_demo.o: sky_demo.s \
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starry_sky.scroll \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/gr_hlin.s \
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../asm_routines/gr_fast_clear.s \
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../asm_routines/gr_scroll.s \
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../asm_routines/pageflip.s \
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../asm_routines/gr_setpage.s
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@ -92,10 +97,10 @@ STARFIELD_DEMO: starfield_demo.o
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ld65 -o STARFIELD_DEMO starfield_demo.o -C ./apple2_1000.inc
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starfield_demo.o: starfield_demo.s \
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../asm_routines/hlin_clearscreen.s \
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../asm_routines/gr_scroll.s \
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../asm_routines/pageflip.s \
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../asm_routines/gr_setpage.s
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../asm_routines/gr_setpage.s \
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../asm_routines/gr_fast_clear.s
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ca65 -o starfield_demo.o starfield_demo.s -l starfield_demo.lst
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scroller: scroller.o
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@ -1114,12 +1114,14 @@ exit:
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; External modules
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;===============================================
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.include "../asm_routines/hlin_clearscreen.s"
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.include "../asm_routines/gr_hlin.s"
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.include "../asm_routines/pageflip.s"
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.include "../asm_routines/gr_setpage.s"
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.include "../asm_routines/keypress.s"
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.include "../asm_routines/gr_putsprite.s"
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.include "../asm_routines/text_print.s"
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.include "../asm_routines/gr_offsets.s"
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.include "../asm_routines/gr_fast_clear.s"
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.if .def(CHECKERBOARD_MAP)
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.include "../asm_routines/gr_scroll.s"
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@ -36,10 +36,11 @@ scroll_forever:
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;===============================================
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; Routines
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;===============================================
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.include "../asm_routines/hlin_clearscreen.s"
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.include "../asm_routines/gr_fast_clear.s"
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.include "../asm_routines/gr_scroll.s"
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.include "../asm_routines/pageflip.s"
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.include "../asm_routines/gr_setpage.s"
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.include "../asm_routines/gr_offsets.s"
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;===============================================
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; Variables
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@ -51,12 +51,13 @@ scroll_forever:
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;===============================================
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; Routines
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;===============================================
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.include "../asm_routines/hlin_clearscreen.s"
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.include "../asm_routines/gr_fast_clear.s"
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.include "../asm_routines/gr_scroll.s"
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.include "../asm_routines/pageflip.s"
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.include "../asm_routines/gr_setpage.s"
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.include "../asm_routines/keypress.s"
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.include "../asm_routines/bg_scroll.s"
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.include "../asm_routines/gr_offsets.s"
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;===============================================
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; Variables
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@ -25,15 +25,15 @@ NUMSTARS EQU 16
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;===============
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; Init Variables
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;===============
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lda #0
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sta DRAW_PAGE
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sta RANDOM_POINTER
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lda #0 ; 2
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sta DRAW_PAGE ; 3
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sta RANDOM_POINTER ; 3
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ldy #(NUMSTARS-1)
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ldy #(NUMSTARS-1) ; 2
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init_stars:
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jsr random_star
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dey
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bpl init_stars
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jsr random_star ; 6
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dey ; 2
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bpl init_stars ; 2nt/3
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;===========================
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;===========================
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@ -46,8 +46,8 @@ starfield_loop:
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;===============
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; clear screen
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;===============
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jsr clear_top
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jsr clear_top ; 6+
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; 6047
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;===============
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; draw stars
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;===============
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@ -312,12 +312,14 @@ random_star:
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; External modules
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;===============================================
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.include "../asm_routines/hlin_clearscreen.s"
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;.include "../asm_routines/hlin_clearscreen.s"
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.include "../asm_routines/pageflip.s"
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.include "../asm_routines/gr_setpage.s"
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.include "../asm_routines/keypress.s"
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.include "../asm_routines/gr_putsprite.s"
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.include "../asm_routines/text_print.s"
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.include "../asm_routines/gr_offsets.s"
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.include "../asm_routines/gr_fast_clear.s"
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;===============================================
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; Variables
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